Abstract
Vibration is usually caused by external disturbances, which may lead to structural damage. Vibrations can be significantly suppressed by taking disturbances into account. However, in many cases disturbances are unknown or difficult to be measured directly. In order to estimate external unknown disturbances, this article develops a proportional-integral (PI) disturbance observer with measurement noises for smart structures using multiple distributed piezoelectric sensors. For simulation purpose, a dynamic finite element model of piezoelectric bonded smart structure is presented. This disturbance observation method is validated by estimating various kinds of unknown disturbances using piezoelectric measurements. Furthermore, the measurement numbers and the position of measurements are investigated.
Highlights
In many cases, disturbances acting on structures cannot be measured directly due to complexity of the working environment [1,2]
To further improve the dynamic performance of disturbance observation system, the aim of this article is to extend the theory for estimation of unknown disturbances with measurement noises using multiple distributed piezoelectric sensors
To validate the finite element model of the clamped beam bonded with multiple piezoelectric patches, static and dynamic behavior is studied and compared with those calculated by Abaqus
Summary
Disturbances acting on structures cannot be measured directly due to complexity of the working environment [1,2]. Disturbance is the major influence in a vibration system. If an unknown disturbance can be reconstructed, it is possible and easy to compensate by a feedback controller using appropriate control strategies [3]. It is important to estimate external unknown disturbances for suppression of a vibration system. Disturbance estimation, known as loads identification, is used for solving problems of location and identification of excitation sources [4]. The frequency domain method based on a linear model was first proposed by Barlett and Flannelly [6], and later developed by Hillary and Ewins [7] and Karlsson [8]. The development of the theory of frequency domain method is relatively mature, certainly there are some restrictions
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