Applied Mechanics and Materials Vols. 505-506

Abstract: The high-level driving simulators generally involve motion platform. This paper describes the design and development of a 6DOF hydraulic motion platform for vehicle driving simulator. Firstly, the structure and kinematic model of the platform are introduced. Then, the speed characteristics of the hydraulic cylinders by using different positive and negative voltage are studied. Because the cylinder startup time and hydraulic pump pressure will both affect the platform's final position, so a real-time platform control method according the sensor feedback is described. Finally, commonly used control functions of the platform are listed. The simulator and the motion platform run well by using this control method.

Abstract: the compressor bracket of car air conditioner frequently breaks and fatigue failure of its welding beam frequently occur in the vibration fatigue test. In order to solve these problems, the static stress and displacement distribution of mounting bracket are given under the effect of different acceleration by using FEM software in the paper. Simulation results show that revised design of the mounting bracket achieves success and its stiffness, strength and fatigue life satisfy the requirements of vibration test.

Abstract: The compositive crash model is built including dummysafety belt retrains system and the whole bus frame to research the crash worthiness of a cab-over-engine medium bus. With the crash regulations on M1 type bus, the frontal crash process is simulated. The deformations and acceleration of the parts and whole frame are analysised. For the hybridIII50 male dummy, the movement distance of dummy with safety belt and the injury values including headneckbreast and leg are solved. A comprehensive appraisement of crash worthiness is achieved.

Abstract: Electric bicycles (EBs) are now becoming the main vehicles for short-distance trips because of their speediness, flexibility and convenience in many cities in China. However, these benefits come at a cost. This study analyzed the energy consumption and emission of pollutants at every stage of the EB life cycle (production, use, maintenance and recycling) by using Life Cycle Assessment (LCA). The environmental impacts and the energy consumption in production and use were quantified and compared with other competing modes of transport, such as bicycles, buses, motorcycles and cars. The results show that the energy consumption and emissions of pollutants by EBs occur mainly in the use stage, and specifically in the process of electricity production and battery change. The emissions of pollutants by EBs per person per kilometer are several times smaller than the values for motorcycles and cars, more or less equivalent to buses and higher than bicycles.

Abstract: In winter in north of China, vapor in automobile emission will freeze on the wall of emission pipes because of using ethanol gasoline, and outflow onto roads. This is a common phenomenon which not only causes traffic jam and safety problem, but also increase fuel consumption. This paper aims to problems mentioned above to improve emitting system to reduce or eliminate freeze on roads caused by drain water due to combusting ethanol gasoline under the condition of influence original emission system as less as possible. Moreover, technique reference will be provided for practice application through building experiment platform, designing experiment program to analyze experiment results and proofing experiment data to present feasibility of reducing emission freeze.

Abstract: Toyata Prius is the first type of HEV automobile of business quantity produce, after continuous development and improvement, now Prius is the third generation. Controlling strategy is the core technology of saving energy and reducing emission. This article analyzes Prius work principle, through experiments of engine start, vehicle start, full gas pedal acceleration, constant velocity, slide and so on to analyze its operating mode, providing help for control strategy research.

Abstract: In order to study the fatigue reliability of taxis, a test method that correlated typical user road with proving ground reliability road is proposed. According to the result of investigation, after taking the road test on the user road, the load spectrum of taxis on the condition of typical user road is obtained. Then the rain flow counting method is used to obtain the load distribution matrixes through analyzing the two groups of data that are tested above , and with pseudo damage as a quantitative basis for the calculation of taxis fatigue damage that generated from load spectrum, an equivalent relationship is established between the two. The calculation results indicate that the ratio of damage of the typical user road to proving ground reliability road is 1 to 148.8, if regarding 600,000 km as total scrapped mileage of a taxi, 4,000 km reliability test on proving ground can achieve the same damage.

Abstract: Based on the interference characteristics of the active suspension anti-rollover control system and electric power steering system, combining vehicle active suspension anti-rollover control system model, electric power steering system model and the steering model, the automobile system dynamic model was established. The optimal control strategy of LQR(linear quadratic regulator) was designed, and integrated control system of the anti-rollover control system and electric power steering was realized. Under Matlab/Simulink, the simulation was done and the results show that the presented control scheme can improve handiness of electric power steering system, and has a good anti-roll and anti-pitch ability.

Abstract: A half-vehicle model with 4-DOF was built up. In response to a nonlinear, time delay and uncertain system of automobile suspension, an improved self-adaptive fuzzy PID controller of the active suspension was designed. Taking SANTANA2000s suspension parameter for simulation and taking a step function as the input of simulation road, time-domain simulation in Matlab was finished. The simulation result indicates that the ride comfort was improved obviously by using the active suspension with improved self-adaptive fuzzy PID controller. The time of response reach to steady state was shortened notably. The active suspension with improved self-adaptive fuzzy PID controller is superior to the passive suspension and the simple active suspension with fuzzy controller in improving the ride comfort and maneuverability. All of these advantages are of considerable referential values in development of vehicles active suspension controller.

Abstract: As regards the reliability of the vehicle electronic devices on the tracklayer getting worse due to severe vibration, isolation theory and mechanical model of the GWF vibration isolator and wire-mesh vibration isolator were analyzed, and the test research on the isolation effectiveness of the two isolators applied to the isolation of the vehicle electronic devices were carried out. The test results show that the vibration source of the foundation of the electronic device is mainly from the structure resonance, and the two dry friction vibration isolators exhibit excellent isolation effectiveness on different roads and at different speed. The wire-mesh vibration isolator shows better performance than GWF vibration isolator on three-dimensional comprehensive isolation.