Robust Design of Thermally Actuated Micro-Cantilever Using Numerical Simulations

Komeili, Mojtaba; Menon, Carlo

doi:10.2507/ijsimm15(3)2.340

Cited by 6 publications

(3 citation statements)

References 19 publications

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“…Cantilever design follows the finite element analysis done to investigate the dynamic behavior of a micro-cantilever that is transversely excited at its base using a free-standing metallic actuator that is expanding and contracting due to thermal cycles, reported in our previous works [20][21][22][23][24]. Figure 1 shows a three-dimensional (3D) model of the thermal actuator, dual-clad optical fiber, and fiber cantilever, mounted in the bore of a hypodermic needle.…”

Section: Actuator Design and Fabrication Processmentioning

confidence: 99%

An Electro-Thermal Actuation Method for Resonance Vibration of a Miniaturized Optical-Fiber Scanner for Future Scanning Fiber Endoscope Design

Ahrabi

Kaur

et al. 2019

Actuators

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Medical professionals increasingly rely on endoscopes to carry out many minimally invasive procedures on patients to safely examine, diagnose, and treat a large variety of conditions. However, their insertion tube diameter dictates which passages of the body they can be inserted into and, consequently, what organs they can access. For inaccessible areas and organs, patients often undergo invasive and risky procedures—diagnostic confirmation of peripheral lung nodules via transthoracic needle biopsy is one example from oncology. Hence, this work sets out to present an optical-fiber scanner for a scanning fiber endoscope design that has an insertion tube diameter of about 0.5 mm, small enough to be inserted into the smallest airways of the lung. To attain this goal, a novel approach based on resonance thermal excitation of a single-mode 0.01-mm-diameter fiber-optic cantilever oscillating at 2–4 kHz is proposed. The small size of the electro-thermal actuator enables miniaturization of the insertion tube. Lateral free-end deflection of the cantilever is used as a benchmark for evaluating performance. Experimental results show that the cantilever can achieve over 0.2 mm of displacement at its free end. The experimental results also support finite element simulation models which can be used for future design iterations of the endoscope.

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Section: Actuator Design and Fabrication Processmentioning

confidence: 99%

An Electro-Thermal Actuation Method for Resonance Vibration of a Miniaturized Optical-Fiber Scanner for Future Scanning Fiber Endoscope Design

Ahrabi

Kaur

et al. 2019

Actuators

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“…Due to their exciting properties, nanowires are promising candidates for detecting nano-objects with high sensitivity, and also they can be potentially employed in several fields, such as measurement systems [1,2], Micro/Nanoelectromechanical Systems (M/NEMS) [3], biological or gas sensing devices [4], flexible electronics and renewable energy technologies [5], integrated Shape Memory Alloy (SMA) [6], resonators and actuators [7,8] and multifunctional NEMSs.…”

Section: Introductionmentioning

confidence: 99%

Instability Characteristics of Free-Standing Nanowires Based on the Strain Gradient Theory with the Consideration of Casimir Attraction and Surface Effects

Sedighi

Ouakad

Khooran

2017

Metrology and Measurement Systems

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Size-dependent dynamic instability of cylindrical nanowires incorporating the effects of Casimir attraction and surface energy is presented in this research work. To develop the attractive intermolecular force between the nanowire and its substrate, the proximity force approximation (PFA) for small separations, and the Dirichlet asymptotic approximation for large separations with a cylinder-plate geometry are employed. A nonlinear governing equation of motion for free-standing nanowires − based on the Gurtin-Murdoch model − and a strain gradient elasticity theory are derived. To overcome the complexity of the nonlinear problem in hand, a Garlerkinbased projection procedure for construction of a reduced-order model is implemented as a way of discretization of the governing differential equation. The effects of length-scale parameter, surface energy and vacuum fluctuations on the dynamic instability threshold and adhesion of nanowires are examined. It is demonstrated that in the absence of any actuation, a nanowire might behave unstably, due to the Casimir induction force.

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“…This acts as a base excitation for the beam. Komeili and Menon [21,22] studied the response of micro-cantilever beam to thermal cycles at its base, along with sensitivity analysis on the system, using Finite Element method. Later on, they showed an analytical model for a 2 dimensional micro-cantilever excited at its base [23].…”

Section: Introductionmentioning

confidence: 99%

Resonance vibration of an optical fiber micro-cantilever using electro-thermal actuation

Komeili¹,

Ahrabi²,

Menon³

2017

Math. models, eng.

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Abstract. The resonance excitation of an optical fiber actuated by a conductive wire is studied in this paper. A novel approach based on exciting the micro-cantilever fiber at a location close to its base is proposed for this purpose. Analytical modeling is conducted on the mechanical models of this system in order to predict its behavior. The continuous Euler-Bernoulli beam equation with the effect of surrounding fluid medium is formulated as a boundary value problem. The natural frequencies of the system and its harmonic response are expanded analytically, and results are verified using Finite Element analysis. The obtained analytical solutions are used to draw conclusions on the response of the system and suggestions to optimize its performance are presented. In order to verify the idea in practice, an experimental setup that can closely resemble the system under consideration is made in the laboratory and its response to a periodic input with different frequencies are recorded. Comparison between the results of analytical formulation and experimental observations highlights the effectiveness of suggested technique in resonance vibration of optical fibers.

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Robust Design of Thermally Actuated Micro-Cantilever Using Numerical Simulations

Cited by 6 publications

References 19 publications

An Electro-Thermal Actuation Method for Resonance Vibration of a Miniaturized Optical-Fiber Scanner for Future Scanning Fiber Endoscope Design

An Electro-Thermal Actuation Method for Resonance Vibration of a Miniaturized Optical-Fiber Scanner for Future Scanning Fiber Endoscope Design

Instability Characteristics of Free-Standing Nanowires Based on the Strain Gradient Theory with the Consideration of Casimir Attraction and Surface Effects

Resonance vibration of an optical fiber micro-cantilever using electro-thermal actuation

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