Delamination of surface accretions with structural waves: Piezo-actuation and power requirements

Kalkowski, Michał K.; Waters, T.P.; Rustighi, Emiliano

doi:10.1177/1045389x16672567

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…Shear stress between an accreted layer and its substrate is the response quantity of interest for vibration based accretion removal [13]. Whilst zero at the surface of the single layer beam model adopted in this paper, the shear stress on the neutral axis is nevertheless a useful proxy measure in feasibility and optimisation studies.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A chirp excitation for focussing flexural waves

Waters

2019

Journal of Sound and Vibration

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In this paper, the dispersive nature of flexural waves is exploited to generate a shock response at an arbitrary location on a waveguide. The input waveform is an up-chirp whose instantaneous frequency is chosen to ensure synchronous arrival at an arbitrary focal point. An analytical expression is derived for the required chirp waveform as a function of bandwidth and focal point location given prior knowledge of the dispersion relation. The principle is illustrated for an analytical model of a uniform beam. Simulated results show that it is possible, in theory, to achieve peak responses that are at least an order of magnitude larger than steady state response due to harmonic excitation. Further, the peak response increases with approximately the square root of distance from the point of excitation when damping is negligible. Velocity, acceleration, normal strain and shear stress exhibit qualitatively similar results which differ quantitatively owing to their different frequency responses with respect to the input. A single degree-of-freedom model of an electrodynamic shaker is coupled to the analytical beam model in order to predict peak mechanical responses per peak input voltage of the chirp waveform. The coupled electromechanical model is then validated experimentally through both frequency response and transient measurements. The technique is potentially applicable to situations where a large and reasonably localised transient response is required on a beam or plate-like structure using minimal instrumentation.

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Section: Accepted Manuscriptmentioning

confidence: 99%

A chirp excitation for focussing flexural waves

Waters

2019

Journal of Sound and Vibration

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“…The average power consumption P av of a piezoelectric actuator can be estimated by equation 5 [13], [35].…”

Section: B Analyticalmentioning

confidence: 99%

Multimodal Shear Wave Deicing Using Fibre Piezoelectric Actuator on Composite for Aircraft Wings

Shi

Jia

2018

IEEE/ASME Trans. Mechatron.

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The formation and accretion of ice on aircraft wings during flight can be potentially disastrous and existing in-flight de-icing methods are either bulky or power consuming. This paper investigates the use of shear wave de-icing driven by a macro fibre piezoelectric composite actuator on a composite plate typically used for aircraft wings. While the few existing research on this novel de-icing approach focused on either theoretical studies or single frequency mode optimisation that required high excitation amplitudes, this study revealed that the use of multimodal excitation through broadband frequency sweeps has the potential to promote the chance of shear stress induced de-icing at a relatively small excitation amplitude. The results reported here form the foundation for a pathway towards low power and lightweight de-icing mechanism for in-flight aircraft wings.Index Terms-De-icing, shear wave, piezoelectric, carbon fibre reinforced plastic (CFRP), macro fibre composite (MFC)

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“…42 It was proved by finite element methods that the excited interface shear stress result in the interfacial shear strength failure. 43–47 In experiments, the ice layer adhered on the metal plate was instantly separated by the ultrasonic transducer. 48–52 By finite element methods and experiments, a lot of research on ultrasonic deicing/defrosting has been done.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and prediction models for interfacial shear separation of claddings excited by Love waves

Guo

2021

Advances in Mechanical Engineering

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The forced propagation solution of interfacial shear stress of multilayer cladding structure excited by Love waves is derived by the integral transformation method, and the shear resonance mechanism of interfacial separation is further revealed. The coupling resonance between the excitation frequency and structure intrinsic property causes the peak of interfacial shear stress amplitude, which results in interfacial shear separation at certain frequency bands. It is found that the coupling resonance frequency of interfacial shear stress is only dependent on the inherent properties of the structure, around which the frequency band of interfacial shear separation is formed. The coupling resonance frequency decreases with the increase of the cladding thickness or shear wave velocity difference between the cladding and substrate. The influence of cladding material parameters on interfacial shear stress is greater than that of matrix material parameters. The experimental results support the theoretical analysis results. The conclusions presented could have potential applications in ultrasonic deicing/defrosting/de-sanding and/or coatings protection.

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Delamination of surface accretions with structural waves: Piezo-actuation and power requirements

Cited by 11 publications

References 24 publications

A chirp excitation for focussing flexural waves

A chirp excitation for focussing flexural waves

Multimodal Shear Wave Deicing Using Fibre Piezoelectric Actuator on Composite for Aircraft Wings

Mechanism and prediction models for interfacial shear separation of claddings excited by Love waves

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