陶瓷髋关节异响产生机理的数值模拟研究

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (18) : 60-66.

论文

陶瓷髋关节异响产生机理的数值模拟研究

范娜 , 陈光雄

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Numerical Study of the Generation Mechanism for Squeaking of Ceramic-on-ceramic Hip Prosthesis

FAN Na , CHEN Guang-xiong

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摘要

建立了陶瓷髋关节假体的有限元模型，分析了假体系统的振动特性，并利用复特征值提取法研究了假体系统在摩擦作用下的动态响应，深入揭示了陶瓷髋关节异响的产生机理。计算结果表明，髋臼组件的固有频率远高于异响频率而股骨组件的固有频率非常接近异响频率，它与异响有重要关系。考虑摩擦激励后，股骨组件在不稳定模态频率1843Hz～2050Hz的扭转振动以及在3300Hz左右的弯曲振动是陶瓷髋关节假体系统自激振动的振源，是异响产生的根本原因。最后，建议通过改变股骨组件中假体柄的结构来提高股骨组件抗扭转和弯曲振动的能力，以提高系统的振动稳定性从而抑制关节异响。

Abstract

A finite element model of the ceramic hip endoprosthesis system is established using ABAQUS 6.7. The generation mechanism for squeaking of ceramic hip endoprosthesis system has been revealed according to a analysis of the vibration performance of the system, as well as a dynamic response analyses of the system under friction coupling by the complex eigenvalue method. Numerical results show that nature frequencies of acetabular components are much higher than the frequencies of squeaking while the nature frequencies of femoral components are close to the frequencies of squeaking. It suggests that the vibration of femoral components is of great importance in the generation of squeaking. After taking into consideration the friction coupling, the femoral components represents a torsional vibration at unstable frequency 1843Hz～2050Hz and represents a flexural vibration around the unstable frequency 3300Hz. Both are found to be the sources of the selt-excited vibration of a ceramic hip endoprosthesis system and responsible for squeaking. Finally, it is suggested to modify the structure of the stem to improve the capacity to resist the torsional vibration and flexural vibration of the femoral components so as to improve the vibrant stability of a ceramic hip endoprosthesis system and suppress the squeaking.

导出引用

范娜; 陈光雄. 陶瓷髋关节异响产生机理的数值模拟研究[J]. 振动与冲击, 2012, 31(18): 60-66

FAN Na;CHEN Guang-xiong. Numerical Study of the Generation Mechanism for Squeaking of Ceramic-on-ceramic Hip Prosthesis [J]. Journal of Vibration and Shock, 2012, 31(18): 60-66