Experimental Study on Nonlinear Random Excitation

Pellicano, Francesco; Zippo, Antonio; Iarriccio, Giovanni; Barbieri, Marco

doi:10.1007/978-3-030-31154-4_54

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Nonlinear random vibrations of circular cylindrical shells were experimentally investigated in Ref. [33]. Modal localizations due to small imperfections in circular cylindrical shells were numerically investigated in Ref.…”

Section: Introductionmentioning

confidence: 99%

Free Vibration Analysis of Porous Functionally Graded Material Plates with Variable Thickness on an Elastic Foundation Using the R-Functions Method

Kurpa,

Pellicano,

Shmatko

et al. 2024

MCA

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Free vibrations of porous functionally graded material (FGM) plates with complex shapes are analyzed by using the R-functions method. The thickness of the plate is variable in the direction of one of the axes. Two types of porosity distributions through the thickness are considered: uniform (even) and non-uniform (uneven). The elastic foundation is defined by two parameters (Winkler and Pasternak). To obtain the mathematical model of the problem, the first-order shear deformation theory of the plate (FSDT) is used. The effective material properties in the thickness direction are modeled by means of a power law. Variational Ritz’s method joined with the R-functions theory is used for obtaining a semi-analytical solution of the problem. The approach is applied to a number of case studies and validated by means of comparative analyses carried out on rectangular plates with a traditional finite element approach. The proof of the efficiency of the approach and its capability to handle actual engineering problems is fulfilled for FGM plates having complex shapes and various boundary conditions. The effect of different parameters, such as porosity distribution, volume fraction index, elastic foundation, FGM types, and boundary conditions, on the vibrations is studied.

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Section: Introductionmentioning

confidence: 99%

Free Vibration Analysis of Porous Functionally Graded Material Plates with Variable Thickness on an Elastic Foundation Using the R-Functions Method

Kurpa,

Pellicano,

Shmatko

et al. 2024

MCA

View full text Add to dashboard Cite

show abstract

“…[5][6][7][8][9]. More recent studies on dynamic instabilities of cylindrical shells considered more refined theories such as the Sanders-Koiter theory [13][14][15][16][17][18] validated from lab experiments; in such series of studies it was clarified the role of axial loads generated by inertial effects on the onset of chaotic vibrations, very high amplitudes of vibration with associated extreme noise production.…”

Section: Introductionmentioning

confidence: 99%

Complex dynamics in non-Newtonian fluid-structure interaction

Pellicano

2023

Theoretical and Applied Mechanics - AIMETA 2022

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Abstract. This paper presents the results of an extensive experimental campaign focused on the analysis of the dynamic interactions between an elastic structure and a non-Newtonian fluid. The structure is a circular cylindrical shell clamped in one end to a shaking table and in the other end to a heavy rigid disk. The shell has been investigated both in presence and absence of fluid. The fluid is a mixture of water and corn starch flour, commonly called Oobleck. The experiments were carried out at low and high vibrating energy, in order to clarify the influence of the fluid in different conditions: changing of modal properties, onset of complex dynamics when the fluid-solid transitions take place in the fluid.

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“…In the last years, more and more Active Vibration Control has been increasing a lot of consideration, problem related to uncontrolled vibrations finds its application in wide range of industries, as for example: body plates of automobiles, preventing the bending of aerodynamic components in motorsports or reducing unwanted noise and resonance response; also in the aerospace sector, active vibration control finds its application as in [1] where Ye-Lin Lee describe a reduction of vibration up to 98% in simulations of a lift-offset compound helicopter using two active control techniques. Moreover, studies regarding experimental activities and problems of complex systems, as in [2], [3] and [4] demonstrate the importance of experimental investigations.…”

Section: Introductionmentioning

confidence: 99%

Microcontroller design for active vibration control

Zippo

2023

Theoretical and Applied Mechanics - AIMETA 2022

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Abstract. Active Vibration Control (AVC) problem is successfully studied considering all the characteristics of a control problem. The controlled system consists of a honeycomb panel of carbon fiber. Expensive devices are in general used for setting up and designing AVC this due to limitations for practical implementation. In our work we point to a low cost and practical solution using a microcontroller that has been verified. The honeycomb plate has been forces with out of plane load using an electrodynamic shaker at resonances that has been identified by experimental modal analysis. Piezoceramic patches are used as sensor and actuator for the control. Multiple analog signal processing circuits were developed to scale and shift the signal at the input and output of the MCU. The Positive Position Feedback (PPF) control algorithm is proposed, and a campaign of tests are carried out with harmonic excitations at resonance frequencies. Experimental results show an amplitude velocity reduction from 50% to 77% less and Power Spectral Density (PSD) attenuation up to 12.8 dB. The size and structural properties of the MFC patches, the control unit and structure under control are suitable for automobile and aerospace applications.

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Experimental Study on Nonlinear Random Excitation

Cited by 5 publications

References 13 publications

Free Vibration Analysis of Porous Functionally Graded Material Plates with Variable Thickness on an Elastic Foundation Using the R-Functions Method

Free Vibration Analysis of Porous Functionally Graded Material Plates with Variable Thickness on an Elastic Foundation Using the R-Functions Method

Complex dynamics in non-Newtonian fluid-structure interaction

Microcontroller design for active vibration control

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