Modeling and Simulation of a Displacement Controllable Active Suspension System

Abstract

Active suspension can adapt itself to the rigidity and the damping characteristics based on the vehicle dynamic state and the road condition, making the suspension in the best state of shock absorbing, which can increase the handling stability, the ride comfort and the passing ability of vehicles. As for strikingly rugged roads like off-road conditions, the traditional active suspension can hardly balance the contradiction between the wheel adhesion and the vertical accelerated speed of the body. In this paper, an active suspension in which the position of the vehicle body can be adjusted is proposed. In the proposed suspension, a series of electric cylinders are installed, which can actively adjust the position between the vehicle body and the suspension in order to achieve the purpose of controlling the relative body-wheels position. In this manner, AMESim is used to set up three suspension designs which include suspension supporter adaptation equipment with different locations in the system. Through simulation analysis, the paper has explored the feasibility of the vehicle attitude control of the three suspension designs under off-road conditions. The results proved that the active suspension system with adjustable body position can restrain the body roll or pitch efficiently in which this technology can be applied to the body attitude control when ORVs are at high speed.

Transient Response Performance Test on Aftermarket Motorcycle Rear Suspension in Indonesia

“…The damping ratio can be obtained from the comparison of critical damping with the damping that occurs in the system. The value of critical damping is (5) where is the spring constant and is the mass of the vehicle, so the damping ratio can be obtained by (6) The suspension being tested is likely to experience an underdamped transient response. The analysis carried out is the underdamped transient response equation.…”

“…The large displacement makes the vehicle difficult to drive and uncomfortable. Previous research has tried to control the displacement and car body mass estimator on the vehicle so that the vehicle's performance becomes better [5], [6]. The result can reduce the displacement of vehicles with wheels.…”

The research and verification of In-Arm Torsional Electromagnetic Active Suspension

“…24 This project adopts the type of displacement controllable active suspension tactics in order to maximize the advantages. 25…”

“…According to the blocking scheme, the transform function from U a to u m shows in equation (23) and the transform function from u m to u L shows in equation (24). Then, the transform function from U a to u L obtains as equation (25).…”

“…24 This project adopts the type of displacement controllable active suspension tactics in order to maximize the advantages. 25 This paper adopts the most typical and practical control system-PID control, to testify the function of active displacement control in ITEAS. In modern control theory, PID control has a simple structure, robustness, and adaptability that satisfies the requirements of the control strategy.…”