Applied Mechanics and Materials Vols. 121-126

Abstract: The formulas of design parameters for spatial helix gearing mechanism are deduced based on the equation of spatial curve meshing, including teeth number, helix angle and screw pitch of driving tines, diameter of tines, corrected length of tines, height of teeth etc.. That could supply theoretical basis for industrial application of the spatial helix gearing mechanism

Abstract: We have independent developed ZY6400/25/53 two-leg high cutting hydraulic shield supports firstly, which width was 1.5 m could adapt to much complicated geological conditions, reduced the hydraulic support and accessories costs, and solved the problems of supports’ stability efficiently. Industrial tests showed that the supports application were successful and effective. We realize the high efficient production, the average yield reach to the level of 10000 t/d, if mine system have working conditions, the coalface have the ability produce 5Mt coal annually. This hydraulic support greatly improve the coal resources mining rate, broaden the application range of the high cutting fully mechanized mining technology in China, and led the upgrade of mechanized equipment.

Abstract: An engine control unit mixing fuel-hydrogen based on microcontroller is proposed, including the system power modular, the sensor signal processing modular, the circuit of controller module, the actuator driving circuit module and the corresponding software system. The design and the control process of each module are introduced. The test results in the bench and roads demonstrate that the system can improve the fuel economy and deduce the emission significantly.

Abstract: In order to control the deformation deviation of automobile panels welding assembly, the author analyzed the assembly process of spot welding, and used a simplified finite element analysis method. In this method, work-pieces’ deviations are reflected by equivalent stress, and welding deformations are simulated by the coupling nodes. The author called C++ application in ANSYS FEA software, using stress data files as the interface, and therefore solved the problem of applying initial stress to automobile panels.

Abstract: A novel kind of flywheel energy storage system structure for vehicle is put forward and studied. Flywheel rotor dimension optimization is achieved adopting genetic algorithm on MATLAB program, optimized dimension is helpful for the realization of high energy storage efficiency. Based on certain uniform ring simplification of flywheel rotor shape and applying elastic mechanics solution, theoretical calculation of radial displacement and stress is accomplished. Solved radial displacement, radial stress and hoop stress can be applied in practice for further precise design in the view of mechanical strength.

Abstract: Slip-sinkage is one of the main factors influencing the driving safety of planetary rover in soft terrain. In the environment of scarce features, based on the stereo visual sensors, the visual odometry algorithm is firstly developed to calculate the position changes of planetary rover with six degrees of freedom, which combine with the wheel speed sensor achieve the estimation of wheel slip ratios. Then, on the basis of mechanical analysis of soft terrain, choosing the slip ratio as the state variable, the coordinated driving control algorithm is designed. Simulation and experiment results demonstrate the effectiveness of the proposed control algorithm.

Abstract: To increase quality of the final product, high-precision rolling mills have been used in the modern steel making industry. Hydraulic bending system is widely used to improve the precise of the rolled plate products. In this paper, the dynamics model of hydraulic bending system for asymmetric load is built, and the simulation method is proposed accordingly. The simulation is realized in MATLAB/Simulink. Then an illustrative example is given for demonstrative of the model. Also, the effects of the design parameters are analyzed and some nonlinear factors, such as, flow characteristic, load damping of servo valves, are considered in this simulation. It’s believed that this research will help to analysis and optimize the design of roll bending system

Abstract: Combined the theory research with the actual force and deformation of the guideway joint, the isoparametric eight-node contact element is proposed, the element reflects the joint characteristics of guideway of engraving machine. A finite element model of guidway joint is build. The fundamental parameters of the contact element are deduced by finite element method, which can apply with the performance prediction of the whole engraving machine in the process of design.

Abstract: The problem of dynamic response of multiple circular cavities near multiple semi-cylindrical alluvial valleys under incident plane SH-waves is investigated by the methods of complex function and multi-polar coordinates in this paper. Firstly, the solution domain is divided into two parts, Domain I is multiple semi-cylindrical alluvial valleys, and Domain Ⅱ is an elastic half space with several subsurface circular cavities near multiple semi-cylindrical alluvial valleys. A series of infinite algebraic equations is then obtained based on the displacement and stress continuity condition on “common boundary” of two parts after constructing the associated displacement and stresses expressions of each part. Finally some numerical expamples are prensented and dynamic response of subsurface circular cavities near semi-cylindrical alluvial valleys with respect to different parameters is discussed.

Abstract: The grand bridge of Fu Feng is prestressed concrete cross-section continuous girder, which is reinforced with external prestressing. Construction monitoring is based on the measured data, and using the finite element method to calculate, it need to analyze the control of the stress and deflection in the construction to ensure to make the construction could be completed on schedule and to reach an ideal type. The field monitoring result indicates that the type of bridge did improve and reach the requirement of design after reinforcement.