Results 1 to 10 of about 433,714 (266)

Minimum Quantity Lubrication Jet Noise: Passive Control [PDF]

Micromachines, 2023
Jet noise is a common problem in minimum quantity lubrication (MQL) technology. This should be given great attention because of its serious impacts on the physical and mental health of the operators.
Xiaodong Hu, Junhao Yu, Yuanlong Li, Yu Xia, Xuefeng Xu, Ruochong Zhang   +5 more
doaj   +2 more sources

Passive Control in a Continuous Beam under a Traveling Heavy Mass: Dynamic Response and Experimental Verification [PDF]

Sensors
The motion of a heavy mass on a bridge span causes vibrations whose magnitude and frequency content depend on the mechanical properties of the structural system, including the magnitude of that mass and its speed of traverse. In order to limit vibrations
George D. Manolis, Georgios I. Dadoulis
doaj   +2 more sources

A Simple Critical Response Evaluation Method for Base-Isolation Building-Connection Hybrid System Under Double Impulse as Representative of Near-Fault Ground Motion

Frontiers in Built Environment, 2021
We revisit a unique building system including a base-isolation, building-connection hybrid control system. The base-isolation system withstands pulse-type earthquake ground motions effectively and the building-connection system resists long-duration ...
Tomoya Nakamura, Kohei Fujita, Izuru Takewaki   +2 more
doaj   +1 more source

Fluid–Structure Interaction Analysis of a Wind Turbine Blade with Passive Control by Bend–Twist Coupling

Energies, 2023
The idea of improving the energy output for small wind turbines without compromising the remaining aspects of the technology, such as costs and structural integrity, is very appealing in the context of the growing concern for global warming and the goal ...
Jorge Mario Tamayo-Avendaño, Ivan David Patiño-Arcila, César Nieto-Londoño, Julián Sierra-Pérez   +3 more
doaj   +1 more source

Krasovskii and Shifted Passivity-Based Control [PDF]

IEEE Transactions on Automatic Control, 2021
In this paper, our objective is to develop novel passivity based control techniques by introducing a new passivity concept named Krasovskii passivity. As a preliminary step, we investigate properties of Krasovskii passive systems and establish relations among four relevant passivity concepts including Krasovskii passivity.
Yu Kawano, Krishna Chaitanya Kosaraju, Jacquelien M. A. Scherpen   +2 more
openaire   +3 more sources

Evaluation and Comparison of SEA Torque Controllers in a Unified Framework

Actuators, 2023
Series elastic actuators (SEA) with their inherent compliance offer a safe torque source for robots that are interacting with various environments, including humans.
Wolfgang Rampeltshammer, Arvid Keemink, Menno Sytsma, Edwin van Asseldonk, Herman van der Kooij   +4 more
doaj   +1 more source

Effect of a Control Mechanism on the Interaction between a Rectangular Jet and a Slotted Plate: Experimental Study of the Aeroacoustic Field

Fluids, 2023
The aeroacoustic field of a rectangular subsonic jet impinging on a slotted plate was investigated experimentally using microphones and stereoscopic particle image velocimetry (S-PIV).
Nour Eldin Afyouni, Marwan Alkheir, Hassan Assoum, Bilal El Zohbi, Kamel Abed-Meraim, Anas Sakout, Mouhammad El Hassan   +6 more
doaj   +1 more source

Controlled symmetries and passive walking [PDF]

IEEE Transactions on Automatic Control, 2002
In this note, we investigate the relationship between nonlinear control and passive walking in bipedal locomotion for the general case of an n degree-of-freedom biped in three dimensional space. We introduce the notion of controlled symmetry to capture the effect of the control input on the invariance of the system Lagrangian under group action.
Mark W. Spong, Francesco Bullo
openaire   +1 more source

Suppression of Vortex-Induced Vibration and Phase-Averaged Analysis of the Wake Generated by a Circular Cylinder Covered with Helical Grooves

Fluids, 2022
The effect of triple helical grooves on the suppression of vortex-induced vibration (VIV) of a circular cylinder was investigated experimentally in a wind tunnel over Reynolds number in the range of 1 × 104 < Re < 4 × 104.
Zhiyong Hao, Chenlin Sun, Yucen Lu, Kaiming Bi, Tongming Zhou   +4 more
doaj   +1 more source

Generation and Mitigation Mechanism Studies of Nonlinear Thermoacoustic Instability in a Modelled Swirling Combustor with a Heat Exchanger

Aerospace, 2021
In the present work, 3D Unsteady Reynolds-Averaged Navier-Stokes (URANS) simulations are performed to investigate the generation and mitigation mechanism of combustion-sustained thermoacoustic instabilities in a modelled swirl combustor.
Yuze Sun, Dan Zhao, Xiaowei Zhu
doaj   +1 more source