Analytic calculating method for optimal damping ratio of secondary vertical suspension of low-speed rail vehicle

Abstract

The invention relates to an analytic calculating method for the optimal damping ratio of a secondary vertical suspension of a low-speed rail vehicle and belongs to the technical field of vehicle suspensions of low-speed rail vehicles. A 1 / 4 vehicle body four-degree-of-freedom running vertical vibration model of the low-speed rail vehicle is established, a target function of the optimal damping ratio of the secondary vertical suspension is established based on a random vibration theory, analytic calculating is conducted, and therefore the optimal damping ratio of a secondary vertical suspension system of the low-speed rail vehicle is obtained. It can be known through a design example and SIMPACK simulation verification that the accurate and reliable optimal damping ratio of the secondary vertical suspension system can be obtained, and the reliable design method is provided for design of the damping ratio of the secondary vertical suspension of the low-speed rail vehicle. By means of the method, the design level and the product quality of the suspension system of the low-speed rail vehicle can be improved, and the riding comfort of the vehicle is improved; meanwhile, the product designing and testing cost can also be reduced, the product design period is shortened, and the international market competition ability of the track vehicle of China is improved.

Description

technical field [0001] The invention relates to a low-speed rail vehicle mount, in particular to an analytical calculation 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, there has been no design of the damping ratio of the secondary vertical suspension of the low-speed rail vehicle at home and abroad. The analytical calculation method of the system mostly selects a certain damping ratio according to experience (usually the emp...

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, there has been no design of the damping ratio of the secondary vertical suspension of the low-speed rail vehicle at home and abroad. The analytical calculation method of the system mostly selects 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, the multi-body dynamics simulation software SIMPACK or ADAMS / Rail is used to carry out solid modeling. Optimizing and determining its size, although this method can obtain more reliable simulation values, so that the vehicle has better dynamic performance, however, with the continuous development of the rail vehicle industry, people put forward the design of the damping ratio of the secondary vertical suspension Therefore, 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 requirements of the shock absorber design under the rapid development of rail vehicles.

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