Design of a Linear Bi-Stable Compliant Crank-Slider-Mechanism (LBCCSM)

Alqasimi, Ahmad; Lusk, Craig P.; Chimento, Jairo

doi:10.1115/detc2014-34285

Cited by 6 publications

(4 citation statements)

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“…Negative stiffness can also be obtained through the exploitation of residual stress from thermal oxidation of silicon (Kuppens et al, 2019), while an ultrahigh processing temperature limits the general applicability of this method. Bistable CMs have also been widely adopted for stiffness adjustment of MEMS devices (Alqasimi et al, 2014;Li et al, 2022;De Laat et al, 2016). Their applicability in preloading the negativestiffness beams has been experimentally verified in the literature (Kuppens et al, 2021).…”

Section: A Preliminary Structural Concept Of the Mems-scale Sbcmmentioning

confidence: 99%

A miniaturized statically balanced compliant mechanism for on-chip ultralow wide-bandwidth vibrational energy harvesting

Liang,

Fu,

Hao

2024

Mech. Sci.

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Abstract. This research demonstrates a miniaturized statically balanced compliant mechanism (SBCM) at the micro-electromechanical systems (MEMS) scale. The primary objective is to integrate the MEMS-scale SBCM on chip as the fundamental structure of vibrational energy harvesters for powering low-energy-cost sensors and circuits. The static and dynamic characteristics of the micro-scale SBCM are investigated based on a 2D finite element analysis (FEA) model in COMSOL Multiphysics®. Static balancing is achieved by finely tuning the geometric parameters of the FEA SBCM model. The analytical, numerical, and FEA results confirm that the MEMS-scale SBCM is sensitive to ultralow wide-bandwidth excitation frequencies with weak accelerations. This micro-scale SBCM structure provides a structural solution to effectively lower the working frequencies of MEMS vibrational energy harvesters to ultralow ranges within a wide bandwidth. It overcomes the working frequency limit imposed by the size effect. This would significantly improve the dynamic performance of vibrational energy harvesters at the MEMS scale. In addition, a conceptual structure of the MEMS-scale SBCM is preliminary proposed for the integration of piezoelectric materials by MEMS technologies for vibrational energy harvesting.

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Section: A Preliminary Structural Concept Of the Mems-scale Sbcmmentioning

confidence: 99%

A miniaturized statically balanced compliant mechanism for on-chip ultralow wide-bandwidth vibrational energy harvesting

Liang,

Fu,

Hao

2024

Mech. Sci.

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“…To experimentally verify the bistability, it is sufficient to show that a mechanism has two configurations which it will hold while being perturbed (i.e., being shaken, turned upside down, etc.) Alqasimi et al demonstrated a shape-morphing space frame using a linear bistable compliant crank-slider mechanism [22] that is arranged in a specific pattern to produce a shape-changing structure [23]. Bistable shape-shifting surfaces can produce morphing structures with a line-of-sight integrity, i.e., effectiveness as a physical barrier [24].…”

Section: Introductionmentioning

confidence: 99%

A Lamina-Emergent Frustum Using a Bistable Collapsible Compliant Mechanism

Alfattani

Lusk

2018

Journal of Mechanical Design

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This paper presents a new bistable collapsible compliant mechanism (BCCM) that is utilized in a lamina-emergent frustum. The mechanism is based on transforming a polygon spiral into spatial frustum shape using a mechanism composed of compliant links and joints that exhibits a bistable behavior. A number of mechanism types (graphs) were considered to implement the shapemorphing spiral, including 4-bar, 6-bar, and 8-bar chains. Our design requirements permitted the selection of a particular 8-bar chain as the basis for the BCCM. The bistable behavior was added to the mechanism by introducing a snap-through bistability as the mechanism morphs. A parametric CAD was used to perform the dimensional synthesis. The design was successfully prototyped. We anticipate that the mechanism may be useful in commercial small animal enclosures or as a frame for a solar still. Fig. 1 The-ball-on-a-hill analogy for bistable mechanisms.

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“…These models include tensegrity mechanisms to alleviate stress, distributed-compliance grippers, and translational joints. The pseudo-rigid body model was developed to model compliant mechanisms as rigid links with spherical joints and torsional springs to represent compliance [19][20][21][22][23][24]. Examples using the technique primarily focus on modeling thin beams undergoing large static deformations with bistability, composite beams, small flexible hinges, extension mechanisms, and energy storage during motion, all of which would be computationally expensive to model relative to a rigid-body mechanics model.…”

Section: Introductionmentioning

confidence: 99%

Tuning of a Rigid-Body Dynamics Model of a Flapping Wing Structure With Compliant Joints

Calogero

Frecker

Hasnain

et al. 2017

Journal of Mechanisms and Robotics

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A method for validating rigid-body models of compliant mechanisms under dynamic loading conditions using motion tracking cameras and genetic algorithms is presented. The compliant mechanisms are modeled using rigid-body mechanics as compliant joints (CJ): spherical joints with distributed mass and three-axis torsional spring dampers. This allows compliant mechanisms to be modeled using computationally efficient rigid-body dynamics methods, thereby allowing a model to determine the desired stiffness and location characteristics of compliant mechanisms spatially distributed into a structure. An experiment was performed to validate a previously developed numerical dynamics model with the goal of tuning unknown model parameters to match the flapping kinematics of the leading edge spar of an ornithopter with contact-aided compliant mechanisms (CCMs), compliant mechanisms that feature self-contact to produce nonlinear stiffness, inserted. A system of computer motion tracking cameras was used to record the kinematics of reflective tape and markers placed along the leading edge spar with and without CCMs inserted. A genetic algorithm was used to minimize the error between the model and experimental marker kinematics. The model was able to match the kinematics of all markers along the spars with a root-mean-square error (RMSE) of less than 2% of the half wingspan over the flapping cycle. Additionally, the model was able to capture the deflection amplitude and harmonics of the CCMs with a RMSE of less than 2 deg over the flapping cycle.

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Design of a Linear Bi-Stable Compliant Crank-Slider-Mechanism (LBCCSM)

Cited by 6 publications

References 0 publications

A miniaturized statically balanced compliant mechanism for on-chip ultralow wide-bandwidth vibrational energy harvesting

A miniaturized statically balanced compliant mechanism for on-chip ultralow wide-bandwidth vibrational energy harvesting

A Lamina-Emergent Frustum Using a Bistable Collapsible Compliant Mechanism

Tuning of a Rigid-Body Dynamics Model of a Flapping Wing Structure With Compliant Joints

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