Shuwen Zhou

Study on Cervical Spine Injuries in Vehicle Side Impact

This paper presents the development and study of a three-dimensional multi-body model of the 50th percentile male human and discretized neck for the study of cervical spine injuries in vehicle side impact. The neck is composed of cervical spine vertebrae, inter-vertebral discs, ligaments, and muscles. Following motor crash evaluations, an impactor with a deformable front end representing the front of a car was propelled straight ahead into the sides of the vehicles being assessed. A EuroSID-2 adult male dummy was seated on a sled, restrained using safety belt, and lateral velocity measured from side impact was applied to simulate cervical spine injuries. The results show that the methods used in this paper have the potential to provide a costeffective and versatile platform to examine local loadings on the cervical spine and soft tissues, including the kinetics and the kinematics of the cervical spine and its components, as well as the mechanical response of the intervertebral discs under other complex dynamic loading environment.

Vehicle dynamics control based on sliding mode control technology

The paper presents a vehicle dynamics control strategy devoted to prevent vehicles from spinning and drifting out. With vehicle dynamics control system, counter braking are applied at individual wheels as needed to generate an additional yaw moment until steering control and vehicle stability were regained. A sliding mode controller was designed to produce demanded yaw moment according to the error between the measured yaw rate and desired yaw rate. Vehicle dynamics control system utilizes the demanded yaw moment to calculate the brake torque on wheels respectively. With this improved control system, the vehicle can afford nice manoeuvrability and stability.

Fuzzy Logic Control for Vehicle Suspension Systems

An active suspension system for vehicles using fuzzy logic controls is presented in this paper. The model is described by a linear system with six degrees of freedom, subject to irregular excitations from the road surface. Based on control theory, the fuzzy control system of the active suspension is proposed. With the aid of software Matlab/simulink, a lot of simulation process is done. Simulation results indicate that the proposed active suspension system proves to be effective in the vibration isolation of the suspension system. Whats more, a mechanical dynamic animation of six-degree-of -freedom half body of vehicle suspension system is obtained, with the aid of software ADAMS and media player. The animation demonstrates the mechanism principle of suspension system more vividly and visually.

Lateral Stability Control of Car-Trailer Combination Based on 4WS

Rollover and jack-knifing of car-trailer combination on overtaking or obstacle avoidance under emergency are serious threats for motorists. A car-trailer combination model was built in this paper. The kinematics of car-trailer combination has been analyzed, and a 4 DOF model was built to act as the controller predictive model. The dynamics simulation for yaw rate following and anti-rollover has been performed on the dynamic car-trailer combination model. The results show that the lateral stability control based on four-wheel steering proposed in this paper can stabilize the car-trailer combination, rollover and jack-knifing are prevented from and the car-trailer combination more can follows accurately the drivers desired path.

Semi-active control on leaf spring suspension based on SMC

The leaf spring suspension is the most common heavy-duty-suspension for on-highway vehicles, primarily due to large carry capacity, better handling stability ability and low cost. The disadvantages of the conventional leaf spring include crude ride performance and a lack of flexibility in suspension design. In this paper the conventional leaf spring suspension was embed a semi-active control. The dynamics model of two DOF active suspension was built and analyzed, and was used in the semi-active leaf spring suspension as a reference model. With virtual prototyping, a full function heavy duty tractor was built and assembled in dynamics simulation software. The semi-active leaf spring suspension was controlled using sliding mode control to follow the vehicle body dynamic performance with active suspension. A bumpy road test was performed to verify the performance of the proposed semi-active leaf spring suspension. The results show that the semi-active leaf spring suspension can improve the ride performance of the heavy tractors.

Vehicle yaw stability control and its integration with roll stability control

The paper presents a vehicle yaw stability control (YSC) strategy devoted to prevent vehicles from spinning and drifting out. With yaw stability control system, counter braking was applied at individual wheels as needed until steering control and vehicle stability were regained. However, YSC system may not react properly to, or even deteriorate many on-road rollover events. An integration control system, vehicle dynamics control system (VDC), including yaw stability control and roll stability control was presented and discussed. With this improved control system, the vehicle can afford nice manoeuvrability and stability.

Study on stability control during split-mu ABS braking

Split-mu braking means that a vehicle brakes on a road surface with left right dissymmetrical friction coefficient. For most drivers, a heavy braking on split-mu road surface will cause vehicle to skid or spin or lose the steering control. In this paper, an active front steering control was designed to improve the maneuver stability while braking on split-mu road surface with four-channel Anti-lock Braking System which will produce an additional yaw torque to let the vehicle deviate from the straight direction but can achieve maximum braking force. A multi-body vehicle model was built to simulate and analyze the vehicle dynamics performance during braking on split-mu road surface. The simulation results show that the new control system integrated with active front steering and four-channel ABS can improve the vehicle lateral stability on split-mu road surface braking.

Study on Automatic Spray of Distribution Boom System of Truck-Mounted Concrete Pump

Truck-mounted concrete pumps have been adopted in many construction projects. However, the investigations about the automatization or robotization of distribution boom system of the truck-mounted concrete pump are very scattered. In this study, a scheme of automatic concrete spray of the distribution boom system of the truck-mounted concrete pump has been presented and discussed. The concrete spray process and the kinematics of the boom sections were analyzed including its inverse kinematics problem. Transient dynamic analysis was performed to validate the effect of the new control system on the boom system base on the flexible body co-simulation among ANSYS software, ADAMS software and Matlab/Simulink software. A three-dimensional simulation was programmed to imitate the process of automatic spray and verify the control algorithm. The simulation result shows that the system can pour concrete on a long narrow area automatically thereby satisfying, and the trajectory movement of boom mechanism.

Vehicle Control Strategy on High Speed Obstacle Avoidance under Emergency

The most important task for the driver in a vehicle running at high speed is to bypass the obstacle under emergency because of insufficient vehicle-to-vehicle distance. A vehicle dynamics control strategy was developed to prevent vehicles from spinning and drifting out on high speed obstacle avoidance under emergency. With vehicle dynamics control system, counter braking is applied at individual wheels as needed until steering control and vehicle stability are regained, i.e. the vehicle can pass by the obstacle. On the other hand, vehicle dynamics control system may increase the vehicle roll angle, or even deteriorate on-road rollover events. An anti-rollover control system was introduced in this paper to prevent vehicle from rollover. The simulation results showed that with this improved control system, the vehicle can afford nice manoeuvrability and passenger comfortability.