Results 111 to 120 of about 48,228 (306)

Research on Doubly-Fed Wind Turbine Shaft System With Virtual Inertia for Torsional Vibration Analysis

发电技术
ObjectivesShafting mathematical model of wind turbine is the basis of torsional vibration characteristics analysis. Shafting model is very important for the reliability of analysis results.
SUN Zhenglong, SAN Jiqiang
doaj   +1 more source

Multi-Objective Optimization Design and Performance Comparison of Magnetorheological Torsional Vibration Absorbers of Different Configurations. [PDF]

Materials (Basel), 2023
Liu G, Hu H, Ouyang Q, Zhang F.
europepmc   +1 more source

Pulsating magneto-dipole radiation of a quaking neutron star powered by energy of Alfven seismic vibrations

, 2011
We compute the characteristic parameters of magnetic dipole radiation of a neutron star undergoing torsional seismic vibrations under the action of Lorentz restoring force about axis of a dipolar magnetic field experiencing decay.
Abramowitz, Bastrukov, Irina Molodtsova, Jun-Wei Yu, Kouveliotou, Ledoux, Manchester R. N., Mereghetti, Pacini, Polyanin, Qiao, Ren-Xin Xu, Sergey Bastrukov, Weber, Xu, Xu   +15 more
core   +1 more source

Preliminary instability-analysis of deepwater riser with fairings [PDF]

, 2009
Instability of deepwater riser with fairings is investigated in this study. Despite the advantages over other devices for suppressing vortex-induced-vibration (VIV), fairings may be susceptible to flutter type instability.
Huang, Shan, Khorasanchi, Mahdi
core   +1 more source

Deciphering Intricacies in Directional CO2 Conversion From Electrolysis to CO2 Batteries

Advanced Energy Materials, EarlyView.
This review will delve into the inherent connections and distinctions of CO2‐directed conversion in ECO2RR and CO2 batteries, in terms of product types, catalyst selection, catalytic mechanisms, and electrochemical performances, while proposing a benchmarking framework for the evaluation of CO2 batteries and innovative CO2 battery configurations for ...
Changfan Xu, Huaping Zhao, Lizhuang Chen, Weidong Shi, Guosheng Shao, Yong Lei   +5 more
wiley   +1 more source

LQR Control of Axial-Torsional Bidirectional Vibration of Drill String in Oil and Gas Wells

Shiyou jixie
To effectively solve the failure problem induced by axial-torsional bidirectional vibration of drill string， with the help of the 3-DOF dynamics model of drill pipe， a simulation study was performed on the suppression of linear quadratic regulator （LQR ...
Li Xinye, Zhang Wenbo, Guo Xiaoqiang, Zhang Wenxue, Ye Chengyang   +4 more
doaj   +3 more sources

Optimization of the Input Shaft Torsional Amplitude of a DCT Gearbox

Jixie chuandong
Torsional vibration of the automobile transmission system may cause roar or abnormal noise in the car. Torsional vibration excitation generally comes from the main order of the engine and is transmitted to the gearbox through torsional vibration damper ...
Zhang Guihui, Shi Lei, Ma Junming, Wang Xiangwen, Sun Hongming, Dong Liyun   +5 more
doaj  

Torsional Vibration Tests of Extruded Polystyrene with Improved Accuracy in Determining the Shear Modulus. [PDF]

Polymers (Basel), 2022
Yoshihara H, Wakahara M, Yoshinobu M, Maruta M.   +3 more
europepmc   +1 more source

Underreamer mechanics [PDF]

, 2009
In the oil and gas industry, an underreamer is a tool used to extend and enlarge the diameter of a previously-drilled bore. The problem proposed to the Study Group is to obtain appropriate mathematical models of underreamer dynamics, in forms that will ...
Barton, David, Coskun, Erhan, Hall, Cameron, Jones, Marvin, Lacey, Andrew, Lorenz, Maike, Maringer, Johannes, Please, Colin, Richardson, Giles   +8 more
core  

Anomaly of the Internal Friction in the Helium Crystals Grown in the Burst-like Growth Mode

, 2014
The internal friction in the crystals grown in two modes, namely, slow and anomalously fast (burst-like growth) modes, is measured in the temperature range 0.49-0.75K at a frequency of about 75kHz.
Tsymbalenko, V. L.
core   +1 more source