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A dynamic model of four degree-of-freedom four-wheel-steering vehicle is built. By using differential equations of motion of free rigid body, the steering and braking situation is considered and simulated. The results show that this model is close to the steering and braking situation.
Automotive steering mechanism is designed applying a theoretical method of robust optimization. A math modal on steering mechanism with clearances based on robust optimization is established. The movement precision in fourteen positions of steering mechanism during steering course is chosen as objective function. Distance between kingpins, axle-base, the bottom angle of trapezoid mechanism and the...
Aiming at analysing influence of chassis torsional stiffness on handling performance, we build a four degrees of freedom vehicle model that includes chassis torsional degree to study chassis roll distortion. Influence of chassis torsional stiffness on steady-state roll angle of front/rear suspension and transient understeer gradient are simulated. Through changing chassis torsional stiffness, we find...
Aimed at the key part for WC80Y separate transporting platform applied in carring successive coal-mining equipment in laneway, the operational principle of steering system was explained and the variable element PID closed-loop control system was set up which including variable displacement pump, proportioning valve steering mechanism and encoder on the base of CAN bus. Based on the field test result,...
In order to ease the contradiction between steel slag transportation and the development of steel mills equipment technology of domestic, the SPC90 slag pot carrier has been designed and developed. The maximum rated load of SPC90 Slag pot Carrier is 90 ton, which can cooperate with many kinds of bridge machine for the railway passenger transport special line to complete the corresponding works, and...
In Steer Release condition, due to the ability of actual vehicle to resist external small perturbations and self-Adaptive coordination can't be described in the previous vehicle model, the stability of vehicle is described insufficiently. A fine steering system model was established, including Stick-slip friction model and a complete dynamic system consist of wheels, axles, steering tie rod and rack...
Stability, rapidity and accuracy are very important performances in Electric Power Steering (EPS). In this paper, it was explained that the contradictions among these performances can't be avoided when using traditional feedback control methods. To resolve this problem, the EPS model and feed-forward control method were studied. And then, a fuzzy PID associate with feed-forward control algorithm was...
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