Asymmetric vibrations and chaos in spherical caps under uniform time-varying pressure fields

Iarriccio, Giovanni; Zippo, Antonio; Pellicano, Francesco

doi:10.1007/s11071-021-07033-7

Cited by 3 publications

(2 citation statements)

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“…In Ref. [32], nonlinear dynamics of spherical caps were numerically investigated, with an exploration of chaos-induced symmetry breaking. Nonlinear random vibrations of circular cylindrical shells were experimentally 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

Self Cite

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“…In [10], Moon K.Kwak developed a MIMO PPF controller realized by a dSpace DSP board, with the sampling frequency of ADC and DAC being 50 kHz, A.Zippo et alt., in [11], showed experiments implementing a variety of configurations: SISO, multiSISO and MIMO on a freefree composite panel with PPF method and MFC patches both for sensors and actuators in linear and nonlinear range. Moreover, analytically define chaotic structures is stimulating for improving our knowledge in the occurrence of vibrations related to complex systems [12] with quasiperiodic and chaotic motion [13].…”

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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