Results 31 to 40 of about 14,238 (264)

Degrees of freedom effects on a laboratory scale WEC point absorber

International Marine Energy Journal
There are many archetypes of wave energy converters (WEC) that vary widely in operating principles, geometry, controls, number of bodies, and degrees of freedom (DOF).
Courtney Beringer, Bret Bosma, Bryson Robertson   +2 more
doaj   +1 more source

A Comparative Study of Model Predictive Control and Optimal Causal Control for Heaving Point Absorbers

Journal of Marine Science and Engineering, 2021
Efforts by various researchers in recent years to design simple causal control laws that can be applied to WEC devices suggest that these controllers can yield similar levels of energy output as those of more complex non-causal controllers. However, most
Mirko Previsic, Anantha Karthikeyan, Jeff Scruggs   +2 more
doaj   +1 more source

Exploring the Potential for Increased Production from the Wave Energy Converter Lifesaver by Reactive Control

Energies, 2013
Fred Olsen is currently testing their latest wave energy converter (WEC), Lifesaver, outside of Falmouth Bay in England, preparing it for commercial operation at the Wavehub test site.
Marta Molinas, Jonas Sjolte, Christian McLisky Sandvik, Elisabetta Tedeschi   +3 more
doaj   +1 more source

Geometry Optimization of Heaving Axisymmetric Point Absorbers under Parametrical Constraints in Irregular Waves

Journal of Marine Science and Engineering, 2021
The objective of this work is to identify the maximum absorbed power and optimal buoy geometry of a heaving axisymmetric point absorber for a given cost in different sea states.
Jinming Wu
doaj   +1 more source

Brock's approaching zero method improved as approaching fixed point frequency to solve optimum damping ratio of dynamic vibration absorber in machine tools and experimental confirmation.

PLoS ONE
The design parameters of the dynamic vibration absorber significantly affect the motion performance of the main vibration system. The Brock's approaching zero method was improved as approaching the fixed point frequency method.
Hongliang Tian, Xixiao Liang, Xuan Du
doaj   +1 more source

Model Predictive Control of a Wave Energy Converter with Discrete Fluid Power Power Take-Off System

Energies, 2018
Wave power extraction algorithms for wave energy converters are normally designed without taking system losses into account leading to suboptimal power extraction.
Anders Hedegaard Hansen, Magnus F. Asmussen, Michael M. Bech   +2 more
doaj   +1 more source

Research on vibration reduction performance of dynamic vibration absorber based on damping characteristic of a new material

Advances in Mechanical Engineering, 2020
The absorbing effect of traditional dynamic vibration absorber (TDVA) is satisfactory only when the natural frequency is close to the excitation frequency.
Weizhi Song, Zhien Liu, Chihua Lu, Yongchao Li, Bin Li   +4 more
doaj   +1 more source

Strong Disorder Fixed Point in Absorbing-State Phase Transitions [PDF]

Physical Review Letters, 2003
The effect of quenched disorder on non-equilibrium phase transitions in the directed percolation universality class is studied by a strong disorder renormalization group approach and by density matrix renormalization group calculations. We show that for sufficiently strong disorder the critical behaviour is controlled by a strong disorder fixed point ...
Hooyberghs, Jef, Igloi, Ferenc, Vanderzande, Carlo   +2 more
openaire   +3 more sources

Effectiveness of a Novel Low‐Density Lipoprotein Apheresis Device Rheocarna in Patients Undergoing Hemodialysis With Chronic Limb‐Threatening Ischemia: A Single‐Center Retrospective Study

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Chronic limb‐threatening ischemia (CLTI) is a severe form of lower‐extremity artery disease characterized by distal lesions and microcirculatory impairment, limiting revascularization efficacy. Rheocarna is a direct hemoperfusion low‐density lipoprotein (LDL) adsorption device with potential rheological and anti‐inflammatory ...
Kunihiro Ishioka, Takayasu Ohtake, Kei Ohmori, Chika Shibuya, Tomoki Tsukahara, Mizuki Yamano, Yasuhiro Mochida, Machiko Oka, Kyoko Maesato, Yusuke Tsukamoto, Hidekazu Moriya, Sumi Hidaka, Shuzo Kobayashi   +12 more
wiley   +1 more source

Investigation on parametrically excited motions of point absorbers in regular waves [PDF]

Ocean Engineering, 2014
Free floating objects, such as a self reacting wave energy converter (WEC), may experience a condition known as parametric resonance. In this situation, at least two degrees of freedom become coupled when the incident wave train has a frequency approximately twice the pitch or roll natural frequency.
Kevin R. Tarrant, Craig Meskell
openaire   +2 more sources