Applied Mechanics and Materials Vols. 55-57

Abstract: The problem of planar crank-slide mechanism synthesis is transformed into nonlinear equations to be found, Newton iterative method is an important technique to one dimensional and multidimensional variables and iterative process exhibits sensitive dependence on initial guess point. For the first time, based on the study of statistic property of Logistic mapping, a new method to find all solutions of the nonlinear equations based on utilizing chaos nested intervals of Logistic mapping to obtain locate initial points is proposed. The numerical example shows that the method is effective. This provides a simple realization method for mechanics design.

Abstract: A CRF model is proposed to extract the high level behaviors based on the position information of the elders in household environment. Firstly, the slide time window is used to segment the time-order position data which is then transformed into the position-based information including position region No., speed and direction. Then, we take the information as the observation data to construct the CRF model, learn the model parameters, and achieve to extract the high level behavior state sequences which can be applied to detect the abnormality of the elders. The experiment results show that the proposed method can identify the behavior states with a good rate of identification accuracy.

Abstract: The Al-7%Si /9% Al₆₃Cu₂₅Fe₁₂ composites were fabricated by mechanical stirring method. The composite took Al-7%Si as matrix, Al₆₃Cu₂₅Fe₁₂ icosahedral quasicrystal as reinforced particles. The microstructure and chemical composition of composites were investigated by means of SEM and energy dispersive spectrum (EDS) analysis and the mechanical properties was also measured. The results showed that Al₆₃Cu₂₅Fe₁₂ particles were fractured and passivated after added into the Al-7%Si matrix, and distributed homogeneously along the crystal boundaries.The quasicrystal was not decomposed. Mechanical properties of the as-castand alloy were improved obviously.

Abstract: A new method for extracting spectrum feature of motor unbalance and interference of alternating current (AC) is proposed. The flatness error of workpiece surface includes much errors information, and the information contains high frequency signal and low frequency signal, for these errors information, a new identification method of turning errors of workpiece based on the wavelet transform and power spectral density analysis is proposed. According to the focal variation character of wavelet and the energy value of power spectral density analysis, the feature of motor unbalance and AC from the measured flatness error of workpiece is extracted and identified.

Abstract: This paper introduces the theory of grillage method, principles and grillage beam meshing as well as the performance calculation of grillage member section in detail. The finite element software Midas / Civil is used to establish the continuous box girder bridge model for the comparative analysis between the grillage method and single girder method, and the results show that the precision of grillage method can meet the needs of the engineering design.

Abstract: This paper elaborates on the similarity theory applied in the design of the full bridge wind tunnel aeroelastic model for the large-span tied-arch bridge and, taking a Yangtze River Bridge as an example, introduces in details the design method and parameter testing for a full bridge aeroelastic model.

Abstract: As a new type of entertainment venue, four-dimensional cinema can make the effects of rock, collision and weightlessness using innervation seat controlled by a computer. At the same time, audience can feel the film scene such as storm, thunder, rain, bounce, spray and beating in the cinema. So the performance of innervation seat directly influences the effects of a four-dimensional cinema. In this paper, a compact innervation seat driven by four air cylinders is designed. The kinematics and dynamic characteristics of the seat are analyzed based on Adams. Then, the modal characteristics of the seat are analyzed by Adamas/vibration. Finally, the defects of the mechanism and the improving methods are suggested so that the innervation seat can be more safety and comfortable.

Abstract: The next generation of scientific experiments and studies are being carried out by large collaborations of researchers distributed around the world engaged in analysis of huge collections of data generated by scientific instruments. Grid computing has emerged as an enabler for such collaborations as it aids communities in sharing resource to achieve common objective. This paper defines the problem of scheduling distributed data-intensive application on to Gird resource and presents a formal resource and application model for the problem.

Abstract: Based on research about patterns of garment, patterns were made to achieve data and interval of the bust eases. On the basis of bust eases, a series of shape profiles in different eases of garment were designed and distinguishing experiment was done according to the theory of psychics, which profiles in different eases were distinguished. The shapes in different fit were classified into four clusters: tight fit, fit, little loose and loose. The results of experiment were analyzed by k-means cluster method and quantitative classification based on bust ease was achieved. It opens our mind to make garment research by data mining method. A new method for garment fit research and classification exploration of outline shape was brought forward, which it offers reference for garment industry and research for automatic computer distinguishing technology.