Applied Mechanics and Materials Vols. 325-326

Abstract: This article aim at coking mechanical running time is optimization Researched based on the genetic algorithm, first presented running time model of the S type accelerate and deceleration curve and corresponding running constraint condition, and then established time optimal model of the genetic algorithm and simulation function of the running time use genetic algorithm to optimize, and finally through the operation simulation function, the optimal results is given.

Abstract: This paper attempts to give a detailed model and contact emulation analysis of gear models based on the ANSYS software, the method of which is superior to stree analysis figuring out the causes of mechanical failure. stress nephogram of the emulation analysis indicates the fracture of gear base is mainly caused by inclined press load which results in stress concentrate. This paper offers very valuable reference to product optimization and gear improvement.

Abstract: Building 3D model for a new type direct-drive NC Turret tool post, and introduce the model into ADAMS for further kinematics and dynamics simulation. In the kinematics simulation, observing the motion process of the direct-drive NC turret tool post and plots the trajectory of moving parts to a curve. Simulate the force condition of the NC turret tool post in actual situation, calculate the axial load and verify the clamping force in dynamics simulation.

Abstract: This work addresses the dispersion of Love wave in an isotropic homogeneous elastic half-space covered with a functionally graded layer. First, the general dispersion equations are given. Then, the approximation analytical solutions of displacement, stress and the general dispersion relations of Love wave in both media are derived by the WKBJ approximation method. The solutions are checked against numerical calculations taking an example of functionally graded layer with exponentially varying shear modulus and density along the thickness direction. The dispersion curves obtained show that a cut-off frequency arises in the lowest order vibration model.

Abstract: An analytical model to predict nonlinear dynamical responses of a linear rolling bearing due to ball passage vibrations has been developed. The implicit type numerical integration technique Runge-Kutta iterative method is used to solve the nonlinear differential equations. In order to verify the proposed model, experiments are carried out and good agreement between the theoretical result and that of measurement is achieved. It is helpful to use this model to design a satisfactory linear rolling bearing with comprehensively pleasant ball passage vibrations.

Abstract: The present work exhibits a further development of a mean for furthering conventional drag-driven VAWT technology by contrasting the counter-rotating (parasitic) torque generated from drag-driven vertical-axis wind turbine (VAWT) blades travelling into the wind through the use of a variable rotor blade geometry. A former research on water tank experimental tests on a small rotor characterized by three horizontal blades having variable geometry has been presented [. Each blade was obtained by connecting a horizontal flat plate to a tilting one swinging over a horizontal axis, so that the tilt angle between the two plates could vary depending on flow field conditions. In this paper several open-field measurements at different free-stream wind velocities have been carried out, in order to characterize the energy performance of the rotor for two different blade profile architectures: first experimental investigations were performed on a fixed-angle blade configuration of 41.3 degs between the horizontal and the inclined flat plates. Then, attention mainly focused on tilting blades, achieving a quantification of the influence of blade swinging on overall rotor performance. A full campaign of analysis was completed for both blade configurations and overall rotor torque and power were analyzed as a function of incoming wind velocity and rotor angular speed, resulting the variable-blade configuration maximum power coefficients much higher with respect to the corresponding classical drag-type fixed-blade architecture.

Abstract: Strain loading control is important for addressing the complex requirements of tissue engineering in bioreactor. The stress variation laws of the engineering tissue during growth were analyzed, and the strain loading rules were determined. A new mechanical stress loading device was developed, which was able to apply complex concurrent mechanical strains to three-dimensional scaffolds independently housed in reactor chambers. The AC servo control system was used to carry out tensional and rotational displacements. Well controlled mechanical stimulations could be applied to the developing ligament tissue, through the closed-loop control system for stresses, allowed different mechanical loading patterns on the scaffolds. We analyzed the strains of scaffolds fixed in circular and planar modes. The strain, motion, and position control methods were designed. This device is suitable for the bioreactor used in ligament tissue engineering.

Abstract: High-frequency and high-voltage excitation melting ice device is mainly composed of the excitation power supply and the notch filter device, which can realize the power transmission line melting ice without power cut. This paper applied power electronic frequency conversion technology to design a excitation melting ice device with 18KV/40KHZ.This device is adopted PWM control technology, and is mainly composed of the rectifier, controller and inverter. For the small frequency converter, the high-voltage frequency conversion function can be achieved through each phase in series divided voltage method. According to the 1000 kV AC ultrahigh voltage transmission lines, a melting ice model is set up by using SIMULINK simulation. The results show that this device can generate stable 18KV/40KHZ excitation melting ice electric energy in 30ms,and the control method is convenient and simple, the range of frequency and voltage modulation is big characteristics.

Abstract: In recent years, as one kind of Stirling engines, free piston Stirling engines are attracting world attention. Free piston Stirling engines could be applied to the solar dish system, micro-CHP system and so on. The development of a free piston Stirling engine is discussed in this paper. The ideal adiabatic model is used in the preliminary design of the free piston Stirling engine. The key parameters of the designed engine and the thermodynamic analysis are described in detail. Then the performance of the engine is obtained.

Abstract: The article presents the results from the researches related to the designing and documentation of tooth wheels for stamping within a CAD medium. In order to increase the quality and the competiveness of the products, there have been offered methods related to the process of constructing. There have been developed 3D geometrical models as die forgings of tooth wheels obtained by volumetric, thermal stamping. These models are to be used for the preparation of working drawings of the die forgings. The results are useful for the purpose of establishment of creative constructive solutions and optimal production expenses which would meet the requirements of the market.