Optimal Design Method for Optimum Damping Ratio of Secondary Vertical Mounts of Low-speed Rail Vehicles

Abstract

The invention relates to an optimal design method for the optimal damping ratio of a secondary vertical mount of a low-speed rail vehicle, and belongs to the technical field of low-speed rail vehicle mounts. The present invention builds the vertical vibration optimization design simulation model of the secondary vertical suspension system by establishing the four-degree-of-freedom running vertical vibration differential equation of the 1 / 4 car body of the low-speed rail vehicle, and utilizes the MATLAB / Simulink simulation software, and uses the track The random input of high and low irregularities is used as the input excitation, and the minimum root mean square value of the vibration acceleration of the vertical motion of the car body is the design goal, and the optimum damping ratio of the secondary vertical suspension system of the low-speed rail vehicle is obtained through optimization design. Through the design example and SIMPACK simulation verification, it can be seen that the method can obtain the accurate and reliable optimal damping ratio of the secondary vertical mount, and provides a reliable design method for the design of the damping ratio of the secondary vertical mount of low-speed rail vehicles. Using this method can not only improve the design level of the low-speed rail vehicle suspension system and the ride comfort of the vehicle, but also reduce product design and test costs.

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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