Micromechanical active amplifiers using the mechanical resonance modulated by motion-dependent stiffness = 변위에 따른 탄성계수 변화를 이용한 기계적 공진의 변조 및 미소기계적 능동 증폭기

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This thesis presents micromechanical active amplifiers for high-sensitive microsensors and high-force actuators. The previous micromechanical passive amplifiers use lever mechanisms without energy sources, thus unable to amplify both displacement and force. The present devices, however, use carrier motion actuators (energy source) to apply the mechanical resonance modulated by variable springs, thereby amplifying displacement and force simultaneously. We design, fabricate, and characterize two types of the micromechanical active amplifiers, where we connect two different variable springs to the carrier motion actuators. The two variable springs have the identical initial stiffness of 10.2 ±0.8N/m while the variable springs A and B are designed to increase the stiffness change (0~1.69N/m) by the input motion (0~0.945μm) and to decrease the stiffness (2.37N/m) of the input part, respectively. The carrier motion actuators generate the identical resonant motion of 8.06±0.11μm at the different frequencies of 16.95kHz and 18.5kHz in the micromechanical active amplifiers A and B, respectively. In the experimental study of the micromechanical amplifiers, we verify that the present devices amplify both displacement and force: The amplifier A shows the displacement and force gains of 5.62 and 7.92 at the nonlinearity of 2.26% for the input motion of 0~0.945μm; The amplifier B shows the displacement and force gains of 2.62 and 11.6 at the nonlinearity of 1.52% for the input motion of 0~1.08μm. These results also indicate that the amplifier A has the higher displacement gain and the lower force gain compared to the amplifier B. We also characterize the motion interference in the amplifiers. In this characterization, we verify that the amplifier B, whose variable spring has small input stiffness, can reduce the motion interference: The carrier motions induce unwanted input motions of 0.214μm and 0.031μm in the amplifiers A and B, respectively; The input motions in...
Advisors
Cho, Young-Horesearcher조영호researcher
Description
한국과학기술원 : 바이오시스템학과,
Publisher
한국과학기술원
Issue Date
2006
Identifier
255489/325007  / 020043654
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 바이오시스템학과, 2006.2, [ x, 65 p. ]

Keywords

motion-dependent stiffness change; mechanical resonance; Micromechanical active amplifier; displacement and force amplification; 변위와 힘 증폭; 변위에 따른 탄성계수 변화; 기계적 공진; 미소기계 능동 증폭기

URI
http://hdl.handle.net/10203/27119
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=255489&flag=dissertation
Appears in Collection
BiS-Theses_Master(석사논문)
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