Results 161 to 170 of about 11,815 (201)
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Non-axisymmetric Lamb wave excitation by piezoelectric wafer active sensors
Sensors and Actuators A: Physical, 2012Abstract A Lamb wave-based structural health monitoring system requires the exact knowledge of the dynamical behavior of piezoelectric actuators. Since piezoelectric wafer active sensors (PWASs) with a disk-wrapped electrode are used in many practical applications, a detailed description of the radiation field is essential to enhance the damage ...
Jochen Moll +4 more
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Piezoelectric Wafer Embedded Active Sensors for Aging Aircraft Structural Health Monitoring
Structural Health Monitoring, 2002Piezoelectric wafer active sensors may be applied on aging aircraft structures to monitor the onset and progress of structural damage such as fatigue cracks and corrosion. The state of the art in piezoelectric-wafer active sensors structural health monitoring and damage detection is reviewed.
Victor Giurgiutiu +2 more
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Piezoelectric wafer active sensors for in situ ultrasonic‐guided wave SHM
Fatigue & Fracture of Engineering Materials & Structures, 2008ABSTRACTIn situ structural health monitoring aims to perform on‐demand interrogation of the structure to determine the presence of service‐induced damage and defects using non‐destructive evaluation ultrasonic wave methods. Recently emerged piezoelectric wafer active sensors (PWAS) have the potential to significantly improve damage detection and health
L. YU +4 more
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Guided waves sensing with piezoelectric wafer active sensors
AIP Conference Proceedings, 2020Guided-wave based structural health monitoring methods employ piezoelectric wafer active sensors (PWAS) to excite and record guided waves. A mathematical model simulating the dynamics of a structure with two PWASs operating as an actuator and a sensor is presented.
A. N. Shpak +4 more
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Piezoelectric wafer active sensor guided wave imaging
SPIE Proceedings, 2010Active sensing methods use actuators/sensors permanently attached to the structure to generate guided waves and measure the arrival waves propagating through the structures. The damage diagnosis is performed through the examination of the arrival waves carrying structural features.
Lingyu Yu, Victor Giurgiutiu
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Temperature Effects on Piezoelectric Wafer Active Sensors
Volume 6A: Materials and Fabrication, 2015This paper discusses the temperature effects of using piezoelectric wafer active sensors (PWAS) technologies for structural health monitoring (SHM) in pressure vessels and piping (PVP) applications, e.g. dry cast storage system (DCSS). The research into monitoring of DCSS health has experienced a dramatic increase following the issuance of the Blue ...
Linlin Ma +3 more
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Detection of Cracks Using Piezoelectric Wafer Active Sensors
Key Engineering Materials, 2005The capability of piezoelectric wafer active sensors to identifying cracks which are common to metallic structural elements subjected to fatigue loading were explored. A number of laboratory tests were performed to investigate Lamb wave transmission and reception characteristics as well as the sensitivity of the transmitted and reflected signals to the
Blazewicz, A. +2 more
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Characterization of piezoelectric wafer active sensor for acoustic emission sensing
Ultrasonics, 2019In this article, a new avenue of using the piezoelectric wafer active sensor (PWAS) for detecting the fatigue crack generated acoustic emission (AE) signals is presented. In-situ AE-fatigue experiments were conducted using PWAS along with two commercially available AE sensors.
Yeasin Bhuiyan +2 more
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Active carbon filter health condition detection with piezoelectric wafer active sensors
SPIE Proceedings, 2011The impregnated active carbon used in air purification systems degrades over time due to exposure to contamination and mechanical effects (packing, settling, flow channeling, etc.). A novel approach is proposed to detect contamination in active carbon filters by combining the electromechanical impedance spectroscopy (EMIS) and electrochemical ...
Jingjing Bao +4 more
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Radiation, temperature, and vacuum effects on piezoelectric wafer active sensors
Smart Materials and Structures, 2016The effect of radiation, temperature, and vacuum (RTV) on piezoelectric wafer active sensors (PWASs) is discussed. This study is relevant for extending structural health monitoring (SHM) methods to space vehicle applications that are likely to be subjected to harsh environmental conditions such as extreme temperatures (hot and cold), cosmic radiation ...
Giurgiutiu, Victor +2 more
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