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This paper builds an automobile dynamic model, which analyzed typical traffic accidents while it is turning on the basis, as occurred on the bend surface at a high velocity. The paper analyzes the main factors which may have effect on the handling stability of vehicles, including vehicles turning characteristics, critical speed, tire pressure, tire mixed installation, center of gravity of the automobile,...
To suppress vehicle rollover and sideslip risk effectively, this paper adopts time AR model to forecast vehicle motion parameters. Based on the forecast parameters, control strategies are established to control the vehicle rollover through the process of control-by-wire steering controller and suppress the vehicle sideslip by means of inhibiting the increase of centroid cornering angle. The way of...
Lifting body configuration is one of the typical layouts of Common Aero Vehicle(CAV), and the multi-objective optimization design of the airframe for lifting body configuration can greatly improve the integrated performance of Common Aero Vehicle. This paper establishes a numerical modeling of reentry vehicle to calculate these performance indexes such as the aerodynamic, the aerodynamic heating,...
In order to solve the problem of excessive understeer of four-wheel -steering vehicle with zero mass-center side-slip angle and proportional control at high speed, using fuzzy logical control method, adding direct yaw moment control of four wheel steering to solve this question. a two DOF four-wheel-steering vehicle model with integrated control of steering angle and yaw moment was established. The...
Bus dynamics is analyzed and 4 degrees of freedom dynamics model is established according to basic dynamic characteristics of bus. The corresponding computer simulation program is developed by using Matlab software. From practical view, structural parameters which are impacted by bus maneuverability and stability such as tire cornering stiffness, steering wheel rotational inertia, steering transmission...
The structure of tumbler journal box orientation mode was widely used in the high speed EMU, as it has the excellence of the stiffness in longitudinal, lateral and vertical direction can be set respectively. The longitudinal stiffness and lateral stiffness of the journal box was supplied by the stiffness of the elasticity node of tumbler. The stability of the high speed vehicle has a big relation...
Inaccurate results are usually produced due to lack of precise dynamic parameters when analyzing the running stability of railway vehicles. In this paper, a new solution is proposed to conduct the running stability analysis of railway vehicles supported by their three-dimensional (3D) CAD models, which are realized based on the intrinsic mapping relationship between the dynamic model and the 3D CAD...
A car handling simulation model was built by using multibody dynamics software ADAMS/CAR. In the model, we have considered the front and rear suspension system, steering system and the tires model in detail. Designed to test vehicle handling and stability of the serpentine line of tests and the testing process simulation and the data processing, the real vehicle data and simulation data are in good...
A positive position feedback controller is modified and a new active vibration control technique is developed. Unlike the conventional positive position feedback, the new controller separates the damping and stiffness control using two parallel first order and second order compensators. The second order compensator has a damping ratio as low as the damping of flexible structure to provide periodic...
Various static and dynamic stability criteria have been defined in many researches. To estimate these stability margins, many sensors are required. Therefore, implementation on a real vehicle is an important factor for stability margins. In this paper, a modified dynamic energy stability margin measured with only a few sensors is suggested to facilitate implementation. The performance of the modified...
A vehicle nonlinear lateral and vertical dynamics model is built under crosswind disturbance. With the L2 -gain method of disturbance suppression, the nonlinear hinfin output feedback controller is designed for the integrated system of EPS/ASS with considerations of random road input and strong crosswind disturbance. Simulation results for driver-vehicle-road closed-loop system show that the designed...
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