CN107192562B - Quick positioning and diagnosis test device for abnormal sound fault of shock absorber - Google Patents

Quick positioning and diagnosis test device for abnormal sound fault of shock absorber Download PDF

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Publication number
CN107192562B
CN107192562B CN201710423402.6A CN201710423402A CN107192562B CN 107192562 B CN107192562 B CN 107192562B CN 201710423402 A CN201710423402 A CN 201710423402A CN 107192562 B CN107192562 B CN 107192562B
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CN
China
Prior art keywords
shock absorber
sound
test
slide rail
support
Prior art date
Application number
CN201710423402.6A
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Chinese (zh)
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CN107192562A (en
Inventor
刘清河
赵立军
马琮淦
李国华
侯平
何平
Original Assignee
哈尔滨工业大学(威海)
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Application filed by 哈尔滨工业大学(威海) filed Critical 哈尔滨工业大学(威海)
Priority to CN201710423402.6A priority Critical patent/CN107192562B/en
Publication of CN107192562A publication Critical patent/CN107192562A/en
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Publication of CN107192562B publication Critical patent/CN107192562B/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00Testing of vehicles
    • G01M17/007Wheeled or endless-tracked vehicles
    • G01M17/04Suspension or damping

Abstract

The invention relates to a test device for quickly positioning and diagnosing abnormal sound faults of a shock absorber, which is characterized in that a test board is provided with a support for fixing the shock absorber to be tested, a vibration exciter is arranged below the test board, the support comprises four supporting rods and a top plate, four corners of the top plate are fixed on a table board of the test board through the four supporting rods, the bottom surface of the top plate is provided with a shock absorber mounting upper support, the shock absorber to be tested is connected with the shock absorber mounting upper support, and the lower end of the shock absorber to be tested is provided with; the test bench is also provided with a sound sensor slide rail mechanism, the sound sensor slide rail mechanism comprises a vertical slide rail and a horizontal slide rail fixed on the table surface of the test bench, wherein the bottom of the vertical slide rail is connected with the horizontal slide rail through a slide block, and the sound sensor, the vibration acceleration sensor, the digital camera and the test control and data acquisition instrument are also arranged.

Description

Quick positioning and diagnosis test device for abnormal sound fault of shock absorber

The technical field is as follows:

the invention relates to the technical field of abnormal sound fault positioning and diagnosis of a shock absorber product, in particular to a shock absorber abnormal sound fault rapid positioning and diagnosis test device which aims at abnormal sound faults generated in the using and production processes of a vehicle shock absorber product, performs lifting imaging and rapid abnormal sound positioning through the cooperation of a single sound sensor and a digital camera, and diagnoses fault reasons through an acceleration sensor.

Background art:

the shock absorber is an important part which is frequently used by various vehicles and used for absorbing mechanical vibration and ensuring the smoothness and comfort of vehicle running. The shock absorbing function of the shock absorber is generally achieved by a damping action resulting from the rapid circulation of the damping fluid through the valve body. When the vibration reduction liquid flows in each valve body of the vibration reducer, the kinetic energy of the liquid is converted into heat energy under the damping action generated by the valve bodies, so that the vibration energy is absorbed, and the vibration reduction effect is achieved. Therefore, the shock absorber product belongs to a mechanical and hydraulic integrated product, and has high product design difficulty and high technical content.

In the shock absorber products widely adopted in the automobile industry at present, abnormal sound faults are prominent fault forms, and through market research, complaints of the abnormal sound faults account for more than 70% of complaints of all users. The diagnosis of the cause of the abnormal sound fault of the shock absorber is a very complicated work, which is not only related to the states of a valve body part, a damping liquid, a shock absorber spring, a shock absorber rubber seat sleeve, a shock absorber mounting bolt and the like of the shock absorber, but also has a coupling effect on the unevenness of a road surface on which a vehicle runs, the transmission characteristic of tires, the modal characteristics of a vehicle chassis and a vehicle body covering part, and even the vibration and the transmission characteristic of a power system of the vehicle, so that the judgment of the cause of the abnormal sound fault is very complicated, and a large amount of sensor data and deep theoretical analysis are required. Meanwhile, the abnormal sound fault of the shock absorber has a plurality of expression forms, various sounds such as 'si', 'guru', 'hull' and 'creaky' exist in terms of sound, the positions of the generated sounds are greatly different, and the reasons for generating different sounds are greatly different.

Most of the current shock absorber test beds basically have 2 types, namely a shock absorber performance test bed which has the function of measuring an indicator diagram curve and performance indexes of a shock absorber; and the other is a shock absorber reliability test bed which has the function of testing the service life and the reliability of the shock absorber. For the diagnosis of abnormal sound faults of the shock absorber, basically, the performance test bed of the shock absorber is still relied on, and the fault reason of the shock absorber is judged according to the performance difference between the shock absorber with abnormal sound faults and the shock absorber without faults. However, this approach presents a number of technical hurdles, such as: (1) the testing method of the performance test bed is generally fixed, abnormal sound faults can not be reproduced sometimes, and performance change can not be measured; (2) even if the performance detection finds the deviation, the reason causing the performance deviation is difficult to judge; (3) the location of the occurrence of the fault cannot be quickly found through the performance deviation.

The invention content is as follows:

aiming at the defects and shortcomings in the prior art, the invention provides a vibration damper abnormal sound fault rapid positioning and diagnosis test device and a method, wherein the vibration damper abnormal sound fault rapid positioning and diagnosis test device and method are used for performing upgradable imaging and rapid abnormal sound positioning through the matching of a single sound sensor and a digital camera and diagnosing the fault reason through an acceleration sensor.

The invention is achieved by the following measures:

a test device for quickly positioning and diagnosing abnormal sound faults of a shock absorber is provided with a test board, and is characterized in that a support for fixing the shock absorber to be tested is arranged on the test board, a vibration exciter is arranged below the test board, the support comprises four supporting rods and a top plate, four corners of the top plate are fixed on a table board of the test board through the four supporting rods, a shock absorber mounting upper support is arranged on the bottom surface of the top plate, the shock absorber to be tested is connected with the shock absorber mounting upper support, and a shock absorber mounting lower swing arm is arranged at the; still be equipped with sound sensor slide rail mechanism on the testboard, sound sensor slide rail mechanism includes perpendicular slide rail and fixes the horizontal slide rail on the testboard mesa, wherein the bottom of perpendicular slide rail is connected with horizontal slide rail through the slider, still be equipped with sound sensor, vibration acceleration sensor, digital camera and test control and data acquisition appearance, wherein sound sensor is connected with perpendicular slide rail through the slider, vibration acceleration sensor arranges in on the shock absorber body that awaits measuring, digital camera fixes on the support, sound sensor, vibration acceleration sensor, digital camera is connected with test control and data acquisition appearance respectively.

The invention is provided with three vibration acceleration sensors which are respectively positioned at the upper part, the middle part and the lower part of the vibration damper body to be measured.

The test control and data acquisition instrument of the invention adopts the existing detection instrument.

In the using process, the movable sound sensor is matched with the fixed digital camera, and the upper acceleration sensor, the middle acceleration sensor and the lower acceleration sensor are used for measuring vibration signals, so that the quick positioning of abnormal sound faults of the shock absorber and the diagnosis of abnormal sound reasons can be completed; the mounting bracket on the shock absorber can be adjusted left and right through the guide rail, so that the mounting angle of the shock absorber can be adjusted; the lower end of the shock absorber is arranged on the lower swing arm, and the real installation form of the shock absorber on the vehicle can be simulated through the geometric dimension of the lower swing arm; through the vertical and horizontal sliding rails of the sound sensor, the sound sensor is moved to measure abnormal sound of the vibration absorber during vibration, and the fixed digital camera is matched to obtain all sound information in the range of the moving plane of the sound sensor, so that acoustic imaging is carried out, and the fault point of the abnormal sound is quickly positioned; acceleration signals of the vibration damper in a vibration state are measured through the vibration acceleration sensors at the upper part, the middle part and the lower part, and fault location information of acoustic imaging is combined to realize rapid diagnosis of fault reasons.

Description of the drawings:

FIG. 1 is a schematic structural diagram of the present invention.

Reference numerals: the device comprises a test board 1, a support 2, a vibration exciter 3, a vibration absorber mounting upper support 4, a vibration absorber 5 to be tested, a vibration absorber mounting lower swing arm 6, a vertical slide rail 7, a horizontal slide rail 8, a sound sensor 9, a vibration acceleration sensor 10, a digital camera 11 and a test control and data acquisition instrument 12.

The specific implementation mode is as follows:

the invention will be further described with reference to the accompanying drawings.

The invention provides a test device for quickly positioning and diagnosing abnormal sound faults of a shock absorber, which is provided with a test board 1 and is characterized in that a support 2 for fixing the shock absorber to be tested is arranged on the test board 1, a vibration exciter 3 is arranged below the test board 1, the support 2 comprises four supporting rods and a top plate, four corners of the top plate are fixed on the table surface of the test board 1 through the four supporting rods, an upper shock absorber mounting support 4 is arranged on the bottom surface of the top plate, the shock absorber 5 to be tested is connected with the upper shock absorber mounting support 4, and a lower shock absorber mounting swing arm 6 is arranged at the lower end of the shock; still be equipped with sound sensor slide rail mechanism on testboard 1, sound sensor slide rail mechanism includes perpendicular slide rail 7 and fixes the horizontal slide rail 8 on the testboard mesa, wherein the bottom of perpendicular slide rail 7 is connected with horizontal slide rail 8 through the slider, still be equipped with sound sensor 9, vibration acceleration sensor 10, digital camera 11 and experimental control and data acquisition instrument 12, wherein sound sensor 9 is connected with perpendicular slide rail 7 through the slider, vibration acceleration sensor 10 is arranged in on the 5 bodies of shock absorber that awaits measuring, digital camera 11 is fixed on support 2, sound sensor 9, vibration acceleration sensor 10, digital camera 11 is connected with experimental control and data acquisition instrument 12 respectively.

The invention is provided with three vibration acceleration sensors which are respectively positioned at the upper, middle and lower parts of the body of the vibration damper 5 to be measured.

In order to ensure that the tested shock absorber can truly reproduce abnormal sound faults generated when the tested shock absorber is used on a vehicle in a test system as far as possible, the test platform of the test system is novel and specially designed on the installation of the shock absorber and the arrangement of an excitation source. As shown in fig. 1, firstly, the upper mounting rack of the shock absorber can be adjusted left and right on the slide rail at the top of the shock absorber test platform, so that the mounting angle of the shock absorber can be conveniently adjusted. And the lower mounting frame of the shock absorber is arranged on a lower swing arm to simulate a cross arm on a vehicle. And thirdly, the excitation point of the excitation source acts on the lower swing arm. Through the design of the three aspects, the working state of the shock absorber on the test platform is completely the same as that of the vehicle.

In order to realize the quick diagnosis of the abnormal sound fault of the shock absorber, the quick positioning of the abnormal sound source is one of the important means of the invention. The invention adopts a single sound sensor, the sound sensor is arranged on a sliding rail which can move vertically and horizontally, and the sound sensor can sweep the plane near the whole shock absorber through the movement of the sliding rail. And when the sound sensor sweeps and collects abnormal sound information, the digital camera is adopted to record the image information of the whole collection process. And finally, synthesizing the sound information and the image information to obtain the sound field information in the whole sound acquisition plane. The specific position of the abnormal sound is obtained through processing and analyzing the sound field information, and the positioning precision can reach within 5 mm. The abnormal sound source positioning method is high in abnormal sound source positioning speed and accuracy, and can provide important fault source information for subsequent fault diagnosis.

The collection of sound information is easily influenced by the environment, the signal-to-noise ratio is low, and meanwhile, the fault of the shock absorber sometimes cannot realize the reproduction of abnormal sound under the laboratory environment. Therefore, the vibration detection method adopts three acceleration sensors to respectively measure vibration signals at the upper end, the middle end and the lower end of the vibration absorber, obtains the specific characteristics of the vibration absorber fault through the vibration signals, and carries out detailed diagnosis on the vibration absorber fault reason through extracting the characteristics.

In order to enable the vibration absorber fault diagnosis test system to truly reproduce the fault of the vibration absorber in vehicle use as far as possible, the vibration absorber mounting cross arm is excited by adopting a numerical control vibration exciter. The excitation frequency spectrum adopts the real vehicle collection frequency spectrum when abnormal sound faults of the vehicle shock absorber occur. Therefore, the test platform can truly simulate the real use condition of the shock absorber, which is an important basis for realizing accurate diagnosis success on the shock absorber fault.

Claims (2)

1. A test device for quickly positioning and diagnosing abnormal sound faults of a shock absorber is provided with a test board, and is characterized in that a support for fixing the shock absorber to be tested is arranged on the test board, a vibration exciter is arranged below the test board, the support comprises four supporting rods and a top plate, four corners of the top plate are fixed on a table board of the test board through the four supporting rods, a shock absorber mounting upper support is arranged on the bottom surface of the top plate, the shock absorber to be tested is connected with the shock absorber mounting upper support, and a shock absorber mounting lower swing arm is arranged at the; the test bench is also provided with a sound sensor slide rail mechanism, the sound sensor slide rail mechanism comprises a vertical slide rail and a horizontal slide rail fixed on the table top of the test bench, the bottom of the vertical slide rail is connected with the horizontal slide rail through a slide block, the sound sensor, a vibration acceleration sensor, a digital camera and a test control and data acquisition instrument are also arranged, the sound sensor is connected with the vertical slide rail through the slide block, the vibration acceleration sensor is arranged on the body of the shock absorber to be tested, the digital camera is fixed on the support, and the sound sensor, the vibration acceleration sensor and the digital camera are respectively connected with the test control and data acquisition instrument; the sound sensor scans and collects abnormal sound information, at the same time, a digital camera is adopted to record image information in the whole collection process, finally sound field information in the whole sound collection plane is obtained through synthesis of the sound information and the image information, and the specific position of the abnormal sound is obtained through processing and analyzing the sound field information.
2. The test device for rapidly positioning and diagnosing the abnormal sound fault of the shock absorber as claimed in claim 1, wherein three vibration acceleration sensors are respectively positioned at the upper, middle and lower parts of the shock absorber body to be tested.
CN201710423402.6A 2017-06-07 2017-06-07 Quick positioning and diagnosis test device for abnormal sound fault of shock absorber CN107192562B (en)

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CN109211594A (en) * 2018-09-18 2019-01-15 苏州道捷电子科技有限公司 A kind of automobile absorber test device
CN109632348A (en) * 2018-12-27 2019-04-16 大乘汽车有限公司 Damper abnormal sound test-bed

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