CN105699037A - Transmission press filter cover vibration test apparatus and method - Google Patents
Transmission press filter cover vibration test apparatus and method Download PDFInfo
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- CN105699037A CN105699037A CN201410682440.XA CN201410682440A CN105699037A CN 105699037 A CN105699037 A CN 105699037A CN 201410682440 A CN201410682440 A CN 201410682440A CN 105699037 A CN105699037 A CN 105699037A
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Abstract
The invention relates to a transmission press filter cover vibration test apparatus and method. The test apparatus comprises a vibration table and at least one connecting block; the vibration table can vibrate along a Z direction, wherein the Z direction is a vertical direction; the connecting blocks are connected with the vibration table; a first screw thread hole and a second screw thread hole are formed in each connecting block; the axial direction of the first screw thread hole is located along an X direction; the axial direction of the second screw thread hole is located along the Z direction; the X direction is vertical to the Z direction; and the first screw thread hole and the second screw thread hole are used for connecting a press filter cover. According to the transmission press filter cover vibration test apparatus and method of the invention, the vibration table can realize the vibration of the press filter cover in the X direction and the Z direction, and therefore, the vibration of the press filter cover in the X, Y and Z direction of a vehicle coordinate system can be simulated; and the anti-vibration performance of the press filter cover of a transmission can be verified through tests.
Description
Technical field
The present invention relates to the assay device of auto parts and components, specifically, relate to a kind of change speed gear box filter press lid vibration testing device and test method。
Background technology
Along with people are more and more higher to the requirement of driver comfort, and strict to the raising of fuel efficient and Abgasgesetz, double; two clutch speed-changing box technologies are rapidly developed。Double; two clutch gearboxes have structure and the operation principle of uniqueness, and the requirement of lubricating oil is higher, and the cleannes of fluid will directly affect the service life of change speed gear box。The effect of filter press is to utilize float in filter element separation lubrication oil and the bonding colloidal particles can not removed through precipitation so that lubricating oil purity is higher。
Filter press includes: has the housing of opening, be covered on opening part and the filter press lid being connected with housing。Filter press lid is to be threaded connection housing。Definition: the direction that automobile advances is X-direction, and the left and right directions of automobile direction of advance is Y-direction, and vertical direction is Z-direction。In vehicle traveling process, change speed gear box vibrates in X/Y/Z direction with car load, therefore filter press lid also vibrates in X/Y/Z direction, filter press lid can occur moment of torsion to decay, thus causing loosening of filter press lid, if filter press lid comes off, gear box oil can spray, and the exhaust manifold temperature of electromotor up to 800 DEG C～1000 DEG C, the ejection of gear box oil then can cause burning, there is potential safety hazard。Not yet find equipment and the method for maturation currently for the test of double clutch gearbox filter press lid pressure vibration, also just cannot use the freedom from vibration of verification experimental verification double clutch gearbox filter press lid。
Summary of the invention
The problem that this invention address that is to provide a kind of change speed gear box filter press lid vibration testing device。
For solving the problems referred to above, the present invention provides a kind of double clutch gearbox filter press lid vibration testing device, including:
Vibration table, described vibration table can vibrate along Z-direction, and described Z-direction is vertical direction；
At least one coupling block, described coupling block and described vibration table connect, described coupling block is provided with the first screwed hole and the second screwed hole, described first screwed hole axially along X-direction, described second screwed hole axially along Z-direction, described X-direction is perpendicular to described Z-direction, and described first screwed hole, the second screwed hole are used for connecting filter press lid。
Optionally, for collecting the first acceleration transducer of vibration signal, described first acceleration transducer is located on described vibration table；For collecting the second acceleration transducer of vibration signal, described second acceleration transducer is located on described coupling block。
Optionally, described coupling block is provided with the connecting tooling for connecting different model filter press lid, and described connecting tooling is connected with described first screwed hole and the second screwed hole。
Optionally, being provided with connecting plate, described connecting plate and described coupling block and be bolted between described vibration table and described coupling block, described vibration table and described connecting plate are bolted。
Optionally, described coupling block is 1-3。
The present invention also provides for a kind of filter press lid vibration testing method, including:
Obtain filter press lid and be installed on the screw-down torque size of the first screwed hole, be recorded as T1；
Obtain filter press lid and be installed on the screw-down torque size of the second screwed hole, be recorded as T2；
Described vibration table is made to vibrate along Z-direction, the vibration of simulation filter press lid real vehicle actual condition；After the described vibration table vibration scheduled time, stop vibration, unscrew filter press lid, obtain the loosening torque size being installed on the first screwed hole filter press lid, be recorded as L1；
Obtain the loosening torque size being installed on the second screwed hole filter press lid, be recorded as L2；
Value according to T1, T2, L1, L2 obtains the moment of torsion attenuation rate of filter press lid X-direction and Z-direction, if moment of torsion attenuation rate is lower than setting value, then filter press lid is tested by freedom from vibration。
Optionally, also include: detect the vibration signal value of the first acceleration transducer, be recorded as A；
Detect the vibration signal value of the second acceleration transducer, be recorded as B；
Calculate the vibration test error of described filter press lid, be designated as M:
Judging that whether M is less than setting value, if less than setting value, then filter press lid Vibration Condition meets real vehicle actual condition。
Optionally, when the filter press lid quantity can installed on described coupling block is less than required sample size,
The preparation method of described T1, T2, L1, L2 includes:
After filter press lid being tightened in the first screwed hole, the second screwed hole, measure each X-direction screw-down torque and Z-direction screw-down torque every time；
Often vibration table of vibration, measures each X-direction loosening torque and Z-direction loosening torque；
The step repeat to tighten, vibrating is at least one times；
Calculate the meansigma methods of the X-direction screw-down torque of all acquisitions and the meansigma methods of Z-direction screw-down torque, the X-direction loosening torque of all acquisitions and Z-direction loosening torque, it is thus achieved that T1, T2, L1, L2。
Optionally, when the filter press lid quantity can installed on described coupling block is be more than or equal to required sample size, the preparation method of described T1, T2, L1, L2 includes:
After filter press lid is tightened in each coupling block the first screwed hole, the second screwed hole, measure filter press lid X-direction screw-down torque and Z-direction screw-down torque on each coupling block respectively；
Vibration table vibrates once, measures filter press lid X-direction loosening torque and Z-direction loosening torque on each coupling block；
Calculate the meansigma methods of the X-direction screw-down torque of all acquisitions and the meansigma methods of Z-direction screw-down torque, the X-direction loosening torque of all acquisitions and Z-direction loosening torque, obtain T1, T2, L1, L2 respectively。
Compared with prior art, technical scheme has the advantage that
The direction of vibration of vibration table is Z-direction (vertical direction), filter press lid is arranged on coupling block by screwed hole, filter press lid cross section is round, therefore X-direction and Y-direction vibration equivalent, vibration table achieves filter press lid X-direction and Z-direction vibration, covering in the vibration of car load coordinate system X/Y/Z direction thus simulating filter press, then can use the freedom from vibration of verification experimental verification change speed gear box filter press lid。
Further, because being provided with the first acceleration transducer and the second acceleration transducer, in vibration test process, two acceleration transducers can collect the vibration signal of filter press lid, calculate the vibration test error of filter press lid, it is judged that whether the vibration test error of filter press lid is less than setting value, if less than setting value, then vibration table Vibration Condition meets real vehicle actual condition, it is ensured that the accuracy of test。
The freedom from vibration test of the filter press lid of different model further, because coupling block is provided with connecting tooling, the filter press lid of different model can be connected, thus can be achieved。
Further, because being provided with multipair coupling block, the test of multipair filter press lid pressure vibration can be carried out simultaneously, add test sample amount, improve the efficiency of test, reduce the error of test, reduce experimentation cost。
Accompanying drawing explanation
Fig. 1 is the double clutch gearbox filter press lid pressure vibration assay device schematic diagram of the embodiment of the present invention；
Fig. 2 is the double clutch gearbox filter press lid vibration test coupling block schematic diagram of the embodiment of the present invention。
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail。
The embodiment of the present invention provides a kind of double clutch gearbox filter press lid vibration testing device, sees figures.1.and.2, including:
Vibration table 10, described vibration table 10 can vibrate along Z-direction, and described Z-direction is vertical direction；
At least one coupling block 50, described coupling block 50 and described vibration table 10 connect, described coupling block 50 is provided with the first screwed hole 52 and the second screwed hole 51, described first screwed hole 52 axially along X-direction, described second screwed hole 51 axially along Z-direction, described X-direction is perpendicular to described Z-direction, and described first screwed hole the 52, second screwed hole 51 is used for connecting filter press lid。Above-mentioned coupling block be shaped as cuboid, but be not limited only to cuboid, it is possible to for square, cylinder or other shape。
Above-mentioned vibration table 10 is a kind of device utilizing pressure electronic, electro-hydraulic, piezoelectricity or other principles to obtain mechanical vibration。Its principle is that pumping signal is inputted a coil being placed in magnetic field, drives the workbench being connected with coil。Can analog equipment manufacturing, assemble, the vibration environment that suffers in transport and use procedure, to evaluate the resistance to vibration of its structure, reliability and integrity。The present embodiment adopt vibration table 10 simulate the Vibration Condition that filter press covers in vehicle traveling process, thus evaluating the freedom from vibration of filter press lid。
The operation principle of the embodiment of the present invention is as follows:
Filter press covers and vibrates in car load coordinate system X/Y/Z direction, filter press lid cross section is round, therefore filter press lid cross section X to Y-direction vibration equivalent, so the vibration test of filter press lid assay device of the present invention simulation filter press lid real vehicle actual condition only need to realize X on vibration table 10 and vibrate to Z-direction；Described first screwed hole the 52, second screwed hole 51 is used for installing described X to filter press lid 40 and Z-direction filter press lid 41, the direction of vibration of vibration table 10 is Z-direction (vertical direction), the vibration of vibration table 10 driven filter press lid cross section X to vibration and the vibration of Z-direction, namely simulate the X of filter press lid to the vibration with Z-direction。
On the basis of this principle, the invention provides a kind of filter press lid vibration testing method based on change speed gear box filter press lid vibration testing device, before the test:
First, described vibration table 10 is coupled together by bolt and described connecting plate 30；
Secondly, described coupling block 50 and described connecting plate 30 are connected by bolt 53。
Subsequently into experimental stage:
Measure filter press lid and be installed on the screw-down torque size of the first screwed hole, be recorded as T1；
Measure filter press lid and be installed on the screw-down torque size of the second screwed hole, be recorded as T2；
Described vibration table is made to vibrate along Z-direction, the vibration of simulation filter press lid real vehicle actual condition；After the described vibration table vibration scheduled time, stop vibration, unscrew filter press lid, measure the loosening torque size being installed on the first screwed hole filter press lid, be recorded as L1；
Measure the loosening torque size being installed on the second screwed hole filter press lid, be recorded as L2；
Value according to T1, T2, L1, L2 obtains the moment of torsion decay of filter press lid X-direction and Z-direction:
The computing formula of the moment of torsion attenuation rate of X-direction is:
The computing formula of the moment of torsion attenuation rate of Z-direction is:
If moment of torsion attenuation rate is lower than setting value, then filter press lid is tested by freedom from vibration。
It is additionally provided with connecting plate 30 between above-mentioned vibration table 10 and coupling block 50, described connecting plate 30 and described coupling block 50 are connected by bolt 53, described vibration table 10 and described connecting plate 30 are bolted, described coupling block 50 is 1-3, on first screwed hole 52 and the second screwed hole 51 of described coupling block 50, installing X to be threaded connection to filter press lid 40 and Z-direction filter press lid 41, filter press lid and described coupling block 50, wherein filter press lid cross section is round。
If, when the bolt hole of vibration table 10 and coupling block 50 mates, it is possible to when connecting smoothly, then without arranging connecting plate 30, directly coupling block 50 is arranged on vibration table 10, it is possible to simulation filter press covers the Vibration Condition in vehicle traveling process。
With continued reference to Fig. 1 and in conjunction with shown in Fig. 2, coupling block described in the present embodiment is 3, can carry out 6 filter press lid vibration tests simultaneously。
In other embodiments, coupling block number can be increased, for instance coupling block is 6, carry out the test of multiple filter press lid pressure vibration simultaneously, which adds test sample amount, improve the efficiency of test, reduce the error of test, reduce experimentation cost。
Additionally, the coupling block 50 of the present invention also can be provided with the connecting tooling (not shown) for connecting different model filter press lid, owing to the filter press lid thread size of different model is different, can not mate completely by the screwed hole completely and on coupling block 50, connecting tooling can mate corresponding screwed hole according to the filter press lid of different model, by connecting tooling, connect the filter press lid of different model, it is possible to achieve the vibration test to the filter press lid of different model。
Further, because vibration table is the Vibration Condition in simulated automotive driving process, when filter press lid is connected with vibration table 10 by coupling block 50 and connecting plate 30, it may appear that filter press lid is inconsistent with the frequency of vibration table, causes the distortion of Vibration Condition。Process of the test can allow certain range of error, for ensureing accuracy and the reliability of experiment, controls range of error, and filter press lid vibration testing device also includes:
For collecting the first acceleration transducer 20 of vibration signal, described first acceleration transducer 20 is located on described vibration table 10；
For collecting the second acceleration transducer 21 of vibration signal, described second acceleration transducer 21 is located at above described coupling block 50。
For making test more accurately and reliably, before on-test, at described vibration table 10 first acceleration transducer 20 installed above, at described coupling block 50 described second acceleration transducer 21 installed above。
In process of the test, detect the vibration signal value of the first acceleration transducer 20, be recorded as the vibration values that A, A are vibration table, meet the Vibration Condition in vehicle traveling process；Detect the vibration signal value of the second acceleration transducer 21, be recorded as the vibration values that B, B are filter press lid；Calculate the vibration test error of described filter press lid, be designated as M:
Judging that whether M is less than setting value, if less than setting value, then filter press lid Vibration Condition meets real vehicle actual condition。Such as, setting value is 5%, and the M calculated more than 5%, then needs matching oscillating curve again, until M is less than 5%, just can meet real vehicle actual condition, it is ensured that the accuracy of test。
In above-mentioned test method, when the filter press lid quantity can installed on described coupling block is less than required sample size, the preparation method of described T1, T2, L1, L2 includes:
After filter press lid being tightened in the first screwed hole, the second screwed hole, measure each X-direction screw-down torque and Z-direction screw-down torque every time；
Often vibration table of vibration, measures each X-direction loosening torque and Z-direction loosening torque；
The step repeat to tighten, vibrating is at least one times；
Calculate the meansigma methods of the X-direction screw-down torque of all acquisitions and the meansigma methods of Z-direction screw-down torque, the X-direction loosening torque of all acquisitions and Z-direction loosening torque, obtain T1, T2, L1, L2 respectively。
Such as, the quantity of coupling block is one, and the filter press lid quantity once can measured is 2, but needs to measure 8 filter press lids, so the number of times needing circulation is 4 times, concrete test method is:
First time measures primary X-direction screw-down torque and Z-direction screw-down torque, is recorded as T11 and T21 after filter press lid is tightened in the first screwed hole, the second screwed hole；
Vibrate a vibration table, measure primary X-direction loosening torque and Z-direction loosening torque, be recorded as L11 and L21；
Repeat the step 3 time tightened, vibrate；
Measure the X-direction screw-down torque and Z-direction screw-down torque that remain three times, be recorded as T12, T13, T14, T22, T23, T24；
Measure the X-direction loosening torque and Z-direction loosening torque that remain three times, be recorded as L12, L13, L14, L22, L23, L24；
Then T1=(T11+T12+T13+T14)/4；
T2=(T21+T22+T23+T24)/4；
L1=(L11+L12+L13+L14)/4；
L2=(L21+L22+L23+L24)/4；
After obtaining the numerical value of T1, T2, L1 and L2, according to aforesaid moment of torsion attenuation rate computing formula, calculate the moment of torsion attenuation rate of filter press lid X-direction and Z-direction。
When the filter press lid quantity can installed on described coupling block is be more than or equal to required sample size, the preparation method of described T1, T2, L1, L2 includes:
After filter press lid is tightened in each coupling block the first screwed hole, the second screwed hole, measure filter press lid X-direction screw-down torque and Z-direction screw-down torque on each coupling block respectively；
Vibration table vibrates once, measures filter press lid X-direction loosening torque and Z-direction loosening torque on each coupling block；
Calculate the meansigma methods of the X-direction screw-down torque of all acquisitions and the meansigma methods of Z-direction screw-down torque, the X-direction loosening torque of all acquisitions and Z-direction loosening torque, obtain T1, T2, L1, L2 respectively。
Such as, the quantity of coupling block is 4, and the filter press lid quantity once can measured is 8, and the sample size required for test is 8, the number of times of filter press lid needs circulation 1 time, meets test requirements document。So concrete test method is:
After filter press lid is tightened in the first screwed hole of four coupling blocks, the second screwed hole, measures the X-direction screw-down torque of filter press lid on four coupling blocks and be recorded as T11, T12, T13, T14；Z-direction screw-down torque, is recorded as T21, T22, T23, T24；
Vibrate a vibration table, measure the X-direction loosening torque of filter press lid on four coupling blocks and be recorded as L11, L12, L13, L14；Z-direction loosening torque, is recorded as L21, L22, L23, L24；
Then T1=(T11+T12+T13+T14)/4；
T2=(T21+T22+T23+T24)/4；
L1=(L11+L12+L13+L14)/4；
L2=(L21+L22+L23+L24)/4；
After obtaining the numerical value of T1, T2, L1 and L2, according to aforesaid moment of torsion attenuation rate computing formula, calculate the moment of torsion attenuation rate of filter press lid X-direction and Z-direction。Under the guidance of above-mentioned filter press lid vibration testing method, having carried out filter press lid vibration test, experimental condition is as follows:
1) frequency range: 20-320-20Hz；2) sweep rate: 2.40OCT/min；3) acceleration: 0.2-12-0.2g；4) direction: X, Z-direction；5) time: 36h；6) sample number: 12 (6 × X to, 6 × Z-direction)。
Logging is as follows:
| Test sample number | Screw-down torque/Nm | Loosening torque/Nm | Test period/h |
| M1(X) | 42.2 | 31.2 | 36 |
| M1(Z) | 42.8 | 34.4 | 36 |
| M2(X) | 42.6 | 39.1 | 36 |
| M2(Z) | 41.2 | 37.2 | 36 |
| M3(X) | 42.5 | 32.9 | 36 |
| M3(Z) | 41.4 | 34.2 | 36 |
| M4(X) | 41.6 | 33.1 | 36 |
| M4(Z) | 41.8 | 36.1 | 36 |
| M5(X) | 42.4 | 36.7 | 36 |
| M5(Z) | 42.6 | 35.7 | 36 |
| M6(X) | 41.5 | 29.3 | 36 |
| M6(Z) | 41.3 | 33.7 | 36 |
| X is to average | 42.13 | 33.72 | Moment of torsion is decayed: 19.96% |
| Z-direction average | 41.85 | 35.22 | Moment of torsion is decayed: 15.84% |
Above-mentioned result of the test is visible, 6 filter press lids have been carried out vibration test, record X to screw-down torque average 42.13Nm, X is to loosening torque average 33.72Nm, according to moment of torsion decay calculation formula: (screw-down torque-loosening torque)/screw-down torque, calculating the X obtaining filter press lid is 19.96% to moment of torsion attenuation rate；Filter press lid Z-direction screw-down torque average 41.85Nm, Z-direction loosening torque average 35.22Nm, calculating the Z-direction moment of torsion attenuation rate obtaining filter press lid is 15.84%；The moment of torsion attenuation rate setting value less than 22%, filter press lid X is tested to Z-direction by freedom from vibration。
Equally, the test data in the present embodiment is only an example, can need Adjustment Tests parameter according to test, including the adjustment to test datas such as test vibration frequency range, sweep rate, acceleration and times。
Equally, can need to increase coupling block quantity according to test in all the other embodiments, carry out the vibration test of multiple filter press lid, calculate the moment of torsion attenuation rate of filter press lid, see that whether moment of torsion attenuation rate is lower than 22%。If moment of torsion attenuation rate is lower than 22%, then filter press lid is tested by freedom from vibration, otherwise, filter press lid is then tested not over freedom from vibration。
It should be noted that the vibration test error setting value of filter press lid anti-vibration test is 5% in above-described embodiment, moment of torsion attenuation rate setting value is 22%, and these setting values can adjust as required, is not limited only to above-mentioned setting value。
Although present disclosure is as above, but the present invention is not limited to this。Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range。
Claims (9)
1. a change speed gear box filter press lid vibration testing device, it is characterised in that including:
Vibration table, described vibration table can vibrate along Z-direction, and described Z-direction is vertical direction；
At least one coupling block, described coupling block and described vibration table connect, described coupling block is provided with the first screwed hole and the second screwed hole, described first screwed hole axially along X-direction, described second screwed hole axially along Z-direction, described X-direction is perpendicular to described Z-direction, and described first screwed hole, the second screwed hole are used for connecting filter press lid。
2. change speed gear box filter press lid vibration testing device as claimed in claim 1, it is characterised in that also include:
For collecting the first acceleration transducer of vibration signal, described first acceleration transducer is located on described vibration table；
For collecting the second acceleration transducer of vibration signal, described second acceleration transducer is located on described coupling block。
3. change speed gear box filter press lid vibration testing device as claimed in claim 1, it is characterised in that described coupling block is provided with the connecting tooling for connecting different model filter press lid, and described connecting tooling is connected with described first screwed hole and the second screwed hole。
4. change speed gear box filter press lid vibration testing device as claimed in claim 1, it is characterized in that, being provided with connecting plate, described connecting plate and described coupling block between described vibration table and described coupling block to be bolted, described vibration table and described connecting plate are bolted。
5. change speed gear box filter press lid vibration testing device as claimed in claim 1, it is characterised in that described coupling block is 1-3。
6. one kind utilizes the method that the arbitrary described assay device of claim 1-5 carries out filter press lid vibration test, it is characterised in that including:
Obtain filter press lid and be installed on the screw-down torque size of the first screwed hole, be recorded as T1；
Obtain filter press lid and be installed on the screw-down torque size of the second screwed hole, be recorded as T2；
Described vibration table is made to vibrate along Z-direction, the vibration of simulation filter press lid real vehicle actual condition；
After the described vibration table vibration scheduled time, stop vibration, unscrew filter press lid, obtain the loosening torque size being installed on the first screwed hole filter press lid, be recorded as L1；
Obtain the loosening torque size being installed on the second screwed hole filter press lid, be recorded as L2；
Value according to T1, T2, L1, L2 obtains the moment of torsion attenuation rate of filter press lid X-direction and Z-direction, if moment of torsion attenuation rate is lower than setting value, then filter press lid is tested by freedom from vibration。
7. filter press lid vibration testing method according to claim 6, it is characterised in that also include:
Detect the vibration signal value of the first acceleration transducer, be recorded as A；
Detect the vibration signal value of the second acceleration transducer, be recorded as B；
Calculate the vibration test error of described filter press lid, be designated as M:
Judging that whether M is less than setting value, if less than setting value, then filter press lid Vibration Condition meets real vehicle actual condition。
8. filter press lid vibration testing method as claimed in claim 6, it is characterised in that when the filter press lid quantity can installed on described coupling block is less than required sample size, the preparation method of described T1, T2, L1, L2 includes:
After filter press lid being tightened in the first screwed hole, the second screwed hole, measure each X-direction screw-down torque and Z-direction screw-down torque every time；
Often vibration table of vibration, measures each X-direction loosening torque and Z-direction loosening torque；
The step repeat to tighten, vibrating is at least one times；
Calculate the meansigma methods of the X-direction screw-down torque of all acquisitions and the meansigma methods of Z-direction screw-down torque, the X-direction loosening torque of all acquisitions and Z-direction loosening torque, it is thus achieved that T1, T2, L1, L2。
9. filter press lid vibration testing method as claimed in claim 6, it is characterised in that when the filter press lid quantity can installed on described coupling block is be more than or equal to required sample size, the preparation method of described T1, T2, L1, L2 includes:
After filter press lid is tightened in each coupling block the first screwed hole, the second screwed hole, measure filter press lid X-direction screw-down torque and Z-direction screw-down torque on each coupling block respectively；
Vibration table vibrates once, measures filter press lid X-direction loosening torque and Z-direction loosening torque on each coupling block；
Calculate the meansigma methods of the X-direction screw-down torque of all acquisitions and the meansigma methods of Z-direction screw-down torque, the X-direction loosening torque of all acquisitions and Z-direction loosening torque, obtain T1, T2, L1, L2 respectively。
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| CN109357831A (en) * | 2018-11-30 | 2019-02-19 | 上海上汽马瑞利动力总成有限公司 | A kind of heavy vehicle power assembly vibration tong |
| CN111829742A (en) * | 2019-03-29 | 2020-10-27 | Oppo（重庆）智能科技有限公司 | Electronic equipment vibration testing method and device, electronic equipment and storage medium |
| CN112161770A (en) * | 2020-09-11 | 2021-01-01 | 江苏徐工工程机械研究院有限公司 | Bolt connection vibration testing system and method |
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