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Thermal Bending of the Rotor Due to Rotor-to-Stator Rub [PDF]

open access: yesInternational Journal of Rotating Machinery, 2000
The rotor thermal bending due to the rotor-to-stator rubbing can lead to one of three types of observed rotor lateral motion: (1) spiral with increasing amplitude, (2) oscillating between rub]no-rub conditions, and (3) asymptotical approach to the rotor ...
Paul Goldman   +2 more
doaj   +2 more sources

Water as a Lévy Rotor [PDF]

open access: yesPhysical Review Letters, 2021
A probability density function describing the angular evolution of a fixed-length atom-atom vector as a L vy rotor is derived containing just two dynamical parameters: the L vy parameter $ $ and a rotational time constant $ $. A L vy parameter $ \!
Faux, David A.   +2 more
openaire   +3 more sources

Dynamic Performance Analysis of Cage in Four-Point Contact Ball Bearing

open access: yesLubricants, 2022
Due to the special structure of double-half inner rings, four-point contact ball bearings are prone to uneven forces in the inner raceway during movement, which affects the dynamic performance of the rolling element and cage, and even leads to cage ...
Yeteng Li   +5 more
doaj   +1 more source

Splitting of Waves in Rotor-in-Rotor Nonlocal Metamaterials by Internal Rotor Coupling

open access: yesSSRN Electronic Journal, 2022
Mechanical metamaterials can be used to control wave propagation because they are flexibly adjustable. In this paper, a one-dimensional rotor-in-rotor metamaterial with internal rotor coupling is proposed. This metamaterial introduces a new connection between lattices into a rotor-in-rotor system to produce a nonlocal metamaterial.
Leiyu Yang   +3 more
openaire   +2 more sources

A Generalized Bearing Dynamic with Adaptive Variation of Equation Numbers and Sliding Behavior Investigation

open access: yesLubricants, 2023
The complex sliding behavior inside ball bearings seriously affects the mechanical system’s performance. Current dynamic models for predicting this behavior suffer from poor generality and convergence.
Shuaijun Ma   +5 more
doaj   +1 more source

Optimized Mask-RCNN model for particle chain segmentation based on improved online ferrograph sensor

open access: yesFriction, 2023
Ferrograph-based wear debris analysis (WDA) provides significant information for wear fault analysis of mechanical equipment. After decades of offline application, this conventional technology is being driven by the online ferrograph sensor for real-time
Shuo Wang   +4 more
doaj   +1 more source

Research on the Bearing Sliding Loss Based on Time-Varying Contact Angle between Ball and Raceway

open access: yesLubricants, 2022
Based on the mechanical model, the friction loss between the ball and the raceway along the major axis of the contact ellipse is analyzed. The result shows that this part of the loss accounts for about 13.67% of the overall loss, which is mainly ...
Shuaijun Ma   +4 more
doaj   +1 more source

Differential Flatness of Quadrotor Dynamics Subject to Rotor Drag for Accurate Tracking of High-Speed Trajectories [PDF]

open access: yesIEEE Robotics and Automation Letters, 2017
In this letter, we prove that the dynamical model of a quadrotor subject to linear rotor drag effects is differentially flat in its position and heading. We use this property to compute feedforward control terms directly from a reference trajectory to be
Matthias Faessler   +2 more
semanticscholar   +1 more source

Signature of rotors [PDF]

open access: yesFundamenta Mathematicae, 2004
Rotors were introduced in Graph Theory by W.Tutte. The concept was adapted to Knot Theory as a generalization of mutation by Anstee, Przytycki and Rolfsen in 1987. In this paper we show that Tristram-Levine signature is preserved by orientation-preserving rotations.
Akira Yasuhara   +3 more
openaire   +3 more sources

Deep learning-enabled real-time personal handwriting electronic skin with dynamic thermoregulating ability

open access: yesnpj Flexible Electronics, 2022
The rapid rise of the Internet of things (IoT) have brought the progress of electronic skin (e-skin). E-skin is used to imitate or even surpass the functions of human skin. Thermoregulating is one of the crucial functions of human skin, it is significant
Shengxin Xiang   +5 more
doaj   +1 more source

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