摘要
建立陶瓷髋关节假体系统有限元模型,采用ABAQUS复特征值分析法对陶瓷髋关节假体系统可能出现的摩擦噪声问题进行分析,并探讨了系统参数和振动噪声之间的关系。研究结果表明,髋臼子系统和球头子系统均有可能是摩擦噪声的主要声源。摩擦因数增大导致髋关节系统发生模态耦合,从而增强系统的振动强度和噪声产生倾向。髋关节系统摩擦噪声主要出现在其绕X轴和Y轴转动,但是两种状态产生振动的振型模态有所区别。通过对速度和系统摩擦振动噪声的关系研究后发现,髋关节异响问题往往出现在速度较低的时候,当速度大于一定临界值时,系统保持稳定。此外,当载荷越大时,摩擦界面形成应力集中和能量堆积,导致系统产生更多频率的不稳定振动,且振动强度和倾向增大。合理地选择球头直径,对改善髋关节摩擦噪声有积极的效果。文中当球头直径为36 mm时髋关节系统处于稳定状态,没有摩擦振动噪声产生。另外,通过降低股骨柄弹性模量,使其等于股骨弹性模量后,能够显著改善系统振动噪声倾向,降低振动强度,这对改善摩擦噪声问题有积极作用。
In this article,the finite element model of the ceramic hip endoprosthesis system is set up,and the problems related to friction noise are explored.The ABAQUS complex eigenvalue analysis is conducted to explore the vibration characteristics of the ceramic hip endoprosthesis system,and the relationship between system parameters and vibration noise is identified.The results show that both the acetabular subsystem and the ball subsystem may be the source of friction noise.The rise of friction coefficient may lead to the model coupling of the hip endoprosthesis system,which will increase the vibration intensity and the tendency of noise generation.Friction noise mainly occurs when the system rotates around the X-axis and Y-axis,but the vibration modes generated by the two situations are different.Moreover,the research shows that friction noise is often identified when the velocity is low,and the system will keep stable when the velocity is greater than a certain critical value.When load is larger,the friction interface with stress concentration and energy accumulation will result in larger intensity of vibration and more frequency of unstable vibration.The reasonable choice of ball head diameter has a positive effect on reducing the hip endoprosthesis system’s friction noise.It is found that when the ball head diameter is 36 mm,the system keeps stable without any fictionand-vibration noise.In addition,with the elastic modulus of the femoral shaft is reduced to the value of femoral elastic modulus,both the vibration intensity and the tendency of noise generation are significantly improved,which ensures a lower standard of friction noise.
作者
王志伟
张杨
刘跃昆
WANG Zhi-wei;ZHANG Yang;LIU Yue-kun(School of Mechanical Engineering,Yellow River Conservancy Technical Institute,Kaifeng 475004;Chongqing Automotive Power System Testing Engineering Technology Research Center,Chongqing 401120)
出处
《机械设计》
CSCD
北大核心
2020年第3期113-120,共8页
Journal of Machine Design
基金
重庆市教育委员会科学技术研究计划资助项目(KJZD-K201803201).
关键词
陶瓷髋关节
摩擦噪声
振动
复特征值分析
ceramic hip endoprosthesis
friction noise
vibration
complex eigenvalue analysis
