چكيده به لاتين
Modal analysis is a method used in engineering to test the condition of structures, such as towers and aircraft. The main idea of modal analysis is that the existance of any structural damage changes the properties such as stiffness, mass and energy damping properties of a system, which in changes the dynamic response of the system. On the other hand, damage to the spinal structure, which leads to spinal deformity and low back pain, can be detected by a change in stiffness. Because modal analysis is a non-destructive test and requires small forces and limited deformation to detect changes in mechanical properties, it can be a promising technique for studying spinal mechanics.
The purpose of this study is to study the modal analysis method to achieve the properties of the intervertebral disc. An ovine spine sample was used for the practical experiment. Finite element modeling of the sample was performed by Abacus software and natural frequencies and frequency function response diagrams were extracted from the model. Then, to estimate the properties of the intervertebral disk, the model was updated by isight software. Genetic algorithm has been used for the update process. Also, the intervertebral disc damping ratio was obtained by updating the model using FRF diagrams.
