Abstrac--The method of experimental modal parameters
identification using the complex modal theories is brought
forward to analyze the dynamic parameters of the rotary
compressor in order to reduce the noise of household
electrical products. The compressor shell and the
liquid-tank shell could also be dynamic modified so as to
keep the compressor in lower noise by these parameters and
the result of sound signal analysis in working condition. And
the feasibility and efficient of the kind of dynamic modified
aiming at lower noise are studied. The experiment indicates
that the modified structure has higher damping. The noise
degree has been reduced so as to achieve the target of
household air conditioner.