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ACC (air cooled condenser) is widely used in coal-fired power plants. It has the advantages of water saving and energy saving, and the system is simple. The fan bridge is an important part of the ACC. At present, the vibration problem of the fan bridge is very much, and the experimental data of the bridge vibration is single, and the fundamental vibration source problem is not revealed. Therefore, it is important to study the vibration causes of the wind turbine bridge. This paper analyzes the possible causes of vibration of the fan bridge. Through the combination of field test and theoretical analysis, the main causes of bridge vibration are analyzed. Research shows that air disturbance is the main cause of bridge vibration. The research results provide basis for bridge design.

Cross-rail is a key component of support structure of the machine, whose mechanical properties have direct impact on the accuracy and dynamic performance of the machine. This paper studied a bridge type milling composite extrusion CNC machine whose cross-rail welded together by a rib structure, therefore, well-designed rib structure is particularly necessary. In this paper, the finite element method for analyzing the cross-rails of four different rib structures, static deformation and natural frequency, and the deformation of impact on the process of start and stop in three performances are adopted to obtain better overall performance rib structure to meet the requirements of the mechanical properties of the machine. KEYWORD: Machine cross-rail, Finite element, Ribs, Static and dynamic characteristics