Response Characteristics Analysis Of Human Spine Under Road Excitation

With the people’s living standards improving and incomes increasing, the car has become one of the basic necessities of the family. But with the popularity of cars, auto safety and comfort problems attract more and more people’s attention. In addition to collision the intuitive enormous damage for the human body, the vibration is another recessive reason that can cause harm to human body. Human cardiovascular, digestive, nervous, spinal and other organizations will be affected by vibrations, Human cardiovascular, digestive, nervous, spinal and other organizations will be affected by vibrations. In the vehicle-related diseases, the low back pain of drivers of long time suffering the vehicle vibrating is the most obvious, accounting for 57%-82%. The driver’s chances of suffering from back pain 2-3 times higher than the average person, which of tracked vehicle and heavy construction vehicle even up to 80%. Hence the human spine biomechanics research during the process of vehicle driving is imperative. For this reason, I have established a model T12-Pelvis spine segments and have done the model verification, the static analysis and the dynamic analysis. So I get some results and analysis of the biomechanical properties of the spine which explain some pathology of the spine disease and provide some theoretical reference to the designers in the comfort and safety of the vehicle design.Firstly, by CT tomography, get CT scan images of an healthy women. Then the images are imported into Mimics to extraction. Extracting the model of T12-Pelvis spine segment. Then import the model into ANSYS to add disc, sacroiliac joint cartilage and pubic symphysis to complete the mode. The last establish the ligaments fixing on the model. The complete model of T12-Pelvis segment completed. And finish the finite element mesh.Secondly, the whole model of T12-Pelvis model is split into sections, including the T12-L1, L1-L2, L2-L3, L3-L4, L4-L5, L5-S1, S1-Pelvis parts. Then conduct some simulation by these parts including vertical compression, lateral bending, torsion, flexion, extension static simulation. The results getting in the simulations will be compared with the results getting from the outstanding published papers to illustrate the effectiveness and rationality of the model. Get preparation for the static and dynamic analysis.Thirdly I make static analysis of the whole model of T12-Pelvis. The analytical content for drivers is the sitting posture in the driving process, including vertical posture, bending posture, forward sitting posture and torsion sitting posture, to obtain driver’s spine biomechanical characteristics from these sittings. Make research and analysis of the spine biomechanical characteristics to provide a theoretical reference for the human spine comfort and safety.Finally, make dynamic analysis of the whole T12-Pelvis. The kinetic analysis includes modal analysis, harmonic analysis, and vehicle random vibration analysis. In modal analysis, our main aim is to obtain the vibration mode and the vibration resonant frequency of the whole T12-Pelvis, in order to make appropriate protective measures. Harmonic analysis is intended to explore the change results of biomechanical properties of the spine with frequency in a relatively large frequency range which I can find out the frequency range that need to be prevented. Vehicle random vibration analysis is built on pavement roughness which is the motivation to the kinetic analysis of spine. So I can get the frequency sensitive range to the vehicle random vibration in the process of driving, so well in advance take measures to avoid the sensitive frequency range.