Optimal design method for optimal damping ratio of secondary vertical mounts of high-speed rail vehicles

Abstract

The invention relates to an optimal design method for the optimal damping ratio of a secondary vertical mount of a high-speed rail vehicle, and belongs to the technical field of high-speed rail vehicle mounts. The present invention constructs the vertical vibration optimization design simulation model of the secondary vertical suspension system, takes the random input of track height irregularity as the input excitation, and takes the minimum root mean square value of the vibration acceleration of the vertical motion of the car body and bogie frame as The design goal is to optimize the design to obtain the optimal damping ratio of the secondary vertical mount system based on comfort and safety, and then calculate the optimal damping ratio of the secondary vertical mount. 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 system, and provides a reliable design method for the design of the damping ratio of the secondary vertical mount of rail vehicles. Using this method can not only improve the design level of the suspension system of the high-speed rail vehicle and the ride comfort and safety of the vehicle, but also reduce the product design and test costs.

Description

technical field [0001] The invention relates to a high-speed rail vehicle mount, in particular to an optimal design method for the optimal damping ratio of the secondary vertical mount of the high-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 high-speed rail vehicles, and its design or selection is an important parameter for the design of the shock absorber valve system parameters of the secondary vertical suspension system. . 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, the design of the damping ratio of the secondary vertical suspension of the high-speed rail vehicle has not been given at home and abroad. Most of the theoretical design methods of the system are to select a certain damping ratio accord...

AI Technical Summary

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, the design of the damping ratio of the secondary vertical suspension of the high-speed rail vehicle has not been given at home and abroad. Most of the theoretical design methods of the system are to select a certain damping ratio according to 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, through solid modeling. Optimizing and determining its size, although this method can obtain relatively reliable simulation values, so that the vehicle has better dynamic performance, however, with the continuous increase in the speed of rail vehicles, people's design of the damping ratio of the secondary vertical suspension Higher requirements are put forward. The current method for the design of the damping ratio of the secondary vertical suspension 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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