Results 191 to 200 of about 987 (234)

Mixing Enhancement by a Micro-Rotor in Step Microchannel

ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels, 2008
This paper describes numerically the design and performance of an active mixer which aims to exploit the chaos generated by a micro-rotor in continuous flow. The mixer consists of a step contraction-expansion microchannel and a micro-rotor placed at the step. The micro-rotor can be set into motion by laser power or magnetic field, inducing 3D motion in
Thien Xuan Dinh, Yoshifumi Ogami
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Torsional frequencies of multi-stepped shafts with rotors

International Journal of Mechanical Sciences, 1978
Abstract An exact frequency determinant for natural frequencies of a multi-stepped shaft-rotor system, which includes the effect of shaft inertia, is developed. Frequency equations and modes of a heavy homogeneous engine, and those with one or two additional rotors, are derived using this result.
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A back-stepping control strategy for the Tri-rotor UAV

2012 24th Chinese Control and Decision Conference (CCDC), 2012
Over the last decade, the use of Unmanned Aerial Vehicles (UAVs) has increased dramatically in both military surveillance and in civilian search and rescue operations.
Anil Kulhare, Arindam Bhanja Chowdhury, Gaurav Raina   +2 more
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Elevation stepping of gimballed devices on rotor-stabilized spacecraft

Journal of Spacecraft and Rockets, 1975
Marko, W. J., "Transonic Dynamic and Static Stability Characteristics of Three Blunt-Cone Planetary Entry Shapes," JPL TR321357, Sept. 1969, Jet Propulsion Lab., Pasadena, Calif. Sammonds, R. I., "Dynamics of High-Drag Probe Shapes at Transonic Speeds," TN D-6489, Sept. 1971, NASA. Krumins, M.
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Wave Rotor Design Method With Three Steps Including Experimental Validation

Journal of Engineering for Gas Turbines and Power, 2018
This paper adapted and extended the preliminary two-step wave rotor design method with another step of experimental validation so that it became a self-validating wave rotor design method with three steps. First, the analytic design based on unsteady pressure wave models was elucidated and adapted to a design function. It was quick and convenient for a
Shining Chan, Huoxing Liu, Fei Xing, Hang Song   +3 more
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DYNAMIC ANALYSIS OF MULTI-STEPPED, DISTRIBUTED PARAMETER ROTOR-BEARING SYSTEMS

Journal of Sound and Vibration, 1999
Exact solutions for a distributed parameter system are of great use for the physical understanding of the system or the sensitivity analysis and design of the system. However, exact or closed-form solutions for multi-stepped rotor-bearing systems with distributed parameters have been rarely investigated.
S.-W. HONG, J.-H. PARK
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Effect of step skewed rotor type IPMSM on noise and vibration

Digests of the 2010 14th Biennial IEEE Conference on Electromagnetic Field Computation, 2010
Radial force and tangential force, which deform stator core, are the main causes of vibration and noise. There are many methods to minimize such exciting forces by designing of rotor shape. However, modification of rotor shape increase development cost of the motor. Therefore, step skewed rotor is applied to the design in order to reduce exciting force
null Jae-Woo Jung, null Do-Jin Kim, null Sang-Ho Lee, null Jung-Pyo Hong, null Dong-Hoon Lee   +4 more
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Time Step Sensitivity Analysis of a Flow-Driven Savonius Rotor

2019
The difficulty in choosing the right combination of time step and time increment in simulating a flow-driven rotating rotor is largely attributed to the wind speed dependent time constant which is defined as the elapsed time for the rotor to reach its stable rotational speed.
Ahmad Zakaria, Mohd Shahrul Nizam Ibrahim   +1 more
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Back-stepping control strategy for stabilization of a Tilt-rotor UAV

2012 24th Chinese Control and Decision Conference (CCDC), 2012
In today's world, the study and applications of Vertical Take-Off and Landing (VTOL) capable Unmanned Aerial Vehicles (UAVs) have increased vastly. A wide variety of UAVs are currently being employed in both civilian and military sectors. In this paper, our focus will be on the Tilt-rotor UAV.
Arindam Bhanja Chowdhury, Anil Kulhare, Gaurav Raina   +2 more
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Improvement of efficiency by stepped-skewing rotor for switched reluctance motors

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA), 2014
This paper presents efficiency improvement of switched reluctance motors (SRMs) by stepped-skewing rotor (SSR). The cross sectional configuration of the SRM tested including size and shape of salient poles is almost same as those of a conventional SRM. The tested SRM is divided into 3 stacks, and only rotor is skewed.
Makoto Sugiura, Yuji Ishihara, Hiroki Ishikawa, Haruo Naitoh   +3 more
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