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Your search keyword '"Jaber, Nizar"' showing total 7 results
Start Over Author "Jaber, Nizar" Topic internal resonance
7 results on '"Jaber, Nizar"'

5. Subcombination internal resonance of the additive type in the response dynamics of micromachined resonators crossing the impacting threshold.

Author

Ruzziconi, Laura, Jaber, Nizar, Hajjaj, Amal Z., and Younis, Mohammad I.

Subjects
*FAST Fourier transforms, *SILICON nitride, *RESONANCE, *RESONATORS, *OSCILLATIONS
Abstract

In the present paper, a microbeam-based MEMS device is experimentally driven to experience a subcombination internal resonance (IR) of the additive type, where the second mode internally resonates with both the first and the third modes inducing a range of quasi-periodic dynamics. The main features of the experimental quasi-periodicity are analyzed, which inherently depend on the ratios established by the frequencies of the involved modes. Experimental Poincaré maps are established and tracked, exhibiting a specific underlying pattern. Numerical simulations are developed and the Fast Fourier Transform frequency trend lines are examined, showing the variations of the modes frequencies values while keeping the subcombination IR relationship. We investigate the evolution of the quasi-periodic waveform as increasing the excitation frequency. Special attention is devoted to the hardening dominance of the system, which influences the modes frequencies components. The last part of the paper is focused on the impacting regime. Since the microbeam is constituted by a dielectric layer (Silicon Nitride), impacts take place as raising the oscillation amplitudes. We analyze the experimental behavior at impacts, showing the possibility of dynamics with different characteristics, including both quasi-periodic, chaotic and periodic regions, all of them holding subcombination IR signature. • MEMS device is experimentally driven to exhibit subcombination internal resonance. • Experimental quasi-periodic pattern inherently depends on the frequencies involved. • Quasi-periodic dynamics alternate with periodic and chaotic bands. • As driven to impacts, signature of subcombination internal resonance is retained. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Experimental and theoretical investigation of the 2:1 internal resonance in the higher-order modes of a MEMS microbeam at elevated excitations.

Author

Ruzziconi, Laura, Jaber, Nizar, Kosuru, Lakshmoji, Bellaredj, Mohammed L., and Younis, Mohammad I.

Subjects
*RESONANCE, *VOLTAGE
Abstract

We analyze the dynamics induced by a 2:1 internal resonance between the third (second symmetric) and the fifth (third symmetric) mode of a MEMS microbeam. An extensive experimental investigation is conducted, where forward and backward sweeps are systematically acquired up to elevated excitations. As ramping the voltage, a change along the forward sweep of the resonant branch is noted. This is analyzed via the combined use of different analytical and numerical tools, which show a phase shift between the modes involved in the 2:1 internal resonance. Constantly referring to the experimental data, simulations examine the underlying features of the system's behavior. The dynamics observed in the experimental frequency sweeps are part of a more complex scenario, where different attractors appear and coexist. The experimental behavior bifurcation chart is reported and compared with simulations, which offers a comprehensive view of the 2:1 internal resonance activation. The concurrence of numerical results and experimental data confirms on the effective actuality of these complex features in safe conditions, along wide ranges of the parameters space. [ABSTRACT FROM AUTHOR]

Published
2021
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7. Two-to-one internal resonance in the higher-order modes of a MEMS beam: Experimental investigation and theoretical analysis via local stability theory.

Author

Ruzziconi, Laura, Jaber, Nizar, Kosuru, Lakshmoji, Bellaredj, Mohammed L., and Younis, Mohammad I.

Subjects
*STABILITY theory, *RESONANCE, *OSCILLATIONS
Abstract

The present study is focused on the dynamics of a microbeam-based MEMS device and analyzes its behavior in the neighborhood of the third natural frequency. An extensive experimental investigation is conducted. The main resonant and non-resonant branches span a wide range of coexistence. The 2:1 internal resonance is activated between the third and fifth modes, in which case the device exhibits complex and intriguing dynamics. The experimental data are examined in depth using various analytical and numerical tools. Alongside with the experiments, theoretical simulations are developed, where the main features of the internal resonance are properly represented and the contribution of each mode is discussed. The main steps of the progression of the 2:1 internal resonance are highlighted and the possibility of more complex internal resonances is explored, where different higher modes are involved. • The 2:1 internal resonance in a MEMS device is investigated experimentally and theoretically. • The internal resonance is activated between third and fifth modes, exhibiting intriguing dynamics. • The internal resonance affects the shape of oscillations and may shrink the operational range. • The relevance of the obtained results for the design stage is highlighted. [ABSTRACT FROM AUTHOR]

Published
2021
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