Optimal design of robust piezoelectric unimorph microgrippers

Ruiz, David; Díaz-Molina, Alex; Sigmund, Ole; Donoso, Alberto; Bellido, José C.; Sánchez‐Rojas, J. L.

doi:10.1016/j.apm.2017.10.024

Cited by 25 publications

(12 citation statements)

References 27 publications

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“…This causes problems over time as the position and accuracy of the gripper may become unknown and will produce errors during the manipulation process. A similar gripper was developed with the intention of becoming an automated system for the purpose of manipulating a microwire (Ruiz et al 2018). The gripper jaw had a cantilever structure using electromagnetic actuator.…”

Section: Electromagnetic Microgrippersmentioning

confidence: 99%

“…The gripper jaw had a cantilever structure using electromagnetic actuator. The gripper system was developed in order to manipulate a 50-70 lm diameter copper wire and move it to a desired position (Ruiz et al 2018). The research trialled various arm lengths and jaw angles of microgripper and recognised the disadvantages of using a long tip as it reduces the clamping force available to grip the wire (Ruiz et al 2018).…”

Section: Electromagnetic Microgrippersmentioning

confidence: 99%

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Microgripper design and evaluation for automated µ-wire assembly: a survey

2020

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Microgrippers are commonly used for micromanipulation of micro-objects from 1 to 100 lm and attain features of reliable accuracy, low cost, wide jaw aperture and variable applied force. This paper aim is to review the design of different microgrippers which can manipulate and assemble l-wire to PCB connectors. A review was conducted on microgrippers' technologies, comparing fundamental components of structure and actuators' types, which determined the most suitable design for the required micromanipulation task. Various microgrippers' design was explored to examine the suitability and the execution of requirements needed for successful micromanipulation.

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Section: Electromagnetic Microgrippersmentioning

confidence: 99%

Section: Electromagnetic Microgrippersmentioning

confidence: 99%

Microgripper design and evaluation for automated µ-wire assembly: a survey

2020

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“…In the seminal works by Sigmund and Torquato [16], and Sigmund [17,18], metamaterials of negative thermal expansion, and micro-electromechanical actuators are designed, respectively. The idea of thermally driven actuation and multiphysical coupling has been widely explored thereafter, leading to the works including the extensions to different topology optimization approaches [19,20], the designs of piezo-electric actuators [21,22,23,24], and the designs of recent 4D printed structures that exhibit self-morphing behavior [25,26].…”

Section: Introductionmentioning

confidence: 99%

Level-set topology optimization considering nonlinear thermoelasticity

Chung

Kim

2020

Computer Methods in Applied Mechanics and Engineering

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At elevated temperature environments, elastic structures experience a change of the stress-free state of the body that can strongly influence the optimal topology of the structure. This work presents level-set based topology optimization of structures undergoing large deformations due to thermal and mechanical loads. The nonlinear analysis model is constructed by multiplicatively decomposing thermal and mechanical effects and introducing an intermediate stress-free state between the undeformed and deformed coordinates. By incorporating the thermoelastic nonlinearity into the level-set topology optimization scheme, wider design spaces can be explored with the consideration of both mechanical and thermal loads. Four numerical examples are presented that demonstrate how temperature changes affect the optimal design of large-deforming structures. In particular, we show how optimization can manipulate the material layout in order to create a counteracting effect between thermal and mechanical loads, even up to a degree that buckling and snap-through are suppressed. Hence the consideration of large deformations in conjunction with thermoelasticity opens many new possibilities for controlling and manipulating the thermo-mechanical response via topology optimization.

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“…In particular, distributed vibration control of beams, plates and shells, using piezoelectric sensors and/or actuators, has been studied from different points of view. Among others, it is remarkable to mention classical and optimal feedback control strategies, optimal design of sensor and actuators, and uniform stabilization and controllability techniques …”

Section: Introductionmentioning

confidence: 99%

A polynomial chaos‐based approach to risk‐averse piezoelectric control of random vibrations of beams

Marín

Martínez-Frutos

Periago

2018

Numerical Meth Engineering

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Summary This paper proposes a risk‐averse formulation for the problem of piezoelectric control of random vibrations of elastic structures. The proposed formulation, inspired by the notion of risk aversion in economy, is applied to the piezoelectric control of a Bernoulli‐Euler beam subjected to uncertainties in its input data. To address the high computational burden associated to the presence of random fields in the model and the discontinuities involved in the cost functional and its gradient, a combination of a nonintrusive anisotropic polynomial chaos approach for uncertainty propagation with a Monte Carlo sampling method is proposed. In the first part, the well‐posedness of the control problem is established by proving the existence of optimal controls. In the second part, an adaptive gradient‐based method is proposed for the numerical resolution of the problem. Several experiments illustrate the performance of the proposed approach and the significant differences that may occur between the classical deterministic formulation of the problem and its stochastic risk‐averse counterpart.

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Optimal design of robust piezoelectric unimorph microgrippers

Abstract: J. L. (2018). Optimal design of robust piezoelectric unimorph microgrippers. Applied Mathematical Modelling, 55, 1-12.

Cited by 25 publications

References 27 publications

Microgripper design and evaluation for automated µ-wire assembly: a survey

Microgripper design and evaluation for automated µ-wire assembly: a survey

Level-set topology optimization considering nonlinear thermoelasticity

A polynomial chaos‐based approach to risk‐averse piezoelectric control of random vibrations of beams

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