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DQM is widely used to solve common boundary conditions of a variety of structures, but rarely applied to the complex boundary conditions corresponding to the actual projects. Most of the time , what is obtained is the dimensionless frequency, which can not be applied directly to the general engineering design. In this paper, the common towering structure engineering is studied, which is equivalent to a variable cross-section beam mechanical model. DQM is adopted to find its natural frequency and do comparative analyses. Finally the inherent characteristics of structural variation under various conditions are summed up in order to provide a theoretical reference for issues related to projects. The consistency of the theoretical analysis and numerical solution suggests that DQM works feasibly in engineering calculation for this kind of model. Introduction Multi-body dynamics is an important tool for studying the dynamic behavior of complex mechanical system, which has developed in recent years. It establishes second order partial differential equations of characterization system dynamical behavior based on the principle of conservation of energy. It’s not easy for this kind of partial differential equations to obtain the analytical solution Therefore, numerical algorithm differential Quadrature method is utilized. Thin-walled plate theory is the theory which aims at the mechanical properties and characteristics of thin-walled structures of the objects and shows the internal deformation, the displacement as well as strain relationships of the thin-walled structures. Since the structure of the wind turbines studied in this paper is complex and special, its system dynamics modeling and analysis is required to base on the above theoretical methods. This paper briefly describes the related theoretical basis. What’s more, the load and characteristics of wind turbines are introduced. Simplifying The Load Of The Wind Turbine Combined with the operating environment of the wind turbine, the following loads can be seen in the process of the operation of the wind turbine: the wind resistance of the wind and the nacelle, the wind resistance of the tower, the nacelle weight of the wind turbine and its bending moment generated by mass eccentricity as well as the driving torque while working, shown as Figure1. The parameters in the figure are expressed as follows: (1) the horizontal thrust of the wind wheel 2 2 4 9 x F R v ρπ = (1) x F —the horizontal thrust of the wind wheel, unit: N ρ —the air density, unit: 3 kg/s R—the radius of the wind wheel unit: m v— the wind velocity, unit: m/s (2) the weight of the wind turbine and the nacelle G=mg m—The total mass of the rotor and the nacelle, unit: kg g— the acceleration of gravity, unit: 2 m/s 6th International Conference on Mechatronics, Materials, Biotechnology and Environment (ICMMBE 2016) © 2016. The authors Published by Atlantis Press 191 Fig 1. the force diagram of the wind turbine (3) q(z) the wind pressure along the height of the tower, unit: Pa (4) the bending moment generated by the thrust and the weight of the eccentric of the wind turbine nacelle 1 2 h x M F h Gh = + (2) h M —the bending moment generated by the thrust and the weight of the eccentric of the wind turbine nacelle 1 h —the height from the main wheelbase of the wind turbine tower to the tip 2 h —the eccentric distance of the wind turbine nacelle system quality relative to the tower axis (5) n M —the torque of the wind wheel generating electric power and the moment of the friction generated by driving systems. When combined with the above stress analysis, q(z) is ignored. When the wind turbine vibrates, the exciting force in X direction is 2 2 4 9 x F R v ρπ = . Excitation torque is: 1 2 h x M F h Gh = + . Since the conservative force does not affect the structure of the inherent characteristics of free vibration, 2 Gh can be ignored. Namely, the exciting moment can be seen as:

Research On The Inherent Characteristics Of The Wind Turbine Tower Based On DQM