Results 11 to 20 of about 908,506 (299)

Linear and Nonlinear Performance Analysis of Hydrodynamic Journal Bearings with Different Geometries

Applied Sciences, 2022
In rotor dynamics, a traditional way of representing the dynamics of hydrodynamic bearings is using stiffness/damping coefficients. It is thus necessary to carry out a linearization of hydrodynamic forces around the shaft’s equilibrium position. However,
Carlos Alberto Alves Viana, Diogo Stuani Alves, Tiago Henrique Machado   +2 more
doaj   +1 more source

Study on the Forced Torsional Vibration Response of Multiple Rotating Blades with Underplatform Dampers

Aerospace, 2023
Underplatform dampers (UPDs), a type of dry friction damper, are commonly used for vibration reduction of turbine blades. This study investigated the effect of UPDs on the forced torsional vibration response of turbine blades within a multi-blade system.
Yanan Wu, Haijun Xuan, Changyao Wu, Dong Mi, Mingmin Qu, Tao Jin   +5 more
doaj   +1 more source

Human Factors Assessment of a Novel Pediatric Lower-Limb Exoskeleton

Robotics, 2023
While several lower-limb exoskeletons have been designed for adult patients, there remains a lack of pediatric-oriented devices. This paper presented a human factor assessment of an adjustable pediatric lower-limb exoskeleton for childhood gait ...
Anthony C. Goo, Jason J. Wiebrecht, Douglas A. Wajda, Jerzy T. Sawicki   +3 more
doaj   +1 more source

Design and Evaluation of a Pediatric Lower-Limb Exoskeleton Joint Actuator

Actuators, 2020
Lower-limb exoskeletons have undergone significant developments for aiding in the ambulation of adults with gait impairment. However, advancements in exoskeletons for the pediatric population have comparatively been lacking.
Anthony Goo, Curt A. Laubscher, Ryan J. Farris, Jerzy T. Sawicki   +3 more
doaj   +1 more source

Deposits on Bearing Pad Caused by Particulate Contamination in Turbine Oil

Tribology Online, 2015
Under severe bearing conditions, deposits form on the loaded part of bearing pads and if this happens excessively, it could lead to unacceptable rises in temperature and vibration.
Fumihiko Yokoyama, Yuka Iwama, Masahiro Maruyama, Mitsuo Sano   +3 more
doaj   +1 more source

Mathematical models of squeeze film dampers in rotor dynamics of gas turbine engines

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2017
The paper focuses on the choice of mathematical models of squeeze film dampers and methods of their numerical implementations for gas turbine engine rotor dynamics problems.
M. N. Kutakov, S. A. Degtiarev, M. K. Leontiev   +2 more
doaj   +1 more source

Identification Methods and Test Results for Tilting Pad and Fixed Geometry Journal Bearing Dynamic Coefficients – A Review

Shock and Vibration, 2009
Fluid film journal bearings (FFBs) are used to support high-speed rotors in turbomachinery which often operate above the rotor first bending critical speed.
T.W. Dimond, P.N. Sheth, P.E. Allaire, M. He   +3 more
doaj   +1 more source

Extracting Feature Information and its Visualization Based on the Characteristic Defect Octave Frequencies in a Rolling Element Bearing

Data Science Journal, 2007
Monitoring the condition of rolling element bearings and defect diagnosis has received considerable attention for many years because the majority of problems in rotating machines are caused by defective bearings.
Jianyu Lei, Mingfu Liao
doaj   +1 more source

Hard Solid Deposit Formation on Turbine Housing, Nozzle and Blades in Marine Use Turbocharger at the Elevated Temperature

Tribology Online, 2014
Hard solid deposit formation has been inevitable problem in marine use turbocharger, and many engineers have struggled with it for years. It is due to low quality fuel, and the deposit results in the deterioration of the performance.
Fumihiko Yokoyama, Yuka Iwama, Ken Nakano, Yutaka Hirata   +3 more
doaj   +1 more source

Rotating machinery anomaly detection using data reconstruction generative adversarial networks with vibration energy analysis

AIP Advances, 2022
Rotating machines, such as engines, turbines, or gearboxes, are widely used in modern society. Their mechanical components, such as rotors, bearings, or gears, are the main parts, and any failure in them can lead to a complete shutdown of the rotating ...
Jun Li, Yongbao Liu, Qiang Wang, Zhikai Xing, Fan Zeng   +4 more
doaj   +1 more source