Abstract: To study the influence of geometry parameters to mode performance and mass of pipes, taking a section of pipeline of an outdoor unit as research object and creating geometry parameters of the shape of pipes, according to response surface DOE analysis and sensitivity analysis, the influence of geometric parameters to modal performance and mass are studied in order to find which parameters have high efficiency to optimize its modal frequency, at last, the effectiveness of this method was proved by test of whole system.

Key words: Air conditioner, Pipeline system, Parameter optimization, Modal analysis, Sensitivity