Results 31 to 40 of about 2,094 (200)

An Anomaly Detection Method for Sliding Bearings Under Electromagnetic Interference Based on an Asymmetric Autoencoder and a Dual-Indicator Diagnostic Plane

Machines
As core components of marine power systems, sliding bearings directly affect the operational safety of ships. To address the challenges that early weak anomaly features of sliding bearings are easily masked by electromagnetic interference (EMI) and that ...
Xiangdong Yu, Wuchao Chen, Zongpeng Tong, Shuai Dong, Haiyan Qiang   +4 more
doaj   +1 more source

Tribology in Marine Diesel Engines

, 2022
This chapter deals with the tribology of marine diesel engines. Several types of diesel engines have been installed and used in the engine room of marine ships. Some of them, used for propulsion, operate at low-speed in a two-stroke combustion process in conjunction with propellers.
openaire   +2 more sources

One hundred years of teaching, research, and innovation in chemical engineering at the Faculty of Chemistry, National Autonomous University of Mexico (UNAM): Birthplace and enduring leadership of the discipline in Mexico

The Canadian Journal of Chemical Engineering, EarlyView.
The teaching of chemical engineering in Mexico started in 1925 at the Faculty of Chemistry (FQ) of the National Autonomous University of Mexico (UNAM). Academic institutions, research centres, chemical companies, technological developments, highly trained personnel, and scientific contributions are part of the legacy from FQ‐UNAM.
Patricia Pérez‐Salinas, Alberto Rosas‐Aburto, Martín G. Hernández‐Luna, Aida Gutiérrez‐Alejandre, Eduardo Vivaldo‐Lima   +4 more
wiley   +1 more source

Friction and Wear Behavior of Carburized Steels Against Ceramic Balls Under Starved Lubrication

Lubricants
Starved lubrication poses a critical challenge to hybrid ceramic bearings operating under severe conditions. This study investigates the tribological behavior of carburized 20CrMo steel sliding against Al2O3 ceramic balls and GCr15 steel balls under dry ...
Xu Liu, Linye Yu, Ming Zhong, Jin Qian, Jiapeng Dai, Yongan Min   +5 more
doaj   +1 more source

Carbon emission assessment of tunnel infrastructures: From construction to operation

Deep Underground Science and Engineering, EarlyView.
This study develops a lifecycle carbon accounting framework for tunnel infrastructures, covering design, construction, operation, maintenance, and dismantling. Applied to a subsea tunnel case, the framework reveals the carbon emission distribution among four typical tunnel types and highlights potential carbon offset methods for low‐carbon tunnel ...
Luyuan Long, Wout Broere, Xuehui Zhang, Tian Xia, Richard de Nijs   +4 more
wiley   +1 more source

Recent Advances of Perovskite Oxides for Air Pollution Control Chemistry: The Closed Loop From Design to Application

EcoEnergy, EarlyView.
This review summarizes a descriptor‐guided framework for linking theoretical calculations, in situ/operando characterization, synthesis regulation, and application screening in functional materials. Emphasis is placed on dynamic structure–property relationships that enable low‐cost material design with enhanced activity, stability, and environmental ...
Yanyu Jin, Zezheng Tang, Hengfan Wu, Xing Yuan, Zongxiang Yang, Weijia An, Wenquan Cui, Xianguang Meng, Ying Xu, Junhua Li   +9 more
wiley   +1 more source

PID controller parameter optimization for ship fin stabilizers based on an improved secretary bird optimization algorithm

Scientific Reports
Fin stabilizers governed by proportional-integral-derivative (PID) controllers dominate active ship roll reduction, yet their performance depends critically on gain tuning under nonlinear hydrodynamics and time-varying sea states.
Linchang Ye, Yun Liu, Jifu Guo, Miao Zhang, Dong Zhang, Zongpeng Tong, Jianping Shen   +6 more
doaj   +1 more source

A Novel Modular Multi-Unit Cell Permanent Magnet Thrust Bearing with Bionic Design and Load-Carrying Capacity Analysis

Applied Sciences
Permanent magnet thrust bearings have garnered significant attention due to their high rotational speeds, low noise levels, and excellent vibration-damping performance.
Xiangdong Yu, Qi Wang, Zhongsheng Yan, Wenfeng Yu, Xingyue Shang, Suimeng Zhou, Jimin Zhang   +6 more
doaj   +1 more source

Techno-Environmental Evaluation of a Liquefied Natural Gas-Fuelled Combined Gas Turbine with Steam Cycles for Large Container Ship Propulsion Systems

Energies, 2022
Restrictions on emissions are being imposed by regional and international shipping organisations, which raise the question of which marine fuel and technology can most effectively replace heavy fuel oil and diesel engines.
Abdulaziz M. T. Alzayedi, Suresh Sampath, Pericles Pilidis   +2 more
doaj   +1 more source

Simulation of the dynamics of a marine diesel engine [PDF]

Journal of Marine Engineering & Technology, 2009
This paper presents a simulation model of a turbocharged four-stroke diesel engine with eight cylinders in transient conditions, attached to a propulsion system. Having an engine model that is accurate but not complicated is desirable when working with on-board diagnosis or engine control. The model presented here is relatively simple, but sufficiently
Carmen Maftei, Lúcia Moreira, C Guedes Soares   +2 more
openaire   +1 more source