铸铁表面接触法向阻尼特性试验  

Damping Characteristics of Cast Iron Surface in Contact Normal

作　　者：王世军[1] 于雷[1] 孙夏思[1] 赵金娟[2] 黄玉美[1] 

机构地区：[1]西安理工大学机械与精密仪器学院,西安710048 [2]西安理工大学印刷与包装工程学院,西安710048

出　　处：《农业机械学报》2013年第12期321-325,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB724406);国家科技重大专项资助项目(2009ZX04014-032);西安理工大学科技创新计划资助项目(102-210916);西安理工大学博士启动基金资助项目(102-220411);陕西省教育厅科学研究计划资助项目(2013JK1026)

摘　　要：研究了铸铁磨削表面在法向载荷作用下的接触阻尼特性，得知采用复阻尼形式表达接触阻尼比用复刚度形式能更好地反映试验结果和规律。研究了简谐激励下法向接触压力与接触层变形的关系，提出用复阻尼方法建立接触层的稳态动力学方程。研究了法向预紧力、激振力幅值和激振频率对相位的影响。结果表明，在激振频率为0．25～128Hz，激振力幅值为22．7～296kPa，预紧力0．205～1．68MPa，变形滞后的相位在1．5°～55°之间变化。相位与预紧力保持线性关系，预紧力越大，相位越小。相位与激振频率的关系在频率比较高时大致呈线性关系，频率越高，相位越大。还得知相位与激振力幅值的关系曲线不是单调的，激振力幅值较小时相位存在一个最大值，即只有在激振力幅值合适时才会产生最大的接触阻尼。By means of experiments, the damping characteristics of the cast iron ground surfaces in contact normal was studied. It was found that the formulation of complex damping was a better representation of the test results and rules than the formulation of complex stiffness. Firstly, the relationship between contact pressure and deformation contact layer subjected to a harmonic excitation was studied and the complex damping method was used to establish the contact dynamic equation of steady state. The phase that normal contact deformation lags behind exciting force was used to reflect contact damping. Secondly, effect of normal pre-loaded pressure, amplitude of exciting force, and exciting frequency on the lagging phase were investigated. The results showed that the phase varies between 1.5°and 55 ° when pre-loaded pressure was from 0. 205 MPa to 1.68 MPa, and amplitude of exciting force was from 22.7 kPa to 296 kPa and exciting frequency was from 0.25 Hz to 128 Hz. The relationship between the phase and pre-load pressure was linear, and with pre-loaded pressure increased, the phase decreased. The relationship between the phase and exciting frequency was almost linear when exciting frequency was relatively high, and with frequency increased, the phase increased. It was also found that the relationship between the phase and amplitude of exciting force was non-monotonic. When the amplitude of exciting force was relatively small, the phase had a maximum value. In other words, only under modest amplitude of exciting force, the contact damping had a maximum value.

关 键 词：铸铁 表面接触 法向阻尼 试验 

分 类 号：O344.1[理学—固体力学] TG115.5[理学—力学]