CN219996486U - Abnormal sound performance evaluation device - Google Patents
Abnormal sound performance evaluation device Download PDFInfo
- Publication number
- CN219996486U CN219996486U CN202320777099.0U CN202320777099U CN219996486U CN 219996486 U CN219996486 U CN 219996486U CN 202320777099 U CN202320777099 U CN 202320777099U CN 219996486 U CN219996486 U CN 219996486U
- Authority
- CN
- China
- Prior art keywords
- abnormal sound
- mounting plate
- performance evaluation
- mounting
- sound performance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 53
- 238000011156 evaluation Methods 0.000 title claims abstract description 30
- 230000001133 acceleration Effects 0.000 claims abstract description 46
- 230000005284 excitation Effects 0.000 claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 238000009434 installation Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 16
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 14
- 238000013016 damping Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000000007 visual effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000251131 Sphyrna Species 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model relates to the field of abnormal sound performance testing and discloses an abnormal sound performance evaluation device, wherein a fixing device is provided with a mounting position, an acceleration sensor is mounted on the outer surface of a measured part, a signal collector is electrically connected with the acceleration sensor, a terminal computer is electrically connected with the signal collector, an excitation applying module is electrically connected with the signal collector, the excitation applying module is arranged close to the mounting position, and the excitation applying module is used for knocking the measured part. The beneficial effects of the utility model are as follows: the noise detection device has the advantages that the structure is simple, the cost investment is low, compared with the traditional microphone, the noise collection device can greatly reduce errors caused by environmental noise background, compared with the friction method for measuring noise generated by movement between different parts, more using conditions can be met, for example, noise generated by vibration of the parts caused by external excitation and the like can be better detected and analyzed, and abnormal sound conditions under the conditions can be obtained.
Description
Technical Field
The utility model relates to the field of abnormal sound performance test, in particular to an abnormal sound performance evaluation device.
Background
When the plastic part is subjected to external force, the plastic part can generate stick-slip phenomenon, the plastic part is converted from sticked static friction to sliding friction, energy is released in the process, and the stick-slip circulation generates abnormal sound caused by material vibration; on the other hand, because of external excitation, the parts generate different vibration modes and abnormal sound. The damping performance of the system refers to the capability of converting solid mechanical vibration energy into heat energy, and generally, the better the damping performance is, the higher the capability of converting energy into internal energy caused by stick-slip phenomenon or product vibration is, and the smaller abnormal sound of the released parts is. At present, noise signals are collected by adopting a microphone, so that the background noise needs to be required to be high, and the sound field can influence the test result to a certain extent on surrounding radiation surfaces in an actual working environment. In addition, the mainstream material abnormal sound assessment method is that acceleration signals of the material in the friction process are detected through an acceleration sensor, the frequency of occurrence of the friction abnormal sound is represented by using the pulse rate of the acceleration signals, the maximum acceleration is used for representing the maximum noise of the occurrence of the friction abnormal sound, the acceleration integral represents the persistence of the occurrence of the friction abnormal sound, and the risk of the friction abnormal sound of the material is predicted through the acceleration sensor, the acceleration sensor and the acceleration sensor. Compared with the method for collecting noise signals by using a microphone, the method has lower requirements on background noise and is not influenced by factors such as surrounding radiation surfaces, sound fields and the like. However, this is usually simulated by noise caused by friction phenomena, and in actual conditions, sometimes friction between parts is microscopic, and in addition, a large part of the reasons are caused by resonance phenomena of the product itself due to external excitation. Thus, the above-described method has certain limitations.
Disclosure of Invention
The utility model aims to provide an abnormal sound performance evaluation device which is used for evaluating abnormal sound performance by knocking a measured part and collecting corresponding signals and analyzing to obtain an intuitive data curve.
The utility model aims at realizing the following technical scheme:
an abnormal sound performance evaluation device, comprising:
the fixing device is provided with an installation position for installing the tested part;
the acceleration sensor is used for being installed on the outer surface of the measured part;
the signal collector is electrically connected with the acceleration sensor;
the terminal computer is electrically connected with the signal collector; and
the excitation applying module is electrically connected with the signal collector, is close to the installation position and is used for knocking the measured part.
In some embodiments of the present utility model, the fixing device includes a first mounting plate and a second mounting plate, the mounting position is disposed above the first mounting plate, a plurality of T-shaped slots are disposed at the top of the second mounting plate at uniform intervals, the first mounting plate is connected to the top of the second mounting plate, and the first mounting plate is detachably mounted on the T-shaped slots.
In some embodiments of the present utility model, the first mounting plate includes a first plate body and a plurality of first bolts, the mounting position is disposed above the first plate body, the first plate body is provided with a plurality of mounting holes that are penetrated up and down, and the first bolts pass through the mounting holes and are mounted on the T-shaped groove.
In some embodiments of the present utility model, the first mounting plate further includes a plurality of second bolts for fixedly mounting the part under test on the first plate body.
In some embodiments of the present utility model, a plurality of fixing grooves are formed on a side wall of the second mounting plate.
In some embodiments of the present utility model, the excitation applying module includes a force hammer and a bracket, the force hammer is electrically connected with the signal collector, a hammer head of the force hammer is disposed near the mounting position, and a hammer handle of the force hammer is rotatably mounted on the bracket.
In some embodiments of the utility model, the excitation applying module further comprises a magnetic switch, the force hammer and the bracket being connected by the magnetic switch.
According to the abnormal sound performance evaluation device, the measured part is arranged on the mounting position of the fixing device, the acceleration sensor can sense the knocking acceleration signal applied by the excitation applying module, the force signal and the acceleration signal are transmitted to the terminal computer by the signal collector, the acceleration-time curve is obtained through analysis, the higher the amplitude attenuation is in the same time according to the acceleration-time curve, the higher the internal consumption of the material is, the better the damping noise reduction effect is, the abnormal sound performance evaluation is convenient and visual, the whole structure of the device is simple, the cost is low, compared with the traditional microphone for collecting noise, the error caused by the environmental noise background can be greatly reduced, compared with the noise generated by measuring the motion between different parts by a friction method, more using conditions such as noise generated by the vibration of the parts per se caused by external excitation can be better detected and analyzed, and the abnormal sound condition under the conditions can be obtained.
Drawings
FIG. 1 is a schematic view showing the overall structure of an abnormal sound performance evaluation apparatus according to the present utility model;
FIG. 2 is a schematic diagram of the structure of the utility model after the parts under test are installed;
FIG. 3 is a schematic view of the structure of the first mounting plate of the present utility model;
FIG. 4 is a schematic view of the structure of the part under test of the present utility model;
FIG. 5 is a test result of the abnormal sound performance evaluation device of the present utility model for detecting abnormal sound performance of a common material;
fig. 6 is a test result of the abnormal sound performance evaluation apparatus of the present utility model for detecting abnormal sound performance of an abnormal sound resistant material.
In the figure, 1, a fixing device; 11. a mounting position; 12. a first mounting plate; 121. a first plate body; 122. a first bolt; 123. a mounting hole; 124. a second bolt; 13. a second mounting plate; 131. a T-shaped groove; 132. a fixing groove; 2. an acceleration sensor; 3. a signal collector; 4. a terminal computer; 5. an excitation applying module; 51. a force hammer; 52. a bracket; 53. a magnetic switch.
Detailed Description
The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," and the like as used herein indicate an orientation or positional relationship based on that shown in the drawings, merely for convenience in describing the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
As shown in fig. 1 and 2, an embodiment of the present utility model proposes an abnormal sound performance evaluation device, including:
a fixing device 1, wherein the fixing device 1 is provided with a mounting position 11 for mounting a part to be tested;
an acceleration sensor 2, wherein the acceleration sensor 2 is used for being installed on the outer surface of a measured part;
the signal collector 3 is electrically connected with the acceleration sensor 2;
the terminal computer 4 is electrically connected with the signal collector 3; and
the excitation applying module 5 is electrically connected with the signal collector 3, the excitation applying module 5 is arranged close to the installation position 11, and the excitation applying module 5 is used for knocking a part to be tested.
Based on the technical scheme, the abnormal sound performance evaluation device and the abnormal sound performance evaluation method are characterized in that the measured part is arranged on the installation position 11 of the fixing device 1, the acceleration sensor 2 can sense the knocking acceleration signal applied by the excitation applying module 5, the signal collector 3 transmits the force signal and the acceleration signal to the terminal computer 4, further the acceleration-time curve is obtained through analysis, according to the acceleration-time curve, the higher the amplitude attenuation is in the same time, the higher the internal consumption of the material is, the better the damping noise reduction effect is, the abnormal sound performance evaluation is convenient and visual, the whole structure of the device is simple, the cost is low, compared with the traditional microphone collecting noise, the error caused by the environment noise background can be greatly reduced, compared with the noise generated by the motion between different parts measured by a friction method, more using conditions such as noise generated by the vibration of the parts per se caused by external excitation can be met, and the abnormal sound condition under the conditions can be obtained through better detection and analysis.
In some embodiments of the present utility model, as shown in fig. 1-4, the fixing device 1 includes a first mounting plate 12 and a second mounting plate 13, the mounting location 11 is disposed above the first mounting plate 12, a plurality of T-shaped slots 131 are disposed at the top of the second mounting plate 13 at uniform intervals, the first mounting plate 12 is connected to the top of the second mounting plate 13, and the first mounting plate 12 is detachably mounted on the T-shaped slots 131. The mounting position 11 on the first mounting plate 12 can be used for mounting the measured part, and as the top of the second mounting plate 13 is provided with a plurality of T-shaped grooves 131 which are arranged at intervals, the first mounting plate 12 can be flexibly switched in size and position, so that the abnormal sound performance evaluation requirements under different sizes and different use conditions are met.
Specifically, as shown in fig. 1-3, the first mounting plate 12 includes a first plate body 121 and a plurality of first bolts 122, the mounting position 11 is disposed above the first plate body 121, the first plate body 121 is provided with a plurality of mounting holes 123 that are vertically penetrated, and the first bolts 122 pass through the mounting holes 123 and are mounted on the T-shaped slots 131. The first mounting plate 12 is connected with the second mounting plate 13 through the first bolts 122, the number of the first bolts 122 is at least two, the first mounting plate 12 can be more firmly fixed on the second mounting plate 13, and the connection mode of the bolts is simple to use, easy to process and easy to obtain, so that the connection mode is the optimal connection mode for realizing detachable connection.
More specifically, as shown in fig. 1-3, the first mounting plate 12 further includes a plurality of second bolts 124, and the second bolts 124 are used to fixedly mount the part under test on the first plate body 121. The measured parts are connected by using the second bolts 124, so that the device is convenient to use and flexible to operate.
Specifically, as shown in fig. 1 and 2, a plurality of fixing grooves 132 are formed on the side wall of the second mounting plate 13. The fixing groove 132 is used for fixing the second mounting plate 13, and in the process of performing abnormal sound test, the second mounting plate 13 may not be stably placed on a plane due to different test areas or test environments, and at this time, the second mounting plate 13 can be fixed in the test areas or the environment test boxes by using the fixing groove 132, so that test tasks are completed.
In some embodiments of the present utility model, as shown in fig. 1 and 2, the excitation applying module 5 includes a force hammer 51 and a bracket 52, the force hammer 51 is electrically connected with the signal collector 3, a hammer head of the force hammer 51 is disposed near the mounting position 11, and a hammer handle of the force hammer 51 is rotatably mounted on the bracket 52. The excitation mode of the force hammer 51 and the support 52 can avoid the problem of human interference to a certain extent, if the mode of manually holding the hammer handle to strike the measured part is adopted, the acquired acceleration signals are easy to have errors due to different angles, different heights and different forces of force applied by personnel, and the hammer handle of the force hammer 51 in the scheme is rotatably arranged on the fixed support 52, so that the force hammer 51 can be released by the staff in the same height in a free falling mode, the error of force applied by the force hammer 51 is avoided, and the finally obtained abnormal sound performance evaluation is more accurate and persuasive.
Specifically, as shown in fig. 1 and 2, the excitation applying module 5 further includes a magnetic switch 53, and the force hammer 51 and the bracket 52 are connected by the magnetic switch 53. The magnetic switch 53 enables the force hammer 51 and the support 52 to fix their relative positions through magnetic force, when the magnetic switch 53 is turned on, magnetic force exists between the force hammer 51 and the support 52, the force hammer 51 is fixed at a specific position under the influence of the magnetic force, when the magnetic switch 53 is turned off, the force hammer 51 is influenced by gravity due to the fact that the magnetic force between the force hammer 51 and the support 52 disappears, the hammer head naturally falls down to strike a measured part, accordingly, one-time strike data are obtained, multiple-time strike can be achieved by repeatedly switching on and off the magnetic switch 53, and multiple-time strike data are obtained. Meanwhile, the manual error can be completely eliminated by adopting the magnetic switch 53, and a worker only needs to operate the magnetic switch 53, so that the error is smaller and more accurate.
As shown in fig. 1 and 2, an embodiment of the present utility model proposes an abnormal sound performance evaluation method, using the abnormal sound performance evaluation device described above, including:
mounting a part to be measured on the mounting position 11, and mounting the acceleration sensor 2 on the part to be measured;
operating the excitation applying module 5 to strike the tested part, and transmitting the force signal of the excitation applying module 5 detected by the signal collector 3 to the terminal computer 4;
transmitting the acceleration signal of the acceleration sensor 2 detected by the signal collector 3 to the terminal computer 4;
the terminal computer 4 processes the force signal and the acceleration signal to obtain an acceleration-time curve, and the abnormal sound performance is evaluated by using the acceleration-time curve.
In some embodiments of the present utility model, the acceleration signal includes a first direction signal, a second direction signal and a third direction signal that are perpendicular to each other, and the process of processing the acceleration signal by the terminal computer 4 includes:
and carrying out Fourier transform analysis on the first direction signal, the second direction signal and the third direction signal, and converting the frequency domain information into time domain information.
In the preferred embodiments of the abnormal sound performance evaluation device and the method thereof described herein, as shown in fig. 1-4, the measured part is a product with an inner cavity structure, the length is 120mm, the width is 60mm, the height is 35mm, the product is used for simulating the inner cavity structure, four Zhou You mm round holes are formed in the first plate 121, the measured part is rigidly fixed on the first plate 121 through the second bolts 124, so that test errors caused by movement of the part are reduced, and in order to reduce the problems of internal stress, poor air exhaust and the like in the injection molding process of the part, a radius chamfer of 8mm is arranged on the peripheral surface of the part. After the part is fixed on the first plate body 121, the first plate body 121 is fixed on the second plate body through the first bolt 122, the first bolt 122 is fixedly connected with the T-shaped groove 131 on the second plate body, and the whole second plate body can be integrated into an environment test box for evaluating abnormal sound under the conditions of high temperature, low temperature and certain humidity. After the installation is completed, the terminal computer 4 is started, the exciting signals are applied to the parts by the hammer 51, and the hammerheads of the hammer 51 have different weights so as to obtain the exciting signals with different energy magnitudes, so that a wider or narrower frequency spectrum can be excited. Before excitation is applied, a triaxial acceleration sensor 2 is stuck above a sample, when a force hammer 51 strikes a part model, vibration of the part model structure is caused, response signals in the three directions X, Y and Z are transmitted to a signal collector 3 by the triaxial acceleration sensor 2 arranged in a part model detection area, on the other hand, excitation signals of the force hammer 51 are also transmitted to the signal collector 3 through a charge amplifier, and finally, the excitation signals and the response signals struck by the force hammer 51 are stored in a computer. The software module mainly sets channel parameters of the force hammer 51 and the acceleration sensor 2, and selects a triggering channel as continuous triggering. The sampling frequency is set to 48kHz, the refreshing frequency is 2Hz, a control mode of the multi-trace oscillography is selected, input1 is a force signal (force/N-time/s curve), input2 is an acceleration X-direction signal (frequency/Hz-amplitude/g curve), input3 is an acceleration Y-direction signal (frequency/Hz-amplitude/g curve), and input4 is an acceleration Z-direction signal (frequency/Hz-amplitude/g curve). The data are processed by the data processing module, mainly, the result obtained by testing the acceleration X direction in input2 and the acceleration Y direction in input3 and the acceleration Z direction in input4 is subjected to Fourier transformation analysis, and the frequency domain information is converted into time domain information, so that the (time/s-amplitude/g curve) of the acceleration X direction in input2, the acceleration Y direction in input3 and the acceleration Z direction in input4 is obtained. According to the curve of acceleration-time, the faster the amplitude decays in the same time, the larger the internal consumption of the material, and the better the damping and noise reduction effects. As shown in fig. 5 and 6, the test results of the abnormal sound performance evaluation and the method of the present utility model are schematic diagrams of the common material and the abnormal sound resistant material, it can be obviously seen that compared with the common material, the abnormal sound resistant material has higher internal consumption due to the higher internal consumption and better damping and noise reduction effects due to the fact that the damping performance is improved and the energy generated by extrusion friction is converted into more internal energy in the formula design, thereby reducing the sound emission.
In summary, according to the abnormal sound performance evaluation device disclosed by the utility model, the measured part is arranged on the mounting position 11 of the fixing device 1, the acceleration sensor 2 can sense the knocking acceleration signal applied by the excitation application module 5, and the signal collector 3 transmits the force signal and the acceleration signal to the terminal computer 4, so that an acceleration-time curve is obtained through analysis, according to the acceleration-time curve, the higher the amplitude attenuation is in the same time, the larger the internal consumption of the material is, the better the damping noise reduction effect is, the abnormal sound performance evaluation is convenient and visual, the whole structure of the device is simple, the cost is low, compared with the traditional microphone, the error caused by the environmental noise background can be greatly reduced, and compared with the noise generated by the motion between different parts measured by a friction method, more using conditions such as noise generated by the vibration of the parts per se caused by external excitation can be met, and the abnormal sound condition under the conditions can be obtained through better detection and analysis.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.
Claims (7)
1. An abnormal sound performance evaluation device, comprising:
a fixing device (1), wherein the fixing device (1) is provided with a mounting position (11) for mounting a tested part;
the acceleration sensor (2) is used for being mounted on the outer surface of the measured part;
the signal collector (3) is electrically connected with the acceleration sensor (2);
the terminal computer (4) is electrically connected with the signal collector (3); and
the excitation applying module (5), the excitation applying module (5) is electrically connected with the signal collector (3), the excitation applying module (5) is close to the installation position (11), and the excitation applying module (5) is used for knocking a part to be tested.
2. The abnormal sound performance evaluation device according to claim 1, wherein the fixing device (1) comprises a first mounting plate (12) and a second mounting plate (13), the mounting position (11) is arranged above the first mounting plate (12), a plurality of T-shaped grooves (131) which are uniformly arranged at intervals are formed in the top of the second mounting plate (13), the first mounting plate (12) is connected to the top of the second mounting plate (13), and the first mounting plate (12) is detachably mounted on the T-shaped grooves (131).
3. The abnormal sound performance evaluation device according to claim 2, wherein the first mounting plate (12) comprises a first plate body (121) and a plurality of first bolts (122), the mounting position (11) is arranged above the first plate body (121), the first plate body (121) is provided with a plurality of mounting holes (123) penetrating up and down, and the first bolts (122) are mounted on the T-shaped grooves (131) through the mounting holes (123).
4. The abnormal sound performance evaluation device according to claim 3, wherein the first mounting plate (12) further comprises a plurality of second bolts (124), the second bolts (124) being for fixedly mounting the part under test on the first plate body (121).
5. The abnormal sound performance evaluation device according to claim 2, wherein a plurality of fixing grooves (132) are formed in the side wall of the second mounting plate (13).
6. The abnormal sound performance evaluation device according to claim 1, wherein the excitation applying module (5) includes a force hammer (51) and a bracket (52), the force hammer (51) is electrically connected with the signal collector (3), a hammer head of the force hammer (51) is arranged near the mounting position (11), and a hammer handle of the force hammer (51) is rotatably mounted on the bracket (52).
7. The abnormal sound performance evaluation device according to claim 6, wherein the excitation applying module (5) further includes a magnetic switch (53), and the force hammer (51) and the bracket (52) are connected through the magnetic switch (53).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320777099.0U CN219996486U (en) | 2023-04-10 | 2023-04-10 | Abnormal sound performance evaluation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320777099.0U CN219996486U (en) | 2023-04-10 | 2023-04-10 | Abnormal sound performance evaluation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219996486U true CN219996486U (en) | 2023-11-10 |
Family
ID=88612434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320777099.0U Active CN219996486U (en) | 2023-04-10 | 2023-04-10 | Abnormal sound performance evaluation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219996486U (en) |
-
2023
- 2023-04-10 CN CN202320777099.0U patent/CN219996486U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6880403B1 (en) | Structure inspection device | |
| CN201945429U (en) | Device for analyzing vibration characteristic of wind turbine blade | |
| US5029474A (en) | Transducer and method for acoustic emission (AE) testing | |
| CN104833412A (en) | Noise vibration testing device for portable transformer | |
| CN219996486U (en) | Abnormal sound performance evaluation device | |
| CN109141821B (en) | Ship body model dry mode measuring device and measuring method thereof | |
| CN107702990B (en) | Acoustic emission extensometer and test method thereof | |
| JPS63186122A (en) | Abnormality diagnosing system for structure | |
| CN211013996U (en) | Laser film internal consumption instrument | |
| CN210398207U (en) | Fixing device of measuring instrument | |
| CN109900790B (en) | Composite material dynamic fatigue test device and method based on reverse resonance | |
| CN216283546U (en) | Hemisphere harmonic oscillator hits shake device in vacuum environment | |
| CN205175696U (en) | Measurement device for be used for aeroengine structure spare natural frequency | |
| CN206757054U (en) | A kind of face ripple pick-up sensor and face ripple detecting system | |
| CN212110560U (en) | Stator blade natural frequency detection device under complicated path | |
| CN220419118U (en) | Acoustic vibration control material damping performance testing device based on resonance method | |
| CN107941526A (en) | A kind of automobile instrument disc assembly abnormal sound detection device for assembly line | |
| CN105716973A (en) | Vibration test device and method of vibration-absorbing material | |
| CN208270065U (en) | A kind of practical gas turbine Vibration-Measuring System | |
| CN207472381U (en) | A kind of ultrasonic intelligent device applied to the detection of self-service rice mill granary paddy position | |
| Iqbal et al. | Performance Evaluation of Low-Cost Vibration Sensors in Industrial IoT Applications | |
| CN220913019U (en) | Laser crack sensor and early warning device of vibrating screen vibration exciter | |
| CN110865207A (en) | On-site calibration device of vibration acceleration monitoring equipment of ocean platform structure | |
| CN220207641U (en) | Real-time automobile acceleration detection device | |
| CN204575191U (en) | Portable transformer noise and vibration proving installation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |