Dynamic modelling and active vibration control of a submerged rectangular plate equipped with piezoelectric sensors and actuators

Kwak, Moon Kyu; Yang, Dong-Ho

doi:10.1016/j.jfluidstructs.2015.02.001

Cited by 31 publications

(10 citation statements)

References 14 publications

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“…Therefore, PZTs have been successfully used in the last years [13,15,16,17,18,19,20]. Presas et al [13,15,16] successfully determined the natural frequencies and mode shapes of a rotating and confined stiff disk submerged and confined in water by means of PZT.…”

Section: Introductionmentioning

confidence: 99%

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Accurate Determination of the Frequency Response Function of Submerged and Confined Structures by Using PZT-Patches†

Presas

Valentín

Valero

et al. 2017

Sensors

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To accurately determine the dynamic response of a structure is of relevant interest in many engineering applications. Particularly, it is of paramount importance to determine the Frequency Response Function (FRF) for structures subjected to dynamic loads in order to avoid resonance and fatigue problems that can drastically reduce their useful life. One challenging case is the experimental determination of the FRF of submerged and confined structures, such as hydraulic turbines, which are greatly affected by dynamic problems as reported in many cases in the past. The utilization of classical and calibrated exciters such as instrumented hammers or shakers to determine the FRF in such structures can be very complex due to the confinement of the structure and because their use can disturb the boundary conditions affecting the experimental results. For such cases, Piezoelectric Patches (PZTs), which are very light, thin and small, could be a very good option. Nevertheless, the main drawback of these exciters is that the calibration as dynamic force transducers (relationship voltage/force) has not been successfully obtained in the past. Therefore, in this paper, a method to accurately determine the FRF of submerged and confined structures by using PZTs is developed and validated. The method consists of experimentally determining some characteristic parameters that define the FRF, with an uncalibrated PZT exciting the structure. These parameters, which have been experimentally determined, are then introduced in a validated numerical model of the tested structure. In this way, the FRF of the structure can be estimated with good accuracy. With respect to previous studies, where only the natural frequencies and mode shapes were considered, this paper discuss and experimentally proves the best excitation characteristic to obtain also the damping ratios and proposes a procedure to fully determine the FRF. The method proposed here has been validated for the structure vibrating in air comparing the FRF experimentally obtained with a calibrated exciter (impact Hammer) and the FRF obtained with the described method. Finally, the same methodology has been applied for the structure submerged and close to a rigid wall, where it is extremely important to not modify the boundary conditions for an accurate determination of the FRF. As experimentally shown in this paper, in such cases, the use of PZTs combined with the proposed methodology gives much more accurate estimations of the FRF than other calibrated exciters typically used for the same purpose. Therefore, the validated methodology proposed in this paper can be used to obtain the FRF of a generic submerged and confined structure, without a previous calibration of the PZT.

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Section: Introductionmentioning

confidence: 99%

“…In all of those cases, it was not possible to use classical exciters due to the inaccessibility of the respective structures. Recently Kwak [19,20] successfully used PZTs as actuators and sensors for an active vibration control of a partially submerged thin plate.…”

Section: Introductionmentioning

confidence: 99%

Accurate Determination of the Frequency Response Function of Submerged and Confined Structures by Using PZT-Patches†

Presas

Valentín

Valero

et al. 2017

Sensors

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show abstract

“…Some studies include not only a theoretical modelling of the design of the controller, but also experimental validation. Kwak et al [ 43 , 44 ], modelled the structure, the fluid effect, and the constitutive equations of PZTp, in a partially submerged plate equipped with PZT sensors and actuators to design the controller and validate the model with experimentation. In this case a MIMO (Multiple-Input Multiple-Output) digital controller is designed (two PZT actuators and two PZT sensors are used).…”

Section: Applications Of Pzt Patches In Submerged Systemsmentioning

confidence: 99%

“…In this case a MIMO (Multiple-Input Multiple-Output) digital controller is designed (two PZT actuators and two PZT sensors are used). An example of the damping effect of the active vibration control in the submerged plate is shown in Figure 4 [ 44 ]. In both cases, the plate is excited with an impact of similar force (external excitation) and the responses of the structure with and without active control are represented.…”

Section: Applications Of Pzt Patches In Submerged Systemsmentioning

confidence: 99%

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A Review of PZT Patches Applications in Submerged Systems

Presas

Luo

Wang

et al. 2018

Sensors

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Submerged systems are found in many engineering, biological, and medicinal applications. For such systems, due to the particular environmental conditions and working medium, the research on the mechanical and structural properties at every scale (from macroscopic to nanoscopic), and the control of the system dynamics and induced effects become very difficult tasks. For such purposes in submerged systems, piezoelectric patches (PZTp), which are light, small and economic, have been proved to be a very good solution. PZTp have been recently used as sensors/actuators for applications such as modal analysis, active sound and vibration control, energy harvesting and atomic force microscopes in submerged systems. As a consequence, in these applications, newly developed transducers based on PZTp have become the most used ones, which has improved the state of the art and methods used in these fields. This review paper carefully analyzes and summarizes these applications particularized to submerged structures and shows the most relevant results and findings, which have been obtained thanks to the use of PZTp.

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Investigation of damping characteristics onPLArobotic gripper fingers with magnetorheological fluid core and unimorph piezoelectricMFC

Ramkumar¹,

Jesu²,

Marimuthu³

2022

Polymer Engineering & Sci

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Polylactic acid (PLA) is an environmentally friendly, biodegradable, and lowcost thermoplastic material suitable for 3D printing. Complex shapes can be easily produced and hence PLA has been used for many applications. This study presents the damping characteristics of two robotic gripper fingers. The first gripper is composed of a PLA surface layer and a magnetorheological (MR) fluid core and the second gripper is composed of a PLA surface layer bonded to a surface of unimorph piezoelectric Macro Fiber Composite (MFC).The magnetic field is applied by using permanent magnets while the magnetic field strength is varied by changing the distance between the permanent magnets. The electric field is applied by using a micro-amplifier and regulated using data acquisition systems. The natural frequency and damping ratio of the PLA gripper finger are determined by free vibration analysis using LabVIEW software. The damping ratio and vibration amplitude suppression for the PLA grippers was increased as the magnetic field strength changed from 0G to 600G (MR) and as the electric field changed from 0V to 360V (MFC).

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Dynamic modelling and active vibration control of a submerged rectangular plate equipped with piezoelectric sensors and actuators

Cited by 31 publications

References 14 publications

Accurate Determination of the Frequency Response Function of Submerged and Confined Structures by Using PZT-Patches†

Accurate Determination of the Frequency Response Function of Submerged and Confined Structures by Using PZT-Patches†

A Review of PZT Patches Applications in Submerged Systems

Investigation of damping characteristics onPLArobotic gripper fingers with magnetorheological fluid core and unimorph piezoelectricMFC

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