Research On Test Bench Designing And Dynamic Balance Technique Of Micro Rotor

Nowadays, flexible rotor structure is widely used in aero-engine. The balancing progress of flexible rotor is always hard and low efficient, so it's of great value to research flexible rotor dynamic balancing. Rotor system of some micro-turbine engine is researched in this paper, and the main study works are following:(1)This paper introduces the tow balancing methods of flexible rotor: modal balancing method and influence coefficient method, the latter is emphasis of research. Least square influence coefficient method is improved in this paper, and weighted least square method and restrained adjust mass least square method are put forward. Correlation planes may lead to failure of balancing work and singular value decomposition method is put forward for to limit the influence of correlation planes.(2)Unbalance signal in dynamic balancing usually contains much noise, which reduces measurement precision obviously. Harmonic wavelet is applied to extract unbalance signal from background noise in this paper,and the experiment shows that harmonic wavelet is useful in dynamic balancing.(3)Modal of the micro-turbine engine rotor system is established. Transfer matrix method is applied to analysis dynamic characteristics of the rotor, and the main test parameters are determined. Measurement system and functions of components are analysis in this paper, and balancing precision is determined according to national standard. In the end, flexible rotor balancing experiment is finished on ZT-3 rotor vibration simulation test-bed, and the validity of least square influence coefficient method and its tow improved methods are verified.