CN101794340B - Method and device for analyzing Squeak and Rattle noise - Google Patents
Method and device for analyzing Squeak and Rattle noise Download PDFInfo
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Abstract
The invention discloses a method and a device for obtaining Squeak and Rattle noise source, and belongs to the field of automobile noise analysis. The method comprises the following steps that: a body-in-white finite element model and a dashboard assembly finite element model are set up; the unit dynamic excitation force is acted on vehicle body suspension points on the body-in-white finite element model to obtain the acceleration response of installation points on the dashboard assembly finite element model; and the source of the Squeak and Rattle noise on the dashboard assembly finite element model is determined according to the acceleration response of the installation points on the dashboard assembly finite element model. The device comprises a modeling module, an acceleration response obtaining module and a Squeak and Rattle noise source obtaining module. The unit dynamic excitation force is acted on the vehicle body suspension points on the body-in-white finite element model to obtain the acceleration response of the installation points on the dashboard assembly finite element model, and the source of the Squeak and Rattle noise on the dashboard assembly finite element model is determined according to the acceleration response of the installation points on the dashboard assembly finite element model, thereby simplifying the process of obtaining the source of the Squeak and Rattle noise.
Description
Technical field
The present invention relates to the automobile noise analysis field, particularly a kind of method and apparatus that obtains Squeak & Rattle noise source.
Background technology
Squeak & Rattle noise is to describe the click that bump produces between body surface contact slip, fricative squeak or the adjacent zeros parts.Squeak & Rattle noise is an important component part of automobile NVH (Noise-Vibration-Harshness) problem, and Squeak & Rattle noise can influence the evaluation of client to car load NVH performance.Therefore how to analyze the source of the Squeak & Rattle noise of automobile in advance, to reduce Squeak & Rattle noise be the focus of research at present thereby can improve the source of the Squeak & Rattle noise of automobile.
Prior art generally is after the development and Design later stage produces the automobile exemplar, obtains the source of Squeak&Rattle noise through subjective assessment and objective examination.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
The source of Squeak & Rattle noise just can obtain through subjective assessment and objective examination after the development and Design later stage produces the automobile exemplar in the prior art, and the process in source of obtaining Squeak & Rattle noise is loaded down with trivial details time-consuming, and waste material.
Summary of the invention
In order to simplify the process in the source that obtains the Squeak&Rattle noise; Reduce the time of the source needs that obtain Squeak & Rattle noise; The material that avoids waste, the embodiment of the invention provides a kind of method and apparatus of the Squeak of obtaining &Rattle noise source.Said technical scheme is following:
A kind of method of obtaining Squeak & Rattle noise source, wherein, Squeak & Rattle noise is to describe the click that bump produces between body surface contact slip, fricative squeak or the adjacent zeros parts, said method comprises:
Set up body in white finite element model, panel assembly finite element model and bearing circle model, and the annex of panel assembly is simplified to the lumped mass point is attached on the said panel assembly finite element model;
Unit dynamic exciting masterpiece is used for the body mount point on the said body in white finite element model, obtains the acceleration responsive of the mounting points on the annex of acceleration responsive and said panel assembly of acceleration responsive, the tho wheel support mounting points on the said bearing circle model of the mounting points on the said panel assembly finite element model;
Whether the acceleration responsive of judging the mounting points on the said panel assembly finite element model surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the mounting points on the said panel assembly finite element model of preset acceleration responsive threshold value;
And whether the acceleration responsive of judging the tho wheel support mounting points on the said bearing circle model surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the tho wheel support mounting points on the said bearing circle model of preset acceleration responsive threshold value;
And whether the acceleration responsive of judging the mounting points on the annex of said panel assembly surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the mounting points on the annex of the said panel assembly of preset acceleration responsive threshold value.
A kind of device that obtains Squeak & Rattle noise source, wherein, Squeak & Rattle noise is to describe the click that bump produces between body surface contact slip, fricative squeak or the adjacent zeros parts, said device comprises:
Model building module is used to set up body in white finite element model, panel assembly finite element model and bearing circle model, and the annex of panel assembly is simplified to the lumped mass point is attached on the said panel assembly finite element model;
The acceleration responsive acquisition module; Be used for unit dynamic exciting masterpiece is used for the body mount point on the said body in white finite element model, obtain the acceleration responsive of the mounting points on the annex of acceleration responsive and said panel assembly of acceleration responsive, the tho wheel support mounting points on the said bearing circle model of the mounting points on the said panel assembly finite element model;
Squeak & Rattle noise source acquisition module; Be used to judge whether the acceleration responsive of the mounting points on the said panel assembly finite element model surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the mounting points on the said panel assembly finite element model of preset acceleration responsive threshold value; And whether the acceleration responsive of judging the tho wheel support mounting points on the said bearing circle model surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the tho wheel support mounting points on the said bearing circle model of preset acceleration responsive threshold value; And whether the acceleration responsive of judging the mounting points on the annex of said panel assembly surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the mounting points on the annex of the said panel assembly of preset acceleration responsive threshold value.
The beneficial effect of the technical scheme that the embodiment of the invention provides is:
In the Automobile Design exploitation in earlier stage; Through unit dynamic exciting masterpiece being used for the body mount point on the body in white finite element model; Obtain and, confirm the source of Squeak & Rattle noise on the panel assembly finite element model, simplified the process in the source that obtains Squeak& Rattle noise according to the acceleration responsive of the mounting points on the panel assembly finite element model; Reduce the time of the source needs that obtain Squeak & Rattle noise, avoided waste material.
Description of drawings
Fig. 1 is the method flow diagram of a kind of Squeak of obtaining & Rattle noise source of providing of the embodiment of the invention 1;
Fig. 2 is the method flow diagram of a kind of Squeak of obtaining & Rattle noise source of providing of the embodiment of the invention 2;
Fig. 3 is a kind of input point in the left and right suspension point of the vehicle body unit of being set to dynamic exciting power that the embodiment of the invention 2 provides; Under input point input unit dynamic exciting power, the Z of 4 main mounting points is to the curve map of acceleration responsive in the IP assembly finite element model;
Fig. 4 is the apparatus structure synoptic diagram of a kind of Squeak of obtaining & Rattle noise source of providing of the embodiment of the invention 3.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Embodiment 1
Referring to Fig. 1, the embodiment of the invention provides a kind of method of the Squeak of obtaining & Rattle noise source, comprising:
101: set up body in white finite element model and panel assembly finite element model.
102: unit dynamic exciting masterpiece is used for the body mount point on the body in white finite element model, obtains the acceleration responsive of the mounting points on the panel assembly finite element model.
103:, confirm the source of Squeak & Rattle noise on the panel assembly finite element model according to the acceleration responsive of the mounting points on the panel assembly finite element model.
Further, when setting up body in white finite element model and panel assembly finite element model, also comprise: set up the bearing circle model;
Correspondingly, during the acceleration responsive of the mounting points on obtaining the panel assembly finite element model, also comprise: the acceleration responsive that obtains the tho wheel support mounting points on the bearing circle model;
Correspondingly; Acceleration responsive according to the mounting points on the panel assembly finite element model; Confirm the source of Squeak & Rattle noise on the panel assembly finite element model; Also comprise:, confirm the source of Squeak & Rattle noise on the bearing circle model according to the acceleration responsive of the tho wheel support mounting points on the bearing circle model.
Further, when setting up body in white finite element model and panel assembly finite element model, also comprise: the annex of panel assembly is simplified to the lumped mass point is attached on the panel assembly finite element model.
The described method of obtaining Squeak & Rattle noise source of the embodiment of the invention; In the Automobile Design exploitation in earlier stage; Through unit dynamic exciting masterpiece being used for the body mount point on the body in white finite element model; Obtain and, confirm the source of Squeak & Rattle noise on the panel assembly finite element model, simplified the process in the source that obtains Squeak & Rattle noise according to the acceleration responsive of the mounting points on the panel assembly finite element model; Reduce the time of the source needs that obtain Squeak & Rattle noise, avoided waste material.
Embodiment 2
The embodiment of the invention is found through a large amount of test results; The Squeak & Rattle noise that automobile produces is mainly relevant with the vibration acceleration of the mounting points on IP (Instrument Panel, the panel assembly) assembly, under certain range of excitation; If the mounting points on the IP assembly has very high vibration acceleration; Then this mounting points just is easy to become loosening after after a while, thereby produces Squeak Rattle noise, and a kind of method of the Squeak of obtaining Rattle noise source is provided according to the above-mentioned principle embodiment of the invention; Referring to Fig. 2, this method comprises:
201: set up body in white finite element model, IP assembly finite element model and bearing circle model.
Wherein, IP assembly finite element model is mainly the skeleton pattern of instrument panel.And need to prove that for more comprehensive, the embodiment of the invention has also been set up the bearing circle model when setting up body in white finite element model, IP assembly finite element model.And, can also some annexes (as: CD/DVD, radio, copilot air bag, display screen etc.) of IP assembly be simplified to the lumped mass point and be attached on the IP assembly finite element model in order to improve the precision of analyzing Squeak & Rattle noise.Can be according to the practical application situation, whether selection is set up the bearing circle model and whether some annexes of IP assembly is simplified to the lumped mass point and be attached on the IP assembly finite element model flexibly, this is not done concrete qualification.
202: the input point of vehicle body left side suspension point and the right suspension point of the vehicle body unit of being set to dynamic exciting power, to input point input unit dynamic exciting power.
The input point of the left and right suspension point of the embodiment of the invention vehicle body unit of being set to dynamic exciting power; The also input point of the vehicle body left side suspension point unit of being set to dynamic exciting power only in the practical application; Or the input point of the right suspension point of the vehicle body unit of being set to dynamic exciting power only; Maybe can other the input point of the combination unit of being set to dynamic exciting power of any body mount point or various body mount points; This is not done concrete qualification, can be provided with flexibly according to the practical application situation.
Need to prove; Test result according to a large amount of shows; In the time of in the 0-50Hz scope; The relation of the Squeak & Rattle noise that the acceleration magnitude of the mounting points on the IP assembly and IP assembly produce is bigger, and 0-50Hz has covered the frequency range of the Squeak & Rattle noise of IP assembly generation basically.Therefore, the embodiment of the invention is in the 0-50HZ scope, to input point input unit dynamic exciting power.But not as limit, also can be chosen in wideer frequency ranges such as 0-60HZ, 0-100HZ in the practical application, this not done concrete qualification.
203: mounting points on the IP assembly finite element model and the tho wheel support mounting points on the bearing circle model are set to response point, export the acceleration responsive of each response point.
Each response point all can have the acceleration responsive of three directions (directions X, Y direction and Z direction) under a unit dynamic exciting power.Need to prove; In order to simplify the process of analyzing Squeak & Rattle noise; Main mounting points on also can IP assembly finite element model and the main tho wheel support mounting points on the bearing circle model are set to response point, and need each mounting points on the IP assembly finite element model and each the tho wheel support mounting points on the bearing circle model all be set to response point.And; If when setting up model, some annexes of IP assembly being simplified to the lumped mass point in the step 201 is attached on the IP assembly finite element model; When then carrying out this step; Also the mounting points on the annex of IP assembly is set to response point simultaneously, and correspondingly also can to select be that main mounting points on the annex of IP assembly is set to response point.
204:, confirm the source of the Squeak & Rattle noise on IP assembly finite element model and the bearing circle model according to the acceleration responsive of each response point on IP assembly finite element model and the bearing circle model.
Particularly; Whether the acceleration responsive of judging each response point on IP assembly finite element model and the bearing circle model respectively surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above mounting points on the IP assembly finite element model of the response point correspondence of preset acceleration responsive threshold value and acceleration responsive above the tho wheel support mounting points on the bearing circle model of the response point correspondence of preset acceleration responsive threshold value.Wherein, preset acceleration responsive threshold value can be provided with according to the practical application situation.If the acceleration responsive of response point surpasses preset acceleration responsive threshold value; Prove that then the corresponding mounting points of this response point can produce bigger Squeak & Rattle noise; The unreasonable structure of this mounting points is optimized improvement to the structure of this mounting points, reduces the acceleration responsive value; Thereby reduce the Squeak & Rattle noise of automobile, improve car load NVH performance.And, be not limited to confirm the source of Squeak & Rattle noise through the method that the acceleration responsive threshold value is set, can also other any feasible methods be set according to the practical application situation.
Need to prove; Because each response point all can have the acceleration responsive of three directions under a unit dynamic exciting power; Therefore; When whether the acceleration responsive of judging each response point surpasses preset acceleration responsive threshold value; Can be whether the acceleration responsive of only judging some directions of each response point surpasses preset acceleration responsive threshold value, maybe can be whether the acceleration responsive of judging certain two direction of each response point all surpasses the acceleration responsive threshold value of presetting, and maybe can be to judge that whether the acceleration responsive of three directions of each response point is all above the acceleration responsive threshold value of presetting; This is not done concrete qualification, can be provided with flexibly according to the practical application situation.
In addition; Need to prove; If in the step 203 also simultaneously the mounting points on the annex of IP assembly be set to response point; When then carrying out this step, also want the acceleration responsive of while, confirm the source of the Squeak & Rattle noise on the IP assembly finite element model according to each response point on the annex of IP assembly.
Referring to Fig. 3; Be input point in the left and right suspension point of the vehicle body unit of being set to dynamic exciting power; Under input point input unit dynamic exciting power; The Z of 4 main mounting points (being expressed as mounting points A, mounting points B, mounting points C and mounting points D respectively) is to the acceleration responsive curve in the IP assembly finite element model; And establishing the corresponding mounting points of peak value in the acceleration responsive curve (value that value that acceleration is maximum and acceleration are minimum) in the present embodiment is the source of Squeak & Rattle noise, from curve, can find out wherein two mounting points (mounting points A and mounting points B) respectively the accekeration at 22Hz, 24Hz reach peak value, confirm the source that these two mounting points are Squeak & Rattle noise; And can improve the structure of these two mounting points, to reduce Squeak & Rattle noise.
The described method of obtaining Squeak & Rattle noise source of the embodiment of the invention; In the Automobile Design exploitation in earlier stage; Through unit dynamic exciting masterpiece being used for the body mount point on the body in white finite element model; Obtain and, confirm the source of Squeak & Rattle noise on the panel assembly finite element model, simplified the process in the source that obtains Squeak & Rattle noise according to the acceleration responsive of the mounting points on the panel assembly finite element model; Reduce the time of the source needs that obtain Squeak & Rattle noise, avoided waste material.
Embodiment 3
Referring to Fig. 3, the embodiment of the invention provides a kind of device of the Squeak of obtaining & Rattle noise source, and this device comprises:
Model building module 301 is used to set up body in white finite element model and panel assembly finite element model.
Acceleration responsive acquisition module 302; Be used for after model building module 301 is set up body in white finite element model and panel assembly finite element model; Unit dynamic exciting masterpiece is used for the body mount point on the body in white finite element model, obtains the acceleration responsive of the mounting points on the panel assembly finite element model.
Squeak & Rattle noise source acquisition module 303; Be used for after acceleration responsive acquisition module 302 obtains the acceleration responsive of the mounting points on the panel assembly finite element model; According to the acceleration responsive of the mounting points on the panel assembly finite element model, confirm the source of Squeak & Rattle noise on the panel assembly finite element model.
Further, model building module 301 also is used for when setting up body in white finite element model and panel assembly finite element model, setting up the bearing circle model.
Correspondingly, acceleration responsive acquisition module 302 when also being used for the acceleration responsive of the mounting points on obtaining the panel assembly finite element model, obtains the acceleration responsive of the mounting points on the bearing circle model.
Correspondingly; Squeak & Rattle noise source acquisition module 303; Also be used at acceleration responsive according to the mounting points on the panel assembly finite element model; When confirming the source of Squeak &Rattle noise on the panel assembly finite element model,, confirm the source of Squeak & Rattle noise on the bearing circle model according to the acceleration responsive of the tho wheel support mounting points on the bearing circle model.
Further, model building module 301 also is used for when setting up body in white finite element model and panel assembly finite element model, the annex of instrument panel is simplified to the lumped mass point is attached on the panel assembly finite element model.
The described device that obtains the Squeak&Rattle noise source of the embodiment of the invention; In the Automobile Design exploitation in earlier stage; Through unit dynamic exciting masterpiece being used for the body mount point on the body in white finite element model; Obtain and, confirm the source of Squeak & Rattle noise on the panel assembly finite element model, simplified the process in the source that obtains Squeak & Rattle noise according to the acceleration responsive of the mounting points on the panel assembly finite element model; Reduce the time of the source needs that obtain Squeak & Rattle noise, avoided waste material.
All or part of content in the technical scheme that above embodiment provides can realize that through software programming its software program is stored in the storage medium that can read, storage medium for example: the hard disk in the computing machine, CD or floppy disk.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. method of obtaining Squeak Rattle noise source; Wherein, Squeak & Rattle noise is to describe the click that bump produces between body surface contact slip, fricative squeak or the adjacent zeros parts, it is characterized in that said method comprises:
Set up body in white finite element model, panel assembly finite element model and bearing circle model, and the annex of panel assembly is simplified to the lumped mass point is attached on the said panel assembly finite element model;
Unit dynamic exciting masterpiece is used for the body mount point on the said body in white finite element model, obtains the acceleration responsive of the mounting points on the annex of acceleration responsive and said panel assembly of acceleration responsive, the tho wheel support mounting points on the said bearing circle model of the mounting points on the said panel assembly finite element model;
Whether the acceleration responsive of judging the mounting points on the said panel assembly finite element model surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the mounting points on the said panel assembly finite element model of preset acceleration responsive threshold value;
And whether the acceleration responsive of judging the tho wheel support mounting points on the said bearing circle model surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the tho wheel support mounting points on the said bearing circle model of preset acceleration responsive threshold value;
And whether the acceleration responsive of judging the mounting points on the annex of said panel assembly surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the mounting points on the annex of the said panel assembly of preset acceleration responsive threshold value.
2. device that obtains Squeak Rattle noise source; Wherein, Squeak & Rattle noise is to describe the click that bump produces between body surface contact slip, fricative squeak or the adjacent zeros parts, it is characterized in that said device comprises:
Model building module is used to set up body in white finite element model, panel assembly finite element model and bearing circle model, and the annex of panel assembly is simplified to the lumped mass point is attached on the said panel assembly finite element model;
The acceleration responsive acquisition module; Be used for unit dynamic exciting masterpiece is used for the body mount point on the said body in white finite element model, obtain the acceleration responsive of the mounting points on the annex of acceleration responsive and said panel assembly of acceleration responsive, the tho wheel support mounting points on the said bearing circle model of the mounting points on the said panel assembly finite element model;
Squeak & Rattle noise source acquisition module; Be used to judge whether the acceleration responsive of the mounting points on the said panel assembly finite element model surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the mounting points on the said panel assembly finite element model of preset acceleration responsive threshold value; And whether the acceleration responsive of judging the tho wheel support mounting points on the said bearing circle model surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the tho wheel support mounting points on the said bearing circle model of preset acceleration responsive threshold value; And whether the acceleration responsive of judging the mounting points on the annex of said panel assembly surpasses preset acceleration responsive threshold value; If surpass, then acceleration responsive is the source of Squeak & Rattle noise above the mounting points on the annex of the said panel assembly of preset acceleration responsive threshold value.
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| CN107832527B (en) * | 2017-11-09 | 2021-05-18 | 广州汽车集团股份有限公司 | Method and system for establishing equivalent simplified model of vehicle body |
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| CN101367414A (en) * | 2008-05-07 | 2009-02-18 | 奇瑞汽车股份有限公司 | Car body sound vibration roughness NVH design method based on low frequency acoustic sensitiveness inside vehicle |
| CN101661522A (en) * | 2009-09-27 | 2010-03-03 | 吉林大学 | Method for analyzing and predicting noise outside car |
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| CN101367414A (en) * | 2008-05-07 | 2009-02-18 | 奇瑞汽车股份有限公司 | Car body sound vibration roughness NVH design method based on low frequency acoustic sensitiveness inside vehicle |
| CN101661522A (en) * | 2009-09-27 | 2010-03-03 | 吉林大学 | Method for analyzing and predicting noise outside car |
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