Adaptive Charge Estimation of Piezoelectric Actuators with a Variable Sensing Resistor, an Artificial Intelligence Approach

Mohammadzaheri, Morteza and Ziaiefar, Hamidreza and Ghodsi, Mojtaba and Emadi, Mohammadreza and Zarog, Musaab and Soltani, Payam and Bahadur, Issam (2022) Adaptive Charge Estimation of Piezoelectric Actuators with a Variable Sensing Resistor, an Artificial Intelligence Approach. Engineering Letters, 30 (1). ISSN 1816-0948

revised_EL_210203_30_December_2021.pdf - Accepted Version

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Experiments have shown that, for an extensive area of operating, charge of a piezoelectric actuator is proportional to its displacement from relaxing state. Consequently, accurate estimation of charge can lead to position/displacement estimation for piezoelectric actuators, a prominent progress towards precise sensorless micro/nanopositioning. However, disadvantageously, all known charge estimators of piezoelectric actuators have electrical element(s), e.g. (a) resistor(s) or (a) capacitor(s), in series with the actuator. Such elements, known as sensing elements, take a considerable share of the excitation voltage. Voltage taken by the sensing elements is called voltage drop. Charge estimators with a resistor in series with the actuator (also known as digital charge estimators) have been reported to witness the smallest voltage drop. The aim of this paper is to design such charge estimators so as to achieve maximum precision at minimum possible voltage drop. The aforementioned aim is shown to be obtained when the range of the voltage across the resistor equals the narrowest input range of the analogue to digital convertor of the charge estimator. This, however, is impossible to happen for wide operating areas with a sensing resistor with unchangeable resistance, according to experimental results. The alternative is an adaptive charge estimator with a resistor, in which its resistance varies with operating conditions. This paper presents two methods to estimate such a varying sensing resistor: approximate analytical formulation and artificial intelligence, in which, the latter shows evident superiority.

Item Type: Article
6 January 2022Accepted
31 March 2022Published Online
Uncontrolled Keywords: Piezoelectric Actuator, Charge, Fully Connected, Cascade Network, Voltage Drop, Precision
Subjects: CAH00 - multidisciplinary > CAH00-00 - multidisciplinary > CAH00-00-00 - multidisciplinary
CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-02 - mechanical engineering
CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-08 - electrical and electronic engineering
CAH11 - computing > CAH11-01 - computing > CAH11-01-05 - artificial intelligence
Divisions: Faculty of Computing, Engineering and the Built Environment > School of Engineering and the Built Environment
Depositing User: Morteza Mohammadzaheri
Date Deposited: 11 Feb 2022 09:36
Last Modified: 01 Apr 2022 09:28

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