CN112182758A - Vehicle body VTF post-processing method - Google Patents

Vehicle body VTF post-processing method Download PDF

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Publication number
CN112182758A
CN112182758A CN202011030944.5A CN202011030944A CN112182758A CN 112182758 A CN112182758 A CN 112182758A CN 202011030944 A CN202011030944 A CN 202011030944A CN 112182758 A CN112182758 A CN 112182758A
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point
excitation
vehicle body
mounting point
preset
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王启睿
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Tibet Ningsuan Technology Group Co ltd
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Dilu Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/15—Vehicle, aircraft or watercraft design
    • 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
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]

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Abstract

The invention discloses a VTF post-processing method for a vehicle body, which comprises the following steps: establishing a Trimmed Body finite element model of the vehicle Body, selecting a plurality of attachment points in each attachment point between a vehicle Body chassis and the vehicle Body as excitation points, applying a preset frequency range and a preset amplitude value of a horizontal load in three preset directions of each excitation point, inputting the established finite element model and related parameters into a Nastran finite element solver, obtaining acceleration response curves generated by the horizontal load applied to each excitation point at each preset response point, comparing the maximum peak value and a preset target value of each acceleration response curve, and optimizing the dynamic stiffness of the corresponding excitation point according to the comparison result; the method provided by the invention is simple and efficient, and is used for carrying out aftertreatment on the VTF of the vehicle body.

Description

Vehicle body VTF post-processing method
Technical Field
The invention relates to the technical field of VTF post-processing, in particular to a vehicle body VTF post-processing method.
Background
The VTF (Vibration Transfer Function) is a ratio of a Vibration acceleration at a response point to an input load at an excitation point when a banner load is applied to the excitation point of a vehicle body, and is also called a Vibration Transfer Function, and is characterized by a scaling effect of a vehicle body structure on input energy transferred to a seat rail and a steering wheel through structural Vibration. The VTF of the vehicle body is an effective method for evaluating the NVH (Noise-Vibration-Harshness) performance of the structure in advance in the development of the whole vehicle, the Vibration characteristics and the problems of weighing of the vehicle body can be known through VTF analysis, and further structural optimization is carried out, so that the vehicle body achieves better NVH characteristics, and therefore VTF analysis of the whole vehicle is very necessary.
In the VTF analysis process of the vehicle body, the VTF post-processing process is very complicated due to numerous excitation points, and a simple and efficient VTF post-processing method is needed, so that the dynamic stiffness of the relevant excitation points of the vehicle body is optimized according to the analysis result.
Disclosure of Invention
The purpose of the invention is as follows: the simple and efficient vehicle body VTF post-processing method is provided.
The technical scheme is as follows: the method provided by the invention comprises the following steps:
step 1, establishing a Trimmed Body finite element model of a vehicle Body;
step 2, selecting N preset attachment points from the attachment points between the vehicle body chassis and the vehicle body as excitation points; respectively applying banner loads with preset frequency ranges and preset amplitudes to the excitation points according to preset three directions;
step 3, analyzing a Trimmed Body finite element model of the vehicle Body by using a Nastran finite element solver according to the excitation points in the step 2 and the preset frequency range and the preset amplitude of the banner loads applied to the excitation points in the preset three directions, and further acquiring 3 multiplied by N multiplied by M acceleration response curves generated by the banner loads applied to the excitation points in all directions at preset M response points;
step 4, aiming at each acceleration response curve S obtained in step 3i,j,k，Si,j,kRepresenting an acceleration response curve generated at a preset response point k by the banner load applied to the ith excitation point in the jth direction; wherein i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to 3, k is more than or equal to 1 and less than or equal to M:
judging an acceleration response curve Si,j,kIf the maximum peak value of the excitation point is larger than the set target value, optimizing the dynamic stiffness of the ith excitation point in the jth direction if the maximum peak value of the excitation point is larger than the set target value.
In a preferred embodiment of the present invention, in step 2, the excitation points include a front excitation point group and a rear excitation point group.
Further, the set of front excitation points includes: the front suspension mounting point of the front suspension left swing arm comprises a front suspension left swing arm mounting point 1, a power assembly left suspension mounting point 2, a front suspension right swing arm mounting point 3, a front suspension right shock absorber mounting point 4, a power assembly right suspension mounting point 5, a front suspension left shock absorber mounting point 6, a front suspension left swing arm rear mounting point 7, a power assembly rear suspension mounting point 8 and a front suspension right swing arm rear mounting point 9.
Further, the rear excitation point group comprises a rear suspension torsion beam left mounting point 10, a rear suspension torsion beam right mounting point 11, a rear suspension left spring support mounting point 12, a rear suspension left shock absorber mounting point 13, a rear suspension right shock absorber mounting point 14 and a rear suspension right spring support mounting point 15.
In step 2, the frequency range of the banner load applied to each excitation point in each direction is 1 to 100Hz, and the amplitude of the banner load applied to each excitation point is 1N.
As a preferable aspect of the present invention, in step 3, the preset response point includes: steering wheel 12 point position 8001, and driver seat outboard track front side point 8002.
Has the advantages that: compared with the prior art, the VTF post-processing method of the vehicle Body provided by the invention has the advantages that the acceleration response curves of each preset response point are obtained by establishing the Trimmed Body finite element model of the vehicle Body and combining the Nastran finite element solver, the maximum peak value of each acceleration response curve is compared with the set target value, and the dynamic stiffness of the excitation point is optimized according to the comparison result; the method is simple and has high efficiency.
Drawings
FIG. 1 is a schematic diagram of the positions of excitation points in a front set of excitation points provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the positions of excitation points in a post-excitation point group provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of the locations of response points provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a simulated cloud computing platform architecture provided in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of one of the corresponding acceleration curves and a preset target acceleration curve according to the embodiment of the present invention;
in the figure: 1. a front mounting point of a front suspension left swing arm; 2. a power assembly left suspension mounting point; 3. a front mounting point of a front suspension right swing arm; 4. a front suspension right damper mounting point; 5. a power assembly right suspension mounting point; 6. a front suspension left shock absorber mounting point; 7. a front suspension left swing arm rear mounting point; 8. a power assembly rear suspension mounting point; 9. a front suspension right swing arm rear mounting point; 10. a left mounting point of the rear suspension torsion beam; 11. a rear suspension torsion beam right mounting point; 12. a rear suspension left spring support mounting point; 13. a rear suspension left shock absorber mounting point; 14. a rear suspension right damper mounting point; 15. a rear suspension right spring support mounting point; 8001. position of steering wheel 12 point direction; 8002. the front side point of the guide rail on the outer side of the driver seat.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, the terms "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and do not require that the present invention must be patterned and operated in a specific orientation, and thus, are not to be construed as limiting the present invention.
The invention provides a VTF (vehicle body VTF) post-processing method, which comprises the following steps:
step 1, establishing a Trimmed Body finite element model of a vehicle Body;
step 2, selecting N preset attachment points from the attachment points between the vehicle body chassis and the vehicle body as excitation points; and respectively applying the banner loads with preset frequency ranges and preset amplitudes to the excitation points according to preset three directions.
Referring to fig. 1 and 2, there are 15 excitation points, including a front excitation point group and a rear excitation point group.
The front excitation point group includes: the front suspension mounting point comprises a front suspension left swing arm front mounting point 1, a front suspension left swing arm rear mounting point 7, a front suspension left shock absorber mounting point 6, a front suspension right shock absorber mounting point 4, a power assembly left suspension mounting point 2, a power assembly right suspension mounting point 5, a power assembly rear suspension mounting point 8, a front suspension right swing arm front mounting point 3 and a front suspension right swing arm rear mounting point 9.
The rear excitation point group comprises a rear suspension torsion beam left mounting point 10, a rear suspension torsion beam right mounting point 11, a rear suspension left spring support mounting point 12, a rear suspension right spring support mounting point 15, a rear suspension left shock absorber mounting point 13 and a rear suspension right shock absorber mounting point 14.
The three preset directions are X-axis, Y-axis and Z-axis directions: the X axis is parallel to the horizontal plane, and the positive direction of the X axis is along the direction from the vehicle body to the tail of the vehicle; the Y axis is vertical to the horizontal plane, and the positive direction of the Y axis is a vertical upward direction; the Z axis is perpendicular to the XY plane formed by the X axis and the Y axis.
The frequency range of the banner load applied in each direction is 1-100 Hz, and the amplitude of the banner load applied to each excitation point is 1N.
And 3, analyzing the Trimmed Body finite element model of the vehicle Body by using a Nastran finite element solver according to the excitation points in the step 2 and the preset frequency range and the preset amplitude of the banner loads applied to the excitation points in the preset three directions, and further acquiring 3 multiplied by N multiplied by M acceleration response curves generated by the banner loads applied to the excitation points in all directions at the preset M response points.
In one embodiment, the number M of response points is 2: referring to fig. 3, the response points include a position 8001 of the steering wheel 12 point direction, and a driver seat outside rail front side point 8002.
When the analysis is performed using the nanostran finite element solver, it is necessary to number the nodes for each response point, for example, the response point on the steering wheel is numbered 8001, and the response point on the seat rail is numbered 8002.
In one embodiment, the pch file output by the Nastran finite element solver and containing the acceleration response curve related data is further processed by using a simulation cloud computing platform. The framework of the simulation cloud computing platform is shown in fig. 4 and comprises a task input module, a master control service module and a plurality of agent service modules. The processing efficiency can be improved by extracting all the corresponding acceleration data of each response point in the file through the simulation cloud computing platform. During the course of treatmentThe task input module inputs the file into the master control service module, the master control service module is used for receiving the file to search resources, schedule and distribute tasks, namely the master control service module dynamically adjusts and distributes the tasks according to the task quantity of each agent service module, and therefore the purposes of improving the resource utilization rate and improving the data processing efficiency are achieved. Step 4, aiming at each acceleration response curve S obtained in step 3i,j,k，Si,j,kRepresenting an acceleration response curve generated at a preset response point k by the banner load applied to the ith excitation point in the jth direction; wherein i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to 3, k is more than or equal to 1 and less than or equal to M:
judging an acceleration response curve Si,j,kIf the maximum peak value of the excitation point is larger than the set target value, optimizing the dynamic stiffness of the ith excitation point in the jth direction if the maximum peak value of the excitation point is larger than the set target value.
For each direction of each excitation point, the response point has its different acceleration response output, and acceleration curves are made for all response points under all different excitations, respectively, so that in the present embodiment, a total of 3 × 15 × 2 acceleration response curves are obtained.
Referring to fig. 5, the obtained 90 acceleration response curves are compared with a preset target acceleration curve, where the target acceleration response curve is a straight line generated according to a preset target value, and when the acceleration response curve S is obtainedi,j,kWhen any peak value in the ith excitation point is higher than the corresponding curve of the target acceleration, the dynamic stiffness of the ith excitation point in the jth direction is optimized.
The VTF post-processing method of the vehicle Body comprises the steps of establishing a Trimmed Body finite element model of the vehicle Body, obtaining acceleration response curves of preset response points by combining a Nastran finite element solver, comparing the maximum peak value of each acceleration response curve with a set target value, and optimizing the dynamic stiffness of an excitation point according to the comparison result; the method is simple and has high efficiency.
The above description is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims (6)

1. A VTF (vehicle body VTF) post-processing method is characterized by comprising the following steps:
step 1, establishing a Trimmed Body finite element model of a vehicle Body;
step 2, selecting N preset attachment points from the attachment points between the vehicle body chassis and the vehicle body as excitation points; respectively applying banner loads with preset frequency ranges and preset amplitudes to the excitation points according to preset three directions;
step 3, analyzing a Trimmed Body finite element model of the vehicle Body by using a Nastran finite element solver according to the excitation points in the step 2 and the preset frequency range and the preset amplitude of the banner loads applied to the excitation points in the preset three directions, and further acquiring 3 multiplied by N multiplied by M acceleration response curves generated by the banner loads applied to the excitation points in all directions at preset M response points;
step 4, aiming at each acceleration response curve S obtained in step 3i,j,k，Si,j,kRepresenting an acceleration response curve generated at a preset response point k by the banner load applied to the ith excitation point in the jth direction; wherein i is more than or equal to 1 and less than or equal to N, j is more than or equal to 1 and less than or equal to 3, k is more than or equal to 1 and less than or equal to M:
judging an acceleration response curve Si,j,kIf the maximum peak value of the excitation point is larger than the set target value, optimizing the dynamic stiffness of the ith excitation point in the jth direction if the maximum peak value of the excitation point is larger than the set target value.
2. The vehicle body VTF aftertreatment method of claim 1, wherein in step 2, the excitation points comprise a front excitation point group and a rear excitation point group.
3. The vehicle body VTF aftertreatment method of claim 2, wherein the set of forward excitation points comprises: the front suspension mounting point of the front suspension left swing arm comprises a front suspension left swing arm mounting point 1, a power assembly left suspension mounting point 2, a front suspension right swing arm mounting point 3, a front suspension right shock absorber mounting point 4, a power assembly right suspension mounting point 5, a front suspension left shock absorber mounting point 6, a front suspension left swing arm rear mounting point 7, a power assembly rear suspension mounting point 8 and a front suspension right swing arm rear mounting point 9.
4. The vehicle body VTF aftertreatment method of claim 2, wherein the set of rear excitation points comprises a rear suspension torsion beam left mounting point 10, a rear suspension torsion beam right mounting point 11, a rear suspension left spring mount mounting point 12, a rear suspension left shock absorber mounting point 13, a rear suspension right shock absorber mounting point 14, a rear suspension right spring mount mounting point 15.
5. The VTF after-treatment method for vehicle bodies according to claim 1, characterized in that in step 2, the frequency range of the banner load applied to each excitation point in each direction is 1 to 100Hz, and the magnitude of the banner load applied to each excitation point is 1N.
6. The VTF after-treatment method for vehicle bodies according to claim 1, characterized in that in step 3, said preset response points comprise: steering wheel 12 point position 8001, and driver seat outboard track front side point 8002.
CN202011030944.5A 2020-09-27 2020-09-27 Vehicle body VTF post-processing method Withdrawn CN112182758A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112861261A (en) * 2021-01-29 2021-05-28 西藏宁算科技集团有限公司 Vehicle body attachment point dynamic stiffness post-processing method and device and electronic equipment

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CN106845015A (en) * 2017-02-24 2017-06-13 江铃汽车股份有限公司 A kind of Vehicle Interior Noise computational methods
CN106996875A (en) * 2017-06-02 2017-08-01 广西科技大学 A kind of vehicle cab transmission function acquisition methods

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN106845015A (en) * 2017-02-24 2017-06-13 江铃汽车股份有限公司 A kind of Vehicle Interior Noise computational methods
CN106996875A (en) * 2017-06-02 2017-08-01 广西科技大学 A kind of vehicle cab transmission function acquisition methods

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彭波: "某商用车驾驶员座椅的动态舒适性分析及优化", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, no. 01, pages 035 - 555 *

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Address after: 11 / F, Liuwu building, Liuwu New District, Lhasa City, Tibet Autonomous Region, 850000

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Address before: Building C4, No.55 Liyuan South Road, moling street, Jiangning District, Nanjing City, Jiangsu Province

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Application publication date: 20210105