Speed control of ultrasonic motors by adaptive control with a simplified mathematical model

1998 ◽  
Vol 145 (3) ◽  
pp. 180 ◽  
Author(s):  
T. Senjyu ◽  
S. Yokoda ◽  
H. Miyazato ◽  
K. Uezato
Keyword(s):  
Mathematical Model ◽  
Adaptive Control ◽  
Speed Control ◽  
Ultrasonic Motors ◽  
Simplified Mathematical Model

Mathematical Model of Ultrasonic Motors for Speed Control

2008 ◽  
Vol 36 (6) ◽  
pp. 637-648 ◽  
Author(s):  
Tomonobu Senjyu ◽  
Mitsuru Nakamura ◽  
Naomitsu Urasaki ◽  
Hideomi Sekine ◽  
Toshihisa Funabashi
Keyword(s):  
Mathematical Model ◽  
Speed Control ◽  
Ultrasonic Motors

Adjustable speed control of ultrasonic motors by adaptive control

1995 ◽  
Vol 10 (5) ◽  
pp. 532-538 ◽  
Author(s):  
T. Senjyu ◽  
K. Uezato ◽  
H. Miyazato
Keyword(s):  
Adaptive Control ◽  
Speed Control ◽  
Ultrasonic Motors ◽  
Adjustable Speed

Speed Control of Hydraulic Press via Adaptive Back-Stepping

2010 ◽  
Vol 40-41 ◽  
pp. 46-51
Author(s):  
Chang Bin Li ◽  
Ai Guo Wu ◽  
Chun Yan Du
Keyword(s):  
Mathematical Model ◽  
Adaptive Control ◽  
Speed Control ◽  
Adaptive Controller ◽  
Hydraulic Press ◽  
Speed Controller ◽  
Control Scheme ◽  
Simulation Results ◽  
The Mathematical Model ◽  
Adaptive Control Scheme

This paper is concerned with speed control of hydraulic press system. First, the mathematical model of hydraulic press is derived from its physical characteristics. Then, based on this model, the so-called back-stepping approach is used to design a speed controller. Moreover, in order to overcome the unknown deformation resistance and some other resistance, an adaptive control scheme is introduced to this controller. Finally, a real hydraulic press model is used to validate the proposed method. Simulation results show that the adaptive controller deals with the nonlinearity effectively, and the tracking performance of the system is good.

Research on Flux Damping Control Strategy of DFIG during Grid Voltage Dips

2015 ◽  
Vol 713-715 ◽  
pp. 756-759
Author(s):  
Xu Guang Zhang ◽  
Zhen Xie
Keyword(s):  
Mathematical Model ◽  
Control Strategy ◽  
Grid Voltage ◽  
Damping Control ◽  
Simulink Simulation ◽  
Voltage Dips ◽  
Simulation Results ◽  
Stator Flux ◽  
Natural Component ◽  
Simplified Mathematical Model

A flux damping control strategy was proposed to accelerate the decay of stator flux and restrain stator, rotor current and torque oscillation caused by grid voltage dips. Firstly, this paper analyzes the simplified mathematical model of DFIG during symmetrical voltage dips. Then, the mechanism of flux damping control strategy to restrain stator, rotor current oscillation and increase flux damping was analyzed. The flux damping control strategy can increase the damping of stator side, which accelerates the decay of the stator flux natural component and improve the dynamic LVRT performance of DFIG. The correctness and effectiveness of this method is verified by MATLAB/Simulink simulation results.

scholarly journals Mathematical model to estimate of the deterioration of wooden poles in contact with soil used in rural areas

2011 ◽  
Vol 31 (5) ◽  
pp. 1015-1026
Author(s):  
Julio C. Molina ◽  
Carlito Calil Júnior ◽  
Roberto R. de Freitas
Keyword(s):  
Mathematical Model ◽  
Rural Areas ◽  
Sao Paulo ◽  
São Paulo ◽  
Climatological Data ◽  
Paulo State ◽  
São Paulo State ◽  
Useful Life ◽  
Wooden Structures ◽  
Simplified Mathematical Model

In São Paulo State, mainly in rural areas, the utilization of wooden poles is observed for different purposes. In this context, wood in contact with the ground presents faster deterioration, which is generally associated to environmental factors and, especially to the presence of fungi and insects. With the use of mathematical models, the useful life of wooden structures can be predicted by obtaining "climatic indexes" to indicate, comparatively among the areas studied, which have more or less tendency to fungi and insects attacks. In this work, by using climatological data of several cities at São Paulo State, a simplified mathematical model was obtained to measure the aggressiveness of the wood in contact with the soil.

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