Real-time generating method for unevenness of double-rut smoothing pavement

Abstract

The invention discloses a real-time generating method for unevenness of a double-rut smoothing road in the technical field of vehicle dynamics. With a time delay type coherent transfer function model having a few of fitting parameters, a phenomenon of decreasing of the coherent function from 1 to be close to 0 under the condition of spatial frequency increasing of the pavement can be expressed accurately. With a time delay type incoherent transfer function model, a phenomenon of increasing of an incoherent function from 0 to be close to 1 under the condition of spatial frequency increasing of the pavement can be expressed accurately. Left and right rut pavement unevenness excitation heads provide real-time pavement unevenness values at different vehicle driving speeds to realize combination of the time delay type coherent transfer function model and a white noise module. Real-time double-rut pavement unevenness control signals are provided for pavement unevenness excitation heads of a vehicle road simulation test system and thus the left and right excitation heads at a test rack generate double-rut smoothing pavement unevenness in real time. Therefore, the workload of generating the left and right rut pavement unevenness is reduced and the precision is high.

Description

technical field [0001] The invention belongs to the technical field of vehicle dynamics, and in particular relates to a method for real-time generation of the roughness of the smooth road surface of the double track of the automobile. Background technique [0002] Dynamic simulation and bench test are important tools for automobile research and development. Road roughness is an unavoidable external disturbance for automobiles, and it has an important impact on the ride comfort, durability and rollover stability of automobiles. The modeling of road surface roughness is mainly divided into two aspects: single wheel rut modeling and double wheel rut modeling. The modeling method of single wheel rut road surface roughness usually uses a stationary Gaussian model, and formula (1) is used to express the road surface roughness, which can be generated in real time by MATLAB / Simulink software, which is very convenient for real-time simulation of vehicle dynamics and for vehicle road ...

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Problems solved by technology

[0011] The present invention aims at the problem that the existing coherent transfer function model cannot be used together with the white noise module to generate the roughness of the dual-track smooth road on-line in real time, and proposes a vehicle dual-track smooth road surface based on a time-delay type coherent function model The real-time generation method of road surface roughness is used to realize the time-delay coherent transfer function model and the white noise module to provide real-time double-rut road surface roughness control signals for the road surface roughness excitation head of the vehicle road simulation test system, and then make the The left and right excitation heads of the test bench generate double ruts in real time to stabilize the unevenness of the road surface

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