【摘要】：人體半規(guī)管是人體內(nèi)耳前庭系統(tǒng)中的重要組成部分,由三個半圓形小管構成,并且這三個半圓形小管相互垂直。人體半規(guī)管內(nèi)部和外部都充滿了淋巴液。當人體運動時,由于慣性,人體半規(guī)管內(nèi)部的淋巴液將會反方向流動。人體壺腹嵴在人體半規(guī)管底端的壺腹中,并且在其內(nèi)部有毛細胞,毛細胞包裹在明膠狀的物體中組成了人體壺腹嵴頂。人體半規(guī)管內(nèi)部淋巴液的移動將會導致壺腹嵴頂活動,激勵了毛細胞,如此人體半規(guī)管就能夠感應空間中每個方向的運動。本文針對人體半規(guī)管展開初步探索,模仿人體半規(guī)管對運動的感知原理,制備了人工壺腹嵴加速度傳感器,其主要研究內(nèi)容如下:(1)本文在制備成功的含金屬芯PVDF壓電纖維表面涂鍍對稱電極,極化后制備出表面對稱電極含金屬芯PVDF壓電纖維,即SMPF(Symmetric electrodes metal core PVDF fiber)來模仿人體毛細胞,本文用硅橡膠代替人體壺腹嵴中的膠狀物質(zhì)。(2)將硅橡膠和SMPF埋入自制模具中,制備出人工壺腹嵴加速度傳感器,將其一端固定在激振器上,一端自由,建立懸臂梁結(jié)構的人工壺腹嵴加速度傳感器在氣體中的振動傳感模型,推導其產(chǎn)生的振動傳感電荷與振幅、頻率之間的關系,以激光位移傳感器所采集的位移信號為參照。并搭建了實驗平臺,檢測了人工壺腹嵴加速度傳感器的振動傳感性能,實驗結(jié)果表明,人工壺腹嵴加速度傳感器能夠感知振幅大小,并且具備較高的靈敏度。(3)采用3D打印的方法打印出直線型人工半規(guī)管,并在直線型人工半規(guī)管中注滿液體,將人工壺腹嵴加速度傳感器一端固定在直線型人工半規(guī)管內(nèi)壁,另一端懸浮在液體中,呈懸臂梁結(jié)構,建立懸臂梁結(jié)構的人工壺腹嵴加速度傳感器在液體中的振動傳感模型。搭建實驗平臺,對人工壺腹嵴加速度傳感器在液體中的振動傳感性能進行了測試研究。(4)通過實驗研究表明,人工壺腹嵴加速度傳感器具有良好的振動傳感性能,且經(jīng)過掃頻實驗檢測到人工壺腹嵴加速度傳感器的固有頻率低于10Hz,在人體運動范圍內(nèi),可以用于人體頭部的運動檢測,在未來也可以用于人體前庭系統(tǒng)結(jié)構和功能的模型制作。
[Abstract]:Human semicircular canal is an important part of human inner ear vestibule system, which is composed of three semicircular tubules, and these three semicircular tubules are perpendicular to each other. The body's semicircular canal is filled with lymphoid fluid both inside and outside. When the body moves, due to inertia, the lymph inside the semicircular canal will flow in the opposite direction. The ampullary crest of the human body is in the ampulla of the bottom of the semicircular canal, and there are hair cells in it, which are wrapped in gelatin-shaped objects to form the top of the ampullary crest of the human body. The movement of lymphoid fluid in the semicircular canal of the human body will lead to the movement of the ampullary crest and stimulate the hair cells, so that the semicircular canal of the human body can sense the movement in every direction in space. In this paper, the artificial ampullary crest acceleration sensor was prepared by imitating the sensing principle of human semicircular canal to the motion of human semicircular canal. The main research contents are as follows: (1) in this paper, the surface symmetric electrode containing metal core PVDF piezoelectric fiber was prepared by coating symmetrical electrode on the surface of PVDF piezoelectric fiber with metal core, that is, SMPF (Symmetric electrodes metal core PVDF fiber) to mimic human hair cells. In this paper, silicone rubber is used instead of colloidal substance in human ampullary crest. (2) the artificial ampullary crest acceleration sensor is prepared by embedding silicone rubber and SMPF into the self-made mould. One end of the artificial ampullary crest acceleration sensor is fixed on the exciter and the other end is free. The vibration sensing model of the artificial ampullary crest acceleration sensor with cantilever structure in gas is established, and the relationship between the vibration sensing charge and amplitude and frequency is deduced. The displacement signal collected by laser displacement sensor is used as reference. The experimental platform is built to detect the vibration sensing performance of the artificial ampullary crest accelerometer. The experimental results show that the artificial ampulla acceleration sensor can sense the amplitude and has high sensitivity. (3) the linear artificial semicircular canal is printed out by 3D printing, and the linear artificial semicircular canal is filled with liquid. One end of the artificial ampullary crest acceleration sensor is fixed on the inner wall of the linear artificial semicircular canal and the other end is suspended in liquid. The vibration sensing model of the artificial ampullary crest acceleration sensor with cantilever structure in liquid is established. The vibration sensing performance of artificial ampullary crest acceleration sensor in liquid was tested and studied on the experimental platform. (4) the experimental results show that the artificial ampullary crest acceleration sensor has good vibration sensing performance, and the natural frequency of artificial ampullary crest acceleration sensor is less than 10Hz, which can be used to detect the head motion of human body in the range of human motion. In the future, it can also be used to model the structure and function of human vestibule system.
【學位授予單位】：揚州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP212
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本文編號：2503642