Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Vehicle body top cover NVH performance optimization method

An optimization method, the technology of the top cover, applied in the direction of design optimization/simulation, instrumentation, computer material science, etc., can solve problems such as noise

Pending Publication Date: 2022-07-22
CHONGQING COLLEGE OF ELECTRONICS ENG
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide a method for optimizing the NVH performance of the vehicle body roof to solve the problem of noise generated in the car at a specific frequency. The specific methods include:

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Vehicle body top cover NVH performance optimization method
  • Vehicle body top cover NVH performance optimization method
  • Vehicle body top cover NVH performance optimization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] like image 3 The shown body roof 1, under the modal frequency of 44 Hz, has an obvious area of ​​strain energy mainly concentrated in the middle and rear regions of the body roof 1. The modal strain energy is mainly concentrated on the rear stiffener. At this time, it is difficult to design an accurate damping material layout on the top cover according to the modal strain energy of the stiffener. Therefore, it is necessary to use the dynamic theory of stiffeners to "transfer" the strain energy of the stiffeners to the roof 1 of the vehicle body to complete the design optimization of the damping material.

[0037] The specific design optimization steps are basically as follows figure 1 The process involved is completed, which specifically includes step 1 S1: in the Hyperworks software, establish a body sound and vibration coupling model; numerically simulate the vehicle to be designed through the software, so that the simulated body in the software matches the actual ...

Embodiment 2

[0057] This embodiment is mainly aimed at figure 2 and Figure 4 The damping material 5 designed for the body top cover 1 is designed according to the steps and calculation methods in Embodiment 1, and the parameters involved in the body top cover 1 are input into the Altair Hyperworks software. generate as image 3 The area of ​​strain energy concentration shown.

[0058] The parameters of the body roof 1 in this embodiment are: the thickness of the body roof 1 is 0.8 mm; the cross section of the main reinforcing rib 2 is 107.21 square millimeters; The cross section of the auxiliary reinforcing rib 4 on one side is 67.41 square millimeters.

[0059] The cross-sectional area A of the main stiffener 2 x 107.21mm 2 ;k x is the shear correction factor, which is 5 / 6; I y is the inertia moment of the stiffener on the y-axis, specifically 2.85e4mm 4 ;J x is the torsional constant, specifically 35.74.

[0060] The cross section of the auxiliary reinforcing rib 3 on the sid...

Embodiment 3

[0070] like Figure 5 The noise decibel diagram of the test at the modal frequency shown, the noise measurement point of the rear seat in the car is in the low frequency band of 40-55Hz. From the test results, it can be seen that the peak value of the noise in the car is attenuated by more than 10dB(A). It is shown that the method can effectively improve the interior noise performance.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to a body top cover NVH (Noise Vibration and Harshness) performance optimization method in the field of vehicle intelligent manufacturing, which comprises the following steps of: firstly, establishing a vehicle body sound-vibration coupling model in Hyperworks software; according to a vehicle body sound vibration coupling model, calculating an in-vehicle back row noise sound pressure level spectrum; a noise peak value behind the interior of the vehicle; strain energy of the vehicle body roof; converting the vehicle body top cover and the reinforcing rib structure into a stiffened plate mechanical model; carrying out a strain energy calculation method on the new model to obtain strain energy distribution of the vehicle body top cover; a plurality of damping material covering areas are formed through segmentation of the stamping protruding ribs and the reinforcing ribs; establishing a middle damping material model by software; performing damping material area matching on the damping material coverage area; and finally, the noise performance in the vehicle is verified, the noise peak value of the 40-50 Hz frequency band corresponding to the concerned modal strain energy of the vehicle body roof is reduced by 10 dB, and the vehicle body roof structure obtained through the method can effectively eliminate the noise of the rear row.

Description

technical field [0001] The invention belongs to the vehicle intelligent manufacturing technology, and specifically relates to a method for optimizing the NVH performance of a vehicle roof. Background technique [0002] NVH is the English abbreviation of Noise, Vibration and Harshness. This is a comprehensive issue to measure the quality of automobile manufacturing, and it gives the most direct and superficial feeling to automobile users. The NVH problem of vehicles is one of the concerns of major vehicle manufacturers and parts companies in the international auto industry. Statistics show that about 1 / 3 of vehicle failures are related to vehicle NVH problems, and nearly 20% of the R&D expenses of major companies are spent on solving vehicle NVH problems. [0003] Vehicle NVH performance is the intuitive feeling of drivers and passengers, which often directly affects consumers' purchase intention and user satisfaction. If the vehicle is suddenly compressed at a certain spe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G06F30/15G06F30/20G16C60/00G06F111/10G06F119/10G06F119/14
CPCG06F30/15G06F30/20G16C60/00G06F2111/10G06F2119/14G06F2119/10
Inventor 张宇毛祯熊升
Owner CHONGQING COLLEGE OF ELECTRONICS ENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com