Design of Large-Displacement Compliant Joints

Trease, Brian P.; Moon, Yong-Mo; Kota, Sridhar

doi:10.1115/1.1900149

Cited by 312 publications

(176 citation statements)

References 6 publications

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“…13 Specific points in the structure are deliberately weakened by making them thin, so that the hinge bends reversibly under stress. Such mechanisms are typically metal, but the greater compliance of plastic compared to metal allows a longer range of motion in flexure joints 14 and can thus be an advantage. However, the mechanism must be carefully designed to account for plastic's lower stiffness compared to metal.…”

Section: D Printed Hingesmentioning

confidence: 99%

A one-piece 3D printed flexure translation stage for open-source microscopy

Sharkey

Foo

Kabla

et al. 2016

Review of Scientific Instruments

137

116

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Open source hardware has the potential to revolutionise the way we build scientific instruments; with the advent of readily-available 3D printers, mechanical designs can now be shared, improved and replicated faster and more easily than ever before. However, printed parts are typically plastic and often perform poorly compared to traditionally machined mechanisms. We have overcome many of the limitations of 3D printed mechanisms by exploiting the compliance of the plastic to produce a monolithic 3D printed flexure translation stage, capable of sub-micron-scale motion over a range of 8×8×4 mm. This requires minimal post-print cleanup, and can be automated with readily-available stepper motors. The resulting plastic composite structure is very stiff and exhibits remarkably low drift, moving less than 20 µm over the course of a week, without temperature stabilisation. This enables us to construct a miniature microscope with excellent mechanical stability, perfect for timelapse measurements in situ in an incubator or fume hood. The ease of manufacture lends itself to use in containment facilities where disposability is advantageous, and to experiments requiring many microscopes in parallel. High performance mechanisms based on printed flexures need not be limited to microscopy, and we anticipate their use in other devices both within the laboratory and beyond.

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Section: D Printed Hingesmentioning

confidence: 99%

A one-piece 3D printed flexure translation stage for open-source microscopy

Sharkey

Foo

Kabla

et al. 2016

Review of Scientific Instruments

137

116

View full text Add to dashboard Cite

show abstract

“…Compliant mechanisms can be roughly divided into four categories depending on their force-deflection characteristics: spring-like compliant mechanisms (Trease et al, 2005), multistable compliant mechanisms (Oh and Kota, 2009;Gerson et al, 2008;Chen et al, 2011bChen et al, , 2010, constantforce compliant mechanisms (Nahar and Sugar, 2003;Lan et al, 2010), and statically-balanced compliant mechanisms (Herder and van den Berg, 2000;Gallego and Herder, 2010). Statically-balanced compliant mechanisms may be considCorrespondence to: G. Chen (guimin.chen@gmail.com) ered a constant-force compliant mechanism with zero force input.…”

Section: Introductionmentioning

confidence: 99%

Fully-compliant statically-balanced mechanisms without prestressing assembly: concepts and case studies

Chen

Zhang

2011

Mech. Sci.

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Abstract. The purpose of this paper is to present new concepts for designing fully-compliant staticallybalanced mechanisms without prestressing assembly. A statically-balanced compliant mechanism can ideally provide zero stiffness and energy free motion like a traditional rigid-body mechanism. These characteristics are important in design of compliant mechanisms where low actuation force, accurate force transmission or high-fidelity force feedback are primary concerns. Typically, static balancing of compliant mechanisms has been achieved by means of prestressing assembly. However, this can often lead to creep and stress relaxation arising in the flexible members. In this paper two concepts are presented which eliminate the need for prestressing assembly of compliant mechanisms: (1) a weight compensator which employs a constant-force compliant mechanism, (2) a near-zero-stiffness mechanism which combines two multistable mechanisms. In addition to the advantages provided by statically-balanced compliant mechanisms, two other notable features of these statically-balanced mechanisms are their ability to be monolithically fabricated and to return to their as-fabricated position without any disassembly when not in use.

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“…In practice, the source of these torques can include nonlinear stiffness, viscous damping, and other friction effects depending on the type of joints. Detailed information on the stiffness of flexures can be found in Smith (2000) and Trease et al (2005). Discussion and references regarding the modeling of friction and damping of pendulums can be found in Peters (2009): E Q -T A R G E T ; t e m p : i n t r a l i n k -; d f 2 6 ; 5 5 ; 3 5 0 x 2 x 0 d 1 θ 1 d 2 θ 2 ; 26 E Q -T A R G E T ; t e m p : i n t r a l i n k -; d f 2 7 ; 5 5 ; 3 0 4 τ 1 −k 1 θ 1 − θ 0 ; 27 E Q -T A R G E T ; t e m p : i n t r a l i n k -; d f 2 8 ; 5 5 ; 2 7 8 τ 2 −k 2 θ 2 − θ 1 :…”

Section: Transfer Function From Input Translation To Inertialmentioning

confidence: 99%

“…An example using a notch type flexure is shown in Figure 11b. Useful information can be found in Smith (2000) or Trease et al (2005).…”

Section: Practical Considerationsmentioning

confidence: 99%

On the Use of Mechanical Filters to Attenuate the Transmission of Tilt Motion to Inertial Sensors

Matichard¹,

Mittleman²,

Evans³

2016

Bulletin of the Seismological Society of America

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Inertial sensors such as seismometers, geophones, and accelerometers cannot distinguish horizontal motion from tilt motion. Rotation measurements can be used to subtract the tilt component from horizontal measurements, but the noise in the tilt sensor is often a limiting factor. No mechanism can change the dual sensitivity of inertial sensors to tilt and translation, but the transmission of ground motion can be mechanically filtered in a frequency-dependent way. This article discusses the use of mechanical filters to reduce the transmission of tilt motion from the ground to inertial instruments, which can be applied to existing sensors, or considered for integration in the design of new horizontal sensors. The limitations of this approach are related to (1) geometrical couplings due to the separation between the reference point and the input point of the mechanical filter, (2) residual tilt transmission through the joints stiffness, (3) effects of the mechanical filtering on the signal-to-noise ratio of the horizontal motion measurement, and (4) practical difficulties with the implementation of such concepts, including thermal noise in the flexures. This study analyzes and quantifies the benefits and limitations of the mechanical filtering approach for seismic studies and for seismic isolation applications.

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Design of Large-Displacement Compliant Joints

Cited by 312 publications

References 6 publications

A one-piece 3D printed flexure translation stage for open-source microscopy

A one-piece 3D printed flexure translation stage for open-source microscopy

Fully-compliant statically-balanced mechanisms without prestressing assembly: concepts and case studies

On the Use of Mechanical Filters to Attenuate the Transmission of Tilt Motion to Inertial Sensors

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