Advanced Materials Research Vols. 1006-1007

Abstract: The interference between cables and surface of acutator limits the movement in the cable-driven parallel mechanism. The mechanism with fixed hinge can’t absolutely avoid the interference point of the track when using linear programming method. One new method, named as distant interference, was proposed to pick out all the interferential points of the track. Based on the principle of symmetrical force, the alteration to position of the six fixed hinges and two extensive hinges eliminated the interference. Through the simulation of combined spiral movement, the workspace of the flexible cable-driven parallel mechanism is larger than that of the mechanism with fixed hinge and reduce the interferece of long and big track. Compared with the original mechanism, the value of cables force in the flexible cable-driven parallel mechanism is smooth, continous and no sudden change.

Abstract: In order to improve vehicles comfort, electronically controlled air suspension is taken as study object. We designed the PID controller, which can regulates stiffness and height of air spring. Taking stiffness of air suspension as control variables, and the acceleration of the sprungmass as target values, one-quarter vehicle model of air suspension for bench test is established, then PID control system was tested on the bench.The bench test results show that the PID control algorithm can improve vehicle ride performance.

Abstract: This article studied the blade structure on the influence of particle movement, as well as the force between blade and particles. Cone mixer is one of the commonly used equipment for powder mixed, usually, its blade’s movement driven by motor to stir particles, the structure of the blade to powder mixture has important effect, thus it’s important significance to explore the structure of the blade. The result based on the discrete element method to calculate the particle motion and stress with different blade structure, provides important help and reference for the design of the mixer blade.

Abstract: Analysis was carried out to the kinematics between piston and cylinder block in the axial piston motor. And the formula of displacement, velocity and acceleration of the movement of piston in the cylinder block were given, and some suggestions were also presented to help the design of the axial piston motor with high speed and high pressure in the further.

Abstract: Modeling and finite element analysis functions were combined in Solid Edge to optimize gear parameters. Gear parameters optimization objective and procedure in different conditions were summed up. A complete Excel file was created. An involute gear parametric model was established which was interlinking with the Excel file. And the model’s accuracy would not alter with the diameter’s change. The wizard software for gear drive design and parameter optimization was developed on platform of Solid Edge by Visual Basic tool. This application can guide users getting the initial parameters and optimizing the parameters by the circling method of diminishing parameters, analyzing the precise gear root stress with Femap Express module, and diminishing them again. Users can get a gear model which has a smaller diameter and smaller module and satisfies strength demands.

Abstract: This paper reveals the popular error and problem in optimization design of helical springs. Most of the engineers and researchers regard wire diameter d, mean coil diameter D and number of active coils n as design variables in the mathematical model of optimization design for helical springs. In fact, only two variables are independent variables in the three design variables. The dependent variable in the optimization design model influences the behavior of the systems to be optimized, which is also possible to calculate wrong results. This paper analyses relationship of wire diameter d, mean coil diameter D and number of active coils n. To take number of active coils n as the dependent variable is reasonable. It can lead to wrong results to take n as the independent variable. The right independent variables in optimization design of helical spring are wire diameter d and mean coil diameter D.

Abstract: Cable pendulum bars need to withstand not only the gravity of ripe plug and cable but also the impact load of the shedding of ripe plug. In this paper, the cable pendulum bar was modeled and analyzed using finite element analysis by UG NX4, and stiffness strength check was carried out on cable pendulum bar. On this basis, the impact load were calculated and analyzed. The shearing stress of forced off cylinder’s block, strength of steel wire rope and the force of cable pendulum bar’s locking mechanism were checked with the shock loads, and the basic theory to design and development cable pendulum bar were provided.

Abstract: MOTION module of UG NX 8.0 is embedded with powerful ADAMS solver which can integrate modeling, simulation and analysis together, and the mutual transformation of various softwares is no longer required. This paper models the truss structure of a shaper mechanism in UG, and conducts kinematics simulated analysis. And the result is consistent with the result of the classical theoretical calculation, which verifies the reliability of UG NX8.0 MOTION module in the rigid body kinematics analysis. This paper proposes that convenient and rapid information software of advanced manufacturing industry, instead of the traditional complex theoretical calculation method, should be promoted and applied to solve the practical problems of engineering design.

Abstract: According to the confusion effect of processing route drawing, few sampling points and contradiction between timing accuracy and system fluency of Windows system in high-speed CNC real-time plotting process, this paper presents a method based on Windows environment to achieve real-time plotting goal of the machining contour in high-speed CNC laser cutting process by pretreating G codes and interpolation algorithm improvement. Experimental research was implemented and this method has already been successfully applied to practical production. Comparing to traditional real-time plotting method, this method can not only achieve faster real-time plotting, but also ensure accurate graphic drawing quality and meet the demand of practical circumstances. This method, put forward by the author in addressing real-time plotting problem of laser cutting, can be equally applied to other two-dimensional high-speed cutting occasions.

Abstract: Sweep is useful in CAD modeling process. But its precision is hard to control when we use discrete modeling method. In this paper, the sweep surface is constructed by projected-based approach. Vector and distance methods are proposed to detect the local self-intersection of sweep surface. Beside these, it gives the precision control methods in the corner of sweep surface to improve the precision. Finally, we discuss the factors that influence the precision of sweep surface.