Abstract
Using the magnetorheological (MR) damper model, this paper derives a semiactive suspension model for a high-speed railway vehicle, and a new evaluating method is proposed to analyze the effect of two kinds of time delay existing in control systems on vehicle dynamic performance. The railway vehicle is modeled by a 50 degree-of-freedom (DOF) system which considers the full 6 DOF of each wheelset, bogie, car body, and the pitch angle of each axle box. Several control strategies, sky-hook (SH), acceleration-driven damping (ADD), and mixed SH-ADD, are considered in the semiactive suspension system. To evaluate the effect of these semiactive controls and the different kinds of time delay on the lateral ride index of a high-speed railway vehicle, a 3D surface in a rectangular coordinate system is described. The cross curve between the 3D surface and a horizontal plane which represents the performance of passive suspension is projected on the X-Y plane, and the area enclosed by the contour line, X-axis, and Y-axis can be used to evaluate the performance of semiactive controls. The results show that the new method is convenient to evaluate the performance of semiactive control strategies visually when there is more than one kind of time delay.
Highlights
We find that mixed SH-accelerationdriven damping (ADD) control can transition from SH to ADD smoothly at the crossover frequency point, which indicates that the conversion between SH and ADD defined in Equation (13) is successful. erefore, mixed SHADD control can perform well in all frequency domains; the validation of its performance in the high-speed railway vehicle model is performed later
According to the difference of generation mechanism, the time delay is classified into collection time delay and execution time delay
According to the simulations and analyses, the following conclusions can be drawn: (1) According to the different effects of collection time delay and execution time delay on system performance, take the effect of collection time delay as the row vector and the effect of execution time delay as the column vector. e effect of two kinds of time delay on the dynamic performance of the system can be drawn as 3D surfaces; there is a crossing curve between this surface and the plane of passive control; if we project this curve to the X-Y plane, the effective region of semiactive control under different control strategies can be drawn at last
Summary
It is necessary to analyze the effect of time delay in the semiactive control system on the ride index of high-speed railway vehicles. E different effects of two time delays in the semiactive control system are compared, and a new analysis method based on 3D curve surface figures is proposed to evaluate the effect of the time delay on the riding comfort of high-speed railway vehicles. Is paper is organized as follows: In Section 2, a 50DOF vehicle model based on China’s high-speed railway vehicles is built using VI-Rail and is validated and evaluated using multiple dynamic performance indices, such as the nonlinear critical speed, ride index, derailment index, and wheel unloading rate.
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