Piezo-micro-ultrasound-transducers for air-coupled arrays: Modeling and experiments in the linear and non-linear regimes

Massimino, Gianluca; Colombo, Alessandro; Ardito, Raffaele; Quaglia, Fabio; Corigliano, Alberto

doi:10.1016/j.eml.2020.100968

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…Applications to real-world engineering problems are numerous and tend to increase since lightweight thinner structures are being increasingly used. The range of applications thus spans from aeronautics to transportation industry [114,163,179,216,224,226,232,271], wind energy systems [74,160], musical instruments [30,106,184] and micro-/nanoelectromechanical systems (M/NEMS), in which those nonlinearities must be mastered to design efficient structures [61,138,164,245,322]. The vibratory phenomena arising from the nonlinear dynamics of geometrically nonlinear structures can also be intentionally used for the purpose of new designs, especially in the M/NEMS domain or for energy harvesting, where for example internal resonances or parametric driving are conceived with specific goals [58,96,148,157,231,248,258,270,319].…”

Section: Introductionmentioning

confidence: 99%

Model order reduction methods for geometrically nonlinear structures: a review of nonlinear techniques

2021

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This paper aims at reviewing nonlinear methods for model order reduction in structures with geometric nonlinearity, with a special emphasis on the techniques based on invariant manifold theory. Nonlinear methods differ from linear-based techniques by their use of a nonlinear mapping instead of adding new vectors to enlarge the projection basis. Invariant manifolds have been first introduced in vibration theory within the context of nonlinear normal modes and have been initially computed from the modal basis, using either a graph representation or a normal form approach to compute mappings and reduced dynamics. These developments are first recalled following a historical perspective, where the main applications were first oriented toward structural models that can be expressed thanks to partial differential equations. They are then replaced in the more general context of the parametrisation of invariant manifold that allows unifying the approaches. Then, the specific case of structures dis-C. Touzé (B)

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Section: Introductionmentioning

confidence: 99%

Model order reduction methods for geometrically nonlinear structures: a review of nonlinear techniques

2021

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“…PMUTs are Micro-Electro-Mechanical Systems (MEMS)-based piezoelectric ultrasonic transducers generating ultrasonic waves that can propagate in air [ 15 , 16 , 17 , 18 , 19 , 20 ], liquid [ 21 , 22 , 23 ], or solid media [ 24 ]. Piezoelectric materials are used in a wide range of smart micro-systems [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

PMUTs Arrays for Structural Health Monitoring of Bolted-Joints

et al. 2023

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Micro-electro-mechanical systems (MEMS) have enabled new techniques for the miniaturization of sensors suitable for Structural Health Monitoring (SHM) applications. In this study, MEMS-based sensors, specifically Piezoelectric Micromachined Ultrasonic Transducers (PMUT), are used to evaluate and monitor the pre-tensioning of a bolted joint structural system. For bolted joints to function properly, it is essential to maintain a suitable level of pre-tensioning. In this work, an array of PMUTs attached to the head and to the end of a bolt, serve as transmitter and receiver, respectively, in a pitch-catch Ultrasonic Testing (UT) scenario. The primary objective is to detect the Change in Time of Flight (CTOF) of the acoustic wave generated by the PMUT array and propagating along the bolt’s axis between a non-loaded bolt and a bolt in service. To model the pre-tensioning of bolted joints and the transmission of the acoustic wave to and from a group of PMUTs through the bolt, a set of numerical models is created. The CTOF is found to be linearly related to the amount of pre-tensioning. The numerical model is validated through comparisons with the results of a preliminary experimental campaign.

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“…Micromachined ultrasonic transducers (MUTs) with a flexible diaphragm structure [10]- [12], have recently been identified as a promising alternative to conventional ultrasonic transducers due to their good acoustic impedance matching [13], [14], broad bandwidth [15], [16], inexpensive array fabrication, and ease of integration with supporting electronics [14], [17]- [19]. Piezoelectric micromachined ultrasonic transducers (PMUTs), which are generally diaphragm-like thin film flexural transducers manufactured on silicon substrates, are a possible option for integrated transducer arrays [20]- [22].…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Numerical Study of Crosstalk Effects in PMUT Arrays

Abdalla,

Massimino,

D’Argenzio

et al. 2023

IEEE Sensors J.

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This study provides a comprehensive characterization of a 4 × 4 PMUT array suited for in-air applications. Crosstalk can be viewed as a lack of isolation among the transducers, with possible reasons including the electrical, acoustic, and structural coupling among the transducers. This study focuses on acoustic coupling as the primary cause of crosstalk, since the influence of electrical and structural coupling on crosstalk is shown to be negligible by comparing experimental tests and numerical analysis conducted in vacuum and in air. It is expected that acoustic coupling among diaphragms occurs due to air-connected cavities. Consequently, several scenarios are investigated in which the cavities are either partially or completely acoustically disconnected. The computed response spectra of the PMUTs demonstrate that the presence of secondary peaks, which indicated the presence of crosstalk, is diminished when the PMUTs are decoupled partially or completely as compared to an open cavity. The conducted acoustic tests also demonstrated that crosstalk impacts the intensity and directivity of the acoustic wave produced by the array.

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Piezo-micro-ultrasound-transducers for air-coupled arrays: Modeling and experiments in the linear and non-linear regimes

Cited by 12 publications

References 35 publications

Model order reduction methods for geometrically nonlinear structures: a review of nonlinear techniques

Model order reduction methods for geometrically nonlinear structures: a review of nonlinear techniques

PMUTs Arrays for Structural Health Monitoring of Bolted-Joints

An Experimental and Numerical Study of Crosstalk Effects in PMUT Arrays

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