Method, device and realization device of acquiring excitation load

Abstract

The invention provides a method, a device and a realization device of acquiring road excitation load. The method can be applied to the analysis of a vehicle's NVH performance, including acquiring roadparameters such as road grade and frequency range to be analyzed. According to road grade, the corresponding power spectral density function of road surface is selected. And according to the frequency range to be analyzed and power spectral density function, the device acquires road excitation load, including the frequency domain spectrum of road roughness. The invention reduces the cost and thecomplexity of acquiring road excitation load.

Description

technical field [0001] The invention relates to the technical field of road vibration and noise analysis, in particular to a method, device and realization device for acquiring road surface excitation load. Background technique [0002] The road excitation load can be used as an input parameter for road vibration and noise simulation analysis and NVH (Noise, Vibration, Harshness, noise, vibration and acoustic roughness) performance development of vehicles; the frequency domain spectrum of road surface roughness can be used as a kind of road excitation load way of expression. In the reliability test of the vehicle, a sextant can be used to detect the wheel center force on the vehicle, and the wheel center force can be used as the road surface excitation load; the excitation frequency of the road surface excitation load that can be obtained in this method can reach up to about 40Hz, and The upper limit of the load frequency required in road noise analysis and NVH performance ...

AI Technical Summary

Problems solved by technology

In the reliability test of the vehicle, a sextant can be used to detect the wheel center force on the vehicle, and the wheel center force can be used as the road surface excitation load; the excitation frequency of the road surface excitation load that can be obtained in this method can reach up to about 40Hz, and The upper limit of the load frequency required in road noise analysis and NVH performance development is high (usually around 200Hz), so it is impossible to use a sextant to obtain road surface excitation loads in road noise analysis and NVH performance development

[0003] At present, the road excitation load acquisition methods used in road noise analysis and NVH performance development mainly include the direct method and the inverse matrix method; the direct method is to directly measure the roughness (vertical displacement) of the actual road surface as the excitation load. The unevenness of the road surface is directly scanned by laser detection equipment and other means, which requires special test road surface and data acquisition equipment, which is expensive and time-consuming; the inverse matrix method is used to measure the vibration response of the suspension when the vehicle is driving on the road. Combined with the vibration transfer function from the road surface to the response point, the inverse matrix method is used to reversely calculate the road load; however, this method requires a fixed test road surface and a prototype vehicle, which cannot be carried out in the early stage of vehicle development (the stage without a prototype vehicle). Carry out road vibration and noise NVH simulation analysis optimization and performance risk control in the early stage of development, resulting in the quality, progress, cost and other systems may pay a large price in the prototype vehicle tuning stage, greatly increasing R&D costs and development risks, resulting in lower R&D efficiency Low

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