Applied Mechanics and Materials Vols. 365-366

Abstract: Most rollover accidents involve articulated engineering vehicle due to the center of gravity shift when steering. In this paper, a virtual prototype model of a loader as the typical articulated engineering vehicle is built using multi-body dynamics software. The dynamic simulation of steering characteristic under different slop and speed is made and the roll stability is analyzed. The stable working range of the loader obtained from the simulation results can give reference for the drivers selection of vehicle route and safe operation. This paper has a certain meaning for further study of articulated vehicles roll stability.

Abstract: sosceles trapezoid mechanism is widely used as vehicle steering mechanism because of its symmetrical characteristic in positive and negative steering motions. Design equations of the isosceles trapezoid mechanism are set up and solved through iterative method. Steering error is analyzed and reappeared by diagram of curves. The exactitude on the design results is proved by design example.

Abstract: Aerodynamic brake is a new type of non-adhesion brake mode used to high-speed train brake by unfolding the brake panel on the roof of the high speed train to increase aerodynamic resistance. This brake mode is effective especially in the condition of high speed. The article is aimed at designing a set of opening and closing mechanism to control the movement of the brake panel. The opening and closing mechanism mainly include three components of guide mechanism, the center of rotation and drive mechanism. The guide mechanism as auxiliary orientation is a functional unit of the bearing parts used to improve the movement and load conditions of the brake panel. The center of rotation is the key component to support the brake panel and transmit the braking force. The drive mechanism, the power source of the opening and closing mechanism, is designed to drive the brake panel up and down in the reciprocating motion. This paper focuses on the design of the three components, using the method of combining structural design and reliability design and aiming at the final optimal design.

Abstract: The nonlinear and hysteresis characteristics showed by magneto-rheological (MR) mount make it seem very difficult to establish a precise mathematical model. Based on the testing of MR mount dynamics, RBF neural network model can train and forecast the collected data. Analysis of comparing the predicting result of the RBF neural network model with the testing result shows that the trained RBF neural network model can exactly predict the dynamics of MR mount, and it provides some new ideas to implement the better intelligent control of the engine MR mount.

Abstract: The purpose of this paper is to improve the fuel economy of a parallel hydraulic hybrid heavy bus. And an optimal distribution strategy of the propulsion torque was proposed based on engine working points of the conventional bus. The universal characteristics map of the engine was divided into three zones by the optimal operating line and the fuel contour CBF. The results indicated this strategy can not only overcome the low energy density disadvantage of the accumulator but also prohibit frequent switching between the engine and the pump/motor. The HHP can provide most of the required torque and make most working points of the engine around or on the optimal operating line. When the value of the fuel contour CBF is 213g/kw.h, the bus has the minimal fuel consumption in the typical urban bus cycle and the fuel economy of the engine improves 24.8% compared to the conventional bus.

Abstract: The most of very large traffic system by growing the variety of services, the relationships between the vehicle network and the infrastructure are more complex. Moreover, intelligent transportation systems are getting more and more to develop a better combination of travel safety and efficiency since long time ago. Vehicle is being evolved and traffic environment is especially also organized well-defined schedules priorities, which is real time based wireless network traffic condition, variable traffic condition, and traffic pattern from the vehicle navigation system. Accordingly, we propose to Knowledge-oriented Smart Vehicle Adaptive Traffic Service using genetic algorithm in this paper.

Abstract: In order to predict the development direction of stereo garage car carrier to accommodate the present need of transportation, combined technology system of car carrier with evolution routes belongs to evolution patterns in theory of technology evolution. Relationships between total system and evolution routes, relationships between subsystem and evolution routes were built, on the basis of researching the structural feature of stereo garage car carrier, analyzed the evolution rules of total system andsubsystems along different evolutional routes, indicated its present evolutionary state and predicted the future development direction. It is helpful for enterprise to accurately predict the next generation of product and greatly improve market competitiveness.

Abstract: foreign matter invasion is a disastrous hazard regarding the safety and stability of high speed railway. Considering the fact that foreign matter invasion forecast is not matured yet,development of foreign matter invasion warning system is a very important countermeasure for foreign matter invasion disaster mitigation. Basic principles of the foreign matter invasion warning system and its application to railways are presented. The state-of-the-art of the foreign matter invasion warning systems for high speed railways around the world is introduced. Main points in development of the foreign matter invasion warning system for high speed railways are discussed, including layout of monitoring stations and monitoring means selection, with particular attention paid to railway safety operations. The present review is expected to be of significance to the development of the early warning system for high-speed railways in China.

Abstract: In order to reduce the aerodynamic drag of heavy-duty truck, four different shape and style of deflectors based on the original one are added. With the method of numerical simulation, the influence of deflector on the flow field of the cab and the vehicle was analyzed, and the mechanism of aerodynamic drag and the measures of drag reduction were discussed in the study. When driving at speed of 30m/s, the aerodynamic drag will be significantly reduced with the contributions of all the four deflectors. The optimal solution can reach a reduction about 14%.

Abstract: Suitable methodologies for the dynamic analysis of chain drive mechanisms, based on a multibody systems formulation in which clearance revolute joint formulation is extensively used, have been developed and implemented in a simulation code. The use of tightener systems has been recognized as the most effective way to improve the performance of chain drive mechanisms, since the occurrence of instabilities and vibration patterns of the free chain strands between sprockets can be largely reduced. As a result, these components have been extensively used in car and marine engines. Their influence on the dynamics of the system is analyzed in this article.