A method to increase the dynamic deformation of a dielectric elastomer minimum energy structures rotary joint without increase of the voltage amplitude

2019 ◽  
Vol 30 (14) ◽  
pp. 2091-2098
Author(s):  
Shu Wang ◽  
Bo Huang ◽  
David McCoul ◽  
Xinbo Wang ◽  
Jianwen Zhao
Keyword(s):  
Duty Cycle ◽  
Applied Voltage ◽  
Dynamic Deformation ◽  
Minimum Energy ◽  
Dielectric Elastomer ◽  
Voltage Amplitude ◽  
Rotary Joint ◽  
Optimization Principle ◽  
Key Factor ◽  
The Moment

The traditional method to increase the dynamic deformation of a dielectric elastomer actuator is to increase the voltage applied on the dielectric elastomer. Based on the characteristics of dielectric elastomer minimum energy structures, a method to increase the deformation is proposed, which does not increase the applied voltage amplitude. We found that the frequency and duty cycle of the applied voltage will influence the range of deformation strongly, and the moment the power is switched off, [Formula: see text] is a key factor to the deformation range; therefore, the frequency and duty cycle can be optimized to obtain the largest deformation range with an expected vibrational frequency. Two groups of experiments were compared to validate this optimization principle, and the range of deformation with optimized parameters was found to be 1.67 times larger on average than with normal parameters.

Phenomena of nonlinear oscillation and special resonance of a dielectric elastomer minimum energy structure rotary joint

2015 ◽  
Vol 106 (13) ◽  
pp. 133504 ◽  
Author(s):  
Jianwen Zhao ◽  
Junyang Niu ◽  
David McCoul ◽  
Zhi Ren ◽  
Qibing Pei
Keyword(s):  
Nonlinear Oscillation ◽  
Minimum Energy ◽  
Dielectric Elastomer ◽  
Energy Structure ◽  
Rotary Joint

New Resonance Mode of Dielectric Elastomer Minimum Energy Structure

2016 ◽  
Vol 97 ◽  
pp. 48-56
Author(s):  
Jian Wen Zhao ◽  
Yong Ge ◽  
Shu Wang ◽  
Bo Huang
Keyword(s):  
Minimum Energy ◽  
Bending Moment ◽  
Input Voltage ◽  
Dielectric Elastomer ◽  
Resonance Mode ◽  
Vibrational Amplitude ◽  
Energy Structure ◽  
Rotary Joint ◽  
Nature Frequency ◽  
Voltage Frequency

The dielectric elastomer minimum energy structure (DEMES) can realize large angular deformations by a small voltage-induced strain of the dielectric elastomer, so it is a suitable candidate to make a rotary joint for a soft robot. Driven with an alternating electric field, the joint deformation vibrational frequency follows the input voltage frequency. However, the authors find that if the rotational angel over a negative angle during dynamic response, the resonance mode will be different from the traditional, the vibration with the largest amplitude does not occur while the voltage frequency is equal to natural response frequency of the joint. Rather, the vibrational amplitude will be quite large over a range of other frequencies, at which the voltage frequency is greater than one time of the nature frequency and smaller than two times. This phenomenon was analyzed by relationship between the bending angle, applied voltage and bending moment of the film to the frame on a timeline. This new resonance mode can be applied to some biomimetic soft robots that consist of DEMES rotary joint.

Finite element modelling of dielectric elastomer minimum energy structures

2008 ◽  
Vol 94 (3) ◽  
pp. 507-514 ◽  
Author(s):  
Benjamin O’Brien ◽  
Thomas McKay ◽  
Emilio Calius ◽  
Shane Xie ◽  
Iain Anderson
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Minimum Energy ◽  
Dielectric Elastomer ◽  
Element Modelling

Dynamic Actuation of Electro-Elastic Spherical Membranes Using Dielectric Elastomers

Aerospace ◽  
2005 ◽  
Author(s):  
Nakhiah Goulbourne ◽  
Eric Mockensturm ◽  
Mary Frecker
Keyword(s):  
Dynamic Response ◽  
Applied Voltage ◽  
Gas Flow ◽  
Applied Pressure ◽  
Material Model ◽  
Dielectric Elastomer ◽  
Inertial Effects ◽  
Mechanical Pressure ◽  
Material Parameters ◽  
Dielectric Elastomer Actuators

This paper presents dynamic results for spherical dielectric elastomer actuators subject to an inflating mechanical pressure and an applied voltage. Different equilibria modes arise during dynamic operation due to inertial effects. In previous work, the inertial effects have been studied for the limited case of a constant applied pressure during membrane deformation [1]. Here, novel results are presented in which the dynamic response of spherical dielectric elastomer actuators to a pressure-time loading history as well as a more realistic constant gas flow rate are considered. The results are calculated for both the damped and the zero-damped cases. The spherical membrane is assumed to follow the Mooney material model where various inflation modes arise depending on the material parameters. The range of Mooney material parameters considered, the driving pressure and the applied voltage all affect the dynamic response.

Ejection and Motion Behaviors Simulation for Multi-Jet Electrospinning

2015 ◽  
Vol 645-646 ◽  
pp. 281-286
Author(s):  
Wen Wang Li ◽  
Zhi Wei Luo ◽  
Xiang Wang ◽  
Jian Yi Zheng ◽  
Gao Feng Zheng ◽  
...  
Keyword(s):  
Simulation Model ◽  
Applied Voltage ◽  
Industrial Application ◽  
Good Method ◽  
Repulsive Force ◽  
Maxwell Theory ◽  
Key Factor ◽  
Single Jet ◽  
Stretching Ratio ◽  
Stretching Process

Multi-jet ejection is the key factor to promote the industrial application of electrospinning technology. Simulation model based on Maxwell theory was built up to investigate the ejection and motion behaviors of multi charged jets. The charge Coulomb repulsive force among adjacent jet was introduced into the simulation model, which enhanced the instability motion and promoted the stretching process of charged jets. The stretching ratio of charged jet increased with the increasing of injection distance, applied voltage, distance between spinneret and collector. But stretching ratio of charged jet decreased with the increasing of distance between charged jets. Stretching ratio in multi-jet electrospinning was larger than that in single-jet electrospinning. The maximal stretching ratio of charged jet was larger than 9000 in the nine jets electrospinning mode. This work provided a good method to investigate the controlling technology of multi-jet electrospinning.

Effect of viscoelasticity on the nonlinear dynamic behavior of dielectric elastomer minimum energy structures

2021 ◽  
Vol 208-209 ◽  
pp. 141-153
Author(s):  
Aman Khurana ◽  
Ajay Kumar ◽  
Santosh Kumar Raut ◽  
Atul Kumar Sharma ◽  
M.M. Joglekar
Keyword(s):  
Dynamic Behavior ◽  
Nonlinear Dynamic ◽  
Minimum Energy ◽  
Dielectric Elastomer ◽  
Nonlinear Dynamic Behavior

Inverse Scattering Scheme Based on the Moment Method in the Spectral Domain, Part I: Theory

1992 ◽  
Vol 14 (1) ◽  
pp. 16-28 ◽  
Author(s):  
Se-Yun Kim ◽  
Hyun-Chul Choi ◽  
Jae-Min Lee ◽  
Jung-Woong Ra
Keyword(s):  
Inverse Scattering ◽  
Basis Function ◽  
Moment Method ◽  
Spectral Domain ◽  
Scattering Problems ◽  
Actual Mechanism ◽  
Spectral Components ◽  
Key Factor ◽  
The Moment ◽  
Measurement Location

Recently, electromagnetic and ultrasonic imaging of inhomogeneous objects by applying the moment-method procedures of forward scattering problems in the reverse sequence have been developed. In this paper, the inverse scattering formulation has been modified to be applicable in the spectral domain. Compared to previous schemes, the suggested formulation illustrates clearly the actual mechanism of the inverse scattering process by explicit separation of the contributions from several variables, such as the measurement location, basis function, and geometry of objects. The ill-posedness inherent in inverse scattering problems was also explained easily in this spectral scheme by the exponentially-decaying behavior of high-frequency spectral components of the scattered field. It implies that enlargement of the discretized cell size is a key factor in regularizing the ill-posedness. In particular, since the singular kernel to be integrated on each cell became regular in the modified scheme, various types of basis functions instead of pulse function were adopted without additional difficulties. This advantage is expected to play an important role in regularizing the noise effect by selecting polynomial basis function on the enlarged cells of discretization in the spectral inverse scattering scheme.

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