CN107144435B - A kind of dynamic vibration absorber frequency test method - Google Patents
A kind of dynamic vibration absorber frequency test method Download PDFInfo
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- CN107144435B CN107144435B CN201710398240.5A CN201710398240A CN107144435B CN 107144435 B CN107144435 B CN 107144435B CN 201710398240 A CN201710398240 A CN 201710398240A CN 107144435 B CN107144435 B CN 107144435B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/04—Suspension or damping
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/12—Measuring characteristics of vibrations in solids by using direct conduction to the detector of longitudinal or not specified vibrations
- G01H1/14—Frequency
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Abstract
The present invention relates to auto NVH fields, and in particular to a kind of dynamic vibration absorber frequency test method, the boundary condition to be worked by the dynamic vibration absorber on bench simulation vehicle, i.e. temperature and exciting force obtain accurate bump leveller frequency；The processing of point layout and data to the test of rack vibration excitor；To dynamic vibration absorber frequency modulation(PFM)；The verifying of dynamic vibration absorber frequency accuracy.The beneficial effects of the present invention are: 1, the invention proposes the boundary condition that influences dynamic vibration absorber absorbing frequency: exciting force size and operating temperature；2, the frequency that dynamic vibration absorber is tested out by simulating the boundary condition of dynamic vibration absorber, the dynamic vibration absorber for meeting frequency needs can be debugged out using simple intrinsic frequency theoretical formula；3, the time cycle that automobile main frame maker manufactures experimently dynamic vibration absorber and develops can be shortened, improve dynamic vibration absorber efficiency of research and development.
Description
Technical field
The present invention relates to auto NVH fields, and in particular to a kind of dynamic vibration absorber frequency test method.
Background technique
As automobile main frame maker continues to optimize to what the control of whole tightness index and acoustics were wrapped up, high-frequency noises are obtained
It to good control and reduces, the vehicle problem of thundering caused by power drive system low-frequency resonance becomes increasingly to highlight, therefore
It solves the problems, such as that vehicle caused by power drive system low-frequency resonance thunders to become more and more important.Automobile main frame maker solves to be somebody's turn to do at present
There are two the method for problem is main: method is first is that optimization causes the system or component structural of this low-frequency resonance, inherently by it
Frequency separation avoids resonating；Method is second is that designing the identical dynamic vibration absorber of an intrinsic frequency and being rigidly attached to the system
Or on components, passive energy-obsorbing and damping is achieved the purpose that with this, to reduce thundering for low-frequency resonance generation.The above method one by
In needing to redesign powerdriven a certain system, consider for design cost and time cycle, main engine plants will not generally spend
Huge fund and time go the structure of optimization power drive system.Compared to method one, method two only increases by one on original structure and moves
Power bump leveller, this method has many advantages, such as that structure is simple, expense is small, the period is short, therefore this method is that main engine plants commonly optimize
Technology.System frequency calculation formula:
Note:System frequency is represented, K represents system stiffness, refers to that rubber is rigid for dynamic vibration absorber
Degree, what m was represented is mass of system.
In order to debug the dynamic vibration absorber for meeting frequency requirement, reduces low frequency and thunder, accurate test method is needed to survey
The frequency of examination and debugging dynamic vibration absorber.
The country lacks the test of power drive system dynamic vibration absorber frequency and debugging technique simple and accurate at present
Experimental method.Main difficult point includes: first is that the key factor for influencing dynamic vibration absorber frequency size can not accurately be grasped, in turn
Key parameter is unable to control to simulate the work boundary condition of dynamic vibration absorber, leads to dynamic vibration absorber test method and debugging skill
Art is immature；In addition, tester is often solely focused on the frequency response of dynamic vibration absorber to the analysis of test data there are one-sidedness
Function, and be not concerned with the phase relation and corresponding Mode Shape of frequency response function, cause test result and actual frequency deviation compared with
Greatly.
Saic Motor Corporation Limited grandson builds several pieces of metal plates, two installations bolts and elastic rubber etc. such as happiness
Basic material designs the dynamic vibration absorber of a adjustable frequency, its advantages using the characteristic of installation bolt changeable quality
It is within the scope of certain frequency, user can adjust bump leveller frequency according to demand.But there is also the limitation of itself, the designs for it
Tooling does not consider dynamic vibration absorber operating ambient temperature and Work Incentive power size, therefore the accurate regulating cycle of bump leveller frequency
It is longer.
Chongqing Chang'an Automobile Co., Ltd, which is permitted to build etc., designs one by L-type fixing bolt, fixed floor and pedestal
Money bump leveller frock clamp, and the method for test bump leveller frequency is provided on its frock clamp.The advantages of device itself is
Structure is simple, convenient for being tested the installation of dynamic vibration absorber.But the test method uses traditional power to hammer test method into shape, due to
The size influence of the rubber non-linear characteristic of bump leveller, bump leveller frequency stress hammer power be can not ignore, therefore this method test knot
The repeatability of fruit is not high.And the test method does not account for influence of the temperature to rubber stiffness still, therefore the test fills
It sets and test method can not accurately test out dynamic vibration absorber frequency.
Summary of the invention
The purpose of the present invention is to solve the above problem, provides a kind of dynamic vibration absorber frequency test method.
In order to achieve the object of the present invention, the technical solution adopted by the present invention are as follows:
A kind of dynamic vibration absorber frequency test method, characterization step are as follows:
Step 1: the perimeter strip to be worked by the dynamic vibration absorber on dynamic vibration absorber mould measurement bench simulation vehicle
Part, including temperature and exciting force test out its synthesis frequency response function SUM on dynamic vibration absorber mould measurement rack, operation
Steps are as follows:
(1) first determine test vehicle the part position that low speed thunders is generated in power drive system, then determine this zero
The intrinsic frequency at part position will need to test to assemble at the part with the dynamic vibration absorber of modulation；
(2) acceleration vibrating sensor and near field temperature sensor are arranged on dynamic vibration absorber, acquire dynamic absorber
Acceleration time domain signal and near field temperature of the device in the case where low speed thunders operating condition；
(3) by dynamic vibration absorber from dismantling and be put into insulating box on vehicle, setting calorstat temperature and low speed thunder work
The near field temperature of dynamic vibration absorber under condition is consistent, keeps dynamic vibration absorber 3 hours or more in insulating box；
(4) dynamic vibration absorber in insulating box is placed on dynamic vibration absorber mould measurement rack, keeps dynamic vibration absorber
Temperature near field temperature corresponding with vehicle is consistent, and several acceleration vibrating sensors are arranged on dynamic vibration absorber, use vibration excitor
Exciting force size of the dynamic vibration absorber under vehicle assembled state is simulated, so that the power on dynamic vibration absorber mould measurement rack
The vibration acceleration time-domain signal of bump leveller is consistent on vehicle, obtains comprehensive frequency response function SUM；
Step 2: by comprehensive frequency response function SUM and acceleration vibrating sensor in the frequency response function FRF of measuring point and survey
The corresponding phase relation of point, it is accurate to calculate dynamic vibration absorber using the PolyMax module in the Test.Lab software of LMS company
Frequency and the corresponding vibration shape；
Step 3: (1) according to intrinsic frequency calculation formula:, wherein f0It is intrinsic frequency, K is rigid
Degree, m is quality；Dynamic vibration absorber is modulated, i.e., under the premise of dynamic vibration absorber system stiffness K is remained unchanged, to dynamic
The quality m of power bump leveller is increased and decreased, to realize the intrinsic frequency f of dynamic vibration absorber0Change；
(2) (3) and (4) in step 1 are repeated, modal frequency test are carried out to modulated dynamic vibration absorber, verifying is adjusted
Whether the intrinsic frequency of the dynamic vibration absorber after system is consistent with the part position intrinsic frequency that low speed thunders is generated；
Step 4: to the accuracy validation of modulated dynamic vibration absorber frequency
The dynamic vibration absorber modulated is installed on vehicle and carries out compliance test result, is inhaled power is installed under whole vehicle state
Vehicle noise and vibration comparison before and after vibration device, verifies whether modulated bump leveller reaches the effect that reduction vehicle low frequency thunders
Fruit.
The beneficial effects of the present invention are: 1, the invention proposes the boundary condition that influences dynamic vibration absorber absorbing frequency:
Exciting force size and operating temperature；2, the frequency that dynamic vibration absorber is tested out by simulating the boundary condition of dynamic vibration absorber, is answered
The dynamic vibration absorber for meeting frequency needs can be debugged out with simple intrinsic frequency theoretical formula；3, automobile main frame maker can be shortened
Time cycle with exploitation is manufactured experimently to dynamic vibration absorber, improves dynamic vibration absorber efficiency of research and development.
Detailed description of the invention
Acceleration time domain signal curve of Fig. 1 dynamic vibration absorber to be modulated under problem operating condition,
Fig. 2 dynamic vibration absorber mould measurement rack schematic diagram to be modulated,
Fig. 3 vibration excitor simulates acceleration time domain signal curve of the dynamic vibration absorber to be modulated under problem operating condition,
The frequency response function FRF curve of four measuring points on Fig. 4 dynamic vibration absorber to be modulated,
The synthesis frequency response function SUM curve of four measuring points on Fig. 5 dynamic vibration absorber to be modulated,
Fig. 6 dynamic vibration absorber Mode Shape figure to be modulated,
The synthesis frequency response function SUM curve of four measuring points on the modulated dynamic vibration absorber of Fig. 7,
The modulated dynamic vibration absorber bending vibation mode picture of Fig. 8,
Dynamic vibration absorber installation front and back internal car noise sound pressure level optimizes comparison diagram on Fig. 9 vehicle,
Vehicle vibration optimization comparison diagram in dynamic vibration absorber installation front and back on Figure 10 vehicle.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples:
Embodiment: referring to Fig. 1 to Figure 10.
A kind of dynamic vibration absorber frequency test method, characterization step are as follows:
Step 1: the perimeter strip of the dynamic vibration absorber work on vehicle is simulated by dynamic vibration absorber mould measurement rack 2
Part, including temperature and exciting force test out its synthesis frequency response function SUM on dynamic vibration absorber mould measurement rack 2, operation
Steps are as follows:
(1) first determine test vehicle the part position that low speed thunders is generated in power drive system, then determine this zero
The intrinsic frequency at part position will need to test to assemble at the part with the dynamic vibration absorber 1 of modulation；
(2) acceleration vibrating sensor and near field temperature sensor are arranged on dynamic vibration absorber 1, acquire dynamic absorber
Acceleration time domain signal and near field temperature of the device 1 in the case where low speed thunders operating condition；
(3) by dynamic vibration absorber 1 from dismantling and be put into insulating box on vehicle, setting calorstat temperature and low speed thunder work
The near field temperature of dynamic vibration absorber 1 under condition is consistent, keeps dynamic vibration absorber 13 hours or more in insulating box；
(4) dynamic vibration absorber 1 in insulating box is placed on dynamic vibration absorber mould measurement rack 2, keeps dynamic absorber
Device temperature near field temperature corresponding with vehicle is consistent, and several acceleration vibrating sensors are arranged on dynamic vibration absorber 1, use exciting
Device 3 simulates exciting force size of the dynamic vibration absorber 1 under vehicle assembled state, so that on dynamic vibration absorber mould measurement rack 2
Dynamic vibration absorber 1 vibration acceleration time-domain signal it is consistent on vehicle, obtain comprehensive frequency response function SUM；
Step 2: by comprehensive frequency response function SUM and acceleration vibrating sensor in the frequency response function FRF of measuring point and survey
The corresponding phase relation of point, it is accurate to calculate dynamic vibration absorber using the PolyMax module in the Test.Lab software of LMS company
Frequency and the corresponding vibration shape；
Step 3: (1) according to intrinsic frequency calculation formula:, wherein f0It is intrinsic frequency, K is rigid
Degree, m is quality；Dynamic vibration absorber is modulated, i.e., under the premise of dynamic vibration absorber system stiffness K is remained unchanged, to dynamic
The quality m of power bump leveller is increased and decreased, to realize the intrinsic frequency f of dynamic vibration absorber0Change；
(2) (3) and (4) in step 1 are repeated, modal frequency test are carried out to modulated dynamic vibration absorber, verifying is adjusted
Whether the intrinsic frequency of the dynamic vibration absorber after system is consistent with the part position intrinsic frequency that low speed thunders is generated；
Step 4: to the accuracy validation of modulated dynamic vibration absorber frequency
The dynamic vibration absorber modulated is installed on vehicle and carries out compliance test result, is inhaled power is installed under whole vehicle state
Vehicle noise and vibration comparison before and after vibration device, verifies whether modulated bump leveller reaches the effect that reduction vehicle low frequency thunders
Fruit.
Specific implementation in more detail are as follows: by being diagnosed to the country's certain diesel oil front-engine rear-drive SUV 1560rpm problem of thundering
It was found that the problem is mainly rear driving axle system the first rank Elastic mode and Engine Excitation frequency coupled resonance, interior roar
Revolving speed 1560rpm, frequency 52Hz, it is therefore desirable to modulate the dynamic vibration absorber of a 52Hz.
Dynamic vibration absorber to be modulated is mounted on rear driving axle by bolt and is tested out this by the method for the present invention and is moved
Vibration time-domain signal of the power bump leveller on vehicle referring to attached drawing 1, and records the near field temperature of dynamic vibration absorber.Fig. 1 shows dynamic
Power bump leveller generates the magnitude of vibrations of 5g, and temperature is 40 DEG C；5g and 40 DEG C of parameter is simulated by rack vibration excitor, referring to attached
Fig. 2 and 3, and show that the bump leveller frequency to be modulated is 66Hz, FRF curve is with comprehensive frequency response function and corresponding formation referring to figure
4,5 and 6；It is obtained by intrinsic frequency calculation formula, needs to increase 2.2kg mass on existing bump leveller, so that bump leveller frequency
Rate is reduced near 52Hz；Engine bench test is carried out to the bump leveller after increase quality, test result is shown after ovennodulation, absorbing
Device frequency is reduced near 52Hz, and curve and the vibration shape are detailed in Fig. 7 and 8；The dynamic vibration absorber modulated is installed to rear driving axle
Upper progress vehicle NVH compliance test result, experimental result show that modulated 52Hz dynamic vibration absorber can optimize vehicle 1560rpm
It thunders, vehicle sound pressure level reduces 5dBA, and 2 ranks reduce 8dBA, and experimental result is referring to attached drawing 9；52Hz dynamic vibration absorber also reduces
The vibration of rear axle housing body, rear axle vibration are reduced to 0.3g by 0.9g, and vehicle vibration reduces 67%, and experimental result is referring to attached drawing
10。
What the embodiment of the present invention was announced is preferred embodiment, and however, it is not limited to this, the ordinary skill people of this field
Member, easily according to above-described embodiment, understands spirit of the invention, and make different amplification and variation, but as long as not departing from this
The spirit of invention, all within the scope of the present invention.
Claims (1)
1. a kind of dynamic vibration absorber frequency test method, characterization step are as follows:
Step 1: the boundary condition to be worked by the dynamic vibration absorber on dynamic vibration absorber mould measurement bench simulation vehicle, packet
Temperature and exciting force are included, tests out its synthesis frequency response function SUM on dynamic vibration absorber mould measurement rack, operating procedure is such as
Under:
(1) it first determines that test vehicle generates the part position that low speed thunders in power drive system, then determines the Components
The intrinsic frequency of position will need to test to assemble at the part position with the dynamic vibration absorber of modulation；
(2) arrange that acceleration vibrating sensor and near field temperature sensor, acquisition dynamic vibration absorber exist on dynamic vibration absorber
Low speed thunders acceleration time domain signal and near field temperature under operating condition；
(3) by dynamic vibration absorber from dismantling and being put into insulating box on vehicle, setting calorstat temperature and low speed thunder under operating condition
Dynamic vibration absorber near field temperature it is consistent, keep dynamic vibration absorber 3 hours or more in insulating box；
(4) dynamic vibration absorber in insulating box is placed on dynamic vibration absorber mould measurement rack, keeps dynamic vibration absorber temperature
Near field corresponding with vehicle temperature is consistent, and several acceleration vibrating sensors are arranged on dynamic vibration absorber, are simulated with vibration excitor
Exciting force size of the dynamic vibration absorber under vehicle assembled state, so that the dynamic absorber on dynamic vibration absorber mould measurement rack
The vibration acceleration time-domain signal of device is consistent on vehicle, obtains comprehensive frequency response function SUM；
Step 2: by integrating frequency response function SUM and acceleration vibrating sensor in the frequency response function FRF and measuring point pair of measuring point
The phase relation answered calculates the accurate frequency of dynamic vibration absorber using the PolyMax module in the Test.Lab software of LMS company
Rate and the corresponding vibration shape；
Step 3: (1) according to intrinsic frequency calculation formula:Wherein f0It is intrinsic frequency, K is rigidity, and m is matter
Amount；Dynamic vibration absorber is modulated, i.e., under the premise of dynamic vibration absorber system stiffness K is remained unchanged, to dynamic vibration absorber
Quality m be increased and decreased, to realize the intrinsic frequency f of dynamic vibration absorber0Change；
(2) (3) and (4) in step 1 are repeated, modal frequency test are carried out to modulated dynamic vibration absorber, after verifying modulation
Dynamic vibration absorber intrinsic frequency it is whether consistent with the part position intrinsic frequency thundered of low speed is generated；
Step 4: to the accuracy validation of modulated dynamic vibration absorber frequency, the dynamic vibration absorber modulated is installed to whole
Compliance test result is carried out on vehicle, the vehicle noise and vibration before and after the installation dynamic vibration absorber under whole vehicle state is compared, verifying is adjusted
Whether the bump leveller after system achievees the effect that reducing vehicle low frequency thunders.
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| CN108828361B (en) * | 2018-06-27 | 2020-07-07 | 哈尔滨工业大学 | Piezoelectric energy collector testing device based on dynamic vibration absorber |
| CN109578510B (en) * | 2018-12-17 | 2020-09-15 | 重庆大学 | Intelligent undamped dynamic vibration reduction system |
| CN109975001B (en) * | 2019-04-29 | 2024-04-19 | 河北工业大学 | Modal testing device and method for crankshaft torsional vibration damper |
| CN113252259A (en) * | 2021-05-21 | 2021-08-13 | 江铃汽车股份有限公司 | Rigid body modal prediction method based on cooling module shock pad compression model |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0921386A2 (en) * | 1997-12-08 | 1999-06-09 | Beissbarth GmbH | Method and device for testing of mounted shock absorbers |
| CN101871810A (en) * | 2010-06-28 | 2010-10-27 | 四川宁江山川机械有限责任公司 | Shock absorber noise detection device and method |
| CN104214262A (en) * | 2014-08-21 | 2014-12-17 | 清华大学苏州汽车研究院（相城） | Dynamic vibration absorber capable of improving NVH and matching method thereof |
| CN104358823A (en) * | 2014-09-15 | 2015-02-18 | 重庆长安汽车股份有限公司 | Method for examining accuracy of natural frequency detection equipment of damping crankshaft pulley of motor |
| CN106323651A (en) * | 2016-07-28 | 2017-01-11 | 重庆长安汽车股份有限公司 | Adjustable dynamic vibration absorber inherent frequency test bench |
-
2017
- 2017-05-31 CN CN201710398240.5A patent/CN107144435B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0921386A2 (en) * | 1997-12-08 | 1999-06-09 | Beissbarth GmbH | Method and device for testing of mounted shock absorbers |
| CN101871810A (en) * | 2010-06-28 | 2010-10-27 | 四川宁江山川机械有限责任公司 | Shock absorber noise detection device and method |
| CN104214262A (en) * | 2014-08-21 | 2014-12-17 | 清华大学苏州汽车研究院（相城） | Dynamic vibration absorber capable of improving NVH and matching method thereof |
| CN104358823A (en) * | 2014-09-15 | 2015-02-18 | 重庆长安汽车股份有限公司 | Method for examining accuracy of natural frequency detection equipment of damping crankshaft pulley of motor |
| CN106323651A (en) * | 2016-07-28 | 2017-01-11 | 重庆长安汽车股份有限公司 | Adjustable dynamic vibration absorber inherent frequency test bench |
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