Applied Mechanics and Materials Vols. 66-68

Abstract: Driven piles commonly generate excess pore water pressures in the surrounding soil. The reconsolidation of the clay around the piles is investigated, assuming that the Mechant model can be used to describe the visco-elastic features of the soil. The initial excess pore distribution away from the pile varies according to the cylindrical cavity expansion theory. The governing equation is derived under the continuity condition. The three-dimensional analytic solution of dissipation of the excess pore water pressures induced by pile driving is solved by the methods of separation of variables and using the Laplace transform and inverse transform. Then, a case is analyzed making use of the solutions. The results show the dissipation speed of excess pore water pressures around the pile is faster than that far away from the pile and the vertical dissipation rate increases along the depth.

Abstract: Based on the theory of nonlinear random dynamic and ship oscillatory motions, by analyzing the spectrum of the random ocean wave and the force of the ship, the roll and pitch motion equations were erected respectively, then the irregular waves were created according to the superposition theory. Meanwhile, the coupling motion between rolling and heaving was studied, then the time-domain responses were the driving data of the motions simulation. Using VisualBasic, the interaction interface was established. Using MATLAB, the motions were solved. Using OpenGL the 3-D model of ship was described. We just need input the ship and environment parameters then the results will be displayed with the 2-D figures and the 3-D model quickly, then the visualization of ship motions simulation is achieved. The program developed can simulate 3-D ships and can be used for designers to analyze the properties of ship intuitively.

Abstract: This paper discusses the method to generate the chaotic attractor of the continuous system by discretizing its state equation, based on the model of Lorenz chaotic system. Utilizing the DSP_Builder and Simulink the model is constructed and simulated. Then, on the basis of the former work, experiments on the hardware platform are implemented to verify the method. The result shows that the overall design is correct and efficient.

Abstract: This paper reviews joint inventory management models and discusses its contribution to improve the overall supply chain competitiveness, after discussing suppliers and agents’ plan model respectively. Further, based on the background of Company F, and combined the modern scientific management theory of supply chain inventory with practical case, it improves the inventory management method. Finally, the conclusion of calculation is presented in detail.

Abstract: To research thermal and moisture comfort of seamless knitted fabric made of triangle-hollow nylon which is developed newly, the paper chooses triangle-hollow nylon, circle-hollow nylon and ordinary nylon as fiber material and every nylon adopts weft plain, one-and-one mock rib and one-and-three mock rib for test weaving. Then nine samples are obtained. The paper analyses their air permeability, moisture permeability and warmth retention property. Result indicates that air permeability and moisture permeability of seamless knitted fabric made of triangle-hollow nylon are better than that of two other kinds of nylon’s seamless knitted fabric.

Abstract: The rotor motion and the information fusion of single section were discussed; the fault diagnosis method for rotary machinery based on the full information fusion of two sections was put forward, and the back propagation neural network model was established. Engineering practice indicated that the fault diagnosis accuracy based on the information fusion of two sections was higher than that based on the information fusion of single section.

Abstract: This paper explains the theory of the secondary rainbow and provides a test method of refractive index of the high refractive index glass beads. We carry out the optical design relate to the method, and design a refractive index test equipment. Additionally, we analyze the calibration requirements of the equipment and discuss the cause of error and measurement accuracy. The designed equipment can achieve a continuous, accurate, statistical measurement.

Abstract: In this paper, one newly developed method named the Improved Fourier Series method is applied to the vibration analysis of a beam elastically supported at the both end. The flexural displacement of the beam is supposed to be one set of Fourier Series coupled with four appended terms. Based on the Rayleigh-Ritz procedure and and the vibration characteristics of the beam are also acquired by solving these two matrices. In the end, the frequencies calculated are also compared with those from references and Results ar the Hamilton’s equation, the mass matrices and the stiffness matrices of the beam are obtained e all proved excellent.

Abstract: Variant design is a common technology in mechanical design, but it’s inefficient to measure the variant parts using the traditional programming methods. In order to get the inspection procedures of variant parts quickly, this article puts forward a method that aims at the automatic inspection planning of customized products, which based on tabular layouts of article characteristics (TLAC). It studies the TLAC of parts which included the tolerance, the main model and its inspection template, and generation of the inspection procedures about parts. The result shows that the method can effectively improve the efficiency of inspection procedure generation.

Abstract: In this paper, the analytical solution to the planar magnetic field of a linear permanent magnet Halbach array is researched on. First, the magnetic field of a current surface is derived from the magnetic field produced by the molecular current of the permanent magnet. The magnetic fields of pieces of permanent magnet with vertical and diagonal magnetization direction are both solved by combining the magnetic field of current surfaces with different directions. Then the planar magnetic field of the entire linear permanent magnet Halbach array is obtained by calculating the vector addition of the magnetic field of all the permanent magnet cubes using Denavit-Hartenberg (D-H) transform technique, which yields the closed-form analytical expressions. The analytical algorithm proposed in this paper can be utilized to design and optimize the Halbach array, which in result can greatly simplify the calculation and expedite the progress. The effectiveness of the proposed method is evaluated by the finite element analysis software Maxwell.