直升机旋翼黏弹阻尼器时域动力学建模与分析

doi:10.7527/S1000-6893.2014.0321

Abstract

Abstract:

A new constitutive model of elastomer damper is presented; the model is able to capture the strain-stress relationship of the helicopter rotor elastomeric damper, which is highly influenced by the excitation frequency, amplitude and the nonlinear stiffness of the elastomeric material. This model has combined with the nonlinear spring model and the variation law of stiffness can be modified, therefore, this model can reflect various variation law of stiffness of different materials by one model and the generality is improved. Multi internal variables field is used to have better frequency and amplitude dependence. Two elastomeric dampers made of two different types of elastomers are investigated through extensive tests of amplitudes and frequencies within typical working condition of rotor elastomeric damper. Based on this model, an elastomeric damper model is developed, different kinds of elastomeric damper's dynamic properties at different frequencies, strain amplitudes and dual-frequency have been calculated and compared with the experimental data. It is shown that the presented model can predict the dynamic stiffness and damping of the elastomeric damper made from different types of elastomers with few relative errors. Therefore, the presented method can be used for helicopter rotor load calculation and aeroelastic analysis.

Key words: rotor, dynamics, damper, elastomeric material, nonlinearity

CLC Number:

V215.3⁺5

LI Ruirui, YU Zhihao, YANG Weidong, WU Shen. A time-domain computational method for dynamic properties and analysis of helicopter rotor elastomeric damper[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(6): 1905-1914.

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A time-domain computational method for dynamic properties and analysis of helicopter rotor elastomeric damper

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