Applied Mechanics and Materials Vol. 742

Abstract: This paper concentrates on modeling of the electro-hydraulic actuator of dual clutch transmission. A dynamic model of the electro-hydraulic actuator based on mathematical description has been developed by using Matlab/Simulink as the simulation platform. The simulated results are consistent with the experimental results, which show the correctness of the model. This model can be used to study dynamic characteristics of the hydraulic actuator of wet dual clutch transmission and to validate control algorithm.

Abstract: To research the hybrid powertrain vehicle, a forward-facing model is built in this paper. Based on the modeling method of experimental data, the model of throttle percentage and the torque of the engine is built, and the relation model of fuel consumption and emissions is given. Considering the Integrated Starter Generator (ISG) and its controller, the relation model of voltage, temperature, torque and current is established. According to the vector superposition principle of the engine and ISG torque, the model of dynamic coupling is also built. Considering the various external force along the driving direction of the vehicle, the running equation is given. Aim to a single-shaft parallel hybrid vehicle, the simulation of whole vehicle and the semi-physical simulation of ISG drive system are presented in this paper. Results show that the simulations are rational, and the fuel economy of the vehicle is enhanced efficiently.

Abstract: A new method for analyzing lower limb kinetics during sit to stand process is presented, and a trajectory control method (TCM) and an impedance control method (ICM) for a rehabilitation robot are developed. During the sit to stand process (SSP), body segment rotational angles, movement trajectories, ground reaction forces (GRF), center of pressure (COP) and rope tensile forces are measured by the robot sensor system, and the joint moments of ankle, knee and hip are calculated in real-time control program. Test experiments were performed on six volunteers. The experimental results validate the theory that the control methods can assure the accomplishment of the sit to stand process in comfortable postures, and improve the condition of joint moments. The control methods are suitable for self-supported home training, and can be applied to assess kinetics parameters during the sit to stand process and improve the rehabilitation of patients.

Abstract: With the rapid development of computer technology, it is widely used in the control field, including advanced alarm plane,cruise missile,radar,O-E theodolite,etc. The increasing complex and real-time arithmetic was applied in the ATP(Acquire Tracking Pointing) system of the control system for boosting the track、captring and pointing precision of O-E(photo-electric) theodolite, so it demanded the servo controller must complete more and more operations in shorter time. While the actual O-E theodolite accomplished the capture and tracking etc. based on PC104 system, so designed the servo control system based on embedded chip as CPU from the practicality, not only decreases the cubage of the system, but also increases the reliability and precision.

Abstract: This paper studies the joint type palletizing robot arm, using MFC application platform designed a four-axis palletizing robot arm control software. Software in the paper we design has friendly interface, the operator through the input palletizing basic information, and then introduced with the steering gear control and DSP implementation of serial communication programming, and system hardware circuit was designed by palletizing robot arm control system simulation tests were conducted to verify system functions.

Abstract: To get better starting performance for GDI engine forward rotation direct-starting without starter, the optimized choices of fuel injection and ignition control parameters under different initial start conditions was carried out in a wall-guided GDI engine. The results showed that the ignition timing and injection timing have been less affected by the initial start conditions. When the ignition timing is kept near its compression TDC and the injection timing is kept within the scope of 2-10 °CA after the crankshaft rotation, the engine all can get higher rotation speed under different initial start conditions. When the fuel pressures and cooling water temperature are lower, the richer mixture was needed for obtaining higher rotation speed.

Abstract: Synchronization of a class of time-delay chaotic systems with parameters perturbation is discussed in this paper. The knowledge of the delay time is unknown. Firstly, we design a newresponse chaotic system , then based on Lyapunov-Krasovskii function, we show that the responsechaotic system can synchronize the driven system. The proposed method is tested and verified byan numerical example.

Abstract: For free-floating space manipulator, a double loop control law is applied to the manipulator to achieve the force/position tracking of the end-effector, and the influence to the manipulator system is analyzed in this paper. First, the dynamic model is established based on Lagrange's equations. On this basis, a double loop control law which is based on the idea of impedance control is applied to the manipulator. During the force/position tracking, the influence of each part of free-floating space manipulator is analyzed, especially the base attitude disturbance. Finally, a simulation is given to show the analyze results.

Abstract: In order to improve the response effectiveness, extend the workspace of parallel manipulator and make it more conveniently to be used in realistic tasks, this paper has introduced an improved mechanism based on the traditional 6-PUS, which applied the rails leaning outside and the linear motor as its driving system. This has optimized the initial parameters of the improved mechanism, and analyzed its workspace in the software Matlab using the method of cylindrical coordinate search. The result has a guiding significance in optimization of traditional parallel manipulators and the manufacturing of the new prototype.

Abstract: This paper focuses on the robot trajectory planning algorithm in-depth study, we propose a new path planning algorithm to ensure that the velocity and the acceleration of the starting point and the destination point are zero at the same time, and there are continuity of the intermediate points also.Give the matlab simulation waveform diagram and the algorithm at last,and this trajectory planning provides a good reference value for robot trajectory studies of future.