A Simulation Method of Dynamic Characteristics of Air Suspension Considering the Air Suspension Filling and Deflating the Altitude Valve

Abstract

The invention discloses a method for simulating the dynamic characteristics of an air suspension considering the filling and deflation of a height valve, which includes: obtaining the characteristic parameters of the air suspension system; establishing an air spring model and a height valve model under the action of filling and deflation; The gas mass flow rate results obtained from the valve model are input as the air spring model; the rigid body model of each component of the air suspension is established, and the three-dimensional model of the stabilizer bar is imported into the finite element pre-processing software; each air spring is represented by a unidirectional force model, And measure the height of the air spring; assemble the vehicle simulation model; measure the suspension height: export the vehicle simulation model, set the input variables of the air spring model and the input variables of the height valve model; set the simulation parameters, start the simulation, and get Simulation calculation results of the dynamic characteristics of the air suspension. The invention combines the multi-body dynamics method, utilizes the three-dimensional digital model and characteristic parameters of the air suspension, establishes a simulation model and obtains the dynamic characteristics of the air suspension system through simulation analysis.

Description

technical field [0001] The invention relates to a dynamic characteristic simulation method of an air suspension considering the filling and deflation of a height valve, and belongs to the field of optimal design of the air suspension. Background technique [0002] Air suspension is widely used in the automobile and railway industries due to its excellent performance. Due to its low stiffness, it can make the vehicle obtain an ideal natural frequency, obtain good ride comfort and reduce damage to the road surface. At the same time, the air suspension has the characteristics of inflatable and deflated, which can realize the adjustment of the suspension height. [0003] The height valve is an important component of the air spring suspension system. It is installed between the frame and the axle. Its main function is to control the inflation and deflation of the air spring according to the change of the load and the height of the vehicle body, so as to keep the height of the veh...

AI Technical Summary

Problems solved by technology

This method does not consider the effect of the inflation and deflation of the height valve on the stiffness of the air spring, which will cause inaccurate actual results

[0005] Although some known methods for analyzing the dynamic characteristics of the suspension consider the effect of the height valve on the inflation and deflation of the air spring, they ignore the influence of the suspension structure on the dynamic characteristics. Yang Chen in "Modeling, Control, and DesignStudy of Balanced Pneumatic Suspension for Improved Roll Stability in Heavy Trucks" proposed a dynamic simulation method based on a nine-degree-of-freedom vehicle model, which considered the impact of the height valve filling and deflation on the air spring in the vehicle model, but this model has no The actual vehicle has been oversimplified, for example, the specific structure of the suspension is not considered, but it is only considered as a spring-damping system, and the specific structure of the suspension will affect the roll center of the suspension, roll angle stiffness, etc. to reflect the suspension The performance index of the frame affects the dynamic characteristics of the vehicle, and the analysis results of the simplified nine-degree-of-freedom vehicle model are not accurate enough

[0006] In the design process of the above-mentioned air suspension, the influence of the specific structure of the air suspension and the inflation and deflation of the height valve on the stiffness of the air spring is not considered at the same time, which will cause inaccurate actual results

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