Li Xin Guo

The Synthetic Evaluation Method of the Dynamic Performance and Economic Performance of Battery Electric Vehicle Based on Principal Component Analysis

The dynamic index and economic index of battery electric vehicles are mutual related as well as opposite. So they should be evaluated synthetically. From the analysis of literatures, the maximum speed, accelerating ability and driving range are chosen as the synthetic evaluation index. By the method of principal component analysis, the synthetic evaluation model of the dynamic and economic performance of battery electric vehicle is established. And example is used to explain the application of the model.

Modelling and analyses of WSN-based pursuit-evasion strategies for multi-pursuers to multi-evaders

Wireless sensor networks have yielded a lot of new theoretical problems for the localisation, tracking and navigation control of mobile objects within a local area, especially, for investigations of pursuit-evasion games. For the efficiency of capture and evasion of pursuers and evaders in pursuit-evasion games, several novel pursuit-evasion policies are proposed in this study. The vector-ward evasion strategy may bring the evader breaking away from the puzzledom between two fires and reduce fluctuation of evasion routes. The intelligent collaboration pursuit strategy effectively exerts the collaboration efficiency of multiple pursuers and shortens the capture time. The estimated location errors caused by wireless sensor networks were also involved for the pursuers and evaders in the simulation of this study. The results show that every pursuit-evasion strategy is valid and robust. In the simulation of multiple pursuers to capture multiple evaders, the object assignment method and the corresponding pursuit policies are reliable and can capture all evaders in a limited area as quickly as possible.

Vehicle Dynamics Control for Tractor Semitrailer Lateral Stability

Rollover and jack-knifing of tractor semitrailer on high speed obstacle avoidance under emergency are serious threats for motorists. A tractor semitrailer model was built with multi-rigid-body method in this paper. The steering performance of tractor semitrailer has been analyzed, as well as the stability control theory, including yaw rate following, anti-rollover. The dynamics simulation for yaw rate following and anti-rollover has been performed on the dynamic tractor semitrailer. The results show that the vehicle dynamics control proposed in this paper can stabilize the tractor semitrailer, rollover and jack-knifing are prevented and the tractor semitrailer more accurately follows the drivers desired path.

The Research of Vehicle Seat Dynamic Comfort Characteristic

Increasing consumption of the automobile make vehicle seat comfort characteristic paid more attention to. Damping performance as the third important factors is not allowed to ignore. A three freedom human - seat system model has been created for simulation. The result show that as the natural frequency f0 improved, the two resonance peak frequency of the system also improved, the growth of the first order resonance frequency is quite obvious, the second is less growth. And the higher the f0 the less change is. With the improvement of f0, the first order resonance peak to peak value obviously reduced, and the second order resonance peak to peak value increased. So, it is said that the higher the f0 the poor damping effect in high frequency area. The influence of ξ for the damping ratio of work frequency is not big, but the influence for the amplitude value is significant. Increase the natural frequency can make phase angle decreased when resonance, but the change of damping ratio, do not have obviously changes.

Influence of Lateral Interval on Aerodynamics Characteristics of Crossing Vehicles

The investigations about vehicle crossing process mainly use numerical simulation methods and, moreover, the relevant investigation is quite less. In this study, a three- dimensional fluid simulation model was established. By moving mesh technique, the three- dimensional transient simulation for vehicle crossing process was finished. The aerodynamics characteristics of vehicle crossing process with different lateral interval distances were analyzed. The analytical results show that the smaller the lateral interval distance, the more the transverse thrust between two vehicles during the crossing process. During the whole crossing process, the lateral force shows itself with repulsion in the beginning and attraction in the end. When the lateral interval distance of crossing is very small, the air disturbance due to crossing not only makes large affection to the lateral force but also influence obviously the positive pressure area of the front car bodywork.

Finite Element Modeling and Harmonic Analysis of the Bus Bodywork

The characteristics of vibration and noise of an automobile have become important factors for evaluating automobiles. In this study, finite element modal analysis and harmonic analysis were used to analyze the dynamic characteristics of the bus bodywork. The analytical results show that vibration of ceiling board and floor board is large while the engine remains the idle running. The vibration of ceiling board and floor board are large during the engine running with the idle speed or the highest speed. In addition, the vibration of ceiling board and floor board also has peak values during the engine running with the maximum torsion moment. Therefore, for prediction of vehicle bodywork vibration and vehicle interior noise, the influence of the engine vibration on them should be considered in order to avoid resonance of bodywork boards and coupling of bodywork boards and interior acoustic field.

Multi-Object Control of Active Suspension Subject to Parameter Uncertainties under Non-Stationary Running

Based on the building of non-stationary road surface excitation mode, a study on the active suspension control under non-stationary running condition was conducted using control, state feedback control strategy for linear systems with time-domain hard constraints was propose. The proposed approach was applied to design active suspension systems on the basis of a two-degree-of-freedom quarter car mode, Simulation results show that the proposed constrained controller can achieve a promising improvement on ride comfort, while keeping dynamic suspension deflections, dynamic tire loads and control forces within given bounds, even non-stationary running.

Static and Dynamic Finite Element Analysis on the Steering System of Automobiles

The steering system of automobiles might vibrate under external excitation loading. Severe vibration of the steering system maybe bring the drivers uncomfortable and even result to noise and damage of some parts of the steering system. In the same time, it can not be satisfied with NVH design requirement of automobiles. In this study a three- dimensional finite element model of a steering wheel of automobiles was established and finite element static and dynamic analyses were conducted in order to validate dynamic characteristics and strength of the steering system. The simulation results can provide a reference for structural design of the steering system.

The Parameters Sensitivity Analysis of Battery Electric Vehicle Dynamic Performance

Battery electric vehicle is to be researched and developed as the best alternative for fuel vehicle. Dynamic performance is the basic performance of a vehicle. In the prior period of research and development, studying on the sensitivity of relevant parameters to dynamic performance can determine the degree of influences that the relevant parameters have on it. This paper establishes mathematical model for the dynamic performance of battery electric vehicle, and deduces computational methods of the dynamic parameters sensitivity. Improving these parameters will provide the basis for improving the dynamic performance of battery electric vehicle.

Three-Dimensional Finite Element Modeling and Front Crash Process Analysis of Car Bodywork

Traffic accidents cause to a large quantity of personnel casualty and economic loss every year. The safety in vehicle crash has been one of important criterions in vehicle design. In this study a three-dimensional finite element model was established and the front crash process of car bodywork was analyzed. The simulation results show that the structure design of car bodywork is reasonable and of safety for the passengers. The investigation of this study not only validates the rationality of the car bodywork design but also provides a detailed numerical simulation model for further investigation as well as improvement and optimization of the car bodywork structure.