Plant resistance to xylem cavitation is a major drought adaptation trait and is essential to characterizing vulnerability to climate change. Cavitation resistance can be determined with vulnerability curves. In the past decade, new techniques have increased the ease and speed at which vulnerability curves are produced. However, these new techniques are also subject to new artefacts, especially ...

1. Introduction During recent years the speed-gradient algorithms developed in control engineering area [1,2] have been applied intensively to control of oscillatory motion and particularly to control of vibration units. Among problems solved by speed-gradient approach are control of vibration units in start-up modes (swing-up and passage through resonance) [ 3-5], synchronization [6-8], etc. O...

A signal processing technique is presented by which the position of a rotor supported in magnetic bearings may be deduced from the bearing current waveform. The bearing currents are presumed to be developed with a two state switching amplifier which produces a substantial high frequency switching ripple. This ripple is demodulated using a model reference parameter estimation technique which ext...

This note deals with the speed estimation of Unmanned Aerial Vehicle (UAV) using linear acceleration measurements. The estimator is a useful time-varying reduced-order Luemberger like observer such that the observation error is reduced to a time varying linear differential equation. Asymptotic stability of the estimation error is proved using the Lyapunov approach and the Barbalat lemma. Moreov...

The paper by Ţiclea and Besançon is an interesting contribution to the area of state and parameter estimation for both speed sensorless operation and insensitivity to parameter variation of an induction motor drive. It treats the problem of simultaneous state and parameter estimation in induction motor. It is to be noted that simultaneous estimation of speed and rotor resistance was, for a long...

An Xcell-60 5 ft rotor diameter hobby helicopter was instrumented to perform autonomous aggressive maneuvers. Avionics system, state estimator design, and vibration isolation are presented in detail. Analysis of helicopter dynamics based on flight data is given. 1 Ph. D. candidate, Department of Aeronautics and Astronautics, [email protected] 2 M.S. candidate, Department of Electrical Engineering...

This paper proposes a new scheme of induction motor parameter estimation using Genetic algorithm (GA) for condition monitoring. The flux linkage model and torque model of an induction motor is adapted to the estimation. The scheme is developed to obtain all the motor parameters: stator and rotor resistance, stator and rotor leaking reactance and magnetizing reactance, which paves the way to dia...

sensorless speed torque control of induction machines has been widely used in many industrial applications. the simple method of direct vector control can provide tacholess control as well as more complex approaches. in this method, the motor flux can be obtained by measuring voltage and current and integrating motor back electromotive force. the only required motor parameter is stator resistan...