LQR Control of Axial-Torsional Bidirectional Vibration of Drill String in Oil and Gas Wells
Shiyou jixieTo 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 +4 more
doaj +3 more sources
Optimization of the Input Shaft Torsional Amplitude of a DCT Gearbox
Jixie chuandongTorsional 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 +5 more
doaj
Experiments on the extraction of blade vibration signature from the shaft torsional vibration signals [PDF]
, 2003 This paper presents experiment results that examine the validity of extracting blade vibration signature from the shaft torsional vibration signals. A special test rig was designed and manufactured for this objective. A set of strain gages were bonded to
Ghouti, L.
core +1 more source
Torsional Vibration Tests of Extruded Polystyrene with Improved Accuracy in Determining the Shear Modulus. [PDF]
Polymers (Basel), 2022 Yoshihara H +3 more
europepmc +1 more source
Advanced Electronic Materials, EarlyView.Composite‐based flexible electronics integrate biodegradable polymers, conductive networks, and multilayer device architectures to balance electrical performance, mechanical durability, and controlled degradation. Interfacial engineering and encapsulation regulate transport stability and operational lifetime, while programmed disassembly enables ...
Sayam, Sangho Cho
wiley +1 more source
Perilipin‐2‐Anchored Lipid Droplet‐Targeting Phototheranostics
Angewandte Chemie, EarlyView.This study reports two NIR theranostic dyes, C‐BDP‐OH and C‐BDP‐OMe. C‐BDP‐OMe targets lipid droplets via a dual‐anchoring mechanism with PLIN2, enabling wash‐free tumor imaging. With 62.6% photothermal conversion efficiency, it achieves tumor ablation by downregulating PLIN2, disrupting LD‐mitochondria crosstalk, and triggering apoptosis and ...
Lipeng Zhang +9 more
wiley +2 more sources
Torsional Vibration Characteristics Analysis of the Reciprocating Compressor’s Crankshaft System
Shiyou jixie, 2017 Crankshaft system is an important part of the reciprocating compressor, whose torsional vibration characteristic is an important factor that affects the reliability of the whole machine.
Sun Xiaodong +4 more
doaj
Application of a Thermo-Hydrodynamic Model of a Viscous Torsional Vibration Damper to Determining Its Operating Temperature in a Steady State. [PDF]
Materials (Basel), 2021 Homik W, Mazurkow A, Woś P.
europepmc +1 more source
Advanced Energy Materials, EarlyView.The molecular design strategy that integrates both side chain and backbone engineering in diketopyrrolopyrrole‐based conjugated polymers to identify the optimal balance between doping efficiency and microstructural order is demonstrated. Comprehensive spectroscopic, electrochemical, morphological, and structural characterizations reveal that the ...
Taewoong Han +13 more
wiley +1 more source
A Non‐Covalent [4Fe–4S]/[2Fe] Interface in HydF Guides [FeFe]‐Hydrogenase Maturation
Angewandte Chemie, EarlyView.Bridged or not? 57Fe NRVS reveals a non‐covalent, electronically coupled interaction between the HydF [4Fe–4S] cluster and the [2Fe] precursor. Boltz‐2 structure predictions suggest that the cubane organizes lipoate‐dependent Hmet chemistry, positioning intermediates for assembly of the CH2–NH–CH2 bridge during H‐cluster biosynthesis.
Giorgio Caserta +6 more
wiley +2 more sources