共查询到11条相似文献,搜索用时 87 毫秒
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基于薄膜体声波谐振器(FBAR)的力学传感器有很大的应用潜力,但其应力负载效应的敏感机理尚不明确。电极化效应可能是应力负载效应的敏感机理之一。为了研究电极化效应对谐振频率的影响,提出了电极化效应的解析模型。首先根据在理想FBAR中并联谐振频率与纵波声速的关系,推导出并联谐振频率关于压电层材料参数的表达式;然后根据直流电压主要对FBAR的弹性常数和厚度的影响,推导出并联谐振频率与直流电压的关系;最后利用压电效应,得到了力载荷与并联谐振频率的关系。代入数值计算得到并联谐振频率的相对偏移量为+1.003%@400 V,对比测试结果,并联谐振频率的相对偏移量为+0.90%@400 V,验证了模型的正确性。计算了力载荷为1 mN时,电极化效应导致谐振频率的偏移量约为0.5 kHz。对比实验测得的应力负载效应对谐振频率的偏移量最低约为262 kHz,证明了在应力负载效应中,电极化效应对谐振频率偏移的影响可忽略。 相似文献
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微驱动器的原理与应用 总被引:8,自引:0,他引:8
为了优化设计微驱动器,笔者通过对比近年来各种微驱动器的研究和发展,系统地概括总结了微驱动器所采用的主要的驱动原理、驱动方式和加工技术及其存在的优缺点等。并在此基础上,首次将微驱动器按功能进行了分类。 相似文献
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Versatile Microfluidic Platforms Enabled by Novel Magnetorheological Elastomer Microactuators 下载免费PDF全文
Shi‐Yang Tang Xuchun Zhang Shuaishuai Sun Dan Yuan Qianbin Zhao Sheng Yan Lei Deng Guolin Yun Jun Zhang Shiwu Zhang Weihua Li 《Advanced functional materials》2018,28(8)
Microfluidic systems enable rapid diagnosis of diseases, biological analysis, drug screening, and high‐precision materials synthesis. In spite of these remarkable abilities, conventional microfluidic systems are microfabricated monolithically on a single platform and their operations rely on bulky expensive external equipment. This restricts their applications outside of research laboratories and prevents development and assembly of truly versatile and complex systems. Here, novel magnetorheological elastomer (MRE) microactuators are presented including pumps and mixers using an innovative actuation mechanism without the need of delicate elements such as thin membranes. Modularized elements are realized using such actuators, which can be easily integrated and actuated using a single self‐contained driving unit to create a modular, miniaturized, and robust platform. The performance of the microactuators is investigated via a series of experiments and a proof‐of‐concept modular system is developed to demonstrate the viability of the platform for self‐contained applications. The presented MRE microactuators are small size, simple, and efficient, offering a great potential to significantly advance the current research on complex microfluidic systems. 相似文献
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基于热膨胀效应的微执行器进展 总被引:8,自引:2,他引:8
本文首先分析了热驱动微执行器的基本及其相对于静电驱动,磁驱动的优势。接着分析了五种常见的热驱动结构的原理,特点,它们的某些典型应用也随后作了介绍,最后对热驱动微执行器计算机辅助设计的前景进行了展望。 相似文献
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针对深反应离子刻蚀(DRIE)工艺加工高深宽比梳齿电容存在侧壁倾斜角的情况,分析了该倾斜角对梳齿谐振器频率的影响。为了使设计的梳齿谐振器频率符合应用要求,推导出了梳齿谐振器在正负侧壁倾斜角θ下的谐振频率计算公式。利用ANSYS Workbench11.0平台,分别对侧壁倾斜角为0°,0.2°,0.35°和0.5°的情形进行了有限元建模与模态仿真。仿真结果表明:随着正倾斜角的增大,谐振频率减小;负倾斜角增大时,谐振频率增大,且一阶模态振形的平稳程度越差。比较数值仿真结果与考虑了正负倾斜角误差的梳齿谐振器谐振频率计算公式计算结果对比,吻合较好。 相似文献
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