Vehicle active suspension system vibration control method based on specified performance function

Abstract

The invention relates to a vehicle active suspension system vibration control method based on a specified performance function, belonging to the field of vehicle engineering. The method comprises: firstly establishing a dynamics model of a vehicle active suspension according to the automobile dynamics theory and the Newton's second law of motion; then designing a performance function, to make thevertical displacement, the roll angle and the pitch angle to be converged into the boundary of the performance function; equivalently converting the vertical displacement, the roll angle and the pitchangle to conversion errors by applying the inverse function; and finally, designing the control law in the vertical, roll and pitch directions through the conversion errors, and carrying out active vibration control over the entire vehicle suspension. The vehicle active suspension system vibration control method based on the specified performance function is close to the real vehicle condition, the transient-state and steady-state performance of the suspension system is ensured, and the robustness of the system is improved. For the complex nonlinear system of the vehicle suspension system, the control strategy based on the specified performance function avoids complex operations of the system, such as the accurate modeling process and the neural network on-line calculation, the design issimple, and the calculation amount is small.

Description

technical field [0001] The invention relates to a vibration control method of an active suspension system of a whole vehicle based on a specified performance function, and belongs to the field of vehicle engineering. Background technique [0002] With the rapid development of the vehicle field, people have higher and higher requirements for vehicle ride comfort and handling stability and other performance indicators, and the suspension system is the most important vibration-absorbing component of the vehicle, and its performance directly determines the performance of the vehicle. Overall performance is good or bad. Therefore, the research on the vehicle suspension system is of great significance. Due to the large number of parameters of the vehicle model, most scholars use the quarter vehicle model and the half vehicle model when studying the suspension vibration, and the quarter vehicle model has no coupling, and the half vehicle model has no coupling. Considering the rol...

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Problems solved by technology

[0003] For the nonlinear system with complex cascading and coupling such as the vehicle active suspension system, some commonly used control strategies are complex in design and require a large amount of calculation, and it is difficult to guarantee the transient performance of the system. Therefore, it is necessary to design a simple , A control strategy that can specify the performance to ensure the stability of the system

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