doi: 10.3850/S201042862015001234

Experimental and Computational Investigation On Dynamic Characteristics
of Composite Nano Rotor

Bu Chen^a, Zhen Liu^b, Dong Yang^c and Bingfei Li^d State Key Laboratory for Strength and Vibration of Mechanical Structures,
School of Aerospace, Xi'an Jiaotong University, Xi'an, 710049, China ^abcbc425@stu.xjtu.edu.cn ^bliuz@mail.xjtu.edu.cn ^cyangdongy@stu.xjtu.edu.cn ^dm18729983662@163.com

ABSTRACT

Composite nano rotor is small, thin and flexible with large twist and high rotating speed, which induces complex dynamic characteristics. In this paper, an experimental method was developed to study the dynamic characteristics of such small, light and flexible composite rotor and computational study was carried out to investigate the influence of aerodynamic force, gravity, and centrifugal force on the dynamic characteristics of composite nano rotor. Mechanical parameters of composite material were firstly measured with tensile test. Successively, a non-contact modal experimental platform was established based on sound excitation instrument and laser vibrometer. Modal experiment of center-clamped nano rotor was then conducted and the finite element model of nano rotor was validated. Then the unsteady flow field of nano rotor was solved using large eddy simulation (LES) method with multi-block structured sliding mesh. Dynamic characteristics of nano rotor with aerodynamic load obtained were investigated using a unidirectional fluid-structure interpolating method. Meanwhile, the dynamic characteristics were also investigated by applying with gravity and centrifugal force, respectively. Results showed that each load enhanced natural frequencies of nano rotor due to prestress and centrifugal force had the biggest effects on them, especially on low-order frequencies. Finally, dynamic characteristics of nano rotor with all three loads were studied. It was found that the first two order natural frequencies had a significant increase of about 7.2% when comparing with non-prestressed case. It was evident the importance of considering the three forces while studying the dynamic characteristics of composite nano rotor, especially for centrifugal force.

Keywords: Composite Nano Rotor, Dynamic Characteristics, Non-contact Modal Experiment.

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