Results 81 to 90 of about 12,252 (219)

Test results and flight experience of ball bearing momentum and reaction wheels [PDF]

The required satellite mission durations and levels of reliability have been considerably increased: While in the beginning of the 70's 3 to 5 year missions were planned, the standard is now 10 years with an expansion to 15 years and more for such ...
Auer, W.
core   +1 more source

Nimbus Meteorological Satellite Integration and Testing Materials Report No. 8 [PDF]

Nimbus satellite component and materials environmental investigations, failure analyses, and quality control ...
Neville, T.
core   +1 more source

Influence of roughness on contact interface in fretting under dry and boundary lubricated sliding regimes [PDF]

, 2009
This paper presents experimental results of wear process under dry and boundary lubricated metallic (AISI 1034/AISI 52100) contacting bodies with different surfaces morphologies subjected to a wide range of kinematic fretting conditions.
Kubiak, Krzysztof, Mathia, T.G.
core   +1 more source

Lubricating and Conductive Properties of Modified Graphene/Silver Nanoparticles Under Current-Carrying Friction Conditions

Lubricants
With the rapid development of the electric vehicle industry, motor bearings have higher requirements for the friction reduction and electrical conductivity of grease.
Yuxin Chen, Kun Peng, Xiao Li, Luyi Sun, Taiyu Su, Wei Zhang, Dancong Zhang, Shiwei Fan, Hongbin Yin, Ming Zhou   +9 more
doaj   +1 more source

Lubricant effects on bearing life [PDF]

Lubricant considerations for rolling-element bearings have within the last two decades taken on added importance in the design and operation of mechanical systems.
Zaretsky, Erwin V.
core   +1 more source

Triboelectric Performance of Ionic Liquid, Synthetic, and Vegetable Oil-Based Polytetrafluoroethylene (PTFE) Greases

Lubricants
Within electrical contacts, poor electrical conductivity of lubricants can lead to triboelectric charging, causing electrostatic currents and thermal effects, which accelerate lubrication failure. This study aimed to address these challenges by producing
Nur Aisya Affrina Mohamed Ariffin, Chiew Tin Lee, Arunkumar Thirugnanasambandam, King Jye Wong, William Woei Fong Chong   +4 more
doaj   +1 more source

Synergy Effect of Vapor-Grown Carbon Nanofiber and Molybdenum Disulfide Additives on Urea-Based Grease Thermal and Lubrication Properties

Tribology Online, 2008
Measurements of both thermal and lubrication properties of urea-based grease composites were conducted with and without additives of vapor grown carbon nanofiber (VGCNF) and solid lubricant molybdenum disulfide (MoS2).
Fumihiro Kobayashi, Yuji Enomoto, Tsuneaki Yamabe, Morinobu Endo, Yukitoshi Fujinami   +4 more
doaj   +1 more source

Grease lubricated spiral groove gyro bearings Final report [PDF]

Grease lubricated spiral groove bearings suitable for spin axis of gyros in automatic ...
Chu, T. Y., Mc Cabe, J. T.
core   +1 more source

Developing a sustainable grease from jojoba oil with plant waste based nanoadditives for enhancement of rolling bearing performance

Scientific Reports
This paper presents a novel grease from jojoba oil and activated carbon nanoparticles (ACNPs) extracted from banana peel waste. The raw jojoba oil and ACNPs are first characterized for structural properties.
Ndabezinhle Ngubhe Dube, Marwa ElKady, Hussien Noby, Mohamed G. A. Nassef   +3 more
doaj   +1 more source

Analysis of Dynamic Characteristics of Grease-Lubricated Tapered Roller Bearings

Shock and Vibration, 2018
Tapered roller bearings (TRBs) are applied extensively in the field of high-speed trains, machine tools, automobiles, etc. The motion prediction of main components of TRBs under grease lubrication will be beneficial to the design of bearings and the ...
Zheng-Hai Wu, Ying-Qiang Xu, Si-Er Deng
doaj   +1 more source