Advanced Materials Research Vol. 933

Abstract: In this paper, an 3D model of a special vehicle power cabin is developed. Using FLUENT 6.3 the simulation on different helix hand of dual axial fans and different arrangement of with/without bulkhead are conducted. The influence law of different arrangements on airflow fluid field of power cabin is obtained on the condition of dual axial fans. Simulation results mean important recommendation to the design of power cabin dual axial fans.

Abstract: A play-back controller was designed for a certain series of aircraft. The XC866 MCU was used as the main controller unit, and an 8051 MCU as the assistant control unit. It achieved the function of channel selection, channel switching, signal filtering, signal decoding and tape speed controlling. Compared with other play-back controllers this instrument is more superior in control precision, reliability, use of flexibility and simple of structure.

Abstract: Step motor features small in the volume, big in the torque and wide in the range of speed. Parallel robot possesses the characteristics of large rigidity, strong load bearing capacity and small error. Directed against the parallel robot mechanism with step motor drive, the closed-formed solutions were developed for both inverse and direct kinematics, a model of control system was establish, after that a kind of fuzzy control algorithm was designed, and a simulative experiment was made on the Matlab/Simulink. The result shows that this algorithm achieved high precision real-time control on this parallel robot.

Abstract: Parallel robot possesses the characteristics of large rigidity, strong load bearing capacity and small error. Directed against the new-type parallel robot mechanism with step motor drive, the closed-formed solutions were developed for both inverse and direct kinematics, a track planning in its workspace has been carried out, and a model of control system was establish, after that a kind of sliding mode control algorithm was designed, and a simulative experiment was made on the Matlab/Simulink. It is shown that the parallel robot system using the proposed control algorithm does not have the chattering problem. The system has good robustness, and is robust to the uncertainties and disturbance, and has good performance in tracking, and high precision real-time control on this parallel robot is achieved.

Abstract: Wind power short-term forcasting of BP neural network based on the small-world optimization is proposed. First, the initial data collected from wind farm are revised, and the unreasonable data are found out and revised. Second, the small-world optimization BP neural network model is proposed, and the model is used on the prediction method of wind speed and wind direction, and the prediction method of power. Finally, by simulation analysis, the NMAE and NRMSE of the power method are smaller than those of the wind speed and wind direction method when the wind power data of one hour later are predicted. When the power method are used to forecast the data one hour later, NMAE is 5.39% and NRMSE is 6.98%.

Abstract: The structure parameters of the robot directly affects its workspace, in order to get the relationship between the structure parameters of the robot and the size of workspace, an evaluation standards of the size of workspace is presented based on the mechanism of the center height. This paper proposes an novel 2URS&UPS parallel robot, it has Six degree of freedom. By using the sphere coordinate searching method, through the MTLAB programming calculated the influence of structural parameters on the workspace. Analysis results show that the parallel robot has the maximum workspace, when the static platform radius is 140mm and the moving platform radius is 120 mm, the rod length is 160mm. The study showed the parallel robot has advantage of a large workspace and symmetry. The parallel robot can be used for walking leg, mechanism arm, etc. The paper provide a theoretical basis for design of the parallel robot.

Abstract: The forearm is a typical ball and socket joint which have three degrees of freedom rotation. In this case the study of a 3-DOF manipulators is very interesting. In this paper, a novel manipulators based on 3-DOF orthogonal spherical parallel mechanism is proposed. Error analysis play an important role on the design and applications of the manipulators. The error model is derived in closed forms by using differential theory. Error evaluation index is defined. Terminal platform error distribution is analyzed and discussed in detail by using the error model technique. The analytic results indicate error value is smallest in initial position of the manipulators,the bigger value of error distributes in the workspace edge. So, this paper could provide a theoretical foundation for design and application of the manipulators.

Abstract: This paper focuses on the manual operations on the virtual cabin devices of a flight simulator developed by virtual reality technology. The system consists of the space positioning system, the data glove, the three-dimensional head-mounted display, the left and right eye stereoscopic imaging computers, the space positioning computer, and the main simulation computer. The hand position, attitude, and shape data are measured through the space positioning system and the data glove while the aircraft position and attitude are calculated through the aircraft simulation system. The hand model is represented by the hand position, attitude, rotation angles of fingers, the key points in the hand and the movement directions of these points .The virtual devices are modeled with object-oriented method encapsulating device shapes, operation status, the hand key points and their movement directions that are affective on the device shapes and operation status. The aircraft attitude is overlaid with the hand attitude in order to regard the moving cabin as static. Thus the coordinate transformations are confined to only the hand model and the device models that operation status changed to avoid the large amount of coordinate transformations and reduce the system time consumption. The application result shows that the virtual operation algorithm has a high efficiency, and the operation precision meets the need of system performance.

Abstract: In the paper, with the secondary development of FANUC-0MD system, the flexible control system which meets the requirements of the sawing and milling machining center for PVC door and window profile is realized. Based on researching the structure, the function, the process of the technologies and the control requirements of the machining center, the CNC system has implemented, including the machine tool origin and work piece coordinate origin establishment and auxiliary control system M code development. In this flexible control system, through studying the geometric character, the technical character and the mutual relation between them, various windows shape on the structure and the machining figuration is possessed of. We gain the feature subclasses aggregate of the machining technology of windows shape. Consequently, CAM system is achieved.

Abstract: With the technology market and talent market demand for EDA continues to improve, the market demand for products and technology requirements of the market also will be reflected to the field of teaching and scientific research in the field. EDA technology improves, promoted the development of elevator controller. Elevator industry with the development of science and technology, constantly appeared in various places, people's life so, design of elevator controller is a practical example, also has the very big help to master the applications of EDA technology. The elevator controller is composed of two parts of hardware and software. This design using the EDA technology to carry out the operation, design is a 3 storey elevator controller.