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    • Construction Mechanics Analysis of Long-span Steel Structure Based on Vector Form Intrinsic Finite Element Method

      2016, 43(3):48-54.

      Keywords:long-span steel structure construction process Vector Form Intrinsic Finite Element(VFIFE ) tensioning cable element jack element
      Abstract (782)HTML (0)PDF 1.60 M (1180)Favorites

      Abstract:Since the long-span steel structure is prone to perform nonlinearity such as yielding rigid body motion under construction loading, construction process analysis was conducted by the Vector Form Intrinsic Finite Element method (VFIFE). Based on the basic theory of the VFIFE, the tensioning cable element was introduced to simulate the tensioning process by adjusting the length of the cable element. In addition, the jack element was used for the unloading analysis of the long-span steel structure. Moreover, the VFIFE based program was developed by the MATLAB, and compared with the conventional method by means of three FE models such as the assembly of cantilever beam, the tension forming of cable truss, and the tensioning construction of long-span truss string structure. To this end, the VFIFE theory and program were verified and validated. The result showed that the assembly, tension forming, and unloading of the long-span steel structures could be reasonably simulated by the VFIFE.

    • Integrated Simulation of Wind Turbine Based on Vector Form Intrinsic Finite Element

      2016, 43(11):141-148.

      Keywords:wind turbine vector form intrinsic finite element numerical simulation operation condition nonlinear analysis
      Abstract (1246)HTML (0)PDF 2.49 M (696)Favorites

      Abstract:Large wind turbine system is a periodic time-varying system with rigid-flexible coupling multi-bodies. The traditional finite element method cannot solve the singular stiffness matrix produced by the rotation of blades. However, the vector form intrinsic finite element method can effectively solve the geometric deformation of elastic continuum, the nonlinear or discrete constitutive model, the coupling motion of continuum and rigid body, and so on. In this study, a solver program of space beam elements was developed by the vector form intrinsic finite element method with MATLAB code, and verified by two typical examples where one is a cantilever method with a dynamic force acting at the end, and the other is an Euler beam rotating around a fixed axis. The integrated simulation of wind turbine system that consists of tower, rotor blades, and nacelle was then established, and its dynamic response of free vibration under parking was analyzed. The natural frequencies of the turbine system were obtained by modal parameter identification, and they agree well with the results obtained by traditional finite element method. Moreover, the weighted amplitude wave superposition method and proper orthogonal decomposition method as well as B-spline surface interpolation were employed to obtain the wind time series of wind turbine under the normal operation condition. The wind-induced dynamic response of wind turbine system was also calculated by vector form intrinsic finite element method. The results reflect the periodic influence of gravity on the internal forces of blades and the interaction between blades and the tower.

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