Vehicle dynamic balance tensioning method and tightening device on drum test bench in anechoic chamber

Abstract

The invention provides a vehicle dynamic balance tensioning method and a vehicle dynamic balance tightening device on a chassis dynamometer in an anechoic room. The vehicle dynamic balance tensioningmethod comprises the steps of: establishing a coordinate system, calculating pre-tightening force initial values of four steel chains connected to front and rear traction rods of a vehicle according to a vehicle driving force and a vehicle stress state when the vehicle is stationary on the chassis dynamometer, and pre-tightening the steel chains; running the vehicle according to a specified working condition; acquiring tension of the four steel chains in real time; retarding a condition that a resultant external force in an inertia balance force system is zero as a constraint condition, regarding the square minimization of a resultant external moment as an objective function, and calculating tension adjustment values of the four steel chains, so as to adjust tension of the steel chains; and launching a noise test when determining that the objective function is less than a set value. The vehicle dynamic balance tensioning method and the vehicle dynamic balance tightening device realizethe balanced fixation of a tested vehicle on the chassis dynamometer, reduce the possibility of vehicle swing and lateral friction between tyres and the surface of a drum in the testing process, reduce the additional tyre noise, provide a more realistic simulation environment for indoor noise measurement, and improve the measurement precision.

Description

technical field [0001] The invention belongs to the technical field of vehicle testing, and in particular relates to a vehicle dynamic balance tensioning method and a tightening device on a drum test bench in an anechoic chamber. Background technique [0002] The indoor pass-by noise measurement method is widely used by automobile manufacturers for the occurrence mechanism of pass-by noise, noise source characteristics, transmission path conditions, component contribution analysis, etc. Indoor pass-by noise measurement is usually carried out in an anechoic chamber equipped with a drum test bench. When the vehicle is measured on the drum test bench for vehicle pass-by noise, the test conditions include acceleration, constant speed and coasting. The four wheels of the test vehicle are placed on the test platform and the surfaces of the four cylindrical drums are actively or passively rotated relative to each other to complete the three working conditions of acceleration, const...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a dynamic balance tensioning method and a tightening device for a vehicle on a drum test bench in an anechoic chamber, which are used to solve the problems caused by noise testing of vehicles in the prior art. The difference in the eccentric position of the tow bar caused the vehicle to vibrate significantly during the test, resulting in additional noise from the tires

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