摘要
基于频率阻尼比法,提出了一种利用悬臂梁的平面结合面参数识别测试模型,采用有限元法建立了力学模型,通过模态试验优化识别出干摩擦和油脂润滑这2种不同介质状态下结合面的法向刚度系数和法向阻尼系数,并拟合出结合面动态参数随面压力的变化规律.研究结果表明,悬臂梁测试模型对于优化识别平面结合面的动态参数具有较高的精度,干摩擦和油脂润滑结合面的动态参数随面压力的变化不仅具有较强的非线性,而且油脂润滑结合面的动态参数值要比干摩擦的参数值大.
A test model of cantilever beam for dynamic parameters identification of the joint surfaces was proposed with the frequency and damping ratio method. The corresponding dynamic model was established by means of finite element method. The normal stiffness and damping coefficients of the joint surfaces under the condition of dry friction and oiled were identified in the mode test, and optimized to approach the exact values. The varying rules between the dynamic parameters of the joint surfaces and the interface suffered pressure were fit out. The research results indicate that the test model of cantilever beam is suitable for identifying the dynamic parameters of the joint surfaces. The varying rules of dynamic parameters along with the interface suffered pressure get highly nonlinear. The dynamic parameters of oiled interface are greater than that of the dry friction interface.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2008年第11期1323-1326,共4页
Journal of Xi'an Jiaotong University
基金
国家重点基础研究发展规划资助项目(2007CB707706)
关键词
结合面
悬臂梁
参数识别
动态参数
joint surface
cantilever beam
parameter identification
dynamic parameters
