具有约束层阻尼旋转复合材料轴的动态特性研究

发布时间：2018-01-19 20:34

  本文关键词： 被动约束层阻尼 复合材料轴 转子系统 阻尼自由振动　出处：《振动与冲击》2017年07期 　论文类型：期刊论文

【摘要】：复合材料驱动轴在高速旋转下的振动抑制,是先进直升机和汽车传动系统结构设计需要考虑的重要问题。约束层阻尼技术是工程领域内普遍采用的实用有效的阻尼减振设计方法;然而通过采用约束层阻尼处置方式增加复合材料传动轴的阻尼能力的研究报道,目前国内外很少见到。从应力-应变关系、应变-位移关系出发,推导出复合材料Timoshenko轴、约束层与黏弹性层的动能及势能的数学表达式,采用Hamilton原理建立具有约束层阻尼的旋转复合材料轴的运动学方程。采用广义Galerkin法对动力学方程进行了离散化,建立了广义坐标表示的自由振动方程组,通过特征值求解得到系统的固有频率和阻尼比;基于比例阻尼假设和四阶Runge-Kutta数值积分方法求解上述方程,得到系统的自由振动响应曲线。通过数值分析揭示了约束层材料、黏弹性层材料、铺层方式、长径比和转速对具有约束层阻尼的旋转复合材料轴的固有振动特性以及自由振动响应特性的影响。
[Abstract]:Vibration suppression of composite drive shaft under high speed rotation. It is an important problem to be considered in the structural design of advanced helicopter and automobile transmission system. The damping technology of constrained layer is a practical and effective design method of damping vibration in engineering field. However, it is seldom seen at home and abroad to increase the damping capacity of composite transmission shaft by using the damping disposal method of constrained layer. The stress-strain relationship and strain-displacement relationship are considered. The mathematical expressions of kinetic energy and potential energy of composite Timoshenko axis, confinement layer and viscoelastic layer are derived. The kinematics equation of rotating composite axis with constrained layer damping is established by Hamilton principle, and the dynamic equation is discretized by generalized Galerkin method. The free vibration equations expressed by generalized coordinates are established and the natural frequency and damping ratio of the system are obtained by solving the eigenvalues. Based on the proportional damping assumption and the fourth-order Runge-Kutta numerical integration method, the free vibration response curve of the system is obtained, and the constrained layer material is revealed by numerical analysis. The effects of viscoelastic layer material, layering mode, aspect ratio and rotational speed on the natural vibration characteristics and free vibration response characteristics of rotating composite shaft with constrained layer damping.
【作者单位】： 山东科技大学机械电子工程学院;
【基金】：国家自然科学基金(11272190)
【分类号】：TB33
【正文快照】： 驱动轴是用于直升机和汽车动力传输系统中的一类重要的结构部件。与金属材料轴相比,复合材料由于具有重量轻、比强度和比刚度高等优点,因此,正在逐步取代金属材料,在现代航空和汽车驱动轴结构设计中获得越来越广泛的应用[1-5]。高性能飞机和汽车的研制对复合材料驱动轴在高速，

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