The conclusions are (1) The scale factor of frequency between large and small perspex model test accord with similitude law basically. The error of primary frequency is 2.7% or 4.1%, the error of the second frequency is 0 or 6.05%.

• 得到了以下结论:(1)大小模型频率符合相似律；一阶频率误差为2.；7%25、4