Results 191 to 200 of about 3,882,562 (249)

Micro/Nanoscale Acoustic Manipulation: From Particle Control to Autonomous Microswimmers

Advanced Science, EarlyView.
This conceptual framework illustrates acoustic technology as a multifunctional platform enabling passive particle manipulation across scales and autonomous propulsion of microswimmers. ABSTRACT Acoustic manipulation and propulsion technologies have emerged as powerful platforms for micro/nanoscale control, enabled by their non‐contact operation, label ...
Jiahui Chu, Lemin Zhang, Xu Wang, Wenzong Li, Yahua Liu   +4 more
wiley   +1 more source

Passive Metasurface Tweezers for Multi‐Scale Orbital Transport and Trapping on Elastic Plates

Advanced Science, EarlyView.
Passive labyrinthine phase encoding converts single‐channel excitation into localized flexural‐wave vortices with programmable orbital angular momentum. The resulting vortex fields enable cross‐scale particle manipulation, including orbital transport, central confinement, and rotational actuation.
Zeyang Bi, Zhiqiang Li, Yunkang Ren, Yugui Peng, Xuefeng Zhu, Liuxian Zhao, Jun Yang, Chuanxing Bi   +7 more
wiley   +1 more source

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Damping Effect of Virtual Synchronous Machines Provided by a Dynamical Virtual Impedance

IEEE Transactions on Energy Conversion, 2021
Virtual synchronous machines (VSMs) emulate the swing equation for grid synchronization and inertia provision. Usually, a large damping coefficient is necessary in VSMs to provide equivalent damper winding effect, which is, however, not aligned with the fact that the physical swing equation of synchronous generators (SGs) contains only a small ...
Huanhai Xin, Ping Ju, Guanzhong Wang
exaly   +2 more sources

A Novel Virtual Impedance Method for Interfacing Renewable to Grid with High Impedance

2023 IEEE PES Innovative Smart Grid Technologies - Asia (ISGT Asia), 2023
Currently, grid-following inverter (GFL) has become a vital component in the integration of renewable energy sources into power grids. A Modified Virtual Impedance - Phase Locked Loop (MVI-PLL) method is proposed to address instability problems that occur when using a PLL under high grid impedance conditions in GFL.
Phuoc Sang Nguyen, Ghavameddin Nourbakhsh, Gerard Ledwich   +2 more
openaire   +3 more sources

Impedance control with virtual compliance

Proceedings of the Third International Workshop on Robot Motion and Control, 2002. RoMoCo '02., 2003
In the paper a new concept of impedance control for a simple 1D dynamical system has been presented. The new approach lies in treating a task of reaching a contact plane and generating desired force on environment as one control problem that can be realized by one coherent control equation.
P. Dutkiewicz, M. Michalek
openaire   +1 more source

Virtual impedance design of virtual synchronous generation in microgrid

2014 International Power Electronics and Application Conference and Exposition, 2014
The adoption of virtual synchronous generation (VSG) control can maintain the stability of voltage and frequency in power electronic interfaced mircogrid. In this paper virtual impedance is added to the VSG control strategy in order to improve the system control performance in resistive-inductive line impedance, the influence of virtual impedance on ...
Chao Hu, Fang Liu, Haizhen Xu, Rongliang Shi, Lei Tao   +4 more
openaire   +1 more source

Virtual impedance control for preshaping of a robot hand

Proceedings of the 41st SICE Annual Conference. SICE 2002., 2003
A simple and fast virtual impedance control algorithm is presented for a dexterous robot hand to perform the complex preshaping and grasping movements. This algorithm integrates two conflict impedances for the fingers to separate between each other during approaching to grasp the object.
Luo, Zhi-wei, Ito, Takahiro, Sugimoto, Noritune, Odashima, Tadashi, Hosoe, Shigeyuki   +4 more
openaire   +1 more source

Object shape virtualization in impedance tomography

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2009
PurposeThe purpose of this paper is to introduce a method for increasing imaging quality in impedance tomography. The paper presents an optical method of shape virtualization, processing algorithm draft and results of virtualization for sample objects.Design/methodology/approachIn impedance tomography the image reconstruction algorithms must yield ...
Tomasz Grzywacz, Jan Sikora, Stefan Wójtowicz   +2 more
openaire   +1 more source

Virtual Impedance Analyzer Design and Implementation

Second International Conference on Innovative Computing, Informatio and Control (ICICIC 2007), 2007
In this research, the structure and design of virtual impedance analyzers are studied. The construction process is also described and introduced. This programmable virtual impedance analyzer is achieved by software part, Labview, hardware part, DAQ card and some external circuits.
Kai-chao Yao, Chin-wen Liao, Li-ling Chao, Fu-yu Lin   +3 more
openaire   +1 more source

Virtual Impedance Method for Mutual Coupling Compensation

IEEE Transactions on Antennas and Propagation, 2021
The radiation pattern of an antenna within an array environment is modified by mutual coupling to neighboring elements, which can create unknown phase and amplitude variation on the order of 10° and 5 dB. This uncertainty in the element patterns results in beamforming errors, which can be particularly problematic for applications requiring precise ...
Carl Pfeiffer, Fikadu Dagefu, Boris Tomasic, Jeffrey N. Twigg, Bae-Ian Wu   +4 more
openaire   +1 more source