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

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (18) : 60-66.

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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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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.

Key words

Ceramic hip endoprosthesis system / Squeaking / Complex eigenvalue extraction / Dynamic response

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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