Applied Mechanics and Materials Vols. 644-650

Abstract: The antiriot shield is a type of individual protective equipment that was widely used in the process of dealing with the large-scale antiriots and unrests by the Armed Police Force. It has so many features that convenient for carrying and could effectively protect security for our majority officers and soldiers. However, the traditional riot shield has problem of smaller protection area. The paper is just aimed at solving this problem by using the three-dimensional mechanical designing software SolidWorks, having designed a new kind of automatically expanded riot shield which can be employed during in an emergency situation; the changes of this riot shield’s protection area could be realized by operators for controlling the automatically extended devices which were designed on the shield, this will effectively address the shortcomings that smaller protection area of the present shield, and it will provide a strong security for the majority of the Armed Police officers and soldiers in dealing with the large-scale mass incidents.

Abstract: Many researchers applied creepage to calculating creep force, but relation between creepage and creep force are very complex and it has been a major problem for solving rolling contact theory. The paper uses the finite element method for studying directly creep forces and apply it to the studies of wheel-rail rolling contact. Paper establishes the finite element model of wheel-rail rolling contact based on ALE method in ABAQUS, and simulated unsteady state of wheel-rail rolling contact and research normal force of wheel-rail contact pitch. Results show that the normal maximum pressure in left wheel have a trend toward the center of contact pitch and the normal maximum pressure in right wheel have a trend toward the other center of contact pitch with increasement of displacement

Abstract: This paper describes the main properties of the soil, in the analysis of the soil under the horizontal load stress distribution and stress - deformation relationship on the basis of research issues related to wheeled vehicles and tracked vehicles traction. The formula gives the vehicle traction, analyzes the factors that affect vehicle traction and proposes an effective method to improve vehicle traction.

Abstract: Cooling system is an important component of hot stamping dies, directly affects the quality and performance of the product. This article studies the work of hot stamping die process variation in temperature and heat transfer methods, analyzes the main factors affecting the cooling effect, and the use of numerical simulation of the flow of cooling water to simulate the state, and proposed rationalization proposals.

Abstract: The flat wall be used in the design of pressure tank, the flat wall is the weakest part in the tank, therefore, the most important is how to improve its stiffness and strength. The surface is sprayed that uneven superhard films is used to improve the stiffness and the strength base on membrane analogy theory in elastic mechanics. The method is simple, convenient and practical. The simulation results prove that the method is ideal using Analysis.CLC:TH140 Document identification:A

Abstract: In control system of vehicle chassis, two integrated control sub-systems of chassis have achieved some better results than a single sub-system control. However the two integrated sub-system control can not improve some dynamic performance on vehicle when other sub-system of chassis is disturbed. In order to improve vehicle dynamic performance of some sub-system, an integrated control method based on multi-system with suspension, steering system and brake system is designed. In the model, a 14-DOF vehicle model is used, and an integrated control method based on multi-system of chassis is designed in software of Matlab/Simulink with an integrated controller of PID. Simulation results show that the overall vehicle performance based on the three integrated control systems of chassis is better than those of two integrated control system.

Abstract: In order to improve overall vehicle performance and decrease movement deviation caused by uncertainties from automobile chassis, a robust vehicle chassis model is built with steering system, suspension system and braking system. In the model, the length of the steering trapezoid arm, the bottom angle of trapezoid mechanism, inclination angle, caster, camber and toe-in are defined as controllable variables, and load, driving force, steering torque are defined as noise factors. The optimum objectives include the maximum turning angle error of steering mechanism, the maximum braking sideslip and the maximum swing angle of front wheel on bumpy road. Taguchi method is applied to solve the robust result for automobile chassis model. Compared that the variances of objective values are decreased with the same noise factors and the robustness of sub-systems of chassis is improved.

Abstract: Existing AGV car’s brakes are electromagnet brakes. Brake overheating causes brake damaged during work time.In this paper ,the hydraulic pressure floating caliper brake is applied to the AGV car . It with electromagnetic brake AGV car for braking performance comparison test, through comparative analysis know that hydraulic floating caliper brakes can not only meet the AGV car’s braking requirements and the system dynamic performance has improved greatly.

Abstract: With the current domestic and international research and development technology, a new intelligent low-voltage switchgear control system is realized by ARM-based, with highly integrated, low-cost hardware and software design.The paper introduced the overall process of hardware design and software design. The system has been proved that the ability to realize the low-voltage distribution system monitoring and management, with open and close, open circuit detection, temperature and humidity measurement and control functions and intelligent, digital, low power consumption, and interference characteristics.