Draught fan structure design method

Abstract

The invention discloses a draught fan structure design method. The method comprises the following steps of: aiming at each component of a draught fan structure, extracting a specific-order modal according to vibration characteristics of the component and a modal analysis method so as to obtain a sensitive area of the component; applying stimulation on the sensitive area, analyzing a harmonic response curve to obtain the shape a specific position, to be strengthened or adjusted, of the structure, and finally optimizing the draught fan structure through industrial design. The method is simple and high in operability, and has the effects of avoiding the occurrence of resonance phenomena and improving the service life of each component through improving the rigidity distribution of the components.

Description

technical field [0001] The invention relates to a method for designing a fan structure, which belongs to the field of industrial design of electrical machinery structures. Background technique [0002] The vibration characteristics of the fan of the main transformer has always been a concern of researchers. During the high-speed operation of the fan, the irregularity of the track and the change of the running speed of the train cause random vibration of the car body. After the car body transmits the vibration energy to the air duct of the main transformer, the frequency spectrum of the vertical acceleration excitation frequency is relatively wide. The main transformer The air duct is subjected to vertical acceleration loads with different excitation frequencies during use. Whether the excitation frequency of the vertical acceleration is similar to or the same as the natural frequency of the main transformer air duct will cause the main transformer air duct to resonate and ge...

AI Technical Summary

Problems solved by technology

During the high-speed operation of the fan, the irregularity of the track and the change of the running speed of the train cause random vibration of the car body. After the car body transmits the vibration energy to the air duct of the main transformer, the frequency spectrum of the vertical acceleration excitation frequency is relatively wide. The main transformer The air duct is subjected to vertical acceleration loads with different excitation frequencies during use. Whether the excitation frequency of the vertical acceleration is similar to or the same as the natural frequency of the main transformer air duct will cause the main transformer air duct to resonate and generate excessive stress. It causes local cracks in the air duct and further expands to cause fractures. There are still few researches in this area at home and abroad.