MEMS系统中微平板结构声振耦合性能研究

唐宇帆; 任树伟; 辛锋先; 卢天健

doi:10.6052/0459-1879-15-354

MEMS系统中微平板结构声振耦合性能研究

doi: 10.6052/0459-1879-15-354

唐宇帆^1,2,
任树伟^1,2,
辛锋先^1,2, ,,
卢天健^1,2

1.
西安交通大学航天航空学院, 多功能材料与结构教育部重点实验室, 西安 710049
2. 西安交通大学航天航空学院, 机械结构强度与振动国家重点实验室, 西安 710049

基金项目: 国家自然科学基金(51528501)，中央高校基本科研专项基金(2014qngz12) 和国家留学基金资助项目.

详细信息

通讯作者:
辛锋先,副教授,主要研究方向:轻质材料结构流固耦合动力学、声振耦合理论与实验.E-mail:fengxian.xin@gmail.com,fxxin@mail.xjtu.edu.cn

中图分类号: O326;O327
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- 被引次数: 0
出版历程
- 收稿日期: 2015-09-21
- 修回日期: 2016-03-18
- 刊出日期: 2016-07-18

SCALE EFFECT ANALYSIS FOR THE VIBRO-ACOUSTIC PERFORMANCE OF A MICRO-PLATE

Tang Yufan^1,2,
Ren Shuwei^1,2,
Xin Fengxian^{1,2
, ,},
Lu Tianjian^1,2

1.
MOE Key Laboratory for Multifunctional Materials and Structures, Xi'an Jiaotong University, Xi'an 710049, China
2. State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, China

摘要

摘要: 微机电系统(micro-electro-mechanical system，MEMS) 是指内部微结构尺寸在微米甚至纳米量级的微电子机械装置，是一个独立的智能系统. 长宽厚均处于微米量级的微平板为MEMS 中的典型结构，其声学和力学特性直接影响MEMS 的性能. 针对同时受声压激励和气膜力(通过考虑相同尺寸微平板振动引入) 作用的四边简支微平板结构，应用Cosserat 理论和Hamilton 原理，建立了考虑微尺度效应(本征长度和Knudsen 数)影响的声振耦合理论模型，并通过多重Fourier 展开法求解了耦合方程，得到了系统的传声损失结果. 通过频域分析，考虑微平板的不同振动频率、振动幅度和板间距，系统研究了不同尺度效应下微结构中气体薄膜所产生的阻尼力对微平板结构传声特性的影响. 研究发现尺度效应对于微结构的声振特性影响巨大，振动行为对微结构的传声特性也有很大影响，控制并减小微平板的振动幅度以及增大微平板的间距都能够提高微平板的声振性能. 研究结果为MEMS 中微平板的稳定性优化设计提供了理论参考.
- MEMS /
- 微平板 /
- 气膜力 /
- 传声损失
Abstract: Micro electromechanical system (MEMS) is an electromechanical device of microscale, in which micro-plate is the most typical structure. Its acoustical and mechanical properties influence the design of MEMS significantly. The vibroacoustic performance of simply supported micro-plate subjected to simultaneous stimulation of sound pressure and gas film (squeeze film) damping force is analyzed theoretically, the latter induced by the vibration of a micro-plate having similar size. By applying the Cosserat theory and the Hamilton principle, micro scale effects due to characteristic length and Knudsen number are taken into account. The governing equations are subsequently solved using the method of multiple Fourier transform to quantify sound transmission loss (STL) across the micro-plate. In the frequency domain, the effects of squeeze film under different circumstances (e.g., different characteristic lengths and Knudsen numbers, different vibration frequencies and amplitudes) on STL are investigated systematically. This work demonstrates the great influence of micro-scale effects, as well as vibration, on STL. Decreasing the vibration amplitude and increasing the distance between micro-plates lead to better performance of sound transmission. Results presented in this study provide useful theoretical guidance to the practical design of micro-plates in MEMS.
- MEMS /
- micro-plate /
- squeeze film /
- sound transmission loss

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