Results 1 to 10 of about 22,474,821 (353)
On the use of a Stress-Impedance Model to describe sound propagation in a lined duct with grazing flow [PDF]
Journal of the Acoustical Society of America, 2017 With flow, the acoustical effect of a lined wall cannot be described by a single quantity like the wall impedance. At least two quantities are required. In addition to the impedance, the unsteady tangential force exerted by the wall on the flow has to be
Aurégan, Yves
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IEEE Access, 2020 A variable impedance skill transfer framework is introduced and experimentally evaluated in this article. This framework mainly includes the following: 1.
Rui Wu, He Zhang, Jie Zhao
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Modelling Turbine Acoustic Impedance [PDF]
International Journal of Turbomachinery, Propulsion and Power, 2021 We quantify the sensitivity of turbine acoustic impedance to aerodynamic design parameters. Impedance boundary conditions are an influential yet uncertain parameter in predicting the thermoacoustic stability of gas turbine combustors. We extend the semi-actuator disk model to cambered blades, using non-linear time-domain computations of turbine vane ...
Brind, James, Pullan, Graham
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Zhongguo dianli, 2023 Based on impedance analysis, this paper focuses on the circulation control of a modular multilevel converter (MMC) and conducts in-depth research on the stability impact of offshore wind farm integration based on a permanent magnetic synchronous ...
Shuting YANG +3 more
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Frontiers in Energy Research, 2021 In the northwest of China, a strategy to transmit the wind-thermal–bundled power from the local grid and doubly fed induction generator (DFIG)–based wind farms through a voltage source converter–based HVDC (VSC-HVDC) can be widely applied. However, since
Kun Sun, Wei Yao, Cai Yan, Jinyu Wen
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Artificial Neural Network Based Identification of Multi-Operating-Point Impedance Model
IEEE transactions on power electronics, 2021 The black-box impedance model of voltage source inverters (VSIs) can be measured at their terminals without access to internal control details, which greatly facilitate the analysis of inverter-grid interactions.
Mengfan Zhang +3 more
semanticscholar +1 more source
Model Predictive Impedance Control [PDF]
2020 IEEE International Conference on Robotics and Automation (ICRA), 2020 Robots are more and more often designed in order to perform tasks in synergy with human operators. In this context, a current research focus for collaborative robotics lies in the design of high-performance control solutions, which ensure security in spite of unmodeled external forces.
Maciej Bednarczyk +2 more
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Control-Based Two-Layer Protection for Short-Circuit Fault at an LVDC Feeder Branch
Energies, 2022 Low-voltage dc distribution offers high efficiency for grid integration of dc-based technologies such as photovoltaic and battery storage systems and new loads such as charging stations for electric vehicles due to reduced number of conversion stages ...
Jiajun Yang +5 more
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Fractal and Fractional, 2021 The passive electrical properties of a biological tissue, referred to as the tissue bioimpedance, are related to the underlying tissue physiology. These measurements are often well-represented by a fractional-order equivalent circuit model, referred to ...
T. Freeborn, Shelby Critcher
semanticscholar +1 more source
Impedance Model Study of Duct Sound Liner under High Speed Airflow
Kongzhi Yu Xinxi Jishu, 2022 Micro perforation plate (MPP) sound liner is a very effective method to control pipe noise in high-speed airflow environment based on the principle of Helmholtz resonator. It generally has single layer, double-layer or even multi-layer structure.
YAN Meng +3 more
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