The Experts below are selected from a list of 2460 Experts worldwide ranked by ideXlab platform
Chongjing Cao - One of the best experts on this subject based on the ideXlab platform.
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a Compliantly coupled dielectric elastomer actuator using magnetic repulsion
Applied Physics Letters, 2019Co-Authors: Chongjing Cao, Xing Gao, Andrew T ConnAbstract:Dielectric elastomer actuators (DEAs) have attracted growing research interest over the past two decades for their large actuation strain, inherent compliance, and low cost. The conical DEA configuration is particularly attractive thanks to their simple structure and high force/stroke actuation. A double cone DEA design with two antagonistic membranes allows active bidirectional actuation. However, in existing double cone DEA designs, the two membranes are rigidly coupled, which restricts their relative actuation response under periodic electrical input to 180° out-of-phase operation. This work presents a magnetically coupled DEA with Compliant Coupling by a magnetic repulsion. The Compliant Coupling allows two separate inputs with a fully adjustable phase difference. The current prototype demonstrates a peak normalized stroke of 14% (relative to the nominal DEA height) at a phase shift of 180° and a normalized linear expansion between the two membranes of up to 8.3% (relative to the nominal DEA height) at a phase shift of 0° at 0.5 Hz. This results in several emerging actuation behaviors, which could potentially be suitable for controllable shape changing actuations, active vibration damping, and bioinspired locomotion.
Andrew T Conn - One of the best experts on this subject based on the ideXlab platform.
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a Compliantly coupled dielectric elastomer actuator using magnetic repulsion
Applied Physics Letters, 2019Co-Authors: Chongjing Cao, Xing Gao, Andrew T ConnAbstract:Dielectric elastomer actuators (DEAs) have attracted growing research interest over the past two decades for their large actuation strain, inherent compliance, and low cost. The conical DEA configuration is particularly attractive thanks to their simple structure and high force/stroke actuation. A double cone DEA design with two antagonistic membranes allows active bidirectional actuation. However, in existing double cone DEA designs, the two membranes are rigidly coupled, which restricts their relative actuation response under periodic electrical input to 180° out-of-phase operation. This work presents a magnetically coupled DEA with Compliant Coupling by a magnetic repulsion. The Compliant Coupling allows two separate inputs with a fully adjustable phase difference. The current prototype demonstrates a peak normalized stroke of 14% (relative to the nominal DEA height) at a phase shift of 180° and a normalized linear expansion between the two membranes of up to 8.3% (relative to the nominal DEA height) at a phase shift of 0° at 0.5 Hz. This results in several emerging actuation behaviors, which could potentially be suitable for controllable shape changing actuations, active vibration damping, and bioinspired locomotion.
Kok-meng Lee - One of the best experts on this subject based on the ideXlab platform.
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Design analysis of a passive weight-support lower-extremity-exoskeleton with Compliant knee-joint
2015 IEEE International Conference on Robotics and Automation (ICRA), 2015Co-Authors: Kok-meng LeeAbstract:This paper presents the design concept of a weight-support lower-extremity-exoskeleton (LEE) with a Compliant joint to relieve compressive load in the knee. Along with a leg dynamic model and a knee bio-joint model, a Compliant exoskeleton knee-joint has been designed using topology optimization and experimentally evaluated. Results suggest that the gait-based design of a LEE can be divided into two parts in terms of knee angles; Compliant Coupling and body-weight support. The concept feasibility and dynamic models of the passive LEE design have been experimentally validated with measured plantar forces. Both simulation and experimental results agree with data in-vivo confirming the effectiveness of the LEE in supporting human body-weight during walking, and also provide a basis for computing the internal knee forces as a percentage of bodyweight.
Xing Gao - One of the best experts on this subject based on the ideXlab platform.
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a Compliantly coupled dielectric elastomer actuator using magnetic repulsion
Applied Physics Letters, 2019Co-Authors: Chongjing Cao, Xing Gao, Andrew T ConnAbstract:Dielectric elastomer actuators (DEAs) have attracted growing research interest over the past two decades for their large actuation strain, inherent compliance, and low cost. The conical DEA configuration is particularly attractive thanks to their simple structure and high force/stroke actuation. A double cone DEA design with two antagonistic membranes allows active bidirectional actuation. However, in existing double cone DEA designs, the two membranes are rigidly coupled, which restricts their relative actuation response under periodic electrical input to 180° out-of-phase operation. This work presents a magnetically coupled DEA with Compliant Coupling by a magnetic repulsion. The Compliant Coupling allows two separate inputs with a fully adjustable phase difference. The current prototype demonstrates a peak normalized stroke of 14% (relative to the nominal DEA height) at a phase shift of 180° and a normalized linear expansion between the two membranes of up to 8.3% (relative to the nominal DEA height) at a phase shift of 0° at 0.5 Hz. This results in several emerging actuation behaviors, which could potentially be suitable for controllable shape changing actuations, active vibration damping, and bioinspired locomotion.
Nurcan Gecer Ulu - One of the best experts on this subject based on the ideXlab platform.
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Computational Design and Evaluation Methods for Empowering Non-Experts in Digital Fabrication
2018Co-Authors: Nurcan Gecer UluAbstract:Despite the increasing availability of personal fabrication hardware and services, the true potential of digital fabrication remains unrealized due to lack of computational techniques that can support 3D shape design by nonexperts. This work develops computational methods that address two key aspects of content creation:(1) Function-driven design synthesis, (2) Design assessment. For design synthesis, a generative shape modeling algorithm that facilitates automatic geometry synthesis and user-driven modification for nonexperts is introduced. A critical observation that arises from this study is that the most geometrical specifications are dictated by functional requirements. To support design by high-level functional prescriptions, a physics based shape optimization method for Compliant Coupling behavior design has been developed. In line with this idea, producing complex 3D surfaces from flat 2D sheets by exploiting the concept of buckling beams has also been explored. Effective design assessment, the second key aspect, becomes critical for problems in which computational solutions do not exist. For these problems, this work proposes crowdsourcing as a way to empower non-experts in esoteric design domains that traditionally require expertise and specialized knowledge.