螺栓连接非线性振动特性研究.pdf

文档介绍：螺栓连接非线性振动特性研究*
陈学前,杜强,冯加权
(中国工程物理研究院总体工程研究所,四川,绵阳,621900)
摘要:在不同的外界激励下,螺栓连接常常表现出一定的非线性。为研究螺栓连接的非线性
特性,设计了一个螺栓连接系统,并对其进行不同基础激励下的正弦扫频实验。通过实验数
据的分析得到了螺栓连接的共振频率和相对阻尼系数,发现其随着激励量级的不同呈现出较
明显的非线性特性。在理论模型研究中,将系统简化为非线性弹簧、非线性阻尼器、质量块
的单自由度模型,并利用实验数据对非线性方程中的系数进行了识别。利用此非线性模型,
求出系统的主共振频率和相对阻尼系数,它们与实验结果相比差别较小,说明文中所给的非
线性方程能较好描述螺栓连接的振动特性。
关键词:螺栓连接;振动;非线性
中图分类号:O324 文献标识码:A

THE STUDY ON THE NONLINEAR VIBRATIONAL CHARACTERISTIC OF
BOLT-JOINTS
CHEN Xueqian,DU Qiang,FENG Jiaquan
(Institute of Systems Engineering, CAEP, Mianyang, Sichuan, 621900)

Abstract: Bolt joints are widely used in many structures, they represent some nonlinearity
subjected to different environment exciting generally. In order to study on their nonlinear
characteristic, a bolt-joints system is designed, and the sin-sweep vibration tests are done on the
system subjected to different base exciting. The resonant frequencies and the relative damping
coefficients of the bolt-joints system are obtained by analyzing the test data, they show obvious
nonlinear characteristic with the vibration level changing. In theory study, the system is simplified
to be a single freedom degree mass-spring-damper model with nonlinear spring and nonlinear
damper. The coefficients of the nonlinear equation are identified by the test data. Last, the main
resonant frequencies and the relative damping coeff