scholarly journals Steady-State Fuzzy Modeling of Ultrasonic Motor System

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Shi Jingzhuo ◽  
Lv Lin
Keyword(s):  
Steady State ◽  
Motor System ◽  
Method Comparison ◽  
Calculated Data ◽  
Ultrasonic Motor ◽  
Driving Voltage ◽  
Control Effect ◽  
Rotating Speed ◽  
Steady State Model ◽  
Voltage Frequency

Because of the complicated energy conversion process, ultrasonic motor has remarkable nonlinearity. Therefore, it is difficult to achieve accurate speed control of ultrasonic motor. In general, a good model is the foundation of the accurate control effect. Because of the remarkable non-linearity of ultrasonic motor, the model should also be nonlinear. In this paper, the two-input and one-output steady-state model of ultrasonic motor system is worked out using fuzzy reasoning modeling method. Comparison between experimental data and calculated data of the model prove that the model can well simulate the nonlinear relationship among the amplitude of driving voltage, frequency, and rotating speed.

scholarly journals Dynamic Takagi-Sugeno Model for the Control of Ultrasonic Motor

2011 ◽  
Vol 2011 ◽  
pp. 1-9
Author(s):  
Shi Jingzhuo ◽  
Lv Lin ◽  
Zhang Yu
Keyword(s):  
Experimental Data ◽  
Fuzzy Model ◽  
Calculated Data ◽  
Fuzzy Reasoning ◽  
Ultrasonic Motor ◽  
Driving Voltage ◽  
Driving System ◽  
Position Controller ◽  
Sugeno Model ◽  
Takagi Sugeno

Model of ultrasonic motor is the foundation of the design of ultrasonic motor's speed and position controller. A two-input and one-output dynamic Takagi-Sugeno model of ultrasonic motor driving system is worked out using fuzzy reasoning modeling method in this paper. Many fuzzy reasoning modeling methods are sensitive to the initial values and easy to fall into local minimum, and have a large amount of calculation. In order to overcome these defects, equalized universe method is used in this paper to get clusters centers and obtain fuzzy clustering membership functions, and then, the unknown parameters of the conclusions of fuzzy rules are identified using least-square method. Different experimental data that are tested with different operational conditions are used to examine the validity of the fuzzy model. Comparison between experimental data and calculated data of the model indicates that the model can well describe the nonlinear characteristics among the frequency, amplitude of driving voltage and rotating speed. The proposed fuzzy model can be used to analyze the performance of ultrasonic motor driving system, and also can be used to design the speed and position controller of ultrasonic motor.

Nonlinear Iterative Learning Control of Travelling Wave Ultrasonic Motor

2014 ◽  
Vol 1049-1050 ◽  
pp. 973-976
Author(s):  
Yu Liu
Keyword(s):  
Control Strategy ◽  
Iterative Learning Control ◽  
Motor System ◽  
Control Algorithm ◽  
Learning Control ◽  
Travelling Wave ◽  
Ultrasonic Motor ◽  
Iterative Learning ◽  
Control Effect ◽  
Learning Capacity

The relatively simple control strategy can decrease the complexity of the ultrasonic motor system and increase the cost performance. The nonlinear iterative learning control algorithm is simple, the control parameters can be determined according to little experimental knowledge. According to the control characteristics of ultrasonic motor, the nonlinear iterative learning control algorithm is improved and the nonlinear iterative learning control strategy of motor’s speed is designed. Experiments show that the motor system has good iterative learning capacity, the control effect is improved generally in the repeated learning process and the control strategy is simple and effective.

scholarly journals A study on modeling of a piezoelectric motor

2021 ◽  
Vol 12 (2) ◽  
pp. 695
Author(s):  
Youssef Baba ◽  
Mostafa Bouzi
Keyword(s):  
Model Comparison ◽  
Control Strategies ◽  
Fuzzy Model ◽  
Calculated Data ◽  
Least Square Method ◽  
Least Square ◽  
Driving Voltage ◽  
Unknown Parameters ◽  
Rotating Speed ◽  
Takagi Sugeno

n this paper, a study on modeling of a piezoelectric transducer type rotary traveling wave ultrasonic motor (USM) is presented. First a mathematical model and numerical simulation results are achieved. The model is based on the theory of piezoelectricity and physic theory. An experimental model is worked out and compared to the numerical model. The influence of the temperature on characteristics such as the rotational speed of the motor is considered. The speed of the USM is measured at temperature between 17°Cand 50°C. To develop suitable control strategies for the drive, a fuzzy model type Takagi-Sugeno is used. The unknown parameters of the output membership functions are determined by least square method. Experimental data are used to examine the validity of the fuzzy model. Comparison between experimental and calculated data of the fuzzy model indicates that the fuzzy model can well describe the nonlinear characteristics among the frequency of driving voltage and rotating speed.

Variable Step-Length Efficiency Optimum Control of Traveling Wave Ultrasonic Motor System

2011 ◽  
Vol 383-390 ◽  
pp. 6484-6489
Author(s):  
Bo Liu ◽  
Jing Zhuo Shi ◽  
Xun Liu
Keyword(s):  
Motor System ◽  
Closed Loop ◽  
Step Length ◽  
Operational Efficiency ◽  
Ultrasonic Motor ◽  
Closed Loop Control ◽  
Driving Voltage ◽  
Control Performance ◽  
Optimum Control ◽  
Loop Control

To achieve the operational efficiency maximization of ultrasonic motor system, this paper analyzes optimum control of the ultrasonic motor system’s efficiency including driving circuit, while the speed closed-loop control performance is ensured. Based on regulating characteristics of open-loop speed control and fuzzy control, two optimum control methods for regulating the changing step-length of driving voltage amplitude, to shorten the elapsed time of efficiency optimization process and to improve the general operational efficiency of motor system and the speed closed-loop control performance, are also analyzed. The effectiveness of the methods mentioned in this paper are reflected using experiments.

Steady-state model for the three-leg shunt-series ac-link power flow controller

2015 ◽  
Vol 9 (16) ◽  
pp. 2534-2543 ◽  
Author(s):  
Manuel Barragán-Villarejo ◽  
Alejandro Marano-Marcolini ◽  
Jose Maria Maza-Ortega ◽  
Antonio Gómez-Expósito
Keyword(s):  
Steady State ◽  
Power Flow ◽  
State Model ◽  
Steady State Model ◽  
Flow Controller ◽  
Power Flow Controller ◽  
Shunt Series

scholarly journals Three-Phase Steady-State Model of Doubly Fed Induction Generator Considering Various Rotor Speeds

IEEE Access ◽  
2016 ◽  
Vol 4 ◽  
pp. 9479-9488 ◽  
Author(s):  
Yuntao Ju ◽  
Fuchao Ge ◽  
Wenchuan Wu ◽  
Yi Lin ◽  
Jing Wang
Keyword(s):  
Steady State ◽  
State Model ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Three Phase ◽  
Steady State Model ◽  
Doubly Fed

Steady-State and Dynamic Properties of the Floating-Ring Journal Bearing

1968 ◽  
Vol 90 (1) ◽  
pp. 243-253 ◽  
Author(s):  
F. K. Orcutt ◽  
C. W. Ng
Keyword(s):  
Steady State ◽  
Journal Bearing ◽  
Dynamic Properties ◽  
Calculated Data ◽  
Experimental Results ◽  
Supply Pressure ◽  
Pressure Parameter

Calculated data on steady-state and dynamic properties of the plain cylindrical floating-ring bearing with pressurized lubricant supply are given. The data are for a bearing with L/D of 1, and values of the ratio of inner to outer film clearances of 0.7 and 1.3. One value of dimensionless supply pressure parameter is covered. Experimental results are presented which verify the calculated results and which supplement them, particularly with respect to stability characteristics of the bearing.

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