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Actuators, Volume 10, Issue 4

April 2021 - 19 articles

Cover Story: Parallel elastic actuators (PEA) are supposed to improve efficiency in periodic processes. In the presented study, a clutched parallel elastic actuator (CPEA) was integrated into the hip joint of an exoskeleton to provide more efficient support during gait. In gait experiments on the treadmill, the actuators were controlled using a cascaded control system with position reference. The CPEA achieved an up to 31% lower peak torque and up to 36% lower RMS power consumption than a direct actuator. Therefore, the actuator technology is promising for future applications in mobile rehabilitation robotics. View this paper.
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Articles (19)

  • Article
  • Open Access
19 Citations
4,996 Views
20 Pages

8 April 2021

To mitigate the issue of low accuracy and poor robustness of the master cylinder pressure estimation (MCPE) of the electro-hydraulic brake system (EHB) by adopting EHB’s own information, a MCPE algorithm based on vehicle information considering the e...

  • Article
  • Open Access
12 Citations
3,880 Views
14 Pages

8 April 2021

In this work we present a soft crawler fabricated using a magneto-active elastomer. The crawler is controlled by an external magnetic field to produce two locomotion patterns: peristaltic and caterpillar crawling. Due to its structural simplicity, lo...

  • Article
  • Open Access
3 Citations
3,599 Views
21 Pages

7 April 2021

This study addresses an alternative use of viscous dampers (VDs) associated with buckling restrained braces (BRBs) as innovative seismic protection devices. For this purpose, 4-, 8- and 12-story steel bare frames were designed with 6.5 m equal span l...

  • Article
  • Open Access
8 Citations
4,047 Views
27 Pages

6 April 2021

Inaccuracies in modeling of the geometric shape of PAMs has long been cited as a probable source of error in modeling and design efforts. The geometric shape and volume of PAMs is commonly approximated using a cylindrical shape profile, even though i...

  • Article
  • Open Access
19 Citations
4,690 Views
15 Pages

4 April 2021

This paper aims to develop viscoelastic dampers, which can effectively suppress vibration in a wide frequency range. First, several viscoelastic materials for damping performance were selected, and different batches of cylindrical viscoelastic damper...

  • Article
  • Open Access
19 Citations
6,157 Views
14 Pages

Contactless Picking of Objects Using an Acoustic Gripper

  • Marc Röthlisberger,
  • Marcel Schuck,
  • Laurenz Kulmer and
  • Johann W. Kolar

31 March 2021

Acoustic levitation forces can be used to manipulate small objects and liquids without mechanical contact or contamination. This work presents analytical models based on which concepts for the controlled insertion of objects into the acoustic field a...

  • Article
  • Open Access
38 Citations
7,109 Views
21 Pages

Design, Manufacturing, and Characterization of Thin, Core-Free, Rolled Dielectric Elastomer Actuators

  • Julian Kunze,
  • Johannes Prechtl,
  • Daniel Bruch,
  • Bettina Fasolt,
  • Sophie Nalbach,
  • Paul Motzki,
  • Stefan Seelecke and
  • Gianluca Rizzello

30 March 2021

In this work, we develop a coreless rolled dielectric elastomer actuator (CORDEA) to be used as artificial muscles in soft robotic structures. The new CORDEA concept is based on a 50 µm silicone film with screen-printed electrodes made of carbon blac...

  • Article
  • Open Access
16 Citations
6,211 Views
23 Pages

XYZ Micropositioning System Based on Compliance Mechanisms Fabricated by Additive Manufacturing

  • Andres Ferrara-Bello,
  • Pedro Vargas-Chable,
  • Gerardo Vera-Dimas,
  • Rafael Vargas-Bernal and
  • Margarita Tecpoyotl-Torres

28 March 2021

This article presents the design and implementation of a micropositioning system actuated by three piezoelectric stacks to control its displacements on XYZ axes. The use of conventional piezoelectric buzzers allows us to reduce fabrication costs. The...

  • Article
  • Open Access
20 Citations
7,886 Views
14 Pages

26 March 2021

Usually, polyhedra are viewed as the underlying constructive cells of packing or tiling in many disciplines, including crystallography, protein folding, viruses structure, building architecture, etc. Here, inspired by the flexible origami polyhedra (...

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Actuators - ISSN 2076-0825Creative Common CC BY license