航空学报 > 2015, Vol. 36 Issue (6): 1905-1914   doi: 10.7527/S1000-6893.2014.0321

直升机旋翼黏弹阻尼器时域动力学建模与分析

李锐锐, 虞志浩, 杨卫东, 武珅   

  1. 南京航空航天大学 直升机旋翼动力学国家重点实验室, 南京 210016
  • 收稿日期:2014-07-18 修回日期:2014-10-15 出版日期:2015-06-15 发布日期:2014-12-01
  • 通讯作者: 虞志浩 Tel.: 025-84891805 E-mail: zhihao@nuaa.edu.cn E-mail:zhihao@nuaa.edu.cn
  • 作者简介:李锐锐 男, 博士研究生。主要研究方向: 直升机旋翼动力学, 黏弹阻尼器技术。 Tel: 025-84891805 Email: llyy3xx@gmail.com;虞志浩 男, 博士, 讲师。主要研究方向: 旋翼气动弹性力学, 旋翼系统多体动力学。 Tel: 025-84891805 Email: zhihao@nuaa.edu.cn;杨卫东 男, 博士, 教授, 博士生导师。主要研究方向: 旋翼动力学, 旋翼动载荷分析, 智能旋翼技术。 Tel: 025-84892455 Email: ywdae@nuaa.edu.cn;武珅 男, 博士研究生。主要研究方向: 直升机旋翼动力学。 Tel: 025-84891805 Email: wshaha1983@163.com
  • 基金资助:

    国家自然科学基金 (11272148); 江苏高校优势学科建设工程资助项目

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

LI Ruirui, YU Zhihao, YANG Weidong, WU Shen   

  1. National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2014-07-18 Revised:2014-10-15 Online:2015-06-15 Published:2014-12-01
  • Supported by:

    National Natural Science Foundation of China (11272148); A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions

摘要:

建立一种适用于旋翼气动弹性分析的黏弹阻尼器模型,该模型考虑了黏弹材料本身的刚度非线性及激振力频率和幅值对黏弹阻尼器应力-应变关系的影响。通过引入新型几何非线性弹簧模块,根据需要调整模型的刚度变化规律,避免了现有黏弹阻尼器模型模拟不同类型材料时因刚度变化规律差异而需重新建模的缺陷,模型适应性强。模型采用多个内变量场,既能体现阻尼器幅变特性,也能准确反映多频激励下的黏弹性特性。以两种不同类型黏弹材料制造的黏弹阻尼器为研究对象,在旋翼黏弹阻尼器的典型工作幅值和频率范围内,进行了简谐实验。利用建立的旋翼黏弹阻尼器非线性时域动力学模型,计算不同类型黏弹材料制造的阻尼器在多种应变幅值、频率下的动态特性并与实验相比较,分析了黏弹阻尼器损耗模量、储能模量频变特性和双频激励对阻尼器的影响。结果表明,建立的非线性黏弹阻尼器动力学模型能够更好地反映不同类型黏弹材料构成的黏弹阻尼器的动刚度和阻尼,适合于直升机旋翼载荷计算和气动弹性分析。

关键词: 旋翼, 动力学, 阻尼器, 黏弹材料, 非线性

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

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