Analytical solution for the vibration characteristics of a partially immersed plate with experimental investigation on wet mode shapes

Chen, Guan‐Wei; Liao, Chan Yi; Lin, Yang-Zhung; Lee, Kuan-Te; Ma, Chien‐Ching

doi:10.1016/j.apm.2022.06.018

Cited by 10 publications

(2 citation statements)

References 54 publications

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“…Here the function of the piezoelectric pump is ignored, and relies on the finite element software ANSYS Workbench 2021b to simulate and analyze the prototype equipped with only dual piezoelectric actuators. It should be pointed out that when conducting modal calculations on objects in contact with liquid environments, the influence of fluid interaction on the structure should be taken into account [34,35]. Hence, a cube area is introduced to represent the water domain while establishing the geometric model of the prototype, and their grid division is shown in figure 3(a).…”

Section: Analysis Of Dry and Wet Modalsmentioning

confidence: 99%

Development of a pump-jet piezoelectric swimmer with acoustic radiation actuation

Zheng,

Liu,

Wang

et al. 2024

Smart Mater. Struct.

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The acoustofluidic actuation produced by piezoelectric transducer is capable of propelling micro underwater robots forward, yet the motion pattern is relatively simplistic. To solve this problem, a pump-jet swimmer with a combination of the underwater acoustic radiation effect is proposed in this work. The absorption and discharge of internal piezoelectric pump provide the linear forward power, and turning is achieved under the acoustic propulsive force of the external dual piezoelectric actuators. The working mode and optimal driving frequency of the piezoelectric actuators are determined through finite element simulation and mechanical vibration characteristic tests. And the key dimensional parameters of the piezoelectric pump are optimized in the light of the output flow measurements. Finally, a prototype with the size of Ф3.1 cm×12 cm is fabricated for underwater driving performance experiments, which demonstrated well functions in straight swimming, turning, and loading. The swimmer with 20 g of additional load achieves a maximum speed of 105 mm/s at the voltage of 180 Vp-p, it also completes the obstacle avoidance in water along a certain path. The rationality of this conceived actuation mechanism is preliminarily verified, which shows a potential for fixed-point transportation in the complex underwater situations.

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Section: Analysis Of Dry and Wet Modalsmentioning

confidence: 99%

Development of a pump-jet piezoelectric swimmer with acoustic radiation actuation

Zheng,

Liu,

Wang

et al. 2024

Smart Mater. Struct.

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“…The ESPI used to detect the steady-state vibration of an object is called time-averaged ESPI(TA-ESPI), which has been widely investigated and applied to study composites, instruments, fluid-structure coupling plates, etc [11,[21][22][23][24][25][26][27][28][29]. The exciting frequency which can induce the local maximum response amplitude of the object is corresponding to the natural frequency.…”

Section: Introductionmentioning

confidence: 99%

Accurate determination of the elastic moduli of optimized cantilever beams by efficient time-averaged ESPI system

Ma¹,

Quan²,

Yang³

et al. 2022

Meas. Sci. Technol.

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Elastic moduli, including Young's modulus, shear modulus, bulk modulus, etc., are key parameters that are used to characterize the ability of a solid material to resist various types of deformation. The moduli can be extracted from the natural frequencies of a cantilever beam. In this paper, the relationships between moduli and natural frequencies, for the first time, are quantified by the finite element method(FEM). The optimized three-dimensional proportion of the cantilever beam is selected to be implemented simple error compensation. Experimentally, to precisely obtain the natural frequencies of the cantilever beam, an efficient time-averaged electronic speckle pattern interferometry(ESPI) system has been developed. The efficiency and precision are reflected in the following aspects: firstly, according to the slender character of the cantilever beam, a large shear optical path arrangement is designed to facilitate isolation from environmental interference; secondly, a resonance search method, based on the moiré effect is employed to recognize the natural frequencies accurately and efficiently; thirdly, a novel dynamic phase-shifting method is proposed based on the arrangement of the large shear optical path for clearer visualization of the mode shape of the cantilever beam. The proposed methods are verified by three kinds of common materials. The results suggest that Young's modulus and shear modulus derived from natural frequencies are higher than the known value, and the error compensation can significantly reduce the calculation error. Furthermore, the experiments carried out on the woven carbon fiber reinforced plastic(CFRP) laminates illustrate the potential of the proposed methods in the evaluation of elastic moduli of composites. Given that the exciter attached to the specimen surfaces can be replaced with some special counterparts, the proposed ESPI system has considerable potential to test the objects loaded in some extreme environments, e.g., high temperatures or underwater, where contact detection methods are difficult to be implemented.

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Investigation of Partially Submerged Rectangular Plate Modeshapes Through Eigenvectors in a Fluid Domain

Verma,

Kumar

2024

J. Vib. Eng. Technol.

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Analytical solution for the vibration characteristics of a partially immersed plate with experimental investigation on wet mode shapes

Cited by 10 publications

References 54 publications

Development of a pump-jet piezoelectric swimmer with acoustic radiation actuation

Development of a pump-jet piezoelectric swimmer with acoustic radiation actuation

Accurate determination of the elastic moduli of optimized cantilever beams by efficient time-averaged ESPI system

Investigation of Partially Submerged Rectangular Plate Modeshapes Through Eigenvectors in a Fluid Domain

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