Design And Preparation Of Cochlear Magnification Model And Research On Vibration Sensing Characteristics

The cochlea is an important part of the ear in the human body.It is mainly composed of the central worm shaft and the surrounding bone volute canal.The basement membrane in the volute can be distributed with sensory cilia.The external signals are caused by the auricle,ear canal,ossicular chain and other transmission systems.The auditory center that senses that the cilia are deformed to generate nerve impulses and transmits them to the cerebral cortex is eventually interpreted as sound.Due to physiological and structural reasons,there is currently no in-depth understanding of the perception mechanism of the human cochlea.In this subject,a half-electrode piezoelectric fiber with metal core made of PVDF is used as the sensory fiber of the cochlear amplification model.The cochlear sensor model is designed and prepared to explore its sensory characteristics for vibration signals.The main research contents are as follows:1.Designed and prepared SMPF(Symmetric Metal core PVDF Fiber)bionic cilia sensor,and deduced the relationship between the charge generated by SMPF and the magnitude of excitation.Through experimental demonstration,it is known that SMPF can perceive the type,frequency and amplitude of vibration signals,and the magnitude of the response signal is linearly related to the amplitude of the vibration signal.2.Use SMPF instead of cochlear sensory cilia,use AB silica gel to simulate the cochlear membrane labyrinth,imitate the structure of the human cochlea,and enlarge it to a certain proportion to prepare an artificial cylindrical straight tube cochlear model.Build an experimental platform and use the vibration signal to vibrate the cylindrical straight tube cochlea.The experimental results show that the prepared cylindrical straight-tube cochlea has a perception effect on the type of vibration signal and the cochlear response signal has a linear relationship with the amplitude of the vibration signal.3.Design and prepare a single sensory fiber cochlear model of the cone tube,shock and vibrate it with the same vibration signal as in 2,and compare the difference with the response signal of the cylindrical straight tube cochlea.The experimental results show that the vibration at the same amplitude and the same frequency Under signal stimulation,the signal response of the cone tube cochlea is weaker than that of the straight tube cochlea,indicating that the cone tube cochlear structure has a signal attenuation effect.4.On the basis of 3,design and prepare three cochlear sensory fiber cochlear models,and use three sine,square wave,and triangle vibration signals to shock and vibrate them.Compare the signal size of the three fibers and process the analysis.The results show that from From the bottom of the worm to the top of the worm,the frequency of the maximum response signal of the fiber gradually decreases,indicating that the conical cochlear structure has a selective effect on signals of different frequencies,which is consistent with the law of the traveling wave theory.Through the establishment of the experimental models of the cylindrical straight tube cochlea and the cone tube cochlea and the experimental analysis,it is concluded that the prepared cochlear amplification model has the ability to perceive the type,amplitude and frequency of the vibration signal and the response signal size has a linear relationship with the excitation signal amplitude;Contrastive analysis of the experimental data of the single sensory fiber cochlear model of the cone tube and the cylindrical straight tube cochlear model shows that the signal response of the latter is more obvious for the same vibration signal,indicating that the cone tube cochlear model has an attenuation effect on the signal;The comparison of the signals of three fibers in the three sensory fiber cochlear models of the cone tube shows that the cone tube cochlear structure has a frequency-selective effect on the vibration signal,and the traveling wave theory is verified.The research results in this paper have verified some traditional theories of the human cochlear sensing mechanism,and can provide some reference for the examination and treatment of related diseases in the field of vestibular science.