Applied Mechanics and Materials Vols. 556-562

Abstract: To broaden the application scope of the controllable overrunning clutch, a novel type Separable-Control Overrunning Clutch (SCOC) used in vehicle system has been designed by the authors of this paper. With the special axial arranged structure, the clutch has bidirectional engaging ability and its both sides could be chosen as the driving end. In order to analysis and compare the bidirectional engaging characteristics of the clutch, a nonlinear dynamics model taking into account clearance and elastic contact has been established by ADAMS. Through the simulations, a series of comprehensive summary on the bidirectional engaging characteristic has been drawn and it could provide theoretical guidance for further prototype design and experimental research. Project supported by National Natural Science Foundation of China (Grant No. : 61074104 )

Abstract: This paper derives the kinematic equations of 2 DOF articulated vehicle based on D-H method. When unilateral wheels of the articulated vehicle surmounting the depth cavity, the path is studied by simulation and experiment. The experiment result shows when the articulated vehicle surmounts the cavity of 0.46m, there is a yaw angle about 5o and the motion direction yaws. By calculating the differential kinematic equations, it is founded that the wheel-ground contact angles in both sides of the front (or rear) wheels change differently, which leads to the rotation around the vertical axis and yaw. Finally, we analyze the experiment and simulation errors.

Abstract: This article mainly on monorail crane motion characteristics of three different kinds of drive systems and pressure analysis of I-steel. The motion characteristics figure of hydraulic step cylinder drive system, friction wheel drive system, rack-and-pinion drive system are done by Solidworks Motion module. The I-steel pressure analysis of different drive systems is done by the Ansys Workbench module. By analyzing and comparing the figures, the rack-and-pinion drive system has a superior property in both motion characteristics and pressure of I-steel.

Abstract: This article introduces the structure of the transmission frame, analyzes the force the frame bear and ensures the loading conditions in the strength analysis of transmission frame. In allusion to the stress situations on transmission frame of coal-mining tubular belt conveyor , this article uses the ANSYS software to analyze the stress and strain of transmission frame in given-working conditions. And the result showes strength and stiffness of transmission frame satisfy the design requirements, providing the theoretical basis for the next design and optimization of transmission frame.

Abstract: In coal production, those supporting anchor generally remain in the rock , at the endof the mine mining .We need to recover the anchors to maximize savings and reducing consumption , and accelerate the working face roof caving in roadway . The paper through the analysis of the disadvantages of traditional anchor back , put forward the application of pre-mixed abrasive water jet technology to the cutting of anchor rod and anchor rope . The experiments show that the technology not only meets the requirements of underground safe production, but has good cutting effect , high efficiency , saving a lot of manpower and time.

Abstract: For servo drives are expected to reliability problems, a comprehensive approach based on Analytical method is adopted. First, the principle of the servo drives are analyzed to study its structure and composition and further function modules. Then the solution of each circuit component parameters, environmental stress and electrical stress conditions than parameters, based on GJB/Z 299C-2006 to establish the reliability of the model, computing unit, system failure rate, and average working life (MTBF according to the characteristics of series and parallel components ). Finally, using Relex servo drive reliability modeling and simulation to verify the results of stress analysis method.

Abstract: Based on the application of the vehicle parameters, the article analyzed the brake process and its performance by MATLAB. The article proposed analytical method and process of automotive brake ideal conditions by simulation software MATLAB. And through drawing the ideal front and rear brake force distribution characteristics, calculated and analyzed the wheel brake force, adhesion coefficient and brake strength. Also the article provided the foundations of convenient calculation method and visual analysis for automotive brake performance.

Abstract: At present, the pure electric vehicles with a permanent magnet synchronous motor (PMSM) vector control (VC) and direct torque control (DTC) are mainly control method. These two kinds of control mode are considered as a high performance PMSM control strategy which has been widely used in practice [5]. Starting from the mathematical model of PMSM, two kinds of control strategies are to be the theoretical analysis, so that the control thoughts and the composition of control system has a profound understanding to applies two kinds of strategies to control of PMSM. Simulink modeling and simulation results proved that vector control is better than that of direct torque.

Abstract: The tool-path generating methods of roughing and finishing provided by MasterCAM were systematically analyzed including their features and applications. Then a blade with freeform surface milled by different tool-paths was simulated. According to the comparison of simulation effects and information, the flow-line tool-path was proposed to be optimal for machining blade with freeform surface. Finally, the blade was finished with optimal tool-path using a 3-axis NC milling machine.

Abstract: Modern motor needs high power density and low rotary inertia,which can improve its dynamic characteristics.Traditional permanent magnet motor shows its limitations.A new structure of ironless rotor motor is proposed. Finite element analysis based on ANSYS proves that the new design not only can increase the motor air gap flux density, but can make the use of ironless rotor rotor become reality. From the relationship curve between air gap flux density and ironless material width, can easily find the ideal width of ironless material of the motor.