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Rotational speed

About: Rotational speed is a research topic. Over the lifetime, 23327 publications have been published within this topic receiving 151696 citations. The topic is also known as: speed of revolution & revolution rate.


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Patent
24 Feb 2004
TL;DR: In this paper, a hybrid compressor for a vehicle where a vehicle engine is stopped when the vehicle is temporally stopped, a pulley, a motor and a compressor can be driven in independent from each other, and are connected to a sun gear, planetary carriers and a ring gear of a planetary gear.
Abstract: In a hybrid compressor for a vehicle where a vehicle engine is stopped when the vehicle is temporally stopped, a pulley, a motor and a compressor can be driven in independent from each other, and are connected to a sun gear, planetary carriers and a ring gear of a planetary gear. A rotational speed of the motor is adjusted by a controller, so that a rotational speed of the compressor is changed with respect to a rotational speed of the pulley. Accordingly, production cost of the hybrid compressor and the size thereof can be reduced, while a cooling function can be ensured even when the vehicle engine is stopped.

41 citations

Patent
13 Oct 2010
TL;DR: In this article, the authors present a centrifugal separator for separating solid particles from a liquid mixture, consisting of a rotor body (1) which is rotatable around an axis of rotation (R), a screw conveyor (2) adapted to rotate in the rotor body at a speed differing from the rotational speed of the rotor, and a control unit (44) that is adapted to control the drive arrangement (3, 3a, 3b, 3c, 3d, 3e, 3f, 3g) during a separation phase and at a second
Abstract: The present invention relates to a centrifugal separator for separating solid particles from a liquid mixture, said centrifugal separator comprising a rotor body (1) which is rotatable around an axis of rotation(R), the rotor body (1) having a separation chamber(16)with an inlet (13, 15) for the liquid mixture, at least one liquid outlet (25, 26, 31, 32) for a separated liquid from the liquid mixture, a sludge outlet(34)for the separated solid particles,a screw conveyor (2) adapted to rotate in the rotor body (1) around the axis of rotation (R), at a speed differing from the rotational speed of the rotor body (1), for transporting the separated solid particles in the separation chamber(16)towards and out of the sludge outlet(34), a drive arrangement (3, 3a, 3b, 3c) adapted to rotate the rotor body (1) and the screw conveyor (2) at their respective speeds, and a control unit (44) which is adapted to control the drive arrangement (3, 3a, 3b, 3c) to rotate the rotor body (1)at a first speed during a separation phase and at a second speed, which is lower than the first speed, during a particle discharge phase.

41 citations

Journal ArticleDOI
TL;DR: In this paper, the authors studied the vibration and reliability of a rotating beam with random properties under random excitations, where the rotating beam is under a stochastic load modeled as a stationary white noise and the cross-sectional area, elasticity modulus, moment of inertia, damping coefficient, mass density and rotational speed are modeled as random variables.

41 citations

Journal ArticleDOI
TL;DR: In this article, the effect of rotational speed, the volume percentage of the balls and powders on impact energy, the frequency of the impacts, the abrasion of balls and the dissipated energy have been investigated.

41 citations

Journal ArticleDOI
TL;DR: A novel compound fault detection method with virtual multichannel signals in the angle domain with computed order tracking to eliminate speed fluctuations is proposed to solve problems for rolling bearing monitoring under varying speed conditions.
Abstract: Mechanical fault diagnosis under varying speed conditions has gradually become an important issue in rotating machinery monitoring, especially the research on compound fault diagnosis is still rare. Order analysis is one of the most effective and widely used methods to eliminate the effects of speed fluctuations; however, it is difficult to extract compound fault features directly. Moreover, there are often many restrictions on the number and locations of sensors to be installed in practice, which also brings great challenges to compound fault diagnosis under varying speed conditions. In this article, a novel compound fault detection method with virtual multichannel signals in the angle domain is proposed to solve these problems for rolling bearing monitoring under varying speed conditions. First, we aim to use only a vibration acceleration sensor and a noncontact rotational speed sensor to adapt to limitations on sensor installation in practical applications. However, this may result in an underdetermined problem when trying to detect a compound fault with only a single-channel vibration signal. Then we make it up through constructing virtual multichannel signals based on variational mode decomposition theory, before which the nonstationary vibration signal is converted from the time domain into a stationary signal in the angle domain with computed order tracking to eliminate speed fluctuations. Finally, these virtual signals can be easily taken as input to a normal independent component analysis, and different faults can be detected in the order spectrum of each independent component. Case studies on rolling bearing experiments verified the advantages of the proposed method in compound fault detection under varying speed conditions.

41 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023539
20221,195
2021522
2020773
20191,092
20181,138