Applied Mechanics and Materials Vols. 249-250

Abstract: The refined equations of special orthotropic piezoelectric plate are analyzed. Based on elastic theory, the refined equations of plane problem are derived by using Elliott-Lodge’s general solution and Lur’e method without ad hoc assumptions. The exact deformation field and exact stress field are represented by unknown functions with two independent variables. Based on boundary conditions, the refined equations for the generalized plane problem with symmetrical transverse surface loading are obtained.

Abstract: Based on cyclical symmetrical theory, static stress analysis of assembly body is achieved, then obtains the distribution of maximal and minimum stress. Cyclical symmetrical dynamic analysis of structure is also achieved, and works out the contacting status, frictional stress, siding distance, penetration, gap and contacting pressure under cyclical analysis. Contrast to the traditional ensemble analysis methods, it turns to be more efficient and more precise, and all the parameters are better distributed, finally testifies the scientificity and feasibility of wheel-axle contacting analysis methods based on cyclical symmetrical theory.

Abstract: The defects of constant displacement pumps hinder the modern vehicle to achieve its energy saving goals. Variable displacement pump is becoming the focus of research and development. In the paper, the displacement adjusting mechanism in the pump is treated as a rigid, and its motion leads to a continuously deforming and moving fluid domain. ALE method is used in CFD to overcome the difficulties of the fluid-structure interaction exists in the variable displacement pump. The moving regularity of computing grid and the boundary conditions of the ALE method are reasonably specified, to minimize the computing complexity in the coupled analysis. Experiments on prototype prove the performance of the pump in flow rate and energy saving. The results of analysis agree well with the experimental data, and the motion of the displacement adjusting mechanism is analyzed accurately.

Abstract: The characteristics of the self-synchronization in the offset self-synchronous system are put forward. In the paper, based on Lagrange principle, a dynamic model is derived to give its electromechanical-coupling model, which is provided with many variable no-linear characters. A serious of the practical phenomena in the transition process of the system is reasonably explained using the numerical solution simulation, and the variations rules of each parameter in the system are discussed at several types of the typical status. Finally the characteristics of the self-synchronization in the system are generated under the action of the electromechanical coupling. The visually processes are shown in the simulation results, for which the conventional mechanic models are unavailable to explain quantitatively, in which the vibration machines implement fully the transition from asynchronous to synchronous state or from one type of synchronous state to other type. It is fully verified that the system is with the self-healing synchronous ability, and the synchronous movement rules in the electromechanical coupling system are also revealed. For its research not only it is useful to explore the electromechanical coupling model of the offset self-synchronous system, but also it is in-depth to study synchronous motion rules of the self-synchronous system, and it is of the theoretical and practical importance.

Abstract: With the higher and higher etching rate, the flow field situation of the plasma etching chamber became an important factor to design the etcher chamber structure. This paper studied the etcher nozzle structure in detail by using the flow simulation technology to analyze how to get uniform follow field on the surface of the etching wafer, and then this paper determined the structure parameters of the etcher nozzle.

Abstract: The advanced actuator is a kind of swaying mechanism being an ingenious combination of high pressure oil cylinder and ball helical transmission, has lots of advantages, such as the torque produced by its unit weight is the greatest, dimension is little, weight is light, mechanical efficiency is efficient, service life is long, reliability is high, etc, it may be widely applied to varied occasions which need swaying mechanisms with low rotational speed and great torque.This paper firstly introduces mechanism composition and working principle of the advanced actuator.Then gives ascertaining methods on such key parameters as helical lift angle,pitch diameter,ball diameter,oil pressure and internal diameter of oil cylinder, etc.Next summarizes the analyzing and designing methods of the advanced actuator in a systematic way.Lastly points out three problems requiring thorough study.Successful development of the advanced actuator is an example of fulfilling major project by adopting modern method of design.Its systematic methods on analyzing and designing make further advances on the theories of ball helical transmission.

Abstract: Actuator is a kind of swaying mechanism whose power source is the hydraulic pressure oil, which may be widely applied to varied occasions where need swaying mechanisms, such as aircraft, tank, ship, train, etc. An aircraft needed a most advanced actuator which can produce torque up to 28kg•m with its unit weight, and set strict demands on such indexes as weight, dimension. According to existing plan, an actuator was designed and manufactured, being far inferior to requirement, which adopted a complex gear train composed of 2K-H and 3K planetary reductors. On the basis of analyzing existing dozens of reductors, a new structure that achieves swaying with multi-start ball guide screw driven by reciprocating piston rod of high-pressure oil cylinder was put forward. Having analyzed and compared more than ten new type of plans, a structural model of straight-rotary ball pair was proposed, an ideal plan of identical radius ball-return was found, a new spatial tight ball-return curve was designed, and the optimal design of the advanced actuator was finished. Computer simulation and prototype experiment made clear that each index of the advanced actuator could satisfy the aircraft’s demand.

Abstract: Three inversions of the offset planetary train with bevel gears were studied.On the basis of kinematic analysis, the calculation method of efficiencies and train ratios of these transmissions were obtained.

Abstract: In this paper, according to the characteristics of caterpillar vehicles, taking the PC200 excavator as a model, a caterpillar chassis model is established using analytical finite element method by the software Analysis. According to the characteristics of operating status, the load distribution of supporting wheels, at horizontal support, across the slopes at 10°, in the state of climbing 30° slopes, is analyzed. Effective support area of any three wheels is analyzed to obtain. The condition of focus circle and vehicle stability is determined. The maximum load of static stability is obtained according to the method of stability of three wheels. The results of calculation provide load support for the strength analysis of caterpillar chassis components and stability analysis, It also provides the supporting data for the structural optimization.

Abstract: The basic concept and main content of the green manufacturing and green manufacturing process are reviewed in this paper. And Green NC Transformation of Lathe C6132 is given based on the basic idea of the green transformation, according to requirements of the green design system.