Stability, bifurcation, and vibration control of a discontinuous nonlinear rotor model under rub-impact effect

Nonlinear Dynamics, Journal Year: 2023, Volume and Issue: 111(22), P. 20661 - 20697

Published: Oct. 13, 2023

Language: Английский

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Relationship of flow pattern, vibration, and noise in automobile refrigerant system and flow pattern identification based on convolutional neural network

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(9)

Published: Sept. 1, 2024

In recent years, the flow-induced vibration and noise in automotive refrigerant system gradually become main factor affecting driving comfort. However, relationship of flow pattern, vibration, is not clear, pattern identification easy but necessary. this paper, a series experiments are conducted to investigate flow-induce near thermal expansion valve an automobile system. The closely related startup processes. Mist flow, which contains more mist two-phase mixture than transition wispy-annular leads largest amplitude strong broadband hiss noise. Moreover, increase compressor speed promotes time domain has no effect on distribution peaks frequency spectrum. Finally, short-time Fourier transform convolutional neural network combined method for developed based After using transfer learning data augmentation, four trained architectures show relatively high accuracy above 94% test set. Among them, ResNet34 only highest 98.8% also can recognize each type pattern. generalization help engineers patterns air conditioning without visualization need measure sound signals.

Language: Английский

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Experimental investigation on the synchronization characteristics of a pitch-plunge aeroelastic system exhibiting stall flutter

Chaos An Interdisciplinary Journal of Nonlinear Science, Journal Year: 2022, Volume and Issue: 32(7)

Published: July 1, 2022

This study focuses on characterizing the bifurcation scenario and underlying synchrony behavior in a nonlinear aeroelastic system under deterministic as well stochastic inflow conditions. Wind tunnel experiments are carried out for canonical pitch-plunge subjected to dynamic stall The is observed undergo subcritical Hopf bifurcation, giving way large-amplitude limit cycle oscillations (LCOs) flutter regime flow At this condition, we observe intermittent phase synchronization between pitch plunge modes near fold point, whereas via trapping point. Repeating conditions, two different responses: low amplitude noise-induced random (NIROs) high-amplitude LCOs (RLCOs) during flutter. present shows asynchrony NIRO regime. onset of RLCOs, persists even though relative distribution changes. With further increase velocity, To best authors' knowledge, first reporting experimental evidence an system, which great interest dynamics community. Furthermore, given ubiquitous presence stochasticity variety engineering systems, such wind turbine blades, helicopter unmanned aerial vehicles, findings will be directly beneficial efficient design futuristic systems.

Language: Английский

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Dynamical responses for a vertical vibration model of a four-roller cold rolling mill under combined stochastic and harmonic excitations

Probabilistic Engineering Mechanics, Journal Year: 2023, Volume and Issue: 73, P. 103480 - 103480

Published: June 15, 2023

Language: Английский

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Probabilistic description of extreme oscillations and reliability analysis in rolling motion under stochastic excitation

Science China Technological Sciences, Journal Year: 2023, Volume and Issue: 66(9), P. 2586 - 2596

Published: Aug. 21, 2023

Language: Английский

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