Advanced Materials Research Vol. 507

Abstract: For the problem of lower precision as well as lower adaptability in non-equidistant GM(1,1) model, applying the new information principle, modeling method of Grey system and accumulated generating operation of reciprocal number, a non-equidistant new information GRM(1,1) model generated by accumulated generating operation of reciprocal number was put forward which was taken the nth component as the initialization. Based on index characteristic of grey model and the definition of integral, the background value in non-equidistant GRM(1,1) was researched and the discrete function with non-homogeneous exponential law was used to fit the accumulated sequence and optimum formula was given. The formula of background value of new information GRM(1,1) model can be used in non-equal interval & equal interval time series and has the characteristic of high precision as well as high adaptability. Example validates the practicability and reliability of the proposed model.

Abstract: Forward displacement analysis of parallel manipulators lead finally to solve the complex nonlinear equations, and its process is extremely difficult. The Newton iterative method is an important iterative technique for high-dimension nonlinear equations, but it is comparatively sensitive to initial value. To take chaos sequences as initial points of Newton iterative method, it can rapidly find all solutions of nonlinear equations. The novel approach of Newton iterative method based on parameter coupled hyper-chaotic mapping for solving nonlinear equations is presented. The mathematic model of the generalized 5SPS-1CCS parallel manipulator is created based on quaternion. A numerical example is given out, and its result is compared with the result of homotopy continuation method. The analysis results show that the new algorithm is simple, high efficiency, universal and can be used to forward displacement analysis of other coupled parallel manipulators.

Abstract: In order to improve the identification accuracy of fuzzy support vector machine for chalky rice, this paper puts forward a fuzzy support vector machine method based on fuzzy K nearest-neighbor. This method firstly gets a sample center by calculating sample mean aimed at every class sample; and then it calculates the initial membership of sample by calculating the distance between sample and center; finally, it calculates K neighbor points of each sample, calculates the membership of sample according to the fuzzy K neighbor method, and integrates the initial membership with fuzzy K neighbor membership at a certain proportion, to get the ultimate membership values of samples. Combined with image detection problems of rice, verify the validity of this method. Experiments show that this method not only can improve the accuracy of identification but also can improve its speed, with a better result than common fuzzy support vector machine.

Abstract: It is the development characteristics of modern sports to use of modern science and technology such as computers and others. In a variety of sports science, the application of science and technology in modern sport based on the mechanical analysis play an important role in order to improve athletic performance and motor skills, as well as the optimization of sports equipment. Therefore, The analysis on mechanical optimal motion can provide the athletes the best sports attitude and sports skills, thereby improving athletes scientific training result.To provide scientific theoretical basis and promote the development of sports, this paper focused on the scientific mechanics analysis on long jump technique.

Abstract: With the development of information technology, 3D scanning technology is applied more and more widely. Especially it has some advantage in technical characteristics such as processing large amount of datas, responsing to the events of measurement process in short time, which makes the 3D scanning technology be used more and more widely in garment industry. This paper mainly studies 3D garment design in the applicationof human body 3D scanner,which provides a research platform.for costume design for the development of the area.

Abstract: Relying on HTC3250µn and HTC2550hs high-speed precision CNC turning center, this paper analyzes the static and dynamic characteristics of CNC machine tool spindle with finite element analysis software. Based on the results and using ANSYS software, this paper considers the volume and amplitude of vibration model as the objective function to optimize the size of the spindle. According to the optimized size of spindle, this paper analyzes the static and dynamic characteristics of the CNC machine tool spindle again and concludes the optimization results.

Abstract: As re-development tools based on AutoCAD, VBA (Visual Basic for Applications) makes punching die of development, and compared with the traditional mold manufacture method it has a series of advantages like increasing productivity, improving product quality, reducing cost, and reducing labor intensity. This paper mainly introduces in VBA’s development environment to research parameter design through punch mould so as to improve the design efficiency.

Abstract: Empirical mode decomposition (EMD) provides a powerful tool for the nonlinear and nonstationary signals. This paper presents an application of the signature analysis based on high-order spline interpolation. The time-frequency analysis method based on EMD is introduced. The series data are separated into intrinsic mode functions (IMFs) with different time scale using EMD. The spectrum of Hilbert transformation is obtained by applying Hilbert transformation to every IMF. Based on cubic spline interpolation, high-order spline interpolation is used to improve the precision of the algorithm. Furthermore some strategies for improving the computational efficiency are proposed. The simulation result shows that the precision of the time-frequency analysis can be improved effectively using the proposed new algorithm.

Abstract: Water cellar is an important facility to collect rainfall at the arid and semi-arid areas in China. The numerical simulation was carried out for one type of common cellar structure with concrete cellar wall, bottom floor and brick-arch roof using ABAQUS. Elastoplastic damage constitutive model was adopted to simulate the form and location of cellar cracking under different loads. Simulation results show that the circumferential cracks occures at the out side of the cellar bottom floor and the vertical cracks occures at the top of the cellar wall without water in cellar. In addition, vertical cracks also likely occures at the top of the cellar wall when full of water in cellar. Additional circle beam at the top of the cellar wall can reduce the principal tensile stress of the cellar wall and causing stress redistribution to uniform in the cross-section of cellar wall. Numerical analysis of the different locations of the reinforced concrete wall of water cellar shows that the additional circumferential steel bars at the top of the cellar wall are effective in reducing concrete cellar wall cracks.

Abstract: In this paper,international geotechnical engineering analysis software FLAC was used to simulate the influence of tailings surcharge load at open- pit mine to overlying orebody mining at the north of Axi gold deposits in Xinjiang.Engineering geological properties and the process of establishing geological model of open -pit mine in the north of Axi gold deposits in Xinjiang were introduced .It simulated the laws of deformation,stress and plastic zone of the top and base of wall rocks of underground mining in two conditions. The result shows that tailings surcharge load has less influence on orebody mining so that it is a feasible project. But we should strengthen the safety monitoring of rock mass,especially for displacement and stress monitoring of the rock beam.