初压力控制式圆窗激振压电作动器设计与优化  

Design and optimization of a preload controlled round-window stimulating piezoelectric actuator

作　　者：刘后广[1] 寇寅欣 王杰[2,3,4] 饶柱石[5] 曹国华 Liu Houguang;Kou Yinxin;Wang Jie;Rao Zhushi;Cao Guohua(School of Mechatronic Engineering,China University of Mining and Technology,Xuzhou 221116,China;Department of Otolaryngology-Head and Neck Surgery,Beijing Tongren Hospital,Capital Medical University,Beijing 100730,China;Key Laboratory of Otolaryngology-Head and Neck Surgery,Ministry of Education,Capital Medical University,Beijing 100730,China;Beijing Engineering Research Center of Audiology Technology,Beijing 100730,China;Institute of Vibration Shock&Noise,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]中国矿业大学机电工程学院,徐州221116 [2]首都医科大学附属北京同仁医院耳鼻咽喉头颈外科,北京100730 [3]首都医科大学耳鼻咽喉头颈科学教育部重点实验室,北京100730 [4]北京市人工听觉工程技术研究中心,北京100730 [5]上海交通大学振动、冲击、噪声研究所,上海200240

出　　处：《仪器仪表学报》2023年第10期156-166,共11页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(52275296,52111530235);江苏高校优势学科建设工程资助项目(PAPD)资助。

摘　　要：针对临床上所用的圆窗激振人工中耳不是针对该激振方式设计,存在术后补偿性能个体差异大、性能不稳定、增益值达不到理论值的问题,设计了一款作动端与圆窗膜尺寸匹配、初始压力可控的圆窗激振压电作动器。首先,结合人耳解剖结构,设计了作动器的机械组成结构及宏观尺寸;其次,对弯张放大器进行受力分析,采用粒子群算法对弯张放大器进行优化设计,以获得最优输出位移放大倍数;再次,构建了压电作动器-人耳耦合力学模型,分析了支撑弹簧横截面积与压电叠堆层数对作动器听损补偿性能的影响,确定了该设计参数;最后,根据确定的设计尺寸制造了压电作动器样机,搭建了激光测振试验台,对压电作动器的动态特性进行了测试。试验结果表明,所设计的圆窗激振式压电作动器作用在圆窗膜上的初始压力可控,且具有工作频带宽(100~10000 Hz)、谐波失真低(THD≤0.29%)的优点。该压电作动器适用于圆窗激振的听力损伤补偿,为混合性听力损伤的临床治疗提供一种新的方案。The clinically used middle-ear implant for round-window stimulation is not designed specifically for this excitation method,and there are problems such as large individual differences in postoperative performance,unstable performance,and gain value that cannot reach the theoretical value.To address these issues,a round-window stimulating type piezoelectric actuator that matches the size of the round-window membrane and can monitor the preload acting on the round-window membrane is designed.Firstly,combined with the anatomical structure of the human ear,the mechanical structure and macroscopic dimensions of the actuator are designed.Then,the force analysis of the flextensional amplifier is carried out,and the particle swarm algorithm is used to optimize the design of the flextensional amplifier to obtain the optimal output displacement magnification.After that,a piezoelectric actuator-human ear coupling mechanics model is formulated,the influence of the cross-sectional area of the support spring and the number of piezoelectric stack layers on the performance of the actuator′s hearing loss compensation is analyzed,and the cross-sectional area of the support spring and the number of piezoelectric stack layers are ascertained.Finally,the prototype of the piezoelectric actuator is manufactured according to the determined design size.A laser vibration test bench is established to test the dynamic characteristics of the piezoelectric actuator.The experimental results show that the designed round-window stimulating type piezoelectric actuator can monitor the preload acting on the round-window membrane.It has the advantages of wide operating frequency band(100~10000 Hz)and low harmonic distortion(THD≤0.29%).The designed piezoelectric actuator is suitable for the hearing loss compensation of the round-window stimulation,which provides a new solution for the clinical treatment of mixed hearing loss.

关 键 词：人工中耳 圆窗激振 压电作动器 优化设计 听损补偿 

分 类 号：TH789[机械工程—仪器科学与技术]