An Investigation on Dynamic Characteristics of a Human Leg Bone

• Main Authors: Liang, Shu-hao, 梁書豪
• Other Authors: 黃柏文
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/67650744047475301375

碩士 === 正修科技大學 === 機電工程研究所 === 99 === Human life is gradually increasing due to fast improvement of medical science. Knee joint degeneracy can be considered as an invisible killer in this modern aging society. Knee joint cartilage degenerated arthritis is the most popular disease among aged people. It will cause damage to the meniscus, insufficient lubrication, and even rub of femur condyle against platform of the tibia. The patient will feel painful during walking and can not move for severe situation. This study is focused on the dynamic analysis of the major components of the leg bones, including femur, tibia, and fibula, etc. The main theme of this research is to obtain the geometry of the synthesis leg bones (made by plastic material) from a teaching human skeleton by using four axes Laser Scanner to employ the reverse engineering. Then, import this geometry into finite element (FE) package, ANSYS, to build up a femur model, mesh, analyze the plastic femur model. The simulation results are compared to the experimental data to make sure the model is correct and acceptable. Finally, the mechanical properties of a real human femur will be input to the ANSYS program to derive the dynamic characteristic of real human femur. Both free and forced (impulse) vibrations are studied to obtain the frequency spectrum and time domain displacement response. The results show that the error of the natural frequency between finite element (FE) model and the experimental data are quite acceptable. Hence the FE model of the synthesis leg bones can be used to analyze real human leg bones. All the fundamental natural frequencies, mode shapes, and time response of the impact force at several different end points of the bones are obtained and analyzed. All these results can be provided to knee joint researcher and medical care personnel for reference.