Applied Mechanics and Materials Vols. 300-301

Abstract: In order to realize high efficiency and high integration of the virtual manufacturing system and strengthen the integration of CAD/CAPP/CAM, the paper presents the architecture of virtual manufacturing oriented CAPP system and its realizing method. The method of parts information input is used for the system to connect with CAD directly. The system utilizes object-oriented knowledge representation method and database technology, establishes process knowledge database and carries on the effective management. Using the idea of modular, the virtual processing information can be fed back to design system in real-time, the process can be optimized it and form a closed loop CAPP system by using genetic algorithm. The virtual manufacturing technology of CAPP system enhances the design level and quality and improves the flexibility, scalability and dynamic adaptability of CAPP system.

Abstract: This paper provides improved genetic algorithm to solve productivity efficiency in Collaborative Manufacture System (CMS) according to its own characteristics.This improved algorithm not only improved coding method but also improved crossover method and mutation method.And the simulation experiment result in CMS validated the productivity efficiency promoted compared with improved and standard genetic algorithm.

Abstract: Cutting is an effective device to reduce crosswind loads acting on trains. The cutting depth, width and gradient of slope are important factors for design and construction of cutting. Based on numerical analysis methods of three-dimensional viscous incompressible aerodynamics equations, aerodynamic side forces and yawing moments acting on the high-speed train, with different depths and widths of cutting，are calculated and analyzed under crosswinds，meanwhile the relationship of the gradient of cutting slope and transverse aerodynamic forces acting on trains are also studied. Simulation results show that aerodynamic side forces and yawing moments acting on the train（the first, middle and rear train）decrease with the increase of cutting depth. The relationship between transverse forces (moments) coefficients acting on the three sections and the cutting depth basically is the three cubed relation. The bigger is cutting width，the worse is running stability of train. The relationship between yawing moments coefficients acting each body of the train and the cutting width approximately is the three cubed relation. The transverse Aerodynamic forces decreased gradually with the increase of the gradient of cutting slope, the relationship between yawing moments coefficients acting each body of the train and the gradient of cutting slope basically is the four cubed relation.

Abstract: There are many nonlinear switch loads in a marine power system. In order to anlysize the influnce of nonlinear switch load on the operation parameters of a marine power system accurately , a simulation of a synchronous machine with the rectifier load in three phase coordinate systme is studied. The simulation results are completely consistent with the real physcial process, which proves the validity and accuracy of the simulation method.

Abstract: The paper presents the research of chaotic phenomenon for the synchronous reluctance motor. Chaotic phenomenon looks like confused but regular. Nonlinear characteristic of the system causes chaos happened. System parameters and initial value variations cause the result dramatically. We establish the synchronous reluctance motor chaos model, the equilibrium points and characteristic equation by motor model. We utilize the Routh-Hurwitz stability criterion to obtain speed controller parameters,and to calculate the initial value by computtation of Lyapunov exponent to determine whether the system is in chaos behavior. We simulate it by using Matlab/Simulink software.Hardware achieved by using DS1104 processor board, which is the product of the dspace. Simulation and experiment results confirm the proposed theory is correct.

Abstract: Capability Maturity Model Integrated (CMMI) can be help to evaluate the development processes of manufacturing system software according to qualitative and quantitative development progress when the system developer or engineer design and develop their system. As well known, the development progress for manufacturing system is very complex. In this paper, we identify and make the development model for manufacturing system software. In order to make the efficient the model, we use CMMI process.

Abstract: In order to solve the problem that design resources can not be effectively reused, variant design is used in engineering field. Knowledge is the key factor implementing strategy of variant design. This paper puts forward the knowledge classification, process model, information resource base and reasoning model for variant design. Knowledge of variant design is classified into product domain knowledge, variant design methodology and basis theory knowledge, variant design process combines top-down mode to bottom-top mode, its corresponding information resource base includes case base, knowledge base and database. CBR is the core for design reasoning. The frame of knowledge-based variant design system includes resource base, resource management, variant design and evaluation subsystem. Using the system, designer could reuse design resource and reduce developing cost.

Abstract: Industrial technology and its engineering depend on the integration of new technical trend, devices, its application and their business management processes. It also needs to consider the various situations in their working environment. Therefore, the system software engineer has to design the manufacturing system software considering accurate user need, system software requirement and matching their process to the machine in the design level when they make or develop the system software. In this paper, we discuss and make a process model for manufacturing system software. The software process model can be dynamical arrange their module when it needs re-arrange the sub module.

Abstract: With the development of the technology of mobile communication, smartphones have become one of the most popular ways that people get information. However some restrictions such as the screen size, ambient brightness etc. still cause some troubles to read news by smartphones. We based on Android designed an audio news software system by means of the speech synthesis technology which can afford pleasure to listen to information. Using the Andriod technology we developed the smartphone client software which can get the latest information in RSS channels by communicating with the server. Also, it can dynamically manage the RSS channels subscribed by yourself. In the design, we used the techniques of the Android UI framework and component which made the smartphone interface succinct and easy. In order to improve data store efficiency we implemented the data modification and store by transforming between the Json format and the Java object. Based on the iFLY mobile speech platform we developed the audio news player. The function of information automatic acquisition in the server made it possible that smartphones can get the latest information of the subscription channels.

Abstract: In order to improve the efficiency and environment-friendliness of urban rail vehicles, a new hybrid electric locomotive is proposed. The general structure of the proposed hybrid electric locomotive is given and analyzed from a dynamics point of view. The calculation method of power output and its allocation strategy is discussed. A simulation is conducted in HELSP(Hybrid Electric Locomotive Simulation Platform) to verify the performance of the power allocation strategy. The result indicates that the function of allocating power can be properly realized, and the regeneration energy from frequent braking can be absorbed by the power storage of the vehicle.