Spherical Bistable Micromechanism

Lusk, Craig P.; Howell, Larry L.

doi:10.1115/1.2885079

Cited by 21 publications

(5 citation statements)

References 13 publications

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“…By definition, a spherical mechanism is one in which all axes of rotation intersect at a common point, as illustrated in figure 3. Bistable spherical compliant mechanisms have been considered previously [27,28], but these mechanisms had fewer links than are found in a waterbomb base. Nevertheless, some of the concepts used in these investigations are applicable to the current study.…”

Section: Descriptionmentioning

confidence: 99%

Waterbomb base: a symmetric single-vertex bistable origami mechanism

Hanna

Lund

Lang³

et al. 2014

Smart Mater. Struct.

207

121

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The origami waterbomb base is a single-vertex bistable origami mechanism that has unique properties which may prove useful in a variety of applications. It also shows promise as a test bed for smart materials and actuation because of its straightforward geometry and multiple phases of motion, ranging from simple to more complex. This study develops a quantitative understanding of the symmetric waterbomb baseʼs kinetic behavior. This is done by completing kinematic and potential energy analyses to understand and predict bistable behavior. A physical prototype is constructed and tested to validate the results of the analyses. Finite element and virtual work analyses based on the prototype are used to explore the locations of the stable equilibrium positions and the force–deflection response. The model results are verified through comparisons to measurements on a physical prototype. The resulting models describe waterbomb base behavior and provide an engineering tool for application development.

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Section: Descriptionmentioning

confidence: 99%

Waterbomb base: a symmetric single-vertex bistable origami mechanism

Hanna

Lund

Lang³

et al. 2014

Smart Mater. Struct.

207

121

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“…The design is based on a bistable four-bar mechanism consisting of three relatively rigid links (blue, green, and cyan in Figure ) and one compliant link (red in Figure ). Analogous bistable four-bar mechanisms have previously been implemented in MEMS applications. , Here, the three relatively stiff links consist of a 10-helix bundle (hb), and the compliant link is a 6-hb of dsDNA. At either end of the compliant 6-hb, the cross section is increased to a 10-hb to allow appropriate attachment to other components.…”

mentioning

confidence: 99%

“…Analogous bistable four-bar mechanisms have previously been implemented in MEMS applications. 43,44 Here, the three relatively stiff links consist of a 10-helix bundle (hb), and the compliant link is a 6-hb of dsDNA. At either end of the compliant 6-hb, the cross section is increased to a 10-hb to allow appropriate attachment to other components.…”

mentioning

confidence: 99%

Direct Design of an Energy Landscape with Bistable DNA Origami Mechanisms

Zhou

Marras

et al. 2015

Nano Lett.

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Structural DNA nanotechnology provides a feasible technique for the design and fabrication of complex geometries even exhibiting controllable dynamic behavior. Recently we have demonstrated the possibility of implementing macroscopic engineering design approaches to construct DNA origami mechanisms (DOM) with programmable motion and tunable flexibility. Here, we implement the design of compliant DNA origami mechanisms to extend from prescribing motion to prescribing an energy landscape. Compliant mechanisms facilitate motion via deformation of components with tunable stiffness resulting in well-defined mechanical energy stored in the structure. We design, fabricate, and characterize a DNA origami nanostructure with an energy landscape defined by two stable states (local energy minima) separated by a designed energy barrier. This nanostructure is a four-bar bistable mechanism with two undeformed states. Traversing between those states requires deformation, and hence mechanical energy storage, in a compliant arm of the linkage. The energy barrier for switching between two states was obtained from the conformational distribution based on a Boltzmann probability function and closely follows a predictive mechanical model. Furthermore, we demonstrated the ability to actuate the mechanism into one stable state via additional DNA inputs and then release the actuation via DNA strand displacement. This controllable multistate system establishes a foundation for direct design of energy landscapes that regulate conformational dynamics similar to biomolecular complexes.

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“…Bowen et al 19 presented a position analysis of coupled spherical mechanisms found in action origami. Lusk and Howell 20 described a new micro-mechanism, namely, the spherical bistable micromechanism. Callegari et al 21 described the design of a robotic wrist that can perform spherical motions.…”

Section: Introductionmentioning

confidence: 99%

On the design of a novel fully compliant spherical four-bar mechanism

Parlaktaş

Tanık

2019

Advances in Mechanical Engineering

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In this article, a novel fully compliant spherical four-bar mechanism is introduced and its generalized design methodology is proposed. The original fully compliant mechanism lies on a plane at the free position (undeflected position); therefore, it has the advantages of ease of manufacturing, minimized parts, and no backlash. First, the mobility conditions of the mechanism are obtained. The dimensions of the mechanism are optimally calculated for maximum output rotation, while keeping the deflection of flexural hinges at an acceptable range. Using an optimization method, design tables are prepared to display the relationship between arc lengths and corresponding deflections of flexural hinges. Input–output torque relationship and stresses at compliant segments are obtained analytically. A mechanism dimensioned by this novel design method is analyzed by a finite element analysis method, and the analytical results are verified. Finally, the mechanism is manufactured and it is ensured that the deflections of the compliant segments are consistent with the theoretical results.

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Spherical Bistable Micromechanism

Cited by 21 publications

References 13 publications

Waterbomb base: a symmetric single-vertex bistable origami mechanism

Waterbomb base: a symmetric single-vertex bistable origami mechanism

Direct Design of an Energy Landscape with Bistable DNA Origami Mechanisms

On the design of a novel fully compliant spherical four-bar mechanism

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