| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 99 === ABSTRACT
The aim of this thesis is to verify the design of the structure of the axial-flow fan by simulating and analyzing its structure strength, and then to obtain the final optimal structure design. When we design a fan, we need to consider the volume, stress, frequency, efficiency and noise problem. The problem of vibration and noise occurs when the fan rotates at high speed. To solve this problem, we make an analysis on the structure of fan to see how it can avoid the impact from the vibration at high speed rotation. The fan we choose to test is with 60 x 15 cm frame, and it is with plastic material PBT+ 30% GF. The size and the material are very important, which is the key point to improve the fan structure. We use ANSYS software to study the relationship of structure, material and mesh. Fan cooling is a main method for radiation, but its vibration at high speed rotation often makes some bad influence on whole machine system. For example: when the structure has little damage, even small vibration will cause resonance and destroy the whole structure. In most cases, the style and structure of a fan is fixed after primary design. Its natural frequency won’t changes unless it is redesigned. So, we can only either expect to change the original design to avoid resonant frequency or make vibration smaller, or change the rotation speed to obtain a more stable fan structure.
|
|---|
