Results 91 to 100 of about 18,440 (267)

Energy decay of a variable-coefficient wave equation with nonlinear time-dependent localized damping

Electronic Journal of Differential Equations, 2015
We study the energy decay for the Cauchy problem of the wave equation with nonlinear time-dependent and space-dependent damping. The damping is localized in a bounded domain and near infinity, and the principal part of the wave equation has a variable-
Jieqiong Wu, Fei Feng, Shugen Chai
doaj  

Damping of spin waves

Physical Review Research
We show that, in ideal-spin hydrodynamics, the components of the spin tensor follow damped wave equations. The damping rate is related to nonlocal collisions of the particles in the fluid, which enter at first order in ℏ in a semiclassical expansion.
Wagner, David, Shokri, Masoud, Rischke, Dirk H.   +2 more
openaire   +4 more sources

Nonlocomotory Robotic Strategies for Dynamic Rotation Control in Terrestrial Robots: A Review

Advanced Robotics Research, EarlyView.
Terrestrial robots increasingly require rapid body rotation to maintain stability and agility in complex environments. This review shows nonlocomotory rotational control strategies that operate without ground contact, including reaction wheels, tails, bars, limbs, and thrusters.
Y. Liang, J. An, X. Zheng, D. Wang, S. Wang, X. Wang, P. Zhu, J. Pei, S. Li, J. Paripurana, Y. Han, Z. Tang, X. Gan, Q. He, X. Ma   +14 more
wiley   +1 more source

Acoustic wave damping anisotropy in nematic liquid crystals

Archives of Acoustics, 2014
This paper presents the results of damping and velocity measurements of an ultrasonic wave with 5 MHz frequency performed in two nematic liquid crystals: pentylcyanobiphenyl (PCB) and 4-n-methoxybenzoate-4-n-pentylphenyl. Measurements were carried out in
H. HERBA, A. DRZYMAŁA
doaj  

MPPT Reactive Control Algorithm for Heaving Wave Energy Converters With Power Setpoint Capabilities

IEEE Access
Reactive control is a popular method for maximizing wave energy absorption in wave energy converters (WECs). This technique involves adjusting the damping and stiffness coefficients of the WEC to align its natural frequency with the frequency of incoming
Abdin Y. Elamin, Addy Wahyudie, Tuanku Badzlin Hashfi, Hussain Shareef, Rachid Errouissi, Mohammad Shakeel Laghari, Marizan Binti Mubin, Saad Mekhilef   +7 more
doaj   +1 more source

Multimodal Locomotion in Insect‐Inspired Microrobots: A Review of Strategies for Aerial, Surface, Aquatic, and Interfacial Motion

Advanced Robotics Research, EarlyView.
This review identifies key design considerations for insect‐inspired microrobots capable of multimodal locomotion. To draw inspiration, biological and robotic strategies for moving in air, on water surfaces, and underwater are examined, along with approaches for crossing the air–water interface.
Mija Jovchevska, Kaushik Jayaram, Nicole Xu   +2 more
wiley   +1 more source

Memory-Kernel Damping in Wave Propagation from a Variational Reservoir Model: Dispersion, Stability, and Fractional Regimes

Fractal and Fractional
Hereditary damping and fractional attenuation are widely used to model wave propagation in complex media, but the variational and spectral origin of the corresponding nonlocal-in-time operators is often left implicit.
Derik W. Gryczak, Gabriel G. da Rocha, Aloisi Somer, Luiz R. Evangelista, Ervin K. Lenzi   +4 more
doaj   +1 more source

Waveguide Photoactuators: Materials, Fabrication, and Applications

Advanced Robotics Research, EarlyView.
Waveguide photoactuators convert guided light into mechanical motion. Their tethered‐flexible design enables minimally invasive surgery and confined‐space robotics. This review aims to guide materials selection, device design, and system integration, accelerating the transition of waveguide photoactuators from laboratory prototypes to versatile ...
Minjie Xi, Hemin Pan, Yang Zong, Yongfeng Mei, Jizhai Cui   +4 more
wiley   +1 more source

Dynamic Response of 3D Concrete Beams with Coated Aggregates Under Wave Propagation Induced by Piezoelectric Actuators: A Simulation Study

Buildings
This research investigates the dynamic response of three-dimensional concrete beams with coated aggregates subjected to transient wave propagation induced by piezoelectric actuators (PZT-lead zirconate titanate).
Yisihak Gebre Tarekegn, Tom Lahmer, Abrham Gebre Tarekegn   +2 more
doaj   +1 more source

Backpropagation Through Soft Body: Investigating Information Processing in Brain–Body Coupling Systems

Advanced Robotics Research, EarlyView.
This study explores how information processing is distributed between brains and bodies through a codesign approach. Using the “backpropagation through soft body” framework, brain–body coupling agents are developed and analyzed across several tasks in which output is generated through the agents’ physical dynamics.
Hiroki Tomioka, Katsuma Inoue, Yasuo Kuniyoshi, Kohei Nakajima   +3 more
wiley   +1 more source