CN106256670A - A kind of optimization method of fascia board girder - Google Patents
A kind of optimization method of fascia board girder Download PDFInfo
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- CN106256670A CN106256670A CN201510332482.5A CN201510332482A CN106256670A CN 106256670 A CN106256670 A CN 106256670A CN 201510332482 A CN201510332482 A CN 201510332482A CN 106256670 A CN106256670 A CN 106256670A
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Abstract
A kind of optimization method of fascia board girder, problem to be solved is in exploitation new dashboard cross member design, can development cost, Physical Experiment relatively costly.How long development time causes human cost to increase；The technical scheme is that Quantitative design mode reduces design error, optimized Structure Design.It is an advantage of the invention that and be able to ensure that on the basis of there is high natural frequency, high structural strength, alleviate the weight of product structure as much as possible, reduce production cost, it is achieved functional design.
Description
Technical field
The invention belongs to fascia board girder design field, the optimization method of a kind of fascia board girder.
Background technology
Dashboard module is the important component part of automobile, and dashboard cross member, again as the important component part of dashboard module, is the basis of the overlap joints such as instrument board, air-conditioning, air bag.Decide the direction of instrument board engineering design；Dashboard cross member and vehicle body connection status, affect vehicle driving condition；With fixing of steering column, affect the safety of Automobile operation.
At present, there is steering wheel Idling wobble the project development stage, turn to the medium problem of stress collection in a lot of main engine plants, is to cause owing to dashboard cross member design is unreasonable through analyzing.Due to the importance of dashboard cross member, a lot of main engine plants dare not brand-new design, simply indiscriminately imitate competing product car or the amendment of little scope.Causing in this product piece, domestic independent brand technological accumulation lags behind foreign capitals brand.The idling frequency 25Hz-28HZ of the electromotor of automobile under normal circumstances, steering wheel is more than 50HZ with the first natural frequency of steering column, is checked by a large amount of engineering practices, first natural frequency 33-35HZ of instrument board.The first natural frequency of dashboard cross member to be avoided resonating with electromotor, and after instrument board and its associate member snap on dashboard cross member, the first natural frequency of dashboard cross member about declines 5%.Dashboard cross member design takes into full account intensity, rigidity, mode.
Summary of the invention
It is an object of the invention to provide the optimization method of a kind of fascia board girder.
The object of the present invention is achieved like this, and it includes: selects material, determines each several part mounting structure of dashboard cross member, uses software to be analyzed the integral rigidity of dashboard cross member, and its feature comprises the following steps:
1) the selected main material of crossbeam；
2) main mounting bracket is determined；
3) integral rigidity of dashboard cross member is adjusted；
4) crossbeam fundamental frequency is improved；
5) utilizing ABAQUS, NASTRAN instrument to be analyzed: by dashboard cross member flexible suspension, using vibrator as driving source, choose 30 points and carry out pick-up on dashboard cross member, measurement direction is perpendicular to car door each measuring point normal direction；
6) stress and strain model is carried out: by basic data crossbeam Car body model under constraints, it is carried out grid division；
7) in the stage of stress and strain model, pre-processing software is utilized to be processed by plaid matching: emphasis divides at solder joint, each sub-stent junction, each fillet, the junction of reinforcement, amendment deformity grid leak；Grid is processed the most reasonable；
8) for the solder joint on support, the modeling utilizing the poster processing soft to carry out solder joint sets with dissecting, and adjusts the change of constraint, the change of vehicle body degree of freedom and temperature field thereof during setting；During invention, crossbeam is connected with the constraint of middle channel bracket；
9) thin-walled workpiece basic resonant frequency f is utilizednPlace has spectrum density Gn(fn) uniform pressure field represent dashboard cross member idling excitation.The mean square response of displacement and the mean square response of stress represent with following formula respectively:
In formula: y0Uniformly distributed load P0The Static Correction produced；
σ0Static stress；
ξ damping ratios；
Pressure statistical property represents by their cross-spectral density, and in the case of the coupling terms ignored between each mode, the spectrum density of displacement is expressed as:
In formula: φrR rank resonance mode；
MrR rank modal mass；
ξrR rank damping ratios；
Assume that every first-order modal is all slight damping and is separate in frequency, utilize result integration in all modality range of formula (1) that equal azimuthal displacement amount must be arrived, thus obtain the sum of every first-order modal response:
During using modal analysis method to be designed, it is necessary to assume that the boundary condition of thin-wall construction, provide assumed condition and propose the step consistent with program: estimation thin-wall construction and natural frequency fn；Spectrum density G of vibration noise at estimation natural frequencyn(fn)；Assume damping ratio ξ at natural frequency；Calculate static stress σn；Estimation RMS stress；The estimation out-of-service time；
The impact on frequency of rigidity and quality is obtained: the former and mode are directly proportional, and the latter and mode are inversely proportional to by theory analysis；Owing to the change of vehicle body beam structure directly affects the vibration characteristics of these parts, the evaluation index using the vibration characteristics structural sensitivity factor of crossbeam to improve as structure optimization, find the main structural reason affecting crossbeam vibration characteristics on this basis；
10) by introducing the concept of sensitivity, can truly reflect the effectiveness of structure design alteration, specify structural design optimization direction；
11) on crossbeam, the optimization order of each support is: support, auxiliary fasia console electric support, air bag support, glove box support, wire harness bracket on the right side of steering column support, body support, middle passage left socle, middle passage.
Described main material is the main material of SPCC.
Described main mounting bracket is by support, auxiliary fasia console electric support, air bag support, glove box support, wire harness bracket on the right side of steering column support, body support, middle passage left socle, middle passage by dashboard cross member structure.
The vibration characteristics structural sensitivity factor of described crossbeam is crossbeam frequency and the relation function of structure change；Sensitivity factor computing formula: δ=(B-A)/B × 100% (5)
A: architecture basics frequency；B: the frequency after change in design.
The invention have the advantage that and guarantee on the basis of there is high natural frequency, high structural strength, alleviate the weight of product structure as much as possible, reduce production cost, it is achieved functional design.
By example, the present invention will be described in further detail below, but the following example example therein that is only the present invention, not representing the right protection scope that the present invention is limited, the scope of the present invention is as the criterion with claims.
Detailed description of the invention
Example 1
The optimization step of fascia board girder:
1) the selected main material of crossbeam；
2) main mounting bracket is determined；
3) integral rigidity of dashboard cross member is adjusted；
4) crossbeam fundamental frequency is improved；
5) utilizing ABAQUS, NASTRAN instrument to be analyzed: by dashboard cross member flexible suspension, using vibrator as driving source, choose 30 points and carry out pick-up on dashboard cross member, measurement direction is perpendicular to car door each measuring point normal direction；
6) stress and strain model is carried out: by basic data crossbeam Car body model under constraints, it is carried out grid division；
7) in the stage of stress and strain model, pre-processing software is utilized to be processed by plaid matching: emphasis divides at solder joint, each sub-stent junction, each fillet, the junction of reinforcement, amendment deformity grid leak；Grid is processed the most reasonable；
8) for the solder joint on support, the modeling utilizing the poster processing soft to carry out solder joint sets with dissecting, and adjusts the change of constraint, the change of vehicle body degree of freedom and temperature field thereof during setting；During invention, crossbeam is connected with the constraint of middle channel bracket；
9) thin-walled workpiece basic resonant frequency f is utilizednPlace has spectrum density Gn(fn) uniform pressure field represent dashboard cross member idling excitation.The mean square response of displacement and the mean square response of stress represent with following formula respectively:
In formula: y0Uniformly distributed load P0The Static Correction produced；
σ0Static stress；
ξ damping ratios；
Pressure statistical property represents by their cross-spectral density, and in the case of the coupling terms ignored between each mode, the spectrum density of displacement is expressed as:
In formula: φrR rank resonance mode；
MrR rank modal mass；
ξrR rank damping ratios；
Assume that every first-order modal is all slight damping and is separate in frequency, utilize result integration in all modality range of formula (1) that equal azimuthal displacement amount must be arrived, thus obtain the sum of every first-order modal response:
During using modal analysis method to be designed, it is necessary to assume that the boundary condition of thin-wall construction, provide assumed condition and propose the step consistent with program: estimation thin-wall construction and natural frequency fn；Spectrum density G of vibration noise at estimation natural frequencyn(fn)；Assume damping ratio ξ at natural frequency；Calculate static stress σn；Estimation RMS stress；The estimation out-of-service time；
The impact on frequency of rigidity and quality is obtained: the former and mode are directly proportional, and the latter and mode are inversely proportional to by theory analysis；Owing to the change of vehicle body beam structure directly affects the vibration characteristics of these parts, the evaluation index using the vibration characteristics structural sensitivity factor of crossbeam to improve as structure optimization, find the main structural reason affecting crossbeam vibration characteristics on this basis；
A) by introducing the concept of sensitivity, can truly reflect the effectiveness of structure design alteration, specify structural design optimization direction；
11) on crossbeam, the optimization order of each support is: support, auxiliary fasia console electric support, air bag support, glove box support, wire harness bracket on the right side of steering column support, body support, middle passage left socle, middle passage.
Described main material is the main material of SPCC.
Described main mounting bracket is by support, auxiliary fasia console electric support, air bag support, glove box support, wire harness bracket on the right side of steering column support, body support, middle passage left socle, middle passage by dashboard cross member structure.
The vibration characteristics structural sensitivity factor of described crossbeam is crossbeam frequency and the relation function of structure change；Sensitivity factor computing formula: δ=(B-A)/B × 100% (5)
A: architecture basics frequency；B: the frequency after change in design.
Sensitivity technique comparison table is as follows:
By the contrast in upper table, the structural modification of 7.8.9 item significantly improves the sensitivity of crossbeam, is the key factor of crossbeam.
Claims (4)
1. an optimization method for fascia board girder, it includes: select material, determines each several part mounting structure of dashboard cross member, uses software to be analyzed the integral rigidity of dashboard cross member, and its feature comprises the following steps:
The selected main material of crossbeam；
Determine main mounting bracket；
Adjust the integral rigidity of dashboard cross member；
Improve crossbeam fundamental frequency；
Utilizing ABAQUS, NASTRAN instrument to be analyzed: by dashboard cross member flexible suspension, using vibrator as driving source, choose 30 points and carry out pick-up on dashboard cross member, measurement direction is perpendicular to car door each measuring point normal direction；
Carry out stress and strain model: by basic data crossbeam Car body model under constraints, it is carried out grid division；
In the stage of stress and strain model, pre-processing software is utilized to be processed by plaid matching: emphasis divides at solder joint, each sub-stent junction, each fillet, the junction of reinforcement, amendment deformity grid leak；Grid is processed the most reasonable；
For the solder joint on support, the modeling utilizing the poster processing soft to carry out solder joint sets with dissecting, and adjusts the change of constraint, the change of vehicle body degree of freedom and temperature field thereof during setting；During invention, crossbeam is connected with the constraint of middle channel bracket；
9) thin-walled workpiece basic resonant frequency f is utilizednPlace has spectrum density Gn(fn) uniform pressure field represent dashboard cross member idling excitation；
The mean square response of displacement and the mean square response of stress represent with following formula respectively:
In formula: y0Uniformly distributed load P0The Static Correction produced；
σ0Static stress；
ξ damping ratios；
Pressure statistical property represents by their cross-spectral density, and in the case of the coupling terms ignored between each mode, the spectrum density of displacement is expressed as:
In formula: φrR rank resonance mode；
MrR rank modal mass；
ξrR rank damping ratios；
Assume that every first-order modal is all slight damping and is separate in frequency, utilize result integration in all modality range of formula (1) that equal azimuthal displacement amount must be arrived, thus obtain the sum of every first-order modal response:
During using modal analysis method to be designed, it is necessary to assume that the boundary condition of thin-wall construction, provide assumed condition and propose the step consistent with program: estimation thin-wall construction and natural frequency fn；Spectrum density G of vibration noise at estimation natural frequencyn(fn)；Assume damping ratio ξ at natural frequency；Calculate static stress σn；Estimation RMS stress；The estimation out-of-service time；
The impact on frequency of rigidity and quality is obtained: the former and mode are directly proportional, and the latter and mode are inversely proportional to by theory analysis；Owing to the change of vehicle body beam structure directly affects the vibration characteristics of these parts, the evaluation index using the vibration characteristics structural sensitivity factor of crossbeam to improve as structure optimization, find the main structural reason affecting crossbeam vibration characteristics on this basis；
By introducing the concept of sensitivity, can truly reflect the effectiveness of structure design alteration, specify structural design optimization direction；
11) on crossbeam, the optimization order of each support is: support, auxiliary fasia console electric support, air bag support, glove box support, wire harness bracket on the right side of steering column support, body support, middle passage left socle, middle passage.
The optimization method of a kind of fascia board girder, is characterized in that: described main material is the main material of SPCC.
The optimization method of a kind of fascia board girder, is characterized in that: described main mounting bracket is by support, auxiliary fasia console electric support, air bag support, glove box support, wire harness bracket on the right side of steering column support, body support, middle passage left socle, middle passage by dashboard cross member structure.
The optimization method of a kind of fascia board girder, is characterized in that: the vibration characteristics structural sensitivity factor of described crossbeam is crossbeam frequency and the relation function of structure change；Sensitivity factor calculates
Formula: δ=(B-A)/B × 100% (5)
A: architecture basics frequency；B: the frequency after change in design.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541549A (en) * | 2016-10-14 | 2017-03-29 | 苏州恒源盛模塑有限公司 | A kind of preparation technology of plastics crossbeam tubing string |
| CN108287951A (en) * | 2018-01-03 | 2018-07-17 | 北京汽车股份有限公司 | Eliminate vehicle steering wheel Idling wobble method and device |
| CN111222263A (en) * | 2019-10-31 | 2020-06-02 | 长春英利汽车工业股份有限公司 | Finite element simulation method for instrument board beam vibration test |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541549A (en) * | 2016-10-14 | 2017-03-29 | 苏州恒源盛模塑有限公司 | A kind of preparation technology of plastics crossbeam tubing string |
| CN106541549B (en) * | 2016-10-14 | 2018-08-21 | 苏州恒源盛模塑有限公司 | A kind of preparation process of plastics crossbeam tubing string |
| CN108287951A (en) * | 2018-01-03 | 2018-07-17 | 北京汽车股份有限公司 | Eliminate vehicle steering wheel Idling wobble method and device |
| CN108287951B (en) * | 2018-01-03 | 2021-12-24 | 北京汽车股份有限公司 | Method and device for eliminating idle speed jitter of automobile steering wheel |
| CN111222263A (en) * | 2019-10-31 | 2020-06-02 | 长春英利汽车工业股份有限公司 | Finite element simulation method for instrument board beam vibration test |
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