CN107688697A - Vehicle pattern vehicle body mode of flexural vibration recognition methods - Google Patents
Vehicle pattern vehicle body mode of flexural vibration recognition methods Download PDFInfo
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- CN107688697A CN107688697A CN201710671884.7A CN201710671884A CN107688697A CN 107688697 A CN107688697 A CN 107688697A CN 201710671884 A CN201710671884 A CN 201710671884A CN 107688697 A CN107688697 A CN 107688697A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
Abstract
The invention discloses vehicle pattern vehicle body mode of flexural vibration recognition methods, it is characterised in that：Comprise the following steps：A., the excitation point of identification vehicle body integrally bending is set, and the excitation point includes the excitation point of body structure and the excitation point of body rear end, and the excitation point of body structure and the excitation point of body rear end are respectively positioned on vehicle body frames center line；The response point of identification vehicle body integrally bending is set, and the response point includes the response point, A posts lower end longeron response point, A posts and the response point of B post intermediate longitudinal girders response point, B posts lower end longeron response point, C posts lower end longeron response point and body rear end of body structure B,；C, the excitation point of the excitation point to body structure and body rear end applies unit excitation load simultaneously, the applied excitation load direction of excitation to body structure is consistent with vehicle frame front end center of gravity Y-direction coordinate, and the applied excitation load direction of the excitation point to body rear end is consistent with vehicle frame rear end center of gravity Y-direction coordinate；Present invention can apply to all kinds of automotive fields.
Description
Technical field
The present invention relates to body of a motor car curved-ray tracing method, more particularly to a kind of vehicle pattern vehicle body mode of flexural vibration identification side
Method.
Background technology
Mode of flexural vibration is an important job defined in NVH performance simulation processes, but due to Service cart body, vehicle
Structure complex also include multiple systems such as interior trim, exterior trim, electrical equipment, chassis, braking, and each system in addition to vehicle body
System interacts, intercoupled, and often encounters difficulties or identify mistake on mode of flexural vibration order is defined,
Body of a motor car mode of flexural vibration is known at present and asks the method for frequency response function to carry out as excitation point using damping gun turret more
Assess, but this method can not give counterevidence, the overall bending situation of vehicle, easily causes error.
Patent of the present invention has carried out detailed reasoning contrast on the basis of multiple vehicle performance developments are combined and has drawn vehicle mould
The modal identification method of formula under body bending.
The content of the invention
The technical problems to be solved by the invention are the hot recycling ammonia battery and preparation method for providing a kind of no film, with solution
Certainly conventional fuel cell PEM cost height, complex structure and other problems.
In order to solve the above-mentioned technical problem, the technical scheme is that, vehicle pattern vehicle body mode of flexural vibration recognition methods,
It is characterized in that：Comprise the following steps：
A., the excitation point of identification vehicle body integrally bending is set, and the excitation point includes the excitation point and body rear end of body structure
Excitation point, the excitation point and the excitation point of body rear end of body structure are respectively positioned on vehicle body frames center line.
The response point of identification vehicle body integrally bending is set, and the response point includes the response point of body structure, A posts lower end is indulged B,
Beam response point, A posts and B post intermediate longitudinal girders response point, B posts lower end longeron response point, C posts lower end longeron response point and body rear end
Response point.
C, the excitation point of the excitation point to body structure and body rear end applies unit excitation load simultaneously, to body structure
The applied excitation load direction of excitation point it is consistent with vehicle frame front end center of gravity Y-direction coordinate, the excitation point to body rear end is applied
The excitation load direction added is consistent with vehicle frame rear end center of gravity Y-direction coordinate.
D, frequency response curve identification is carried out to all response points using frequency response function method of identification.
E, the frequency response curve of all response points is subjected to sum-average arithmetic computing, draws integrally bending frequency curve.
F, a vehicle body bending displacement curve is drawn in body center line position, contrasts vehicle body bending displacement curve and entirety
Corner frequency curve, determine vehicle body integrally bending mode.
According to the preferred scheme of vehicle pattern vehicle body mode of flexural vibration recognition methods of the present invention, the excitation of body structure
Point and the recognition methods of response point are：
A1, in body structure determine four points, this four points be left and right longeron respectively with the 3rd crossbeam of body structure and
The joining of 5th crossbeam；This four joinings are the response point of body structure.
A2, establish RB2 units respectively on this four points that step A1 is determined, form central point, the central point is car
The excitation point of body front end.
According to the preferred scheme of vehicle pattern vehicle body mode of flexural vibration recognition methods of the present invention, the excitation of body rear end
Point and the recognition methods of response point are：
A3, in body rear end determine four points, four points of the body rear end be respectively left and right longeron respectively with after vehicle body
The joining of last root crossbeam and last 4th crossbeam is held, this four joinings are the response point of body rear end.
A4, establish RB2 units respectively on this 4 points that step A3 is determined, form central point, the central point is vehicle body
Encourage point in rear end.
The beneficial effect of vehicle pattern vehicle body mode of flexural vibration recognition methods of the present invention is：The present invention knows according to mode
Other method, can accurately lockout issue modal regions, and mode of flexural vibration can be found out rapidly, exclusive PCR mode, have know
The advantages that other method is simple, recognition accuracy is high, there is very high application value, can be applied to all kinds of automotive fields.
Brief description of the drawings
Fig. 1 is the excitation point schematic diagram of identification vehicle body integrally bending of the present invention.
Fig. 2 is to set vehicle body integrally bending response point schematic diagram.
Embodiment
The present invention is further described specifically with reference to embodiment, but the implementation of the present invention is not limited to this.
Referring to Fig. 1 to Fig. 2, vehicle pattern vehicle body mode of flexural vibration recognition methods, comprise the following steps：
A., the excitation point of identification vehicle body integrally bending is set, after the excitation point includes the excitation point 1 and vehicle body of body structure
The excitation point 2 at end, the excitation point 1 of body structure and the excitation point 2 of body rear end are respectively positioned on vehicle body frames center line.
The response point of identification vehicle body integrally bending is set B, the response point 3a, 3b of the response point including body structure, 3c,
3d and body rear end response point 8a, 8b, 8c, 8d and A post lower end longeron response point 4, A posts and B post intermediate longitudinal girder response points
5th, B posts lower end longeron response point 6 and C posts lower end longeron response point 7；A posts lower end longeron response point 4, A posts and B post intermediate longitudinal girders
Response point 5, B posts lower end longeron response point 6 and C posts lower end longeron response point 7 are located on the same side girder of automobile, i.e., are located at simultaneously
Left longeron a or simultaneously on the right vertical beam b, particular location is selected among A posts lower end, A posts and B posts, B posts lower end and C posts
Lower end.
C, the excitation point 2 of the excitation point 1 to body structure and body rear end applies unit excitation load simultaneously, before vehicle body
The excitation load direction that the excitation point at end is applied is consistent with vehicle frame front end center of gravity Y-direction coordinate, the excitation point institute to body rear end
The excitation load direction of application is consistent with vehicle frame rear end center of gravity Y-direction coordinate.
D, frequency response curve identification is carried out to all response points using frequency response function method of identification, that is, obtains all sound
The frequency response curve that should be put.
E, the frequency response curve of all response points is subjected to sum-average arithmetic computing, draws integrally bending frequency curve.
F, a vehicle body bending displacement curve is drawn in body center line position, contrasts vehicle body bending displacement curve and entirety
Corner frequency curve, determine vehicle body integrally bending mode.
In a particular embodiment, the excitation of body structure is put and the recognition methods of response point is：
A1, in body structure four points are determined, this four points are left and right the 3rd horizontal stroke of longeron a, b and body structure respectively
Beam c and the 5th crossbeam d joining；This four joinings 3a, 3b, 3c, 3d are the response point of body structure.
A2, establish RB2 units respectively on this four points that step A1 is determined, form central point, the central point is car
The excitation point 1 of body front end.
The excitation point of body rear end and the recognition methods of response point are：
A3, in body rear end determine four points, four points of the body rear end be respectively left and right longeron a, b respectively with car
Last root crossbeam e and last 4th crossbeam f joining are held behind, and this four joinings are the response point of body rear end
8a、8b、8c、8d。
A4, establish RB2 units respectively on this 4 points that step A3 is determined, form central point, the central point is vehicle body
Rear end excitation point 8.
Claims (3)
1. vehicle pattern vehicle body mode of flexural vibration recognition methods, it is characterised in that：Comprise the following steps
A., the excitation point of identification vehicle body integrally bending is set, and the excitation point includes the excitation point of body structure and swashing for body rear end
Encourage a little, the excitation point of body structure and the excitation point of body rear end are respectively positioned on vehicle body frames center line；
The response point of identification vehicle body integrally bending is set, and the response point includes the response point of body structure, A posts lower end longeron rings B,
The sound of Ying Dian, A post and B post intermediate longitudinal girders response point, B posts lower end longeron response point, C posts lower end longeron response point and body rear end
Ying Dian；
C, the excitation point of the excitation point to body structure and body rear end applies unit excitation load simultaneously, and body structure is swashed
Encourage that a little applied excitation load direction is consistent with vehicle frame front end center of gravity Y-direction coordinate, what the excitation point to body rear end was applied
Excitation load direction is consistent with vehicle frame rear end center of gravity Y-direction coordinate；
D, frequency response curve identification is carried out to all response points using frequency response function method of identification；
E, the frequency response curve of all response points is subjected to sum-average arithmetic computing, draws integrally bending frequency curve；
F, a vehicle body bending displacement curve is drawn in body center line position, contrasts vehicle body bending displacement curve and integrally bending
Frequency curve, determine vehicle body integrally bending mode.
2. vehicle pattern vehicle body mode of flexural vibration recognition methods according to claim 1, it is characterised in that：Body structure swashs
Encouraging the recognition methods a little with response point is：
A1, in body structure four points are determined, this four points are left and right longeron and the 3rd crossbeam and the 5th of body structure respectively
The joining of root crossbeam；This four joinings are the response point of body structure；
A2, establish RB2 units respectively on this four points that step A1 is determined, form central point, before the central point is vehicle body
The excitation point at end.
3. vehicle pattern vehicle body mode of flexural vibration recognition methods according to claim 1, it is characterised in that：Body rear end swashs
Encouraging the recognition methods a little with response point is：
A3, in body rear end determine four points, four points of the body rear end be respectively left and right longeron respectively with body rear end most
The joining of latter crossbeam and last 4th crossbeam, this four joinings are the response point of body rear end；
A4, establish RB2 units respectively on this 4 points that step A3 is determined, form central point, the central point is body rear end
Excitation point.
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| CN201710671884.7A CN107688697B (en) | 2017-08-08 | 2017-08-08 | Method for recognizing bending mode of vehicle body in whole vehicle mode |
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| CN201710671884.7A CN107688697B (en) | 2017-08-08 | 2017-08-08 | Method for recognizing bending mode of vehicle body in whole vehicle mode |
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| CN107688697B CN107688697B (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111985347A (en) * | 2020-07-28 | 2020-11-24 | 广州汽车集团股份有限公司 | Body-in-white modal identification method and device |
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| US6465110B1 (en) * | 2000-10-10 | 2002-10-15 | Material Sciences Corporation | Metal felt laminate structures |
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| CN111985347A (en) * | 2020-07-28 | 2020-11-24 | 广州汽车集团股份有限公司 | Body-in-white modal identification method and device |
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