共查询到20条相似文献,搜索用时 109 毫秒
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基于MEMS工艺的电热致动器具有与集成电路兼容的驱动电压、大的致动位移和致动力,比静电致动器、压电致动器和磁致动器有更大的优势,是现阶段致动方式的研究热点.高精度、高可靠度、可控和稳定性好的电热致动器是未来研究的新方向.针对MEMS微加工工艺制作的固体材料电热致动器,综述了电热致动器的结构形式、典型应用、模型建立以及测试方法的研究现状和主要研究成果.对电热致动器的结构设计、建模分析和测试技术方面的关键技术和存在的主要问题进行了分析和展望,以期为基于MEMS工艺的电热致动器的设计、分析和测试提供借鉴和参考. 相似文献
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为提高在微变形镜应用中静电微致动器的冲程,设计并讨论了一种基于双端固定梁为上电极、曲面电极为下电极的异面微致动器。利用Rayleigh-Ritz方法,求解了致动器的静态特性。计算过程中,考虑了梁长度增大引起的抗拉应力和器件制造过程中残余应力的影响。通过研究不同的曲面电极轮廓形状对于致动器冲程的影响,得到了500 μm长的梁在300 V的驱动电压下其冲程最大能达到14.1 μm。 相似文献
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针对现有临床上所用的圆窗激振式人工中耳作动器存在的低频增益不足,与圆窗膜尺寸不匹配及初始压力不可控的问题,结合人耳解剖结构,设计了一款带有弯张放大器的新型压电作动器。为了辅助设计该作动器,建立了作动器有限元模型及作动器-人耳耦合力学模型。基于该模型,对作动器弯张放大器、支撑弹簧、耦合杆端面的关键参数进行了优化分析。通过实验对所设计的压电作动器的频响特性、总谐波失真进行测试。结果表明,所设计的压电作动器工作频带宽,低频性能优越;最大谐波失真仅为2.36%,满足助听装置清晰度要求。 相似文献
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压电微致动器元件的制作及特性分析 总被引:2,自引:0,他引:2
目的是设计和制作一种新型压电微致动器,用于高密度硬盘磁头的精确定位。其中,压电元件由传统的或改进的溶胶-凝胶工艺制备并利用反应离子刻蚀成型,压电层厚度范围为0.6~3μm。采用X-射线衍射和原子力显微镜等对PZT薄膜的物相、表面形貌以及颗粒尺寸等进行分析。结果显示,随着PZT层厚度从0.6~3μm的不断增加,其内部颗粒尺寸也相应增大,粗糙度越低。此外,该微致动器的驱动机理通过多普勒干涉仪进行测量。结果表明,对于封装了3μm厚PZT元件的U型微致动器悬臂装置,在±20 V交变电压作用下,微致动位移达到1.146μm,谐振频率超过22 kHz。 相似文献
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A terminating type MEMS microwave power sensor based on the Seebeck effect and compatible with the GaAs MMIC process is presented. An electrothermal model is introduced to simulate the thermal time constant. An analytical result, about 160 ms, of the thermal time constant from the non-stationary Fourier heat equations for the structure of the sensor is also given. The sensor measures the microwave power jumping from 15 to 20 dBm at a constant frequency 15 GHz, and the experimental thermal time constant result is 180 ms. The frequency is also changed from 20 to 10 GHz with a constant power 20 dBm, and the result is also 180 ms. Compared with the analytical and experimental results, the model is verified. 相似文献
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终端式MEMS微波功率传感器的热时间常数研究 总被引:1,自引:1,他引:0
A terminating type MEMS microwave power sensor based on the Seebeck effect and compatible with the GaAs MMIC process is presented.An electrothermal model is introduced to simulate the thermal time constant. An analytical result,about 160 ms,of the thermal time constant from the non-stationary Fourier heat equations for the structure of the sensor is also given.The sensor measures the microwave power jumping from 15 to 20 dBm at a constant frequency 15 GHz,and the experimental thermal time constant result is 180 ms.The frequency is also changed from 20 to 10 GHz with a constant power 20 dBm,and the result is also 180 ms.Compared with the analytical and experimental results,the model is verified. 相似文献
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This paper presents a dual approach for a coherent determination and validation of heterostructure bipolar transistor (HBT) thermal impedance. This study relies both on an experimental characterization method and a 3D finite element simulation approach. One section reminds briefly the experimental approach. Another describes the 3D device modeling used for the physics-based thermal simulation. Thereafter, details on the reduction method used for the numerical computation of the thermal impedance are given. As complement to pure thermal simulation, an electrothermal distributed model is proposed and gives an interpretation of the distributed effects in multi-finger devices. 相似文献
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Eduardo D. Martínez Carlos D. S. Brites Luís D. Carlos Alí F. García‐Flores Ricardo R. Urbano Carlos Rettori 《Advanced functional materials》2019,29(8)
The hasty progress in smart, portable, flexible, and transparent integrated electronics and optoelectronics is currently one of the driving forces in nanoscience and nanotechnology. A promising approach is the combination of transparent conducting electrode materials (e.g., silver nanowires, AgNWs) and upconverting nanoparticles (UCNPs). Here, electrochromic devices based on transparent nanocomposite films of poly(methyl methacrylate) and AgNWs covered by UCNPs of different sizes and compositions are developed. By combining the electrical control of the heat dissipation in AgNW networks with size‐dependent thermal properties of UCNPs, tunable electrochromic transparent devices covering a broad range of the chromatic diagrams are fabricated. As illustrative examples, devices mixing large‐sized (>70 nm) β‐NaYF4:Yb,Ln and small‐sized (<15 nm) NaGdF4:Yb,Ln@NaYF4 core@shell UCNPs (Ln = Tm, Er, Ce/Ho) are presented, permitting to monitor the temperature‐dependent emission of the particles by the intensity ratio of the Er3+ 2H11/2 and 4S3/2 → 4I15/2 emission lines, while externally controlling the current flow in the AgNW network. Moreover, by defining a new thermometric parameter involving the intensity ratio of transitions of large‐ and small‐sized UCNPs, a relative thermal sensitivity of 5.88% K?1 (at 339 K) is obtained, a sixfold improvement over the values reported so far. 相似文献
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The ability of high-voltage power MOSFETs to withstand avalanche events under different temperature conditions are studied by experiment and two-dimensional device simulation.The experiment is performed to investigate dynamic avalanche failure behavior of the domestic power MOSFETs which can occur at the rated maximum operation temperature range(-55 to 150℃).An advanced ISE TCAD two-dimensional mixed mode simulator with thermodynamic non-isothermal model is used to analyze the avalanche failure mechanism.The unclamped inductive switching measurement and simulation results show that the parasitic components and thermal effect inside the device will lead to the deterioration of the avalanche reliability of power MOSFETs with increasing temperature.The main failure mechanism is related to the parasitic bipolar transistor activity during the occurrence of the avalanche behavior. 相似文献
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高温红外电热膜的制备与特性研究 总被引:1,自引:0,他引:1
采用蒸镀法制备掺杂的二氧化锡电热膜,并研究了溶液成分,掺杂浓度对电热膜的电
阻、电阻温度特性以及红外辐射性能的影响,得到电阻性能稳定且发射率高的高温红外电热膜。 相似文献
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电热激励微悬臂梁谐振器输出电压影响因素研究 总被引:2,自引:0,他引:2
制作了电热激励硅 /二氧化硅双层微悬臂梁谐振器。对影响谐振器输出电压的因素研究结果表明 :减小梁宽度、硅层厚度、环境气压和温度 ,可增大微悬臂梁谐振器输出电压 ;输出电压随激励功率增加而增大 ;谐振器输出电压与谐振器根部压敏电桥电源电压成正比。最后论述了提高谐振器输出电压的可行途径 相似文献