Abstract: Vibration could not only induce structural noise, but only determine the reliability of products. Particularly, abnormal vibration would influent UE. There is one T-shape range hood which is with serious vibration problem. The vibration of it is more than 150 micrometer which cannot meet the quality standard. This purpose of this research is to solve the vibration problem of this range hood by the method of modal analysis. Modal analysis can figure out the range hood parts which cause the abnormal vibration. Optimization would be done due to the Modal shapes and methods of solutions would be made. Verification of the final solutions will be implemented by combination of vibration frequency analysis and vibration tests.

Key words: Frequency response function, Modal analysis, Vibration