3D-Printable Piezoelectric Composite Sensors for Acoustically Adapted Guided Ultrasonic Wave Detection

Roloff, Thomas; Mitkus, Rytis; Lion, Jann Niklas; Sinapius, Michael

doi:10.3390/s22186964

Cited by 8 publications

(3 citation statements)

References 32 publications

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“… Experimental setup of 3D laser Doppler vibrometry measurement to separately determine in-plane and out-of-plane components of wave propagation after performing a coordinate transformation according to [ 45 ]. Figure adapted from [ 46 ]. …”

Section: Figurementioning

confidence: 99%

Influence of a Flat Polyimide Inlay on the Propagation of Guided Ultrasonic Waves in a Narrow GFRP-Specimen

et al. 2022

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Structural health monitoring systems for composite laminates using guided ultrasonic waves become more versatile with the structural integration of sensors. However, the data generated within these sensors have to be transmitted from the laminate to the outside, where polyimide-based printed circuit boards play a major role. This study investigates, to what extent integrated polyimide inlays with applied sensor bodies influence the guided ultrasonic wave propagation in glass fiber-reinforced polymer specimens. For reasons of resource efficiency, narrow specimens are used. Numerical simulations of a damping-free specimen indicate reflections of the S0-mode at the integrated inlay. This is validated experimentally with an air-coupled ultrasonic technique and a 3D laser Doppler vibrometry measurement. The experimental data are evaluated with a method including temporal and spatial continuous wavelet transformations to clearly identify periodically occurring wave packages as edge reflections and distinguish them from possible inlay reflections. However, even when separating in-plane and out-of-plane movements using the 3D measurement, no reflections at the inlays are detected. This leads to the conclusion that polyimide inlays are well suited as substrates for printed circuit boards integrated into fiber-reinforced polymer structures for structural health monitoring, since they do not significantly influence the wave propagation.

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Section: Figurementioning

confidence: 99%

Influence of a Flat Polyimide Inlay on the Propagation of Guided Ultrasonic Waves in a Narrow GFRP-Specimen

et al. 2022

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“…Studies regarding the distortion of wave fields by means of a single obstacle (i.e. a sensor) were performed for 3D-printable piezoelectric composite sensors with acoustically adapted material properties (Roloff et al, 2022) and sensors with different shapes. Exemplary shapes of current practical relevance are circular, elliptical, rectangular or lozenge shapes, respectively (see Figure 1).…”

Section: Introductionmentioning

confidence: 99%

A numerical study on planar gradient acoustic impedance matching for guided ultrasonic wave detection

Rottmann

Roloff

Rauter

et al. 2023

Journal of Vibration and Control

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Increasing the service-life of engineering structures such as aeroplanes is a major issue in order to enhance their cost-effectiveness and to reduce the carbon footprint. One possibility to achieve this goal is to determine the current structural health state and to derive respective measures in order to increase the structure’s technical reliability. For doing so, a structural health monitoring system consisting of both an actuator and a sensor network may be applied. Whereas the actuator induces a wave field of guided ultrasonic waves, the measuring data of the sensors allows to determine the health state of the respective structure. However, both actuators and sensors in most cases distort these wave fields. This distortion may lead to false-detection of damage: both the number and severity of damage may be over- or underestimated. The former leads to an unnecessary high effort for retrofitting the structure, whereas the latter reduces the structure’s technical reliability. Several measures exist in order to avoid such false-detections. In the present contribution, focus is set on reducing the distortion of the wave field which is caused by an embedded sensor. The reduced distortion of the wave field is achieved by an acoustic impedance matching with a functionally graded material which is based on a mechanical model. The approach additionally results in amplified measuring signals of the sensor. The applicability of the proposed approach is shown by means of a numerical study.

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“…Studies on the distortion of wave fields by sensors with different shapes have been carried out by Roloff et al. [6]. It is referred to Refs.…”

Section: Introductionmentioning

confidence: 99%

An approach for improving SHM systems with GUW detection and embedded sensors by a planar gradient acoustic impedance matching

Rottmann,

Weber

2023

Proc Appl Math and Mech

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For technical structures, such as airplanes, the service life must be increased to satisfy the requirements for high efficiency in terms of costs and sustainability. Monitoring the system's current health and providing solutions to maintain it reliably is one way to accomplish this objective. A structural health monitoring system, in which actuators induce a guided ultrasonic wave or wavefield monitored by a sensor or a network of sensors, is a standard for thin‐walled structures, which are made of, for example, fibre‐metal‐laminates. The sensor measurements provide information that can be used to determine the respective health state of the system. However, embedding the actuator and sensors in the system typically results in a distortion of the wavefield, for example, mode‐conversion and reflections. The distortion can lead to over‐ or underestimation of the quantity, location and severity of the damage. Due to these false detections, both an unnecessary high effort for retrofitting the structure and a reduction of the structure's technical reliability may be needed. The objective of the current contribution is to reduce the wave‐field distortion/reflections caused by the sensors to prevent or minimise these false detections. To reduce the distortion and reflection of the wavefield, a functionally graded material with an acoustic impedance matching based on a mechanical model is used. In order to control and adjust the acoustic impedance, which is the leading parameter concerning distortion and reflections of waves, tungsten particles were added to the uncured epoxy resin. The design of an interphase between the sensor or its glass housing and the surrounding structure is achieved by this novel approach. The interphase properties are varying in the radial direction to the sensor and are depending on the tungsten particle content in the epoxy resin. In this work, several models regarding the radial distribution of the tungsten particle content and the excitation frequency are investigated. Additionally, the dependence on geometrical influence is also addressed. The approach results, for specific configurations, in (i) reduced reflections from the sensor (less distortion) and (ii) amplified measuring signals of the sensor. Numerous numerical examples demonstrate the benefit of the presented approach.

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3D-Printable Piezoelectric Composite Sensors for Acoustically Adapted Guided Ultrasonic Wave Detection

Cited by 8 publications

References 32 publications

Influence of a Flat Polyimide Inlay on the Propagation of Guided Ultrasonic Waves in a Narrow GFRP-Specimen

Influence of a Flat Polyimide Inlay on the Propagation of Guided Ultrasonic Waves in a Narrow GFRP-Specimen

A numerical study on planar gradient acoustic impedance matching for guided ultrasonic wave detection

An approach for improving SHM systems with GUW detection and embedded sensors by a planar gradient acoustic impedance matching

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