Applied Mechanics and Materials Vols. 16-19

Abstract: Aiming at the control synchronization problem of the dual exciting motors in nonlinear vibrating system, based on the phase-difference state space equations, to establish the nonlinear sliding mode controller for the control synchronization of dual exciting motors. The results of the numerical simulation indicate that the control synchronization by sliding mode control strategy can effectively reduce the synchronization error which caused by the performance difference of motors etc., under system sharp resonance conditions (resonant frequency ratio z=0.95~1.05).

Abstract: For the complexity and miniaturization of MEMS, MEMS design process is extremely different from general mechanical design process. Commonly the design flow is dominated by “trial-and-error” methods. It is necessary to describe design process of MEMS for reuse. This will help to reduce the number of redesigns and thus decrease the time to market. Based on XML and necessary extensions being made, a MEMS design process description language, called MDPDL, is presented and the syntax and implementation are discussed in detail. The Document Type Definition (DTD) is adopted to define the syntax rules for the tags of MDPDL, considering core activities and related resources of MEMS design process. Finally, an implementation case has been given out to illustrate the efficiency of MDPDL.

Abstract: In this paper, a method of analyzing the reliability of tooth surface contact strength was presented and several kinds of errors of tooth shape were taken into consideration. In the method, experimental design method and Finite Element Method (FEM) were used to get the samples of tooth surface contact stress, and then Weibull distribution was used to fit these samples. On the basis of both stress and strength obeying to Weibull distribution, the reliability of tooth surface contact strength was calculated. The result of the calculation example indicates that the method is correct and effective.

Abstract: In order to meet the requirement of mass customization and rapid response design, a hierarchical parameterized modeling method of parts and components library is proposed. The library of parts and components is building up with NX/Open development tools based on the three-dimensional design software platform. According to this method, the master model technique is integrated with top-down modeling method to facilitate the parameterized modeling and variant design of product family. The parameterized modeling process is also demonstrated in details in this paper. As an example, a tools management system for NC machine tools rapid design is developed. It shows hierarchical parameterized modeling method is a practical and effective method of constructing the product resources library.

Abstract: The new-generation standards of Geometrical Product Specifications (GPS) take the measurement and verification of manufactured parts according to the duality principle. The Specification Surface Model (SSM) is a simulation model of the actual manufactured part which plays a decisive role in the process of duality verification. The existing methods, however, have not been found to carry out much related research on the generation of SSM. This paper presents a method to generate the SSM for the characteristic of planar feature with flatness under the standards of GPS. The mathematical model of the flatness tolerance is firstly established. Secondly, in order to get the simulation points to simulate the actual characteristics of the manufactured parts, both of the functional requirements of the parts and the influences of the manufacturing process are considered. And then the simulation points under the normal distribution are generated within their tolerance zone by computer. By using the approximation method of the least-squares SSM is then obtained. Finally, an example is used to illustrate the proposed method.

Abstract: The core of shape control depends on the control of the rolling seam. At present, bending rolling control system is used extensively. It mainly depends on the hydraulic cylinder which generates bending rolling force to improve the shape. The dynamic characteristics of bending rolling force have a big influence to the shape. This paper builds the theory modeling firstly, and takes the advantage of MATLAB to simulate and analyze the key characteristics of bending rolling force.

Abstract: The development process of vibration roller is a collaborative and concurrent process involved with mechanics, electronics and hydraulic disciplines. Poor collaboration among multiple design disciplines can result in frustrating re-work, delayed product launches, blown budgets and sometimes even expensive recalls of shipped products, which is a big challenge to vibration roller development for the traditional Chinese manufacturing enterprises.Workflow technology in vibration roller development is studied and applied in this paper. A workflow model is given, which comprises team member management model and process model. Team member management model defines the organization, the role and the authority of integrated product team (IPT) members involved in the development process of vibration roller. Process model described the general development process of vibration roller, which includes activities, roles related to activities and rules in detailed. According to the models defined above, new workflow software, which is named “Workflow Management System for Mechatronic System” is developed and used to implement the workflow of “the cooperative development of Vibration roller (YZ18JA) of ChangLin Company”. Practice indicates that the implementation of workflow technology can ensure that right information can be delivered to right person at right time in a right way so as to improve the management and control of the whole process, shorten product development cycle and reduce cost.

Abstract: This paper presents an extended object model for case-based reasoning in product configuration design. In the extended object model a few of methods of knowledge expression are adopted such as constraints, rules, objects etc. On the basis of extended object model, case representation model for case-based reasoning is applied to product configuration design system. The product configuration knowledge can be represented by the extended object. The model can support all the processes of case-based reasoning in product configuration design such as case representation, indexing, retrieving and case revising. The model extends traditional object-oriented model by including the relationship class used to express the relation between the cases, constraints class used in the product configuration knowledge representation, index class used in case retrieving, solution class used in case revise. So the product configuration knowledge that used in the product configuration design can be represented by using this model. In the end a Metering pump product configuration design systems is developed on the basis of the proposed product configuration model to support customized products.

Abstract: The finite element simulation of metal machining is a complex process. It is essential to develop a system to construct a model of simulation so as to obtain simulation data conveniently and rapidly. The paper detailed the parametric modeling. The key techniques of 3D modeling with MSC.Marc software and the parametric modeling procedure of metal oblique cutting process were presented in the paper. The modeling rule based on the procedure file was investigated. The interface of the system, designed using C++ Builder, could access data, which includes the geometrical angles and dimensions of a tool, the sizes of a workpiece, the relative position between the tool and the workpiece, their properties and cutting conditions, etc.. The procedure file, which is able to model in the MSC.Marc environment, was created by the program automatically. Calling the file, the system can finish the parametrical modeling of the finite element simulation. Then an example was given and the simulation model was also run. It was proved that the parametric modeling is an effective way for metal cutting simulation.