中文摘要：

微型旋转机械是MEMS（micro—electro—mechanical system）中的主要驱动之一，微转子作为系统的主要驱动部件，其动力学特性直接影响整个系统的稳定性和可靠性。文中以Jeffcott微转子系统为研究对象，建立微转子系统的碰摩力学模型和系动微分方程，应用现代非线性和转子动力学理论，以偏心量为分岔参数分析微转子碰摩时的振动响应与非线性动力特性，并以实验结果讨论偏心量对微转子系统动力特性的影响。

英文摘要：

Rotation micro-machinery is an important power MEMS（micro-electro-mechanical system） and micro-rotor is the main driving component of the system. Dynamic characteristics of the rotor affect the stability and reliability of the whole system directly. A general model of a Jeffcott micro-rotor system with rub-impact is established based on the classic impact theory and is analyzed by the modem nonlinear dynamics and rotordynamic theories. An investigation is carried out on the vibration responses and dynamic characteristics of the rotor system with rub-impact and the results provide a better understanding of the dynamical characteristics, such as the transition among periodic, quasi-periodic and chaotic responses. In addition, the experiment results are provided to discuss effects of eccentricity of the rotor on the whole system. The results help engineers to optimize the design of micro-rotating machinery in MEMS, as well as to develop sensitive monitoring/diagnosis systems assessing machinery conditions.