According to the mechanism and spectrum characteristics of an oil-free air compressor noise source, determined the muffler installed at the air inlet. According to the characteristics of noise source, muffler is designed into type of expansion chamber, considering the structural dynamic parameters, by means of optimization method to determine the size, and the finite element modal analysis is conducted. By solving the muffler's inherent frequency and mode of vibration, knows weather each order natural frequency is away from the peak frequency, the structural dynamics of the muffler can be modification. Methods of structure modal analysis and dynamic optimization on the muffler provided reliable reference to design a high efficient new muffler.

This article make the typical station HZS240 steel structure as the research object, according to the design parameters of the main building of steel structure, build a structural mechanics, carried the dynamic characteristics of the finite element modal analysis on the concrete batch plant used advanced analysis software, obtained the structure of each order natural frequency and vibration mode features. Through the natural frequency and vibration mode, we understand the dynamic characteristics of structure as a whole. Provide a reliable reference to design a security, economic, reasonable structure of the main building steel structure.