CN103575382B - A kind of local mode's method of testing of automotive sheet part - Google Patents
A kind of local mode's method of testing of automotive sheet part Download PDFInfo
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- CN103575382B CN103575382B CN201310628582.3A CN201310628582A CN103575382B CN 103575382 B CN103575382 B CN 103575382B CN 201310628582 A CN201310628582 A CN 201310628582A CN 103575382 B CN103575382 B CN 103575382B
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Abstract
A kind of local mode's method of testing of automotive sheet part, it uses white noise signal as driving source, step comprises: will test sheet member and hang, select can the point of exciting test sheet member frequency response function as the best impacting point of preliminary election, connect instrument and but ask best impacting point, carry out testing and preserving test data with laser vibration measurer; Data analysis is carried out to data measured, obtains the frequency response function of sheet member, by modal idenlification, obtain the Mode Shape of test carriage external door panel.The method adopts laser vibration measurer, without the need to setting up tested object model, structural nonlinear and additional mass can be avoided the impact of measuring accuracy, saves the test duration, ensures measuring accuracy, promotes testing efficiency.
Description
Technical field
The present invention relates to automobile vibration field tests, be specifically related to local mode's method of testing of automotive sheet part.
Background technology
A lot of sheet member on automobile, as door skin, side wall outer panel of automobile body, body front panel, vehicle body ceiling, they are generally walled metallic structure.The vibration noise relation of they and vehicle is very close.For door skin, on the one hand, in vehicle travel process, door skin is subject to, from the excitation of engine, road surface and suspension, causing door skin to vibrate, and causes, because door skin vibration is to passenger cabin radiated noise, causing in-vehicle sound quality to be deteriorated; On the other hand, car door is in opening and closing process, and especially in closing of the door situation, door skin is subject to severe impact, causes car door sound quality variation.
By the local mode of testing automobile car door door skin when free state, for the larger position of door skin distortion, reinforced rubber sheet or the self-adhering-type damp film of choosing appropriate size are pasted.Not only effectively can suppress the vibration of door skin and reduce radiated sound in car, and door skin trembling when closing can be reduced, thus optimize and promote car door sound quality parameter.
At present, the method for testing of testing free state exit door outside plate local mode is power hammer advocate approach.When application of force hammer advocate approach carries out mould measurement to door skin, on the one hand, door skin is metal foil wall pieces, is nonlinear system; On the other hand, the sensor that door skin is pasted can cause additional mass, and measuring accuracy error all can be caused to become large.Therefore, this patent adopts laser vibration measurer to carry out mould measurement to door skin.
Summary of the invention
The invention provides a kind of mode testing method of automotive sheet part, object evades prior art Problems existing, ensure measuring accuracy, instruct thus and determine reinforced rubber sheet and the best paste position of self-adhering-type damp film in the sheet member such as door skin, reduce the sound quality that sheet member vibrates radiated noise and the lifting vehicle caused.
Technical scheme of the present invention is as follows:
Local mode's method of testing of automotive sheet part, described method of testing uses white noise signal as driving source, and concrete steps are as follows:
Step 1: simulation " freely-freely " boundary condition, horizontally suspends on suspension bracket by test sheet member rubber rope;
Step 2: select several impacting point to carry out trial test, repeatedly debug, select can the point of exciting test sheet member frequency response function as the best impacting point of preliminary election, the usual local stiffness in this position is higher;
Step 3: computer, multi-channel vibration noise test macro, power amplifier and vibrator cable are connected, the best impacting point of preliminary election is verified, choosing white noise is input signal, regulating power amplifier controls vibrator, if from the point of the best impacting point farthest of preliminary election, test sheet member can feel that test sheet member is in vibration, illustrate that exciting force has the mode of enough energy excitation test sheet member, then this point is best impacting point, if can not, then return step 2 and reselect;
Step 4: the reference laser head of laser vibration measurer and scanning laser head are positioned over correct position respectively, ensures reference laser head and scans the laser beam of laser head perpendicular to testing sheet member;
Step 5: arrange test parameter, drives vibrator, opens laser vibration measurer, carries out testing and preserving test data;
Step 6: carry out data analysis to data measured, obtains the frequency response function of sheet member and the relevant vibration shape.
This method of testing for automotive sheet part can be the thin-slab constructions such as door skin, side wall outer panel of automobile body, body front panel and car door ceiling, also can be applicable to the mould measurement of engine, transmission shaft, tire etc.
Present invention employs laser vibration measurer, it is a kind of Non-contact modal test instrument, when application laser vibration measurer carries out mould measurement, without the need to setting up tested object model, does not use conventional vibration sensor.For sheet member such as door skins, application vibration measurement with laser can avoid structural nonlinear and additional mass on the impact of measuring accuracy, saves the test duration simultaneously.While guarantee measuring accuracy, improve testing efficiency.Based on this method of testing, for door skin, door skin local deformation comparatively large regions accurately can be identified, for this region, choose reinforced rubber sheet or self-adhering-type damp film is pasted, suppress its local vibration, reduce door skin vibration acoustic radiation and promote opening/closing door of vehicle sound quality.
Accompanying drawing explanation
Fig. 1 is that car door hangs schematic diagram;
Fig. 2 is the point of excitation position view of this method;
Fig. 3 is the response point schematic diagram of this method when testing for door skin;
Fig. 4 is the frequency sound test schematic diagram of this method when testing for door skin;
Fig. 5 is the door skin reinforced rubber sheet or self-adhering-type damp film layout schematic diagram determined after the test of this employing this method;
In figure: 1, wire rope; 2, suspension bracket (hollow cylinder steel pipe); 3, rubber rope; 4, door skin; 5, best impacting point; 6, door skin measuring point; 7, frequency response function; 8, reinforced rubber sheet or self-adhering-type damp film.
Embodiment
Below for door skin, the invention will be further described by reference to the accompanying drawings.
Step 1: suspension bracket 2 is hung in driving by wire rope 1.Simulation " freely-freely " boundary condition, by door skin 4(not containing vehicle door interior trim part, glass-frame riser, glass, rearview mirror etc.) hang on suspension bracket 2 with soft rubber rope 3, the tie point of suspention door skin should be selected to be on door sash, car door is made to be in horizontal free state, see Fig. 1.
Step 2: select several impacting point to carry out trial test, repeatedly debug, select to encourage the point of car door frequency response function as the best impacting point (i.e. Optimum Excitation position) of preliminary election, the usual local stiffness in this position is higher.When selecting car door to be in horizontal free state in this example, door skin lower end is as the best impacting point of preliminary election.In order to ensure that exciting force can be input to door skin continuously, tappet is selected to be connected with door skin by vibrator, (during application vibrator test structure mode, exciting force is mainly delivered in structure by tappet) and tappet one end be connected with vibrator bolt, the other end is connected with force snesor bolt, the force snesor best impacting point position of the preliminary election of the lower end being pasted onto door skin.
Step 3: by computer, multi-channel vibration noise test macro, power amplifier and and vibrator associated cable connect.The best impacting point of preliminary election is verified, choosing white noise is input signal, regulating power amplifier controls vibrator, if from the point of the best impacting point farthest of preliminary election, test sheet member can feel that test sheet member is in vibration, illustrate that exciting force has the mode of enough energy excitation test sheet member, then this point is best impacting point 5, if can not, then return step 2 and reselect.
Concrete judgment mode: choosing white noise is input signal.Open power amplifier, the voltage of regulating power amplifier and current amplification factor knob, until car door just can feel vibration, namely, car door can feel that car door is in vibration on the point of the best impacting point farthest of preliminary election, select point of excitation now as correct best impacting point 5, see Fig. 2.
Step 4: laser vibration measurer reference laser head and scanning laser head are supported with tripod respectively, is positioned over distance car door 3m position.Adjustment laser vibration measurer reference laser head, makes laser beam vertically point to door skin, ensures stronger reference signal.Adjustment laser vibration measurer scanning laser head, makes reflection lasering beam on door skin all to be received by scanning laser head.
Step 5: arranging sample frequency bandwidth is 0-400Hz, and frequency resolution is 0.5Hz, drives vibrator, opens laser vibration measurer testing software, carries out testing and preserving test data.Door skin measuring point 6 is for applying laser vibration measurer testing software after door skin surface to be measured frame selects an enclosed region, the measuring point result directly divided.Usually, measuring point is uniformly distributed.As paid close attention to a certain test zone, can apply laser vibration measurer testing software increases measuring point for this test zone, and during test, all measuring points carry out test scan one by one, see Fig. 3.
Frame selects measuring point to be similar to the foundation of finite element grid, and the size of grid division determines the density of measuring point.As rearview mirror installation site and door handle installation site, we can pass through grid storage, do not arrange measuring point herein, namely reduce measuring point.
Step 6: check data measured rear (as overload or test failure when some measuring point is tested, cause frequency response function error comparatively large, cause vibration shape misjudgment) without exception.Data analysis is carried out to test data, obtains the frequency response function 7 of door skin, by modal idenlification, obtain the Mode Shape of test carriage external door panel, participate in Fig. 4.
Step 7: by recognition of vibration, determines that door skin is out of shape comparatively large regions, and adhering reinforcing rubber sheets or self-adhering-type damping glue 8 suppress door skin local vibration, thus reaches the object reducing door skin vibration radiation sound and optimize car door sound quality, see Fig. 5.
Claims (2)
1. local mode's method of testing of automotive sheet part, described method of testing uses white noise signal as driving source, and concrete steps are as follows:
Step 1: simulation " freely-freely " boundary condition, horizontally suspends on suspension bracket by test sheet member rubber rope;
Step 2: select several impacting point to carry out trial test, repeatedly debug, select can the point of exciting test sheet member frequency response function as the best impacting point of preliminary election, the usual local stiffness in this position is higher;
Step 3: computer, multi-channel vibration noise test macro, power amplifier and vibrator cable are connected, the best impacting point of preliminary election is verified, choosing white noise is input signal, regulating power amplifier controls vibrator, if from the point of the best impacting point farthest of preliminary election, test sheet member can feel that test sheet member is in vibration, illustrate that exciting force has the mode of enough energy excitation test sheet member, then this point is best impacting point, if can not, then return step 2 and reselect;
Step 4: the reference laser head of laser vibration measurer and scanning laser head are positioned over correct position respectively, ensures reference laser head and scans the laser beam of laser head perpendicular to testing sheet member;
Step 5: arrange test parameter, drives vibrator, opens laser vibration measurer, carries out testing and preserving test data;
Step 6: carry out data analysis to data measured, obtains the frequency response function of sheet member, by modal idenlification, obtains the Mode Shape of test carriage external door panel.
2. local mode's method of testing of automotive sheet part according to claim 1, is characterized in that, described sheet member refers to door skin, side wall outer panel of automobile body, body front panel or vehicle body ceiling.
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| CN104596718A (en) * | 2015-02-28 | 2015-05-06 | 重庆长安汽车股份有限公司 | Demonstration method for acoustic radiation phenomenon of vehicle stamping part |
| CN104776963A (en) * | 2015-04-14 | 2015-07-15 | 北京强度环境研究所 | Acoustic excitation non-contact modal testing system and method |
| CN104913890B (en) * | 2015-06-30 | 2017-07-28 | 重庆长安汽车股份有限公司 | A kind of apparatus for demonstrating and demenstration method of automotive body structure oscillation phenomenon |
| CN104931218B (en) * | 2015-06-30 | 2018-03-13 | 宁波大学 | A kind of system of the Mode Shape of non-contact measurement flexible structure |
| CN107655697A (en) * | 2016-07-25 | 2018-02-02 | 法乐第(北京)网络科技有限公司 | A kind of method and device for identifying vehicle local mode |
| CN106248332B (en) * | 2016-08-31 | 2019-02-15 | 重庆长安汽车股份有限公司 | Test the test-bed and method of clamped Vibration of Rectangular Plates and acoustic radiation |
| CN106124034B (en) * | 2016-09-07 | 2022-07-08 | 湖南科技大学 | Thin-wall part working mode testing device and method based on machine vision |
| CN111400813B (en) * | 2018-12-30 | 2023-04-07 | 长城汽车股份有限公司 | Method for determining connection point of front end structure of vehicle frame |
| CN111400815B (en) * | 2018-12-30 | 2023-04-07 | 长城汽车股份有限公司 | Method for determining automobile frame connection point formed by staggered cross members, non-load-bearing automobile frame and automobile |
| CN111400814B (en) * | 2018-12-30 | 2023-04-07 | 长城汽车股份有限公司 | Method for determining connection point of frame middle structure |
| CN110108504A (en) * | 2019-05-13 | 2019-08-09 | 桂林电子科技大学 | The non-contact excitation of cargo vehicle body mode and non-cpntact measurement acquisition methods |
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