CN114279861A - Automatic mechanical property testing system for superconducting conductor and implementation method thereof - Google Patents
Automatic mechanical property testing system for superconducting conductor and implementation method thereof Download PDFInfo
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- CN114279861A CN114279861A CN202111634236.7A CN202111634236A CN114279861A CN 114279861 A CN114279861 A CN 114279861A CN 202111634236 A CN202111634236 A CN 202111634236A CN 114279861 A CN114279861 A CN 114279861A
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Abstract
The invention provides an automatic testing system and an implementation method for mechanical properties of a superconducting conductor. The test system mainly comprises: the device comprises an upper computer, a compact RIO embedded control host and auxiliary board cards thereof, a mechanical testing machine, a pressure sensor, a low-temperature extensometer, a liquid nitrogen sensor, an electromagnetic valve, a liquid level controller, a temperature controller, a heating resistor, a heating disc, a temperature sensor, a power supply, a liquid nitrogen Dewar, a tested sample and the like. The automatic mechanical property testing system for the superconducting conductor has the characteristics of high integration level, stable performance, accurate detection and the like, can realize high-precision, real-time and efficient acquisition of displacement and pressure, can configure sampling frequency, and can establish corresponding acquisition rate aiming at pressure circulation in different periods.
Description
Technical Field
The invention relates to the field of superconducting conductor performance testing, in particular to an automatic testing system for mechanical performance of a superconducting conductor.
Background
With the continuous decrease of traditional fossil energy, various countries in the world develop exploration of new generation energy, and the new energy generated by nuclear fusion is widely concerned as a clean and efficient energy. The superconducting magnet system is a core component of a nuclear fusion device and comprises a TF coil, a CS coil, a PF coil and a CC coil, wherein each coil is made of a superconducting conductor. During operation, the conductor generally works under the complex environment conditions of strong magnetic field, extremely low temperature and large current, so that the performance of the conductor needs to be detected after the design and development of the conductor are completed, and the critical performance of the conductor needs to be evaluated under the environment of simulated working conditions.
The mechanical property test of the superconducting conductor is a research for simulating the decay change of the conductor performance caused by the electromagnetic force strain and the thermal strain of a fusion reactor magnet under the operating condition. The experiment needs the superconducting conductor to carry out the cycle test of mechanical property under the low temperature region, has characteristics such as duration is long, data bulk is big, and traditional collection test system only gathers relevant signal, does not possess characteristics such as analysis, processing, and can't establish connection control with the instrument, consumes a large amount of manpowers in the experimentation and the later stage data processing. The superconducting conductor low-temperature mechanical performance measurement and control system has the functions of data online processing, real-time display, instrument control and the like, a user can realize the functions of testing, acquisition, control, analysis, processing and the like only by simply setting, the automation of the testing process can be realized in the experimental process, the heavy data processing task in the later period of personnel can be reduced, and the superconducting conductor low-temperature mechanical performance measurement and control system has the characteristics of high efficiency, rapidness, convenience and the like.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide an automatic mechanical property testing system for a superconducting conductor and an implementation method thereof.
The automatic mechanical property testing system for the superconducting conductor comprises a software part and a hardware part, wherein the hardware part comprises a pressure control unit, a heating control unit, a liquid level control unit, a displacement measurement unit and an acquisition control unit; the software part consists of an FPGA acquisition program, an RT data processing program and an upper computer control program;
the pressure control unit comprises a mechanical testing machine, a pressure sensor and a partial pressure module; the pressure sensor is arranged on a pressure transmission column of the mechanical testing machine and used for detecting the pressure applied by the mechanical testing machine; the pressure transmission column comprises an upper transmission column and a lower transmission column; the pressure dividing module is connected with the pressure sensor and is used for dividing the pressure of the pressure transmission column on the sample;
the heating control unit comprises a heating resistor, a heating plate, a temperature sensor and a temperature monitor, wherein the heating plate is provided with an upper heating plate layer and a lower heating plate layer, the lower heating plate is provided with a groove, the heating resistor is embedded into the groove of the lower heating plate and used for generating heat, the upper heating plate is arranged between an upper transmission column and a voltage division module of the mechanical testing machine, the lower heating plate is arranged on a lower transmission column of the mechanical testing machine and positioned above the pressure sensor, the temperature sensor is arranged in the heating plate and used for detecting the temperature of the heating plate, and the temperature monitor adjusts the temperature in real time according to a set value and keeps constant temperature;
the liquid level control unit comprises a low-temperature control valve, a liquid nitrogen sensor, a liquid level monitor and an electromagnetic valve controller; the low-temperature control valve controls the on-off of the liquid nitrogen input channel, the liquid level sensor is used for measuring the height of the liquid level of the liquid nitrogen, the liquid level monitor is used for displaying and detecting the real-time height of the liquid nitrogen and sending an on-off instruction to the electromagnetic valve controller, and the electromagnetic valve controller controls the on-off of the electromagnetic valve according to the instruction of the liquid level monitor;
the displacement measurement unit comprises a low-temperature extensometer and a voltage source, the low-temperature extensometer is mounted on the experimental armor and used for measuring displacement change of the experimental armor under pressure, and the voltage source provides stable voltage for the low-temperature extensometer and the pressure sensor;
the acquisition control unit comprises an upper computer, a compact RIO controller and an auxiliary acquisition board card;
the FPGA acquisition program is used for acquiring the application force and the experimental armor strain displacement of the mechanical experiment machine;
the RT data processing program is used for processing data acquired by the FPGA layer and processing pressure, cycle times, energy and displacement information;
the upper computer control program is a man-machine interaction program and an interaction program with the temperature controller and the liquid level controller, and is used for displaying displacement and pressure change, setting the adjusting range of temperature and liquid level and sending out related control instructions of an operator;
the FPGA acquisition program and the RT data processing program adopt an FIFO protocol for data transmission, and the RT data processing program and the upper computer control program adopt a network variable and a network flow protocol for data transmission.
Further, the temperature controller adopts RS485 communication protocol to establish connection with the compactRIO controller, and the liquid level controller adopts TCP/IP communication protocol to establish connection with the compactRIO controller.
Further, the heating control unit is used for heating the pressure sensor, and the pressure sensor is guaranteed to work within the temperature range of 15-30 ℃.
Furthermore, the heating resistor in the heating control unit is annular in appearance, the heating plate is in a hollow cylindrical shape, and the inner annular wall is threaded.
Furthermore, a gap between the heating resistor and the groove of the lower heating plate is filled with soldering tin, and the upper heating plate and the lower heating plate are sealed by welding.
Further, the liquid level control unit is used for regulating and controlling the height of the low-temperature liquid, when the liquid level is lower than a system set value, the electromagnetic valve is opened for liquid supplement, and when the liquid level is higher than the system set value, the liquid supplement is stopped; the liquid is ensured to be always in a low-temperature medium in the test process.
Furthermore, the low-temperature extensometer adopts a nilos type ultralow-temperature extensometer, 4 low-temperature strain gauges are installed on double-side bridge arms of the low-temperature extensometer, and strain change on the bridge arms is accurately measured at a temperature range of 4.2K-77K.
Further, the FPGA acquisition program and the RT data processing program run on a compact RIO controller, and the upper computer control program runs on a PC end; the FPGA end acquisition program supports shunt calibration and offset calibration of displacement and pressure measurement and adjustment of sampling frequency; the RT data processing program can distinguish the cycle times, automatically judge the most value of pressure displacement of each cycle and calculate the energy of each cycle; the data storage file of the RT data processing program is in a TDMS format, and the data is stored in an external storage container of the compactRIO controller.
Further, the RT data processing program includes an upper computer message transceiving process, an RT end message processing process, a data analysis processing process, a data storage process, and an FPGA end message transceiving process.
The invention also provides a method for realizing the automatic mechanical property testing system of the superconducting conductor, which comprises the following steps:
(1) assembling components of the test system;
a. placing a heating resistor in a groove of the lower heating plate, filling a gap with soldering tin, welding and sealing the upper heating plate and the lower heating plate, and connecting the heating resistor with a temperature monitor;
b. embedding the temperature sensor into the upper heating disc, and simultaneously connecting a signal wire of the temperature sensor into a temperature controller;
c. the liquid level sensor is placed in a measuring container, vertically placed and fixed by a bracket, and simultaneously connected with a liquid level monitor;
d. installing a low-temperature control valve at the output end of a low-temperature medium, and connecting a corresponding control signal line with a liquid level controller;
e. connecting the temperature monitor, the liquid level controller and the CompactRIO controller;
f. the low temperature extensometer is connected to an accessory module of the CompactRIO controller.
(2) Setting relevant parameters of an FPGA acquisition program, a temperature monitor, a liquid level monitor and a mechanical testing machine;
(3) starting a test, and collecting, analyzing and storing related data:
a. opening a test system acquisition page, acquiring signals and starting a data storage function;
b. starting a mechanical testing machine to start testing;
c. analyzing data of a test system, acquiring a pressure value and a displacement value of the current moment in real time by the test system, serializing, entering a maximum period distinguishing mode when the acquired pressure value is greater than 90% of a predicted pressure value for the first time, acquiring the maximum value from the current moment to the previous moment when the acquired pressure value is less than 90% of the predicted pressure value again, simultaneously recording a data serial number of the moment, indexing all pressure values of the serial number to an ending serial number of the previous moment, acquiring the minimum value and recording the serial number of the data, taking out the pressure value and the displacement value from the minimum serial number to the maximum serial number, outputting test data required by the cyclic loading, re-serializing next group of data, and outputting an analysis and processing result;
(4) and stopping collecting and storing after the experiment is finished, and exporting experimental data.
Has the advantages that:
(1) according to the automatic testing system for mechanical properties of the superconducting conductor, the compact RIO controller is connected with the low-temperature extensometer and the pressure sensor through the auxiliary board card, and shunt calibration and offset calibration programs are designed in an FPGA (field programmable gate array) acquisition program, so that high-precision, real-time and high-efficiency acquisition of displacement and pressure can be realized. Meanwhile, the sampling frequency can be configured, and corresponding acquisition rates can be established according to the pressure cycles of different periods.
(2) In the temperature control unit, the heating resistor is arranged in the heating plate and is arranged between the pressure sensor and the voltage dividing module, the temperature of the heating plate is kept through the temperature controller, cold conduction from the voltage dividing module soaked in a low-temperature medium can be isolated, and the pressure sensor is ensured to be at a normal working temperature.
(3) In the liquid level control unit, the electromagnetic valve controller and the liquid level monitor can independently form a closed loop, the upper computer applies liquid level height range information to the liquid level monitor, the liquid level control unit can work, the height change of the low-temperature medium in the container in the experimental process is adjusted, and the reliability of the experimental test environment is guaranteed.
(4) In the RT data processing program, the maximum value of the pressure of each circulation can be judged in real time according to the collected data, the circulation times in the process of multiple circulations are reasonably defined, and the energy value of each circulation is calculated and displayed on a user interface in real time, so that a user can conveniently observe the energy value in real time.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the structure of a pressure loading unit according to the present invention;
FIG. 2 is a heating plate of the heating control unit of the present invention; wherein, the left figure is a schematic diagram of the lower heating disc, and the right figure is a schematic diagram of the upper heating disc;
FIG. 3 is a diagram of the overall architecture of the automated test system of the present invention;
FIG. 4 is a diagram of the software architecture of the automated test system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides an automatic testing system for mechanical properties of a superconducting conductor and an implementation method thereof, which can simultaneously realize the functions of motion control of a plurality of linkage units of the system, high-precision strain displacement signal acquisition in a low-temperature environment and the like.
In order to monitor the strain state of the superconducting conductor under different pressures and further optimize the performance of the superconducting conductor, the strain displacement of the superconducting conductor under different pressure states is required to be measured. For the automatic mechanical property testing system for the superconducting conductor, a low-temperature extensometer can be added at the position of an outer armor of the superconducting conductor, and a proper bridge circuit is adopted to convert a strain signal into an electric signal for subsequent circuit processing and acquisition.
Referring to fig. 1, the automatic testing system for mechanical properties of superconducting conductors of the present invention is composed of a software part and a hardware part, wherein the hardware part includes a pressure control unit, a heating control unit, a liquid level control unit, a displacement measurement unit, and an acquisition control unit. The pressure control unit comprises a mechanical testing machine 1, an upper heating plate 2, a pressure dividing module 3, a spring corrugated pipe 4, a support rack 5, a lower heating plate 6 and a pressure sensor 7; the upper heating plate 2 is arranged on an upper transmission column of the mechanical testing machine, is positioned between the upper transmission column and the voltage division module 3, and is used for isolating cold conduction from a low-temperature medium and avoiding low temperature damage to an upper brake arm of the mechanical testing machine; the voltage dividing module 3 is arranged below the upper heating plate 2 and used for equally dividing pressure applied to the superconducting conductor and ensuring that all parts of the conductor are stressed uniformly; the spring corrugated pipe 4 (appearing in a front blue font) is used for sealing the tightness of the low-temperature container and reducing the loss of a low-temperature medium; the lower heating plate supporting rack 5 is used for providing support for the low-temperature container; the lower heating plate 6 is arranged on a lower transmission column of the mechanical testing machine and positioned on the upper side of the pressure sensor, and is used for isolating cold conduction from a low-temperature medium and avoiding low temperature damage to the pressure sensor 7; and the pressure sensor 7 is arranged below the lower heating plate 6 and used for measuring the pressure load of the mechanical testing machine.
Referring to fig. 2, the heating control unit includes a heating resistor 10, a heating plate, a temperature sensor 11, and a temperature monitor, and the heating plate has two layers, i.e., an upper heating plate 2 and a lower heating plate 6. Wherein, the inner side of the lower heating plate 6 is carved with a groove, the heating resistor 10 can be placed in the groove, and the gap between the heating resistor 10 and the groove is filled by adopting a hot soldering tin method. The inside drilling of upper heating plate 2 for place temperature sensor 11, temperature sensor 11 outside is wrapped up in heat conduction silicone grease, and the afterbody adopts resin seal, and temperature sensor 11 does not with heating resistor direct contact, does not with outside air direct contact. The upper heating plate 2 and the lower heating plate 6 are connected by welding for sealing. Lower heating plate 6 is installed on the lower drive column of mechanical testing machine 1, is located the pressure sensor upside, temperature sensor 11 places in the heating plate for detect the temperature of heating plate, the temperature is adjusted according to the setting value in real time to the temperature monitoring appearance, keeps constant temperature.
Referring to fig. 3, the liquid level control unit is composed of an electromagnetic valve, an electromagnetic valve controller, a liquid level monitor and a liquid level sensor, the liquid level sensor detects the height of the low-temperature medium to ensure that the superconducting conductor is immersed in the low-temperature medium, the liquid level monitor is used for displaying and detecting the real-time height of liquid nitrogen and receiving data sent by the main control system, and the electromagnetic valve controller is controlled in real time to adjust the on-off of the electromagnetic valve and timely supplement the consumption of the low-temperature medium at room temperature. The electromagnetic valve comprises a low-temperature control valve which controls the on-off of the liquid nitrogen input channel, the liquid level sensor is used for measuring the height of the liquid level of the liquid nitrogen, and the electromagnetic valve controller controls the on-off of the electromagnetic valve according to the instruction of the liquid level monitor.
The temperature control unit is composed of a temperature sensor, a temperature controller and a heating resistor, the temperature sensor detects the temperature of the heating plate and feeds the temperature back to the temperature monitor, the power of the heating resistor is adjusted by the temperature monitor, and the temperature of the heating plate is guaranteed to be kept within the temperature range of 15-30 ℃.
The displacement measuring unit consists of a compact RIO controller, NI9237 and a low-temperature extensometer. The low-temperature extensometer is used for detecting strain displacement signals, the NI9237 is used for collecting pressure signals and displacement signals, and the compactRIO controller is used for analyzing, processing, displaying, storing and the like of the signals. The NI9237 module attached to the compact RIO is used for collecting electric signals, meanwhile, the collected signals are subjected to shunt calibration and offset calibration in real time, and accurate measurement is rapidly performed on the strain displacement signals. Fig. 4 is a diagram showing a software architecture of the automated testing system for mechanical properties of superconducting conductors according to the present invention. The host PC mainly comprises a data display process and a parameter setting process and is used for displaying parameters such as pressure, displacement and the like and controlling a temperature monitor, a liquid level monitor and the like. The software part consists of an FPGA acquisition program, an RT data processing program and an upper computer control program. The acquisition control unit comprises an upper computer, a compact RIO controller and an auxiliary acquisition board card. The compactRIO controller comprises a real-time controller layer and an FPGA acquisition program; the real-time controller layer mainly realizes the transceiving of data. And processing data acquired by the lower computer on the layer, analyzing the maximum and minimum values of each pressure cycle in real time, and recording the corresponding strain displacement value. Meanwhile, the data storage process can store the analyzed result in real time. The FPGA acquisition program mainly realizes the cyclic acquisition of pressure signals and displacement signals, the sampling rate can be adjusted by self-definition and can reach 10KS/s at most, and meanwhile, the module supports a bridge circuit to carry out shunt calibration and offset calibration.
Preferably, the displacement measuring unit comprises a low temperature extensometer and a voltage source, the low temperature extensometer is installed on the experimental armor and is used for measuring displacement change of the experimental armor under pressure, and the voltage source provides stable voltage for the low temperature extensometer and the pressure sensor.
Preferably, the RT data processing program is configured to process data acquired by the FPGA acquisition program, and process pressure, cycle number, energy, and displacement information.
Preferably, the upper computer control program is a man-machine interaction program and an interaction program with a temperature controller and a liquid level controller, and is used for displaying displacement and pressure change, setting the adjusting range of temperature and liquid level and sending out related control instructions of an operator.
Preferably, the FPGA acquisition program and the RT data processing program perform data transmission using an FIFO protocol, and the RT data processing program and the upper computer control program perform data transmission using a network variable and a network stream protocol.
Preferably, the temperature controller is connected with the CompactRIO controller by adopting an RS485 communication protocol, and the liquid level controller is connected with the CompactRIO controller by adopting a TCP/IP communication protocol.
Preferably, the heating control unit is used for heating the pressure sensor to ensure that the pressure sensor works in a temperature range of 15-30 ℃.
Preferably, the heating resistor in the heating control unit is annular in appearance, the heating plate is in a hollow cylindrical shape, and the inner annular wall is threaded.
Preferably, the upper heating plate and the lower heating plate are sealed by welding.
Preferably, the liquid level control unit is used for regulating and controlling the height of the cryogenic liquid, when the liquid level is lower than a system set value, the electromagnetic valve is opened for liquid supplement, and when the liquid level is higher than the system set value, the liquid supplement is stopped; the liquid is ensured to be always in a low-temperature medium in the test process.
Preferably, the low-temperature extensometer adopts a nilos type ultralow-temperature extensometer, 4 low-temperature strain gauges are installed on double-side bridge arms of the low-temperature extensometer, and strain change on the bridge arms is accurately measured at a temperature range of 4.2K-77K.
Preferably, the FPGA acquisition program and the RT data processing program run on a CompactRIO controller, and the upper computer control program runs on a PC.
Preferably, the RT data processing program can distinguish the number of cycles, automatically determine the most value of pressure displacement for each cycle, and calculate the energy for each cycle.
Preferably, the data storage file of the RT data processing program is in a TDMS format, and the data is stored in an external storage container of the CompactRIO controller.
Preferably, the RT data processing program includes an upper computer message transceiving process, an RT end message processing process, a data analysis processing process, a data saving process, and an FPGA end message transceiving process.
The invention also provides a method for realizing the automatic testing system of the mechanical property of the superconducting conductor, which comprises the following steps:
(1) firstly, assembling components of a test system;
a. placing a heating resistor in a groove of the lower heating plate, filling a gap with soldering tin, welding and sealing the upper heating plate and the lower heating plate, and connecting the heating resistor with a temperature monitor;
b. embedding the temperature sensor into the upper heating disc, and simultaneously connecting a signal wire of the temperature sensor into a temperature controller;
c. the liquid level sensor is placed in a measuring container, vertically placed and fixed by a bracket, and simultaneously connected with a liquid level monitor;
d. installing a low-temperature control valve at the output end of a low-temperature medium, and connecting a corresponding control signal line with a liquid level controller;
e. connecting the temperature monitor, the liquid level controller and the CompactRIO controller;
f. the low temperature extensometer is connected to an accessory module of the CompactRIO controller.
(2) Then, setting relevant parameters of an FPGA acquisition program, a temperature monitor, a liquid level monitor and a mechanical testing machine;
a. setting parameters of sampling rate, whether offset calibration and whether shunt calibration of an FPGA acquisition program are carried out;
b. setting parameters of the temperature monitor, including a temperature value to be maintained and an allowable error range;
c. setting parameters of the liquid level monitor, including a liquid level height value to be maintained and an allowable error range;
d. setting parameters of the mechanical testing machine, and setting loading pressure, cycle times, pressure waveform and the like according to experimental needs;
(3) starting a test, and collecting, analyzing and storing related data;
a. opening a test system acquisition page, acquiring signals and starting a data storage function;
b. starting a mechanical testing machine to start testing;
c. in the data analysis of the test system, the system can acquire a pressure value and a displacement value at the current moment in real time and carry out serialization, when the acquired pressure value is greater than 90% of a predicted pressure value for the first time, the mode enters a maximum period distinguishing mode, when the acquired pressure value is smaller than 90% of the predicted pressure value again, the maximum value from the current moment to the previous moment is acquired, the data serial number at the moment is recorded at the same time, the pressure values of the serial number to the ending serial number at the previous moment are all indexed, the minimum value is acquired, the serial number of the data is recorded, the pressure value and the displacement value from the minimum serial number to the maximum serial number are taken out, the output is test data required by the cyclic loading, next group of data is re-serialized, and the analysis and processing result is output;
(4) and stopping collecting and storing after the experiment is finished, and exporting experimental data.
The invention provides an automatic mechanical property testing system for a superconducting conductor. The invention is provided according to the mechanical property measurement system of the superconducting conductor, but has certain expansibility and is suitable for a circulating acquisition control system.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (10)
1. An automatic mechanical property testing system for a superconducting conductor is characterized in that: the test system consists of a software part and a hardware part, wherein the hardware part comprises a pressure control unit, a heating control unit, a liquid level control unit, a displacement measurement unit and an acquisition control unit; the software part consists of an FPGA acquisition program, an RT data processing program and an upper computer control program;
the pressure control unit comprises a mechanical testing machine, a pressure sensor and a partial pressure module; the pressure sensor is arranged on a pressure transmission column of the mechanical testing machine and used for detecting the pressure applied by the mechanical testing machine; the pressure transmission column comprises an upper transmission column and a lower transmission column; the pressure dividing module is connected with the pressure sensor and is used for dividing the pressure of the pressure transmission column on the sample;
the heating control unit comprises a heating resistor, a heating plate, a temperature sensor and a temperature monitor, wherein the heating plate is provided with an upper heating plate layer and a lower heating plate layer, the lower heating plate is provided with a groove, the heating resistor is embedded into the groove of the lower heating plate and used for generating heat, the upper heating plate is arranged between an upper transmission column and a voltage division module of the mechanical testing machine, the lower heating plate is arranged on a lower transmission column of the mechanical testing machine and positioned above the pressure sensor, the temperature sensor is placed in the heating plate and used for detecting the temperature of the heating plate, and the temperature monitor adjusts the temperature in real time according to a set value and keeps constant temperature;
the liquid level control unit comprises a low-temperature control valve, a liquid nitrogen sensor, a liquid level monitor and an electromagnetic valve controller; the low-temperature control valve controls the on-off of the liquid nitrogen input channel, the liquid level sensor is used for measuring the height of the liquid level of the liquid nitrogen, the liquid level monitor is used for displaying and detecting the real-time height of the liquid nitrogen and sending an on-off instruction to the electromagnetic valve controller, and the electromagnetic valve controller controls the on-off of the electromagnetic valve according to the instruction of the liquid level monitor;
the displacement measurement unit comprises a low-temperature extensometer and a voltage source, the low-temperature extensometer is mounted on the experimental armor and used for measuring displacement change of the experimental armor under pressure, and the voltage source provides stable voltage for the low-temperature extensometer and the pressure sensor;
the acquisition control unit comprises an upper computer, a compact RIO controller and an auxiliary acquisition board card;
the FPGA acquisition program is used for acquiring the application force and the experimental armor strain displacement of the mechanical experiment machine;
the RT data processing program is used for processing data acquired by the FPGA layer and processing pressure, cycle times, energy and displacement information;
the upper computer control program is a man-machine interaction program and an interaction program with the temperature controller and the liquid level controller, and is used for displaying displacement and pressure change, setting the adjusting range of temperature and liquid level and sending out related control instructions of an operator;
the FPGA acquisition program and the RT data processing program adopt an FIFO protocol for data transmission, and the RT data processing program and the upper computer control program adopt a network variable and a network flow protocol for data transmission.
2. The automated mechanical property testing system for superconducting conductors according to claim 1, wherein: the temperature controller adopts RS485 communication protocol to establish connection with the compactRIO controller, and the liquid level controller adopts TCP/IP communication protocol to establish connection with the compactRIO controller.
3. The automated mechanical property testing system for superconducting conductors according to claim 1, wherein: the heating control unit is used for heating the pressure sensor and ensuring that the pressure sensor works in a temperature range of 15-30 ℃.
4. The automated mechanical property testing system for superconducting conductors according to claim 3, wherein: the heating control unit is characterized in that the appearance of the heating resistor is annular, the heating plate is hollow cylindrical, and the inner annular wall is threaded.
5. The automated mechanical property testing system for superconducting conductors according to claim 4, wherein: and a gap between the heating resistor and the groove of the lower heating plate is filled with soldering tin, and the upper heating plate and the lower heating plate are sealed by welding.
6. The automated mechanical property testing system for superconducting conductors according to claim 1, wherein: the liquid level control unit is used for regulating and controlling the height of the low-temperature liquid, opening the electromagnetic valve to perform liquid supplementing when the liquid level is lower than a system set value, and stopping the liquid supplementing when the liquid level is higher than the system set value, so that the liquid is ensured to be always in a low-temperature medium in the test process.
7. The automated mechanical property testing system for superconducting conductors according to claim 1, wherein: the low-temperature extensometer adopts a nilos type ultralow-temperature extensometer, 4 low-temperature strain gauges are installed on bridge arms on two sides of the low-temperature extensometer, and strain changes on the bridge arms are accurately measured in a temperature range of 4.2K-77K.
8. The automated mechanical property testing system for superconducting conductors according to claim 1, wherein: the FPGA acquisition program and the RT data processing program run on a compact RIO controller, and the upper computer control program runs on a PC (personal computer); the FPGA end acquisition program supports shunt calibration and offset calibration of displacement and pressure measurement and adjustment of sampling frequency; the RT data processing program can distinguish the cycle times, automatically judge the most value of pressure displacement of each cycle and calculate the energy of each cycle; the data storage file of the RT data processing program is in a TDMS format, and the data is stored in an external storage container of the compactRIO controller.
9. The automated mechanical property testing system for superconducting conductors according to claim 8, wherein: the RT data processing program comprises an upper computer message receiving and sending process, an RT end message processing process, a data analysis processing process, a data storage process and an FPGA end message receiving and sending process.
10. A method for implementing an automated system for testing mechanical properties of superconducting conductors according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
(1) assembling components of the test system;
a. placing a heating resistor in a groove of the lower heating plate, filling a gap with soldering tin, welding and sealing the upper heating plate and the lower heating plate, and connecting the heating resistor with a temperature monitor;
b. embedding the temperature sensor into the upper heating disc, and simultaneously connecting a signal wire of the temperature sensor into a temperature controller;
c. the liquid level sensor is placed in a measuring container, vertically placed and fixed by a bracket, and simultaneously connected with a liquid level monitor;
d. installing a low-temperature control valve at the output end of a low-temperature medium, and connecting a corresponding control signal line with a liquid level controller;
e. connecting the temperature monitor, the liquid level controller and the CompactRIO controller;
f. connecting the low-temperature extensometer with an auxiliary module of a CompactRIO controller;
(2) setting relevant parameters of an FPGA acquisition program, a temperature monitor, a liquid level monitor and a mechanical testing machine;
(3) starting a test, and collecting, analyzing and storing related data:
a. opening a test system acquisition page, acquiring signals and starting a data storage function;
b. starting a mechanical testing machine to start testing;
c. analyzing data of a test system, acquiring a pressure value and a displacement value of the current moment in real time by the test system, serializing, entering a maximum period distinguishing mode when the acquired pressure value is greater than 90% of a predicted pressure value for the first time, acquiring the maximum value from the current moment to the previous moment when the acquired pressure value is less than 90% of the predicted pressure value again, simultaneously recording a data serial number of the moment, indexing all pressure values of the serial number to an ending serial number of the previous moment, acquiring the minimum value and recording the serial number of the data, taking out the pressure value and the displacement value from the minimum serial number to the maximum serial number, outputting test data required by the cyclic loading, re-serializing next group of data, and outputting an analysis and processing result;
(4) and stopping collecting and storing after the experiment is finished, and exporting experimental data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111634236.7A CN114279861B (en) | 2021-12-29 | 2021-12-29 | Automatic testing system for mechanical properties of superconducting conductor and implementation method thereof |
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