Research On Bionic Damping System Based On Acoustic Conduction Mechanism Of Middle Ear Ossicular Chain

The vibration isolation system achieves the function of suppressing the transmission of dynamic mechanical vibration through the internal spring-damping element.The study found that the human ear ossicular chain sound transmission system has fast sound transmission speed,strong adaptive amplitude adjustment amplitude,complex control system,strong sensitivity to low frequency sound source signals,high frequency vibration energy is easy to decay,and the sound transmission function is almost non-aged.The ossicular chain system under the control of joint structure,muscle and ligament tissue,combined with the inner ear lymph and brain regulation,has the function of automatically adjusting the amplitude of the vibration of three small pieces of small bone according to the audio frequency.In view of the natural sound transmission characteristics of the ossicular chain,this paper designs a new type of vibration isolation system by simulating the mechanism of ossicular chain acoustic conduction.The main research contents of the thesis include:(1)According to the characteristics of the vocal chain,the ossicular chain model was established based on the morphological parameters of the human ear using 3D modeling software.The virtual middle ear sound transmission system is established in the virtual working prototype.The responsiveness and motion amplitude of the three small bones of the ossicular chain system are used as the evaluation basis.The damping,elastic coefficient and bone joint of the ligament around the small bone system are determined.The characteristics of the movement and the material properties of the muscle tissue were finally analyzed by ADAMS-MATLAB co-simulation to analyze the frequency characteristics of the ossicular chain motion amplitude.(2)Based on the acoustic transmission mechanism of the ossicular chain,the ossicular chain vibration isolation system based on the middle ear sound transmission mechanism was designed,and the virtual working environment of the vibration isolation system was established to analyze the frequency characteristics of the vibration isolation system.Then the vibration isolation system was made and the installation of each component was completed.By setting up the vibration isolation system test bench,the relationship between energy attenuation,low-pass filtering,frequency characteristics and natural frequency of the vibration isolation system,and the influence of the load on the frequency characteristics of the vibration isolator are discussed.(3)A dynamics model is established for the vibration isolation system,and a dynamic differential equation is established.The improved genetic optimization algorithm is used to obtain the relevant parameters of the system.The fourth-order Runge-Kutta is used to solve the motion amplitude ratio of the vibration isolation system at different frequencies.The theoretical calculation and the actual measured data are used to verify the rationality of the dynamic model,which provides theoretical guidance for the subsequent research.(4)Based on the ADAMS/INSIGHT sensitivity analysis module,the sensitivity of the tibia acceleration amplitude relative to the elastic element system inside the ossicular chain was studied.The error between the simulation result and the actual work was analyzed,and the simulation result was determined.This study can provide a basis for the subsequent development of the isolator.