Abstract: The design and development of a screw-drive in-pipe robot is presented. The robot is composed of power-driving module, walking orientation module, universal joints, and accessories. The application of automatic spring structure on the robot improves its adaptability. The robot is able to move smoothly in the vertical, inclined, or horizontal pipelines, or even when the cross-section of the pipe is not strictly circular. The calculation formulae of robot walking speed and motor driving torque are derived in this paper. According to the geometries at the bend and the motion constraints, the robot turning capacity and turning condition are also analyzed. The vertical, bend, and other tests are performed on the experimental prototype, demonstrating that the screw-drive in-pipe robot provides sufficient tractive forces and good maneuverability and adaptability.
Abstract: Workpiece placing and removing for stretcher operated by hand have low precision, low efficiency and poor security. The workpiece automatic placing and removing manipulator of stretcher driven by pneumatic is introduced in this paper，in which two control methods: electric-pneumantic control and PLC program control are advanced to realize stepless speed regulation, overload protection and to complete complex actions easily. The design shows the advantages such as simple structure, low cost, easy to operate and maintenance, high efficiency and reliability, which can also improve safety, reduce the labor intensity, ensure product quality and process stability.
Abstract: The paper firstly gives the formation principle of two teeth difference cycloid gear; correctly calculates cycloid gear by using the analysis method when modified cycloid gear is engaged with pin, and a cycloid gear force analysis method of two teeth difference cycloid pin transmission which relatively corresponds to engineering practice is given. The force of two teeth difference cycloid gear compares with the force of one tooth difference cycloid gear with the same speed ratio. By verification of experiment, the calculation results of the analysis method conform to engineering practice.
Abstract: The flow characteristics of control valve are very important to product quality. For measuring the flow coefficient and flow curve accurately and all-rounding, we have designed a test system,which worked with PLC, it can measure the flow characteristics and resistance coefficient of control valve. The main purpose of this study was to bring out the work elements, design feature, and test software.The study we have performed showed that this test system is reasonable, easy to support entire automatic measurement with high precision and easy operation.
Abstract: This paper presents an electromechanical, two axes sun tracking system based on single chip microcomputer (MCU). According to the path of the sun in the space, the earth coordinate system is chosen to design the tracking device. The whole device consists of one worm-drive and one gear-drive, which is operated by two step motors. The photodiodes are used as photoelectric sensors to detect the pointing of the sun. Eight photodiodes are installed in the diameter hole of the hemispherical surface. The comparative signals produced by the diodes array are performed to judge the orientation of the solar panel. The circuit of the control system based on MCU is demonstrated. The comparative signals may be amplified, A/D converted. After a series of signal processing, the signals are sent to the MCU which will produce the pulse to control the speed and steering of step motors. The sun tracking system is an efficient system for solar energy collection. It has been proved that the sun tracking systems can collect up to 50% more energy than what a fixed panel system collects.
Abstract: The paper presents a new method for mode selecting which includes constant torque mode and flux-weakening mode. The proposed method modifies the working modes not by LUT (look-up table), but by the size of T0. Attractive features of this state transition technique include no dependency on the machine parameters, the least calculated quantities, making full use of the source voltage of the battery, and smooth and fast transition into and out of the flux-weakening mode. Simulation results at various operating conditions are presented to verify the feasibility of the proposed mode transition scheme.
Abstract: This paper has a research on a novel integrated printing and drying machine. The machine is used to print the LOGO on the products. Two ways of printing are introduced in this paper and the screen printing is chosen. The drying machine is also introduced and the drying process is simulated by CFD software. The result of the simulation tells us the temperature distribution of the ABS panel surface. Compared with the experimental datas, the simulation result is proved correct. With this simulation model, we can determine rational parameters of drying machine.
Abstract: Aiming at the problems of complex circuit and parameter adjustment in traditional current type power amplifier of Magnetic Bearing (MB), a new realization method of control system based on DSP (Digital Signal Processor) is proposed. The difference with traditional power amplifier is that the current control loop is realized through software in DSP, so some advanced control strategies will be adopted easily, and the control parameters could be modified freely. Besides, the models established in MATLAB using common control strategy and advanced strategy are simulated separately, and the simulation results show the better effect can be obtained with the latter. Finally, the rotor of a 1-DOF MB prototype can be suspended within 0.01mm in the experiment, and the control strategy and parameters can be modified freely by software in DSP.
Abstract: The vibrational control theory stems from the well-known of stabilization of the upper unstable equilibrium position of the inverted pendulum having suspension point vibration along the vertical line with amplitude as small as desired and a frequency reason high. Chaotic phenomena have been found in many nonlinear systems including continuous time and discrete time. The chaotic systems are characterized by their extreme sensitivity to initial conditions, nonperiodic and boundary. The trajectories start even from close initial states will diverge from each other at an exponential rate as time goes. The vibrational control method was applied to Lorenz system. The effect of the control can be estimated with the APAZ method. It was showed that vibrational control brought the controlled Lorenz system to stable equilibrium with appropriate parameters. Numerical simulation demonstrated validity of the proposed method.