Results 191 to 200 of about 1,006 (231)

Dynamic Surface Back-Stepping Control of Multi-rotor Aircraft

2016 3rd International Conference on Information Science and Control Engineering (ICISCE), 2016
For the multi rotor aircraft with high model order, a control strategy based on dynamic surface back-stepping is putted forward to solve the problem that the derivation of the virtual control input signal is complicated when conventional back-stepping approach is used. First, the mathematical model of multi rotor aircraft is established.
Jianxin Liu, Yong Zhang, Zhichao He, Shengle Zhang, Jianbo Zhou   +4 more
openaire   +1 more source

Complex Variable Filtering: The Next Step in Rotor Diagnostics

Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award, 2001
Currently most rotor diagnostic algorithms focus on extracting as much information as possible from the signal of a single transducer. This limits these algorithms to only processing information about the projection of the rotor motion onto the probe axis.
Wes Franklin, Donald E. Bently
openaire   +1 more source

Step by step robust nonlinear PI for attitude stabilisation of a four-rotor mini-aircraft

2008 16th Mediterranean Conference on Control and Automation, 2008
Based on the Euler angles parameterization, a new approach for the attitude control of a vertical take-off and landing (VTOL) quadrotor aircraft is proposed. It rests on the combination of the backstepping technique and a nonlinear robust PI controller.
M. Bouchoucha, M. Tadjine, A. Tayebi, P. Mullhaupt   +3 more
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source