Optimization design method for optimum damping ratio of secondary transverse suspension of high-speed rail vehicle

Abstract

The present invention relates to an optimization design method for an optimum damping ratio of a secondary transverse suspension of a high-speed rail vehicle, and belongs to the technical field of high-speed rail vehicle suspensions. The method comprises: constructing a yawing vibration optimization design simulation model of a secondary transverse suspension system by establishing a 1 / 2 vehicle body driving yawing vibration differential equation and using MATLAB / Simulink simulation software; obtaining an optimum damping ratio, based on comfort and based on safety, of the secondary transverse suspension system by taking a non-smooth random input in an orbit direction as input excitation and taking a smallest vibration acceleration root mean square of the vehicle body and wheel yaw motion as a design target; and further carrying out calculation to obtain the optimum damping ratio of the secondary transverse suspension system. As known from design examples and SIMPACK simulation verification, an accurate and reliable optimum damping ratio of the secondary transverse suspension system can be obtained by the method provided by the present invention, thereby providing a reliable design method for the damping ratio of the secondary transverse suspension of the high-speed rail vehicle. By use of the optimization design method for the optimum damping ratio of the secondary transverse suspension of the high-speed rail vehicle, the design level of the suspension system of the rail vehicle and comfort and safety of vehicle riding can be improved.

Description

technical field [0001] The invention relates to a high-speed rail vehicle mount, in particular to an optimal design method for the optimum damping ratio of the secondary lateral mount of the high-speed rail vehicle. Background technique [0002] The damping ratio of the secondary lateral suspension system has an important influence on the ride comfort and safety of high-speed rail vehicles, and its design or selection is an important parameter for designing the shock absorber valve system parameters of the secondary lateral suspension system. However, according to the available information, since the rail vehicle is a multi-degree-of-freedom vibration system, it is very difficult to perform dynamic analysis and calculation on it. At present, there is no system for the design of the damping ratio of the secondary lateral mount of the high-speed rail vehicle at home and abroad. Most of the theoretical design methods are to select a certain damping ratio based on experience (us...

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Problems solved by technology

However, according to the available information, since the rail vehicle is a multi-degree-of-freedom vibration system, it is very difficult to perform dynamic analysis and calculation on it. At present, there is no system for the design of the damping ratio of the secondary lateral mount of the high-speed rail vehicle at home and abroad. Most of the theoretical design methods are to select a certain damping ratio based on experience (usually the empirical damping ratio is 0.2 to 0.4), and then, with the help of computer technology, use the multi-body dynamics simulation software SIMPACK or ADAMS / Rail to optimize through solid modeling and determine its size, although this method can obtain more reliable simulation values, so that the vehicle has better dynamic performance, however, with the continuous increase in the speed of rail vehicles, people put forward the design of the damping ratio of the secondary lateral suspension Higher requirements, the current method for the design of the damping ratio of the secondary lateral mount cannot provide an innovative theory with guiding significance, and cannot meet the development of the design requirements of the shock absorber under the condition of continuous speed increase of rail vehicles

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