Results 21 to 30 of about 2,952,202 (230)

Self-Powered All-in-One Wearable Bioelectronics Driven by Pneumatic Energy Buffering of Daily Footsteps. [PDF]

Adv Sci (Weinh)
A pneumatic energy‐buffering strategy transforms transient and intermittent footsteps into quasi‐continuous electrical energy for a self‐powered wearable biosensing platform. The footwear‐integrated air‐pumping harvester, combined with the rationally designed power‐management system, powers a wearable ankle PPG device with reduced motion artifacts ...
Kim JS, Kang TW, Yoo H, Ha J, Huang Y, Han H, Ahn CW, Yeo WH, Oh IK.   +8 more
europepmc   +2 more sources

Model Development and Stability Analysis for a Turbocharger Rotor System under Multi-Field Coupled Forces [PDF]

, 2012
Automotive turbochargers have been widely applied in vehicles in order to increase the power output of internal combustion engines by increasing the air to fuel ratio entering the piston cylinders.
Zhang, Hao
core   +3 more sources

Experimental Study on the Effect of the Blade Tip Distance on the Power and the Wake Recovery with Small Multi-Rotor Wind Turbines

Journal of Marine Science and Engineering, 2023
In order to investigate the output power and wake velocity of small multi-rotor wind turbines compared to single-rotor wind turbines, which operate in the same swept area at various blade tip distances, this paper used the wind tunnel test method to ...
Sen Gong, Kai Pan, Hua Yang, Junwei Yang
doaj   +1 more source

Multi-Timescale Control of Variable-Speed Wind Turbine for Inertia Provision

Applied Sciences, 2022
The increasing deployment of power converters has led to a significant reduction in the power system inertia and consequently resulted in frequency stability issues.
Zixiao Xu, Yang Qi, Weilin Li, Yongheng Yang   +3 more
doaj   +1 more source

Fast Frequency Response of a Doubly-Fed Induction Generator for System Inertia Support

Applied Sciences, 2020
Converter-interfaced doubly-fed induction generators (DFIGs) can provide short-term frequency support (STFS) capability by releasing rotating kinetic energy.
Dejian Yang, Hong-Chao Gao, Lei Zhang, Jingjiao Li, Xinsong Zhang, Liang Hua   +5 more
doaj   +1 more source

Research on primary frequency regulation strategies for ancillary wind power inertia based on the rotor kinetic energy

Frontiers in Energy Research, 2023
The additional frequency control of wind turbines is an effective method to solve the problem of low inertia in power systems with high proportions of new energy.
Li Sun, Peihong Yang, Hui Jiang, Yanfang Xu, Lan Kang, Xiuyan Lu   +5 more
doaj   +1 more source

Rotor integrity design for a high-speed modular air-cored axial-flux permanent-magnet generator [PDF]

, 2011
The rotor integrity design for a high-speed modular air-cored axial-flux permanent-magnet (AFPM) generator is presented. The main focus is on the mechanical parametric optimization of the rotor, which becomes a more dominating design issue over ...
Luk, Patrick Chi-Kwong, El-Hasan, T. S., P. C. K. Luk, Fei, Wei-Zhong, W. Fei, T. S. El-Hasan   +5 more
core   +1 more source

Aerodynamic Performance and Wake Characteristics Analysis of Archimedes Spiral Wind Turbine Rotors with Different Blade Angle

Energies, 2022
Continuous improvement of wind turbines represent an effective way of achieving green energy and reducing dependence on fossil fuel. Conventional lift-type horizontal axis wind turbines, which are widely used, are designed to run under high wind speed to
Ke Song, Huiting Huan, Yuchi Kang
doaj   +1 more source

Speed Tracking for IFOC Induction Motor Speed Control Using Hybrid Sensorless Speed Estimator Based on Flux Error for Electric Vehicles Application

Machines, 2022
This paper presents hybrid sensorless speed tracking by an indirect field-oriented control (IFOC) for an induction motor (IM). The sensorless model is based on an improved virtual estimation topology model to predict the virtual speed and flux of the IM ...
Muhamad Syazmie Sepeeh, Shamsul Aizam Zulkifli, Sy Yi Sim, Huang-Jen Chiu, Mohd Zamri Che Wanik   +4 more
doaj   +1 more source

Short-Term Frequency Response of a DFIG-Based Wind Turbine Generator for Rapid Frequency Stabilization

Energies, 2017
This paper proposes a short-term frequency-response scheme of a doubly-fed induction generator (DFIG)-based wind turbine generator (WTG) for improving rotor speed recovery and frequency nadir.
Dejian Yang, Moses Kang, Eduard Muljadi, Wenzhong Gao, Junhee Hong, Jaeseok Choi, Yong Cheol Kang   +6 more
doaj   +1 more source