Abstract: The new CFG pile-board structure composite foundation is a ground treatment technique based on CFG pile foundation and pile-board structure composite foundation. It can make full use of the load distributing function of board, the bearing capacity and the deformation compatibility of soil between piles, by taking advantage of the pile-platform-soil interaction. A part of soft ground in a high-speed railway was taken as the engineering background and study object. The settlement controlling effect of common CFG pile ground and new CFG pile-board structure composite foundation were analyzed by finite element numerical method, and various factors to the effect on settlement-controlling were discussed. Pile-soil stress ratio of CFG pile and reinforced concrete pile were studied. Some useful conclusions of the numerical simulation of the new CFG pile-board structure composite foundation were obtained.
Authors: Chu Wang Su, Quan Ping Yuan, Jing Da Huang, Kang Yang
Abstract: The composite acoustics board with pore-tank structure and variable cross section structure are made of Medium Density Fiberboard(MDF) as base material, Mytilaria laosensis sheet as veneer board, and sound absorption mat as the substructure material with the micro-perforation interlayer structure. The test was carried out to compare the absorption coefficient of Mytilaria laosensis sheet and nine samples by standing wave tube The test result shows that Mytilaria laosensis sheet has a low sound-absorbing performance itself, and its sound-absorption coefficient in all frequency ranges less than 0.3 and cannot be used as the sound-absorption board alone; The variable cross section structure sound-absorption board has a better performance than the pore-tank structure; When using the micro-perforation layer structure, the sound absorption board performs better and the sound absorption coefficient improves markedly in middle and low frequency scope.
Authors: Shu Yi Yang, Hong Qiang Liang, Guo Qing Hou, Ping Yu Zhu
Abstract: O-shape board finite element modal in the thickness measurement system is established based on ANSYS. O-shape board topological optimal design is accomplished with reducing the volume ratio for constraint condition and the minimum flexibility of the overall structure for objective. The improved structure of O-shape board is analyzed again. Under the circumstances to meet the actual needs, the optimized structure weight is reduced and manufacture cost is decreased. O-shape board structure lightweight design is achieved. The result indicates that the proposed optimization design method is feasible.
Abstract: The objective of this study was to investigate the thermal property of thermal insulation board produced from admixtures of pineapple leaf fiber and natural rubber latex at different proportion level and the thermal property was evaluated based on the American Society for Testing Materials standard. Thermal insulation boards were fabricated using a hot pressing technique at a temperature of 150 °C under a pressure of 100 kg/cm2 for 5 min to form a squared thermal insulation with the size of 35 cm and 0.9 cm thickness. The thermal conductivity of the thermal insulation was 0.057 W /m K with density of 338 kg/m3. The success of this study primarily proclaims a high feasibility of producing thermal insulation from pineapple leaf fiber and natural rubber latex as a substitute for synthetic fiber.
Authors: Li Xin Guo, Rui Li, Jia Chao Cui, Jin Li Li
Abstract: The characteristics of vibration and noise of an automobile have become important factors for evaluating automobiles. In this study, finite element modal analysis and harmonic analysis were used to analyze the dynamic characteristics of the bus bodywork. The analytical results show that vibration of ceiling board and floor board is large while the engine remains the idle running. The vibration of ceiling board and floor board are large during the engine running with the idle speed or the highest speed. In addition, the vibration of ceiling board and floor board also has peak values during the engine running with the maximum torsion moment. Therefore, for prediction of vehicle bodywork vibration and vehicle interior noise, the influence of the engine vibration on them should be considered in order to avoid resonance of bodywork boards and coupling of bodywork boards and interior acoustic field.