Optimization design method for secondary vertical suspension optimal damping ratio of high-speed railway vehicle

Abstract

The invention relates to an optimization design method for the secondary vertical suspension optimal damping ratio of a high-speed railway vehicle, and belongs to the technical field of high-speed railway vehicle suspension. The method comprises the steps that a vertical vibration optimization design simulation model of a secondary vertical suspension system is constructed, track vertical profile irregularity random input is taken as the input excitation, the vibration acceleration root-mean-square value minimum of vertical motion of a vehicle body and a truck frame is taken as the design objective, the best damping ratio, based on the comfortability and safety, of the secondary vertical suspension system is obtained through the optimization design, and then the secondary vertical suspension optimal damping ratio is obtained through calculation. According to the method, through the design example and SIMPACK simulation verification, it can be known that the accurate and reliable optimal damping ratio value of the secondary vertical suspension system can be obtained, and the reliable design method is supplied to the design of the secondary vertical suspension damping ratio of the railway vehicle; by utilizing the method, not only can the suspension system design level and the vehicle riding comfortability and safety of the high-speed railway vehicle be improved, but also the product design and test cost can be lowered.

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.

Images