Applied Mechanics and Materials Vol. 312

Abstract: Aimed at the stability problem of feeder, we study distribution characteristics of separator shaft torque. By a kinematic and dynamics analysis of typical feeder Mechanism, we get the force of feeder camshaft and distribution characteristics of separator torque. We study the fluctuation of separator torque using the developed feeder torque test platform. The study shows that: the theoretical analysis and experimental research of separator torque distribution is basically consistent.

Abstract: Based on the theory of acoustic propagation, the realization mechanism of longitudinal-torsional vibration (LTV) by converter of cylinder with multiple diagonal slits (MDS) under single excitation was studied. The influences of composite stepped horns structural parameters on resonant frequency were studied by numerical analysis method, and the horn (resonant frequency about 20kHz) with LTV was designed. The results show that LTV could be realized under single excitation of longitudinal vibration when resonant frequency is 20498Hz, and the amplitude varied periodically. The results can be applied in the design of acoustic system in ultrasonic machining with LTV.

Abstract: The research on structure optimization for the fir-tree root and rim of a steam turbine blade with complex damping structure was conducted by three-dimensional contact finite element method and mathematical optimization algorithm. A multi-variable parametric model of three turbine blades and rims with fir-tree root and rim was established. Twelve critical geometrical variables of the root-rim were optimized to minimize the maximum equivalent stress of the root-rim. The optimal structure of the fir-tree root-rim was finally obtained through the optimization process and the equivalent stress of the root and rim both had evident reductions, Compared with the initial structure, the maximum equivalent stress of the root and rim reduced by 13.47% and 12.26%, respectively. Relevant work is expected to support the design of turbine blade root-rim in theory and improve the operation reliability of turbo-machinery to some extent.

Abstract: In this paper, a stage structured model with delay that competition occurs between the two adults of species is studied. The permanence and the stability of the nonnegative equilibrium are analyzed. Some sufficient conditions which guarantee the permanence of the system and the stability of the boundary and positive equilibrium are obtained respectively.

Abstract: According to the work principle of the automobile manual gearbox, the author has designed a new type of automobile driving trainer simulated gearbox. The principle of the simulation of various organization compositions of gearbox and the simulation of the feeling to the real organization function and the operation dynamics are introduced, and the practical application effect of the simulated gearbox has been summarized at last.

Abstract: This paper proposes a cam curve synthesis method based on classical splines. The cam curve is described by the classical spline of order 6. Corresponding equations and boundary conditions are given to satisfy the specific requirements of the cam design problem. Then, a universal computation method is given and an example to illustrate the effectiveness of the proposed method is presented. It is shown that excellent design result can be gained easily, and the designer can adjust the interpolation values of the interior knots of the spline to change the cam curve in a local influence without any violation of the specific constraints.

Abstract: Heterogeneous metal sandwich plate is composed of high strength material face-sheets and low-density material core. In this paper, the crashworthiness property of the heterogeneous metal sandwich plate was investigated with combining the response surface method and finite element simulation. The specific absorption energy of sandwich plate is made as the crashworthiness performance index, and approximation written as a third-order function of the section parameters by means of the response surface method. According to the BB experiment design method, 29 groups of sandwich plate with different section structure parameters were selected and finite element numerical simulations were conducted to study on deformation behavior of sandwich plates during the collision process. Then, the coefficients of approximate specific absorption energy function were solved with regressive analysis. Consequently, the relationship between the crashworthiness performances of sandwich plate and the section parameters α, β, D, d was obtained.

Abstract: Autonomous Underwater Glider (AUG) is a kind of unmanned underwater robot. Weight reduction is an effective measure to extend the duration performance and increase the carrying capacity of the AUG. In this paper, on the basis of the application of ANSYS-workbench, optimization for the structure and mass of the pressure hull of the AUG was conducted through the goal-driven optimization (GDO) method. After optimization, the total mass was reduced from 12.74 kg to 11.06 kg. The present work plays a key role for improving duration performance of AUG.

Abstract: This document introduce about the physical principles of liquid crystal display (LCD) and plasma display (PDP), discuss the physical imaging principle of the new style display. The LCD works with lower voltage and power, and lower calories radiation, no nuclear radiation, complete flat surface, restore the picture by the square, a strong ability to anti-interference, appearance stability and not gleam. Its researched here in the aspects of the basic principle about display. In addition, While add a little amount gas of Xe in the Ne, the atom of and atom of Xe will collide frequently, and cause the Xe ionized, then release the ultraviolet ray. this ultraviolet ray excite visible light from the fluorescence powder, thus realize the picture rebuild. Choose different fluorescence powder material, we can carry out three primary color rebuild.

Abstract: With the development of new energy vehicle, the current air conditioner technology has been unable to meet the requirement of future automobile. In this paper, the characteristics of traditional automobile air conditioner is summarized. And several new air conditioners, adapting to the new energy vehicles are putted forward. Compared with traditional air conditioner, these new air conditioners are more possible to be used in the future vehicles.