Experimental Study on Acceleration Mobility Measurements for Rotor/Fuselage Coupled Model of Helicopter

The acceleration mobilities of rotor and fuselage subsystem and coupled system are key parameters for determining natural frequencies of the rotor/fuselage coupled system by using mobility matching method.We have deduced the analytical expressions.In order to verify the feasibilities of the expressions,it is necessary to measure those mobilities.But it is difficult to measure them because of the rotor rotation effects.Therefore,a model test,as an inltial step,is required.In this paper the test approaches and procedures for measuring the acceleration mobilities of rotor and fuselage subsystem and coupled system are introduced.The measured and calculated results for self designed rotor/fuselage model are summarized and compared.The results show that our test approaches and methods are feasible and analytical expressions are correct.