Vibration Characteristics Analysis Of Imitated Spinal Functional Composite Structure

The structure stimulated by External excitation can cause vibration which will greatly affect people's lives and even threaten the safety of people's lives and property.Scholars at home and abroad have long been devoting themselves to research on structural vibration reduction With the progress of society and the development of science,new vibration reduction technology has been applied in the field of engineering.In vibration control fo of structure,it has also been developed to include passive,active,semi-active,intelligent and hybrid Control and many other aspects of vibration control.As the central axis of the human body,the spine plays an important role in the physiological activities of the human body.Studies have shown that the spine plays a role in protecting,stabilizing and slowing down the impact of human activities.As an important part of the spine,intervertebral disc is the basis of spinal activity,and the viscoelastic property of its components is the decisive factor for the vibration reduction of the spine.In this paper,numerical simulation,experiments and theoretical calculations are used to study on the mechanical properties of the spine and its damping function.Based on the mechanical properties of the spine,its damping function is applied to the composite structure with the spinal function in the civil engineering to study the vibration characteristics of the structure.The main research contents are as follows:1.Based on CT scanning data,3D reconstruction of lumbar vertebrae is carried out and optimized,and then imported into finite element analysis software to carry out numerical simulation under static load.The mechanical properties of the lumbar spine of the human body under static load are obtained,and the intervertebral disc is the basis of the vertebral activity.Uniaxial compression experiments were carried out on the spinal functional segments,and the stress-strain curves were obtained.It validated the validity of the model and laid the foundation for the calculation of the viscoelastic constitutive model of the intervertebral disc under static load.2.The mechanical theoretical basis of viscoelastic materials and several classical calculation models of viscoelastic materials are described,and the stressrelaxation experiments of intervertebral discs have been carried out.Based on the mechanics theory of viscoelastic material,the viscoelastic constitutive model of the intervertebral disc is calculated,which is used as the viscoelastic constitutive relation of the intervertebral disc,and the dynamic response of the intervertebral disc under sinusoidal load is analyzed.The conclusion is that the viscoelastic properties of the intervertebral disc can reduce the maximum displacement of the spine nearly 40%,which has verified the vibration reduction function of the intervertebral disc side by side,and laid the foundation for the application of the vibration reduction function of the intervertebral disc to the civil engineering structure.3.The dynamic mechanical properties of viscoelastic materials and the influencing factors are described.The dynamic modulus and energy dissipation factor of viscoelastic material of intervertebral disc are calculated through the transformation relation between static relaxation modulus and dynamic relaxation modulus.It is used as a new kind of viscoelastic material in the civil engineering structure to form a composite beam with the function of the spine,and analyzes the vibration characteristics of the composite beam.