CN112781812A - Fatigue testing method for metal diaphragm of diaphragm compressor - Google Patents
Fatigue testing method for metal diaphragm of diaphragm compressor Download PDFInfo
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- CN112781812A CN112781812A CN201911073507.9A CN201911073507A CN112781812A CN 112781812 A CN112781812 A CN 112781812A CN 201911073507 A CN201911073507 A CN 201911073507A CN 112781812 A CN112781812 A CN 112781812A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000009661 fatigue test Methods 0.000 title claims abstract description 30
- 239000002184 metal Substances 0.000 title claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 118
- 230000001133 acceleration Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000004088 simulation Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 17
- 230000007704 transition Effects 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 10
- 238000004904 shortening Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000009774 resonance method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
Abstract
The invention discloses a fatigue testing method for a metal diaphragm of a diaphragm compressor, which comprises the following steps: s0, designing the shape of the diaphragm test piece through simulation, so that the fundamental frequency of the diaphragm test piece is about 200Hz which is several times of the operating frequency of the diaphragm in the compressor, shortening the fatigue test time, and ensuring that the maximum stress appears at the required part; s1, pressing and fixing the diaphragm test piece on a vibration table in a cantilever manner; step S2, determining the fundamental frequency of the diaphragm test piece through the maximum deformation of the diaphragm test piece; step S3, adjusting the acceleration of the vibration table and enabling the stress of the test sample piece to reach a required test stress value; and step S4, the diaphragm test piece is damaged, and the fatigue life of the actual compressor operation diaphragm is obtained through conversion. The invention foresees the performance of the diaphragm in advance, can improve in advance, shortens the development period and improves the development efficiency and reliability; the testing device and the testing steps are simple, and the fatigue life of the diaphragm can be conveniently and directly tested.
Description
Technical Field
The invention relates to a fatigue testing method for a metal diaphragm of a diaphragm compressor.
Background
The diaphragm compressor divides a system into a hydraulic part and a gas part through a diaphragm, and hydraulic oil periodically pushes the diaphragm to reciprocate to compress gas, so that high-pressure compression of the gas is realized. At present, diaphragm compressors have been widely used in the fields of food industry, petroleum industry, chemical industry, aerospace, medicine, scientific research, and the like.
The metal diaphragm is a key part of the diaphragm compressor, and the service life of the metal diaphragm directly influences the reliability of the diaphragm compressor. When the diaphragm is selected, the fatigue test is needed to test the reliability of the metal diaphragm. At present, the reliability test of the diaphragm compressor is carried out on the whole machine, so that the test period is long, the cost is high, and the existing problems can not be exposed in advance.
Disclosure of Invention
The invention aims to overcome the defects that the metal diaphragm of the diaphragm compressor in the prior art has long test period and high cost, and the performance of the diaphragm cannot be known in advance, and provides a fatigue test method for the metal diaphragm of the diaphragm compressor.
The invention solves the technical problems through the following technical scheme:
the fatigue testing method for the metal diaphragm of the diaphragm compressor is characterized by comprising the following steps of:
s0, designing the shape of the diaphragm test piece through simulation, and enabling the predicted fundamental frequency of the diaphragm test piece to be multiple times of the actual operating frequency of the diaphragm in the compressor so as to shorten the fatigue test time and ensure that the maximum stress of the diaphragm test piece appears at a preset position;
s1, pressing and fixing the diaphragm test piece on a vibration table in a cantilever manner;
step S2, adjusting the vibration frequency of the vibration table, and determining the fundamental frequency of the diaphragm test piece through the maximum deformation of the diaphragm test piece;
step S3, keeping the vibration frequency of the vibration table as the fundamental frequency of the diaphragm test piece, adjusting the acceleration of the vibration table and enabling the stress of the test sample piece to reach the required test stress value;
and step S4, the diaphragm test piece is damaged, the fatigue life of the diaphragm test piece is obtained, and the fatigue life of the diaphragm in the actual compressor is obtained through conversion.
The invention adjusts the stress of the diaphragm test piece when in resonance to be equivalent to the stress of the diaphragm in the actual working process, thereby simulating the fatigue of the diaphragm in the periodic alternating stress state of the whole machine by adopting a resonance method. Therefore, the operation is convenient and fast, the conclusion is reliable, and the extreme working conditions occurring in the operation process of the diaphragm are truly simulated.
Compared with the traditional method for testing the service life of the diaphragm on the whole machine, the fatigue testing method for the metal diaphragm of the diaphragm compressor has the advantages that the performance of the diaphragm is predicted in advance, the performance can be improved in advance, the development period of the diaphragm is shortened, and the development efficiency and the reliability of the whole machine of the diaphragm compressor are improved;
the testing device and the testing steps used in the diaphragm compressor metal diaphragm fatigue testing method are simple, and the fatigue life of the diaphragm can be conveniently and directly tested.
Preferably, a strain gauge is adhered to the diaphragm test piece, and the stress of the diaphragm test piece is measured through the strain gauge. The strain gauge is a commonly used measuring element and is used for measuring the stress of the position where the strain gauge is located in the resonance process of the diaphragm test piece.
Preferably, the diaphragm test piece has a cantilever portion and a resonance portion, and the cantilever portion is pressed and fixed on the vibration table. The resonance portion is provided in the form of a cantilever, and thus can be deformed without being constrained.
Preferably, the cantilever portion narrows to the resonance portion and is provided with an arc transition, and the strain gauge is disposed at a central portion of the arc transition. When the diaphragm test piece generates resonance, the maximum stress value is at the central part of the circular arc transition, so that the strain gauge arranged at the central part can accurately measure the required stress value.
Preferably, the resonance part is provided with a round hole, and the round hole is used for penetrating a locking screw.
Preferably, the diaphragm test piece is pressed on the vibration table through a pressing tool and a locking screw. The pressing tool is used for pressing the sample and is locked through the locking screw.
Preferably, the natural frequency of the pressing tool is 5 times or more of the fundamental frequency of the diaphragm test piece. Furthermore, the natural frequency of the pressing tool is far greater than the fundamental frequency of the diaphragm test piece, so that the pressing tool is ensured not to influence the measurement of the fundamental frequency of the diaphragm test piece in the test.
Preferably, in step S2, the vibration frequency of the vibration table is adjusted around the predicted value of the fundamental frequency of the diaphragm test piece. By adjusting near the predicted value of the fundamental frequency of the diaphragm test piece, the adjusting time can be shortened, and the fundamental frequency of the diaphragm test piece can be quickly found.
Preferably, in step S3, the displacement of the same position of the diaphragm test piece is detected by the displacement sensor. In the testing process, the stress of the diaphragm test piece has a corresponding relation with the displacement of the diaphragm test piece. Due to the relatively high frequency of vibration, strain gauges are prone to failure. Therefore, the displacement of the diaphragm test piece is monitored through the displacement sensor, so that the stress detection strain gauge can continue to be tested normally after failing.
Preferably, in step S4, the fatigue life of the diaphragm in the actual compressor is obtained by multiplying the fatigue life of the diaphragm test piece by the amplification factor of the predicted fundamental frequency of the diaphragm test piece relative to the actual operating frequency of the diaphragm in the compressor. The invention performs the deceleration test by increasing the vibration frequency, and the fatigue life after the test is converted by the magnification factor to obtain the actual fatigue life of the diaphragm in the compressor.
The positive progress effects of the invention are as follows: compared with the traditional method for testing the service life of the diaphragm on the whole machine, the fatigue testing method for the metal diaphragm of the diaphragm compressor has the advantages that the performance of the diaphragm is predicted in advance, the performance can be improved in advance, the development period of the diaphragm is shortened, and the development efficiency and the reliability of the whole machine of the diaphragm compressor are improved; the testing device and the testing steps are simple, and the fatigue life of the diaphragm can be conveniently and directly tested.
Drawings
Fig. 1 is a flow chart of a fatigue testing method for a metal diaphragm of a diaphragm compressor according to a preferred embodiment of the invention.
FIG. 2 is a schematic structural diagram of a testing apparatus according to a preferred embodiment of the invention.
FIG. 3 is a schematic structural diagram of a diaphragm test piece according to a preferred embodiment of the invention.
Fig. 4 is a schematic view of a connection structure of a strain gage according to a preferred embodiment of the invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, the present embodiment discloses a fatigue testing method for a metal diaphragm of a diaphragm compressor, wherein the fatigue testing method for the metal diaphragm of the diaphragm compressor includes the following steps:
step S0, designing the shape of the diaphragm test piece 2 through simulation, and enabling the predicted fundamental frequency of the diaphragm test piece 2 to be multiple times of the actual operating frequency of the diaphragm in the compressor, so as to shorten the fatigue test time and ensure that the maximum stress of the diaphragm test piece 2 appears at a preset position;
step S1, pressing and fixing the diaphragm test piece 2 on the vibration table 1 in a cantilever manner;
step S2, adjusting the vibration frequency of the vibration table 1, and determining the fundamental frequency of the diaphragm test piece 2 through the maximum deformation of the diaphragm test piece 2;
step S3, keeping the vibration frequency of the vibration table 1 as the fundamental frequency of the diaphragm test piece 2, adjusting the acceleration of the vibration table 1 and enabling the stress of the test sample piece to reach a required test stress value;
and step S4, the diaphragm test piece 2 is damaged, the fatigue life of the diaphragm test piece 2 is obtained, and the fatigue life of the diaphragm in the actual compressor is obtained through conversion.
The invention adopts the resonance method to simulate the fatigue of the diaphragm in the periodic alternating stress state of the whole machine by adjusting the stress of the diaphragm test piece 2 when in resonance to be equivalent to the stress of the diaphragm in the actual working process. Therefore, the operation is convenient and fast, the conclusion is reliable, and the extreme working conditions occurring in the operation process of the diaphragm are truly simulated.
Compared with the traditional method for testing the service life of the diaphragm on the whole machine, the fatigue testing method for the metal diaphragm of the diaphragm compressor has the advantages that the performance of the diaphragm is predicted in advance, the performance can be improved in advance, the development period of the diaphragm is shortened, and the development efficiency and the reliability of the whole machine of the diaphragm compressor are improved;
the testing device and the testing steps used in the diaphragm compressor metal diaphragm fatigue testing method are simple, and the fatigue life of the diaphragm can be conveniently and directly tested.
As shown in fig. 3, the diaphragm specimen 2 of the present embodiment is attached with a strain gauge 5, and the stress of the diaphragm specimen 2 is measured by the strain gauge 5. The strain gauge 5 is a commonly used measuring element and is used for measuring the stress of the part of the diaphragm test piece 2 where the strain gauge 5 is located in the resonance process.
As shown in fig. 4, the diaphragm test piece 2 of the present embodiment includes a cantilever portion 21 and a resonance portion 22, and the cantilever portion 21 is fixed to the vibration table 1 by being pressed. The resonance portion 22 is provided in the form of a cantilever, and thus can be deformed without being constrained.
As shown in fig. 4, the cantilever portion 21 of the present embodiment is narrowed to the resonance portion 22 and provided with an arc transition 23, and the strain gauge 5 is provided at a central portion of the arc transition 23. When the diaphragm test piece 2 generates resonance, the maximum stress value is at the central part of the circular arc transition 23, so that the strain gauge 5 is arranged at the central part, and the required stress value can be accurately measured.
As shown in fig. 4, the resonance part 22 of the present embodiment is provided with a circular hole 24, and the circular hole 24 is used for inserting the locking screw 3.
As shown in fig. 1, the diaphragm test piece 2 of the present embodiment is pressed against the vibration table 1 by a pressing tool 4 and a locking screw 3. And the pressing tool 4 is used for pressing the sample and is locked by the locking screw 3.
In this embodiment, the natural frequency of the pressing tool 4 is 5 times or more of the fundamental frequency of the diaphragm test piece 2. Further, the natural frequency of the pressing tool 4 must be far greater than the fundamental frequency of the diaphragm test piece 2, so that the pressing tool 4 is ensured not to influence the measurement of the fundamental frequency of the diaphragm test piece in the test.
In this embodiment, in step S2, the vibration frequency of the vibration table 1 is adjusted near the predicted value of the fundamental frequency of the diaphragm test piece 2. By adjusting near the predicted value of the fundamental frequency of the diaphragm test piece 2, the adjusting time can be shortened, and the fundamental frequency of the diaphragm test piece 2 can be quickly found.
In step S3 of the present embodiment, the displacement of the same position of the diaphragm specimen 2 is detected by the displacement sensor. During the test, the stress of the diaphragm test piece 2 has a corresponding relationship with the displacement thereof. Therefore, the displacement of the diaphragm test piece 2 is monitored through the displacement sensor, so that the stress detection strain gauge 5 can continue to be tested normally after being failed.
In step S4 of this embodiment, the fatigue life of the diaphragm in the actual compressor is obtained by multiplying the fatigue life of the diaphragm test piece by the amplification factor of the predicted fundamental frequency of the diaphragm test piece 2 with respect to the operating frequency of the diaphragm in the actual compressor. The invention performs the deceleration test by increasing the vibration frequency, and the fatigue life after the test is converted by the magnification factor to obtain the actual fatigue life of the diaphragm in the compressor.
Example (b): the designed fundamental frequency of the diaphragm test piece is 207HZ, the frequency of the vibration table is always kept to be 207HZ and is kept consistent with the fundamental frequency of the diaphragm test piece, the acceleration of the test table is adjusted to enable the maximum stress of a strain gauge on the diaphragm test piece to be the designed stress, the acceleration of the vibration table is 4g, meanwhile, the displacement of a specific position of a test sample is calibrated by using a displacement sensor, and after the strain gauge fails, the displacement curve of the point is monitored, and the maximum displacement deviation is ensured to be within a reasonable range; when the displacement deviation is too large, the fatigue of the sample is shown, the recording and testing time is 278h, and the actual service life of the diaphragm is 8631h in the using process of the diaphragm compressor.
In summary, the following steps: compared with the traditional method for testing the service life of the diaphragm on the whole machine, the fatigue testing method for the metal diaphragm of the diaphragm compressor has the advantages that the performance of the diaphragm is predicted in advance, the performance can be improved in advance, the development period of the diaphragm is shortened, and the development efficiency and the reliability of the whole machine of the diaphragm compressor are improved; the testing device and the testing steps are simple, and the fatigue life of the diaphragm can be conveniently and directly tested.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The fatigue testing method for the metal diaphragm of the diaphragm compressor is characterized by comprising the following steps of:
s0, designing the shape of the diaphragm test piece through simulation, and enabling the predicted fundamental frequency of the diaphragm test piece to be multiple times of the actual operating frequency of the diaphragm in the compressor so as to shorten the fatigue test time and ensure that the maximum stress of the diaphragm test piece appears at a preset position;
s1, pressing and fixing the diaphragm test piece on a vibration table in a cantilever manner;
step S2, adjusting the vibration frequency of the vibration table, and determining the fundamental frequency of the diaphragm test piece through the maximum deformation of the diaphragm test piece;
step S3, keeping the vibration frequency of the vibration table as the fundamental frequency of the diaphragm test piece, adjusting the acceleration of the vibration table and enabling the stress of the test sample piece to reach the required test stress value;
and step S4, the diaphragm test piece is damaged, the fatigue life of the diaphragm test piece is obtained, and the fatigue life of the diaphragm in the actual compressor is obtained through conversion.
2. The fatigue testing method for the metal diaphragm of the diaphragm compressor as claimed in claim 1, wherein a strain gauge is adhered on the diaphragm test piece, and the stress of the diaphragm test piece is measured through the strain gauge.
3. The diaphragm compressor metal diaphragm fatigue testing method of claim 2, wherein said diaphragm test piece has a cantilever portion and a resonance portion, said cantilever portion being press-fixed on a vibration table.
4. The fatigue testing method for the metal diaphragm of the diaphragm compressor according to claim 3, wherein the cantilever portion is narrowed to the resonance portion and provided with an arc transition, and the strain gauge is arranged at a central portion of the arc transition.
5. The fatigue testing method for the metal diaphragm of the diaphragm compressor as claimed in claim 4, wherein a round hole is formed on the resonance part, and the round hole is used for penetrating a locking screw.
6. The fatigue testing method for the metal diaphragm of the diaphragm compressor according to claim 1, wherein the diaphragm test piece is pressed on the vibration table through a pressing tool and a locking screw.
7. The fatigue testing method for the metal diaphragm of the diaphragm compressor according to claim 6, wherein the natural frequency of the pressing tool is 5 times or more of the fundamental frequency of the diaphragm test piece.
8. The fatigue testing method for a metal diaphragm of a diaphragm compressor according to claim 1, wherein in step S2, the vibration frequency of the vibration table is adjusted around the predicted value of the fundamental frequency of the diaphragm test piece.
9. The fatigue test method for a metal diaphragm of a diaphragm compressor according to claim 1, wherein in step S3, the displacement of the same position of the diaphragm test piece is detected by a displacement sensor.
10. The fatigue testing method for the metal diaphragm of the diaphragm compressor according to claim 1, wherein in step S4, the fatigue life of the diaphragm in the actual compressor is obtained by multiplying the fatigue life of the diaphragm test piece by the amplification factor of the predicted fundamental frequency of the diaphragm test piece relative to the operation frequency of the diaphragm in the actual compressor.
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| CN201911073507.9A CN112781812A (en) | 2019-11-01 | 2019-11-01 | Fatigue testing method for metal diaphragm of diaphragm compressor |
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| CN201911073507.9A CN112781812A (en) | 2019-11-01 | 2019-11-01 | Fatigue testing method for metal diaphragm of diaphragm compressor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114544361A (en) * | 2022-01-12 | 2022-05-27 | 沈阳航天新光集团有限公司 | Mechanical environment test method for metal film propellant storage tank |
| CN116181632A (en) * | 2022-12-01 | 2023-05-30 | 上海羿弓氢能科技有限公司 | Electromagnetic excitation type diaphragm compressor diaphragm hydrogen environment life test device |
| CN116735391A (en) * | 2023-04-25 | 2023-09-12 | 中鼎恒盛气体设备(芜湖)股份有限公司 | Fatigue testing device for metal diaphragm of diaphragm compressor |
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Application publication date: 20210511 |