Optimum design method for secondary vertical suspension optimal damping ratio of low-velocity railway vehicle

Abstract

The invention relates to an optimum design method for the secondary vertical suspension optimal damping ratio of a low-velocity railway vehicle, and belongs to the technical field of low-velocity railway vehicle suspension. Through establishing a 1 / 4 vehicle body four-freedom-degree driving vertical vibration differential equation of the low-velocity railway vehicle, MATLAB / Simulink simulation software is utilized for constructing a vertical vibration optimum design simulation model of a secondary vertical suspension system, and with railway vertical irregularity random input being input stimulation, and the minimum vibration acceleration root-mean-square value of vehicle body vertical movement being a design target, the optimal damping ratio of the secondary vertical suspension system of the low-velocity railway vehicle is obtained through optimum design. Through a design example and SIMPACK simulation verification, the reliable and accurate optimal damping ratio of secondary vertical suspension can be obtained through the method, and the reliable design method is provided for design of the damping ratio of secondary vertical suspension of the low-velocity railway vehicle. By the utilization of the method, the design level and vehicle riding comfort of the suspension system of the low-velocity railway vehicle can be improved, and product design and test costs can further be lowered.

Description

technical field [0001] The invention relates to a low-speed rail vehicle mount, in particular to an optimal design method for the optimum damping ratio of a secondary vertical mount of a low-speed rail vehicle. Background technique [0002] The damping ratio of the secondary vertical suspension system has an important impact on the ride comfort and safety of low-speed rail vehicles, and its design or selection is an important parameter for designing the valve system parameters of the secondary vertical shock absorber. However, according to the information obtained, it is very difficult to analyze and calculate the dynamics of the rail vehicle because it is a multi-degree-of-freedom vibration system. At present, no systematic theory has been given for the design of the damping ratio of the secondary vertical suspension Most of the design methods are to select a certain damping ratio based on experience (usually the empirical damping ratio is 0.2-0.45), and then, with the help...

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Problems solved by technology

However, according to the information obtained, it is very difficult to analyze and calculate the dynamics of the rail vehicle because it is a multi-degree-of-freedom vibration system. At present, no systematic theory has been given for the design of the damping ratio of the secondary vertical suspension Most of the design methods are to select a certain damping ratio based on experience (usually the empirical damping ratio is 0.2-0.45), and then, with the help of computer technology, use the multi-body dynamics simulation software SIMPACK or ADAMS / Rail to optimize and determine through solid modeling Although this method can obtain relatively reliable simulation values ​​and make the vehicle have better dynamic performance, however, with the continuous development of the rail vehicle industry, people put forward higher requirements for the design of the damping ratio of the secondary vertical suspension. The current design method for the damping ratio of the secondary vertical suspension cannot provide an innovative theory with guiding significance, and cannot meet the development of the shock absorber design requirements under the rapid development of rail vehicles.

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