Advanced Materials Research Vol. 548

Abstract: In this thesis, the problem of elevator manufacture system in domestic practice was analyzed. The variables and parameters, which had an impact on the service quality of elevator traffic system directly, were presented detailed comparison and analysis. And then the expressions of these variables and values of parameters were edited, according to the situation of origin country. The computer aided design software was designed. Now, this VR simulation system software has passed the testing, and has also achieved successful application in design of elevator manufacture system.

Abstract: Stroke survivors and persons with disabilities age progressive decline in health and medical status can challenge the adaptive resources required to maintain functional independence and quality of life. Because of the lack of physiatrist, most individuals lose ability in body step by step and suffer physically and psychologically. For this reason, actions to recovery the patient’s freedom and mobility are imperative. This paper reports a solution to help patients to complete the rehabilitation without physiatrist. This solution considers virtual (VR) and augmented reality (AR) techniques to construct one training system with which patient completes the rehabilitation. And the proposed system is applied for supplying environment, guiding movement and providing information. Thus, this article reports on a solution designed by the authors to help patients during rehabilitation.

Abstract: Fracturing flowback rate is one of the most important parameters to evaluate fracturing effects. While calculation of fracturing flowback rate is always lack of theoretical model to predict, it is always been solved by accumulation of filed fluid after fracturing finished in oil filed. In order to tackle this problem, a great deal of work has been done to establish a model for solving fracturing flowback rate, in which procedures like fracture closing, fluid loss, formation fluid flows and well bore flow are entirely considered. Based on comprehensive procedures, a few functions are established in this model. The average fracture pressure was calculated by adjusting time that might affect fracture closure degrees. According to wellhead pressure, bottom hole flowing pressure and average fracture pressure which was used to calculate flowback quantity leaded by fracture closure were achieved. Besides, total time that fracture was entirely closed was also achieved after fracture being fully closed, flowback quantity consisted of two parts, fracture and formation. In addition, the model was solved through finite difference method and simulated by Matlab. In comparison with the target result, fracturing flowback rate, the modeling results, are almost identical with that of conventional methods. Therefore, this model can be taken as a reliable theoretical guidance to predict fracturing flowback rate in oil flied.

Abstract: As the matter of fact, the soil in all models of the base is considered as a homogeneous isotropic body, ttherefore, existing models of isotropic elastic strata near the buildings does not allow to consider the actual properties of soils: their small-layered structure, the inclination of layers, anisotropy and heterogeneity, in addition it does not take into account the location of objects relative to the plane of the strike of the inclined layers. This article describes the anisotropic (transtropic) calculated elastic model of a complex system of "ground-foundation-structure basis", which most adequately reflects the characteristics of deformation and taking into account the diversity of the elastic properties in different directions relative to the plane of small fibers.

Abstract: This paper presents a MEMS Piezoresistive pressure sensor which utilizes a circular shaped polysilicon diaphragm with a nanowire to enhance the sensitivity of the pressure sensor. The polysilicon nanowire is fabricated in such a way that it forms a bridge between the circular polysilicon diaphragm and the substrate. The high Piezoresistive effect of Silicon nanowires is used to enhance the sensitivity. A circular polysilicon nanowire piezoresistor was fabricated by means of reactive ion etching. This paper describes the performance analysis, structural design and fabrication of piezoresistive pressure sensor using simulation technique. The polysilicon nanowire pressure sensor has a circular diaphragm of 500nm radius and has a thickness about 10nm. Finite element method (FEM) is adopted to optimize the sensor output and to improve the sensitivity of the circular shaped diaphragm of a polysilicon nanowire Piezoresistive pressure sensor. The best position to place the Polysilicon nanowires to receive maximum stress was also considered during the design process..The fabricated polysilicon nanowire has high sensitivity of about 133 mV/VKPa.

Abstract: Based on virtual modeling technology and multi-body dynamics theory, three-dimensional virtual design and dynamics simulation was completed in this paper. Basic flow and general method of layout design of product using of 3D computer aided design software was presented. The frame model of layout was completed based on the structure and performance requirements of the dual-side-load trailer and 3D software’s CAD technology including parametric and variational technology and top-down design method. Based on the frame model, the layout design of the trailer was completed and the three-dimensional digital model was established. Took the lifting mechanism of the trailer as an example, based on its structure and operation principle, kinematics and dynamics simulation to each of the typical operation processes was completed.

Abstract: In order to make the front and rear axle braking force close to the ideal braking force distribution curves, this paper presents a new idea about the design of automotive brake systems. Firstly, the paper has studied the mathematical conversion relationship from the coordinate of utilization adhesion coefficient and braking strength to the coordinate of the front and rear axle braking force. On this basis, the optimal parameters and constraints complying with ECE regulation are determined. And the optimization objective is the degree of deviation between the curve of actual braking force distribution and the curve of the ideal braking force distribution. Taking a light truck for example, genetic algorithm is used to optimize the vehicle front-rear braking force distribution in the platform of MATLAB. Finally, it is proved that the result of global optimization can meet the design goals.

Abstract: In this paper we research the beam layout optimization to strengthen the stiffness of a tracked vehicle’ body. Based on CAD models of vehicle parts, a rigid-flexible coupling virtual prototype of the vehicle is constructed through body finite element meshing and modal analysis. The multi-body system dynamics simulation is conducted under several typical driving conditions. Loads acting on the vehicle body at several typical moments are exported and then imposed on the body finite element model to carry out the static analysis, such that the multi-load steps topology optimization for the hull is achieved. On the basis of the optimization results the local beam layout is modified and the vehicle virtual prototype is reconstructed. By re-executing the dynamics simulation, the change of the stress and deformation are compared. The simulation result shows the strength and stiffness of the body are improved. So the proposed scheme is effective for the body stiffness and could provide references for similar structural optimization problems.

Abstract: In order to conduct a comprehensive analysis and optimization improvements of the swash-plate engine, it is necessary to analyze and discuss the motion of the swash-plate completely. Based on the motion model of the piston and the connecting rod of the engine, the motion tendencies were simulated. The results suggest the circumferential distance can cause vibration, noise, and rough running of the piston and the connecting rod in the operating process. Besides, the inertia forces/moments and the unbalanced motion are considered to be the main sources of the vibration and noise. On the basis of the results, we propose a “∞” guide groove, which can reduce the vibration and noise of the swash-plate engine, to improve the kinematical parameters.

Abstract: With the changes in the way of the manufacturing, more and more enterprises managers and engineers and technicians begin to attach importance to the facility layout issues. The facility layout includes new production system design and the existing production system optimization. Therefore, there are broad application prospects in studying on the issues of facility design and optimization of manufacturing industry. This essay, based on the survey and analysis and summary of layout issues of facilities of manufacturing industry, and based on systematical layout design methods, conducts designs of facilities in manufacturing industry and studies the applications of the genetic algorithm in the facility layout and optimization in manufacturing industry.