Advanced Materials Research Vols. 308-310

Abstract: In this paper ,we ared study on the reinforcement of a large opening with which the opening ratio is (W)0.8 with numerical calculation. We analyzed the Mechanical characteristics of opened shell It shows the stress concentration is seen clearly on point A which is between Connecting Inside surface of pipe and shell ,and point B, which is between Connecting outside surface of pipe and shell. And the stress concentration on point A is more than on point A when the opening ration(W) is 0.8.And it is calculated reinforcing effect and analyze the limitation when the opening ration by pressure area method（Referred to PAM）.It is obtained the limitation of PAM by comparing numerical calculation to PAM.

Abstract: The model of complex product systems involves mechanical, electrical, hydraulic, control, thermal and even aerodynamic domain. It also simultaneously includes discrete state behavior and continuous dynamic behavior. In order to support the development of complex product systems, in the paper, a behavioral modeling methodology considering multi-domain and hybrid behaviors is presented. The individual behavioral models are firstly developed and then the behavioral model of the system is composed by connecting the individual behavioral models. Some simple syntax and semantics is provided for supporting the construction of the behavioral models. In order to analyze performance of the systems, the behavioral model should be transformed to unified multi-domain model which is formulated in Modelica language. The mapping specifications including model declaration, hybrid behavioral modeling and model interface are presented.

Abstract: This paper studied on the key technology of synchronous modeling- face finder and geometry index and flexible and rigid solve on platform of NX 6 and windows. This technology supports modeling by identify a range of input faces and geometric conditions of a group faces to search, find and choose faces by face finder, and solving surface-related acts of movement at the same time. While the technology was theoretical analyzed, the practical examples was also employed to testify the efficiency of the technology. Parametric or non-parametric 3D models were modified by the operation of face moving, face copying or face choosing, and face transforming to revise the position relationship among faces. Thus the topology structure of the model is altered, and product model design and modification work is completed efficiently.

Abstract: As an advanced design idea nowadays, to realize body’s healthy movement, healthy industrial design (be called HID for short) pursues user’s “health, happiness and joy”, Different types of limits will be treated dynamically for this goal during the whole design process. The adjustable limit will be treated by changing the subjective reason leading to it, while the un-adjustable limit will be treated by optimizing user’s behavior and producer’s structure, material, color etc.

Abstract: Product configuration design and simulation analysis are of critical importance in the rapid response to performance-driven product design. Product configuration design is the transition from customer specifications into physical solutions, while simulation analysis compared with testing result explains that physical solutions are correct and applicable to engineering. Configuration rules play an important role in the product configuration design. Finite element analysis (FEA) has been used widely in the simulation analysis. We could regard the simulation data of FEA as the important knowledge source of configuration rules. Then, a methodology of integration between product configuration design and simulation analysis is proposed to realize the dynamic update of configuration rules. An application of a clamping unit of injection molding machine that illustrates the proposed approach is developed at the end of the paper.

Abstract: In this paper , key techniques of feature extraction in reverse engineering is studied. First use a method to extract the feature points from scattered points based on Gauss curvature extreme point. Use these feature points to make cloud data segmentation. Then quadric surface feature and free-form surface feature can be separated. The quadric surface feature can be fitted by quadric surface parameter equation with LSM directly. However the free-form surface feature should be extracted based on section feature recognition. This method has several steps: First ,a adaptive slicing algorithm is used to get section data from point data . Then feature points from section data is extracted. And these feature points are regarded as the gist to recognize section feature. When the section feature is recognized, they should be fitted with LSM, and then skinning method is used to reconstruct free-form surface modeling.

Abstract: For the time varying of signals, empirical mode decomposition (EMD) is occupied to modulate signals; auto-regressive moving average (ARMA) of higher accuracy is used to establish model for the signal principal components; then parametric bi-cepstrum estimation is implemented and fault feature is extracted. The test results about gearbox of overhead traveling crane indicate: the feature quefrency can be obtained through method of EMD and ARMA model parametric bi-cepstrum estimation.It is a kind of effective fault diagnosis and stability evaluation method.

Abstract: A new design of using FPGA to realize array beacon light switching is preferred. Based on spatial diversity laser communication, the problem of multiplexing beacon light celerity and synchronism switching has been settled. Karnaugh map method was used in the paper to generate the time sequencing driving four motors, which was used in the schematic diagram design. Experiment results show that the system(or the design) in this paper cooperated with multiplexing beacon light has been realized, which simplifys the traditional beacon light switch system frame.

Abstract: The power performance and the fuel economy are both the important indexes of the automobile. To designing a certain vehicle, when the total weight, distribution of the load and the tyres are specified, in traditional ways, it needs to do a lot of the dynamic calculation work and numerous experiments to get the parameters of proper engine and power train. This paper, Based on mathematical model, the simulation for automobile power performance and economy is designed. The calculation on actual vehicle is taken with this software and calculated values are in good agreement with the practical data. The analysis of influence of some chief factors on automobile power performance and fuel economy is carried out, which can provide the reference guide for automobile design.

Abstract: The living creature evolve into various kinds of animals after a long time, there also is the law that includes evolvement, variation and complex at the formation of all machines. The machine evolution laws were analysed and concluded from the standpoint of mechanism in this text. The diagram of evolution form listed on show reflects the internal evolution law of mechanism. The multiple development of mechanical structure relys on the evolvement of and the variation of machine parts. The birth of pioneer product also relys on the evolutionary logic to expand.