Applied Mechanics and Materials Vols. 101-102

Abstract: In order to meet the demand of social development, improve the speed and comfort during elevator running process, the elevator speed control system is studied in this article. One new elevator speed control method is put forward. The implementing process of the new method and the design of elevator speed curve are elaborated in detail. The new control method has good utility in improving the running efficiency and the riding comfort for the elevator.

Abstract: The flight Performance of missile can be improved by adaptive morphing wing serving as main lift surface. A novel compounded morphing missile, a complicated nonlinear and non-analytical multivariable constrained optimization problem, is modeled to design adaptive program of the wing geometry versus flight states. Based on reformed optimal algorithms such as Monte Carlo and Particle Swarm Optimization (PSO), a set of integrated approach is developed to optimize the shape change program of wings by interactively reading and writing data files from missile DATCOM. The simulation results show that the proposed algorithms can be used to obtain an optimal missile configuration over large flight envelope, characterized by maximal lift-to-drag ratio and a required normal overload.

Abstract: In order to improve the operation efficiency of order picking trucks in the warehouse, the mathematical model of the routing optimization problem is established. Then PSO (Particle Swarm Optimization) and ACO (Ant Colony Optimization) are used to solve the model. Experimental results show that both of them have good overall search ability and astringency. The operation efficiency is improved to a great extent by using swarm intelligent algorithms.

Abstract: More and more high-level order-picking trucks are used to pick and transport goods in warehouses. The dynamic stability of the truck has great effect on operation efficiency, quality and safety. It is instructive and meaningful for the optimization of structure and control strategy to analyze the dynamic stability of the truck. Firstly, the dynamic model of the order-picking truck is established using Alembert principle, and then the dynamic stability of the truck is analyzed. Secondly, the virtual prototype model of the truck is established and traveling process is simulated. The simulation further verifies the dynamic stability of the truck.

Abstract: When a robot is used to polish or finish a curved surface, both feed movement and contact force have to be controlled at the same time so that the polishing tool would machine its work-piece at the right position in right posture with required force. In this paper, a passive wrist system is developed to adapt the shape of the machining curved surface by changing its posture along with the surface. And under the Fuzzy-PID policy, polishing force is controlled at a stable value in the normal direction of the named machining point while the polishing tool moving along the curved surface by multi-point machining. It means that the passive wrist system and the model of the surroundings could be used in force controlling when robots polish free-form surfaces with multi-point machining by a grinding ring.

Abstract: Based on two kinds of upper mould bases real structures of high speed punch, the structure was simplified and simulation models were built in next step. According to working condition of actual temperature changes and moving characteristics for the high speed punch, the thermal boundary conditions, the thermal- stress coupling conditions and mechanical constraint conditions of the simulation model were set up, and the deformation for the guiding hole of upper mould base were got through simulation analysis. Through the comparison of the two simulation results, it illustrated that the improved upper mould base is more suitable for high speed punch with high punch frequency condition.

Abstract: For the disadvantages of the poor open and high price of the special joint robot control system, a general PC-based three degree articulated robot control system is proposed. After modeling kinematics of the robot, the kinematics trajectory is planned and the trajectory algorithm is designed in a given error condition. Finally, the control program is done with VB, and it is verified by an example.

Abstract: The ability to solve inventive problems is the core of the innovation process. TRIZ have shown results that inventiveness can be understood and developed systematically. Considering the deviation accident of belt conveyor is frequently taken place, so this paper presents a strategy based on TRIZ principles to inventive design of tensioning device for enhancing deviation problem solving for belt conveyor. The useful and potential solutions are induced by using TRIZ principles. The results show that TRIZ is a useful tool which helps in solving problems by eliminating contradictions.

Abstract: The variable speed hydraulic systems have many advantages, and research about this field in recent years has developed rapidly. In this paper, a variable speed hydraulic system is studied using BP Neural Network PID controller. The research results show that using BP Neural Network PID controller can achieve good control effect.

Abstract: This paper proposes a new method to optimize cold strip rolling schedule by means of self-adaptive learning based particle swarm optimization (SLPSO). Multiple strategies may be adopted based on their previous behaviors in the searching. This particle swarm optimization version is robust and effective in solving complex problems. Function of power cost was constructed to heuristically direct the SLPSO searching, based on the consideration of power distribution, speed and rolling constraints. The results of simulation demonstrate that SLPSO is more efficient in calculating than others, and provides a new valid method for the intelligent optimum design of scheduling tandem cold strip mill.