Results 71 to 80 of about 452,637 (291)

LOW FREQUENCY DAMPER [PDF]

INCAS Bulletin, 2009
The low frequency damper is an autonomous equipment for damping vibrations with the 1-20Hz range.Its autonomy enables the equipment to be located in various mechanical systems, without requiring special hydraulic installations.The low frequency damper ...
Radu BOGATEANU, Bogdan DOBRESCU, Dan ABABEI, Viorica ILINOIU, Ion NILA   +4 more
doaj   +1 more source

The Relativistic Precession Model for QPOs in Low Mass X-ray Binaries [PDF]

, 2000
The relativistic precession model for quasi periodic oscillations, QPOs, in low mass X-ray binaries is reviewed. The behaviour of three simultaneous types of QPOs is well matched in terms of the fundamental frequencies for geodesic motion in the strong ...
Stella, L.
core   +3 more sources

A Robust Adaptive One‐Sample‐Ahead Preview Super‐Twisting Sliding Mode Controller

International Journal of Adaptive Control and Signal Processing, EarlyView.
Block Diagram of the Robust Adaptive One‐Sample‐Ahead Preview Super‐Twisting Sliding Mode Controller. ABSTRACT This article introduces a discrete‐time robust adaptive one‐sample‐ahead preview super‐twisting sliding mode controller. A stability analysis of the controller by Lyapunov criteria is developed to demonstrate its robustness in handling both ...
Guilherme Vieira Hollweg, Paulo Jefferson Dias de Oliveira Evald, Shivam Chaturvedi, Hilton Abilio Gründling, Rodrigo Varella Tambara, Wencong Su   +5 more
wiley   +1 more source

Small-Signal Model and Stability Control for Grid-Connected PV Inverter to a Weak Grid

Energies, 2021
This paper presents a small signal stability analysis to assess the stability issues facing PV (photovoltaic) inverters connected to a weak grid. It is revealed that the cause of the transient instabilities, either high-frequency or low-frequency ...
Antoine Musengimana, Haoyu Li, Xuemei Zheng, Yanxue Yu   +3 more
doaj   +1 more source

Bistable Mechanisms 3D Printing for Mechanically Programmable Vibration Control

Advanced Engineering Materials, EarlyView.
This work introduces a 3D‐printed bistable mechanism integrated into tuned mass dampers (TMDs) for mechanically adaptive passive vibration suppression. Through optimized geometry, the bistable design provides adaptable vibration reduction across a broad range of scenarios, achieving effective vibration mitigation without complex controls or external ...
Ali Zolfagharian, Frédéric Demoly, Mohammad Lakhi, Bernard Rolfe, Mahdi Bodaghi   +4 more
wiley   +1 more source

QPOs in Cataclysmic Variables and in X-ray Binaries [PDF]

, 2005
Recent observations, reported by Warner and Woudt, of Dwarf Nova Oscillations (DNOs) exhibiting frequency drift, period doubling, and 1:2:3 harmonic structure, can be understood as disc oscillations that are excited by perturbations at the spin frequency
Abramowicz, Abramowicz, B. Warner, Belloni, Cui, Hameury, J.-P. Lasota, Kato, Kato, King, Kluzniak, Kluzniak, Lasota, Lee, M. A. Abramowicz, Maitra, Mauche, Michelson, Psaltis, Remillard, Rezzolla, Rubio-Herrera, Schoembs, Schreiber, Sion, Strohmayer, van der Klis, W. Kluźniak, Wagoner, Wijnands, Wijnands, Woudt, Zhang   +32 more
core   +4 more sources

Evaluation of the Potential of Laser Shock Peening Compared with Cold Expansion for Improving Fatigue Resistance of Riveted Lap Joints of Aerospace Grade 7175 Al Alloy

Advanced Engineering Materials, EarlyView.
This study investigates laser shock peening for enhancing fatigue performance of riveted aerospace aluminum joints. A comparative approach with cold expansion combines fatigue testing and synchrotron X‐ray methods. Integrating mechanical testing with residual stress and strain characterization provides insights into how different treatments affect the ...
Ogün Baris Tapar, David Osman Busse, Maximilian Sprengel, Domenico Furfari, Marc‐André Nielsen, Guilherme Abreu Faria, Jérémy Epp   +6 more
wiley   +1 more source

Low frequency oscillations of the magnetosphere [PDF]

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
Sudden pulses in the model solar wind sets the Earth's magnetosphere into damped oscillatory motions. A simple model is capable of explaining many of the basic properties of these oscillations, giving scaling laws for their characteristics in terms of the parameters of the problem, such as the Solar wind momentum density. The period of the oscillations,
Borve, Steiner, Sato, Hiroatsu, Pecseli, Hans, Trulsen, Pecseli   +3 more
openaire   +2 more sources

On the Lightweight Potential of Laser Additive Manufactured NiTi Triply Periodic Minimal Sheet Lattices

Advanced Engineering Materials, EarlyView.
This study explores the lightweight potential of laser additive‐manufactured NiTi triply periodic minimal surface sheet lattices. It systematically investigates the effects of relative density and unit cell size on surface quality, deformation recovery, compression behavior, and energy absorption.
Haoming Mo, Shuo Qu, Shiming Gao, Xu Song   +3 more
wiley   +1 more source

Identification of Low Frequency Oscillations Based on Multidimensional Features and ReliefF-mRMR

Energies, 2019
Low frequency oscillations (LFOs) in power systems usually fall into two types, i.e., forced oscillations and natural oscillations. Waveforms of the two are similar, but the suppression methods are different.
Shuang Feng, Jianing Chen, Yi Tang
doaj   +1 more source