Applied Mechanics and Materials Vols. 644-650

Abstract: The internal-curve planet gear pump is a new type of gear pump, which is on the basis of the transmission theory of non-circular planetary train and the working principle of gear pump. In order to realize the function of hydraulic pump, it is very important to research on the port plate of the pump, and it is a key link in the process of research on the pump for the mechanical efficiency, volumetric efficiency and stability of low speed. After analysis of structure principle, movement track of planet gears and variation of oil distribution hole, the discussions focus on the position of the oil distribution holes of the port plate, as well as the number, the size of the oil distribution holes. The study indicates that the port plate designed can satisfy the internal-curve planet gear pump.

Abstract: As injector injects coiled tubing into well to a certain depth, the coiled tubing is unable to be injected continuously because of the increasing friction between the coiled tubing and the wellbore. With the core technology being an effective role in the Coanda Effect control switch, the Water Hammer Vibrator may extend the depth of the coiled tubing into the wellbore. Firstly, the paper verifies the effectiveness of the Coanda Effect control switch in Water Hammer Vibrator. Secondly, it optimizes the structure of the Coanda Effect control switch and improves the driving force of the piston of the water hammer vibrator without changing the injection flow rate, pressure and the other boundary conditions. Finally, it obtains varying patterns of the hydraulic cylinder pressure at both ends in the process of the Coanda feedback and trigger action by the experiment of the Coanda Effect control switch to measure pressure at both ends of hydraulic cylinder with the NI data acquisition unit. The results confirm the validity of the optimized Coanda Effect control switch in water hammer vibrator, so as to ensure the implementation and improvement in the water hammer effect of Water Hammer Vibrator.

Abstract: In view of the current low lifting speed of the hydraulic lifting column, simple control function and other unfavorable factors, a effective theory is proposed. Such theory combining with exciting lifting technology employs the advanced PLC core chip with reliable characteristics to establish a control system. The control manners include wire mode and wireless mode. After experiment verification, the proposed control system can realize lifting function of the hydraulic column with various control mode. The proposed control system can be applied to traffic routes for safety. The purpose is to improve the traffic intelligentialize, avoid traffic accidents, and guarantee the route smooth.

Abstract: When bearing rotates, it comes with elastic hydrodynamic lubrication effect. Interaction between the effect and the bearing vibration leads to the change of lubricant film thickness, thus, contact stiffness of contact pair changes along with the rotation speed of the bearing, and then the resonance frequencies of the bearing system changes according to the rotation speed. In addition, the impact signal of varying speed bearing damage point no longer has the periodic characteristics. Based on the analysis of the bearing failure mechanism, this paper proposed a varying speed bearing vibration signal fault model, and also utilizes wavelet packet to extract the bearing fault signal by means of a variable speed rolling bearing vibration experiment table.

Abstract: A robot based on STC12C5A60S2 single-chip-microcomputer is designed for improving the production efficiency and reducing repetitive work. The system could identify path by detecting metal using eddy current sensor. By ways of the single-chip-microcomputer controlling stepper motor, the robot can run according to the predetermined route, judge independently cargo range and deliver the goods to the designated location. The implementation methods of the important links, such as mechanical structure design, path recognition and steering engine driving and so on are introduced, the system of which make the information interaction with computer through ISP-module (In-system-programming).by testing the model, it shows that the system can meet the design goals of handling goods automatically, and it has higher application value of reducing the accident rate of worker in repeated works and improving labor productivity.

Abstract: The system simulates completely the water polo-game of entity bionic robot-fish, designed and developed based on Microsoft Robotics Studio SDK(MSRS) 1.5, which includes seven modules, such as client strategy, server core control, common interface, environment setting, simulation data display, assistant function, fish robot kinematics modeling and so on. The simulation system simulates the motion of bionic robot fish and the entire process of water-polo-game in real time, and provides simulation testing platform for bionic-robot-fish model optimization, machine fish movement algorithm, and robot fish water-polo-game.

Abstract: Vacuum annealing is an important part in rare metal tube production, accurate control of the annea ling temperature has enormous influence on the quality of tubes.According to the technological characteristics and temperature control requirements of the vacuum annealing furnace ,a high precision temperature control system was built based on IPC, intelligent temperature controller and thyratron transistor power-regulator.The neural network-PID strategy was proposed to control temperature online through OPC interface, which realized accurate control and automatic detection of the whole process of annealing temperature. Field data indicates that this system has realized the accurate control of the vacuum annealing temperature, effectively improves the quality of rare metal tubes and has extensive application value.

Abstract: An embedded control system development methodology based on model-driven development method was emerged, the basic features and architecture of the embedded control system of specific areas were analyzed and summarized, and the key elements of this specific domain were identified and extracted. Afterwards, a visible element modeling technique was used to build a directly graphical model system, and this kind of embedded modeling technique based on model-driven was applied to realize a model of embedded Robot control system design. As a result, the Robot source model of this system was obtained.

Abstract: This paper studies the smoothly blending problem of two elliptic cylinders whose axes are non-coplanar at sections where they are perpendicular to axes. Based on conditions of smoothly blending axes, we acquire necessary and sufficient conditions of existing blending surface by constructed elliptic cylindrical helicoid tube. And when we meet those conditions, the specific blending examples will be provided.

Abstract: large-scale temperature stability control method is studied in this paper. In the process of large-scale temperature control, the stability of control is a very important indicator. To this end, this paper proposes a large-scale temperature stability control algorithm based on hierarchical control method. Balance equation of large-scale temperature stability control is created for the effective transmission of control data. According to the constant control theory, large-scale temperature stability control system design is achieved. Experimental results show that the proposed algorithm for large-scale temperature stability control system design, can greatly improve the stability of control, and get the satisfactory results.