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

An optimal damping ratio, secondary vertical technology, applied in calculation, mechanical equipment, special data processing applications, etc., can solve problems such as no theoretical design method given for the system, difficulties in dynamic analysis and calculation, etc., and shorten the product Design cycle, reduce product design and test costs, improve the effect of vehicle ride comfort

CN105183984BInactive Publication Date: 2018-01-19SHANDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-01-19
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0024] specific implementation plan

[0025] The present invention will be further described in detail through an embodiment below.

[0026] The full load mass of a 1 / 4 single-section car body of a low-speed rail vehicle m 2 =14228kg, half of the mass of a single bogie frame m 1 =1155kg; The vertical equivalent stiffness K of each axle box positioning device 1 =1.48×10 6 N / m; the stiffness K of the secondary vertical suspension 2 =561.68kN / m; End connection stiffness K of the secondary vertical shock absorber d2 =20×10 6 N / m; the damping ratio of the secondary vertical suspension to be designed is ξ, where the equivalent damping coefficient of the secondary vertical shock absorber The vehicle speed v=100km / h required by the design of the damping ratio of the secondary vertical mount of the low-speed rail vehicle is designed for the optimal damping ratio of the vertical mount of the low-speed rail vehicle secondary.

[0027] The optimal design method of the optimal damp...