超声谐振式盲文点显胞元的挤压膜建模及实验研究  

Modeling and experiment of ultrasonic resonant Braille display cell’s squeeze film

作　　者：赵琪啸 李国平[1] 韩凯 项四通 魏燕定[2] 娄军强[1,2] ZHAO Qi-xiao;LI Guo-ping;HAN Kai;XIANG Si-tong;WEI Yan-ding;LOU Jun-qiang(Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,China;Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]浙江大学浙江省先进制造技术重点研究实验室,浙江杭州310027

出　　处：《振动工程学报》2024年第2期218-225,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51975517,52075273,51805276);浙江省自然科学基金公益项目(LGF21E050002);浙江省省属高校基本科研业务费专项资金资助项目(SJLY2021014)。

摘　　要：目前传统的盲文书籍已经难以满足盲人的阅读需求,本文基于超声振动产生的挤压膜提出了一种超声谐振式盲文点显胞元。理论推导了决定挤压膜气动力学特性的Reynolds方程,利用挤压膜的“活塞效应”得到了输出托浮力的力学模型及近似解,利用搭建的实验平台开展了盲文点显胞元的振动特性测试和输出性能测试。结果表明:该盲文点显胞元的谐振频率为30.8 kHz,激励电压峰峰值在130~200 Vpp时,可以形成稳定且具备一定托浮能力的挤压膜。理论计算值与实验实测数据基本吻合,实验中三种不同质量的试样可被托起13.92~47.71μm的高度,盲文点显胞元具备足够的输出性能。At present,traditional Braille books have had difficulty meeting the needs of the blind,this paper proposes a new type of ultrasonic resonant Braille display cell based on the squeeze film generated by ultrasonic vibration.The Reynolds equation which de⁃termines the aerodynamic characteristics of the squeeze film is derived theoretically,the mechanical model and approximate solu⁃tion of the output buoyancy are obtained by using the“piston effect”of the squeeze film,the vibration characteristics and output performance test of Braille display cell were tested using the built experimental platform.The results show that the resonant fre⁃quency of the Braille display cell is 30.8 kHz,when the peak-to-peak value of the excitation voltage is 130 Vpp to 200 Vpp,a sta⁃ble squeeze film with certain buoyancy can be formed.The theoretical calculation results are basically consistent with the experi⁃mental results.In the experiment,three kinds of samples can be lifted from 13.92μm to 47.71μm,Braille display cell has suffi⁃cient output performance.

关 键 词：超声振动 盲文点显 压电作动器 挤压膜效应 

分 类 号：TB559[理学—物理] TP24[理学—声学] TP273[自动化与计算机技术—检测技术与自动化装置]