Damage detection technique by measuring laser-based mechanical impedance

This paper presents a proof of concept for simultaneous load and structural health monitoring of a hybrid carbon fiber rudder stock sample consisting of carbon fiber composite and metallic parts in order to demonstrate smart sensors in the context of maritime systems. Therefore, a strain gauge is used to assess bending loads during quasi-static laboratory testing. In addition, six piezoelectric transducers are placed around the circumference of the tubular structure for damage detection based on the electro-mechanical impedance (EMI) method. A damage indicator has been defined that exploits the real and imaginary parts of the admittance for the detection of pin failure in the rudder stock. In particular, higher frequencies in the EMI spectrum contain valuable information about damage. Finally, the information about damage and load are merged in a cluster analysis enabling damage detection under load.

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Mechanical impedance-based technique for steel structural corrosion damage detection

Measurement ◽

10.1016/j.measurement.2016.01.041 ◽

2016 ◽

Vol 88 ◽

pp. 353-359 ◽

Cited By ~ 30

Author(s):

Hongping Zhu ◽

Hui Luo ◽

Demi Ai ◽

Chao Wang

Keyword(s):

Damage Detection ◽

Mechanical Impedance ◽

Corrosion Damage

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A technique for improving the damage detection ability of the electro-mechanical impedance method on concrete structures

Smart Materials and Structures ◽

10.1088/0964-1726/21/8/085024 ◽

2012 ◽

Vol 21 (8) ◽

pp. 085024 ◽

Cited By ~ 22

Author(s):

S Na ◽

H K Lee

Keyword(s):

Damage Detection ◽

Concrete Structures ◽

Mechanical Impedance ◽

Impedance Method ◽

Detection Ability

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Vibration Based Structural Damage Detection Technique using Particle Swarm Optimization with Incremental Swarm Size

International Journal of Aeronautical and Space Sciences ◽

10.5139/ijass.2012.13.3.323 ◽

2012 ◽

Vol 13 (3) ◽

pp. 323-331 ◽

Cited By ~ 10

Author(s):

Bharadwaj Nanda ◽

Damodar Maity ◽

Dipak Kumar Maiti

Keyword(s):

Particle Swarm Optimization ◽

Damage Detection ◽

Structural Damage ◽

Particle Swarm ◽

Detection Technique ◽

Structural Damage Detection ◽

Swarm Optimization ◽

Swarm Size

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Cracking Diagnosis in Fiber-Reinforced Concrete with Synthetic Fibers Using Piezoelectric Transducers

Fibers ◽

10.3390/fib10010005 ◽

2022 ◽

Vol 10 (1) ◽

pp. 5

Author(s):

Maristella E. Voutetaki ◽

Maria C. Naoum ◽

Nikos A. Papadopoulos ◽

Constantin E. Chalioris

Keyword(s):

Reinforced Concrete ◽

Damage Detection ◽

Mechanical Impedance ◽

Harmonic Excitation ◽

Fiber Reinforced Concrete ◽

Repeated Loading ◽

Fiber Reinforced ◽

Damage Diagnosis ◽

Promising Alternative ◽

Synthetic Fibers

The addition of short fibers in concrete mass offers a composite material with advanced properties, and fiber-reinforced concrete (FRC) is a promising alternative in civil engineering applications. Recently, structural health monitoring (SHM) and damage diagnosis of FRC has received increasing attention. In this work, the effectiveness of a wireless SHM system to detect damage due to cracking is addressed in FRC with synthetic fibers under compressive repeated load. In FRC structural members, cracking propagates in small and thin cracks due to the presence of the dispersed fibers and, therefore, the challenge of damage detection is increasing. An experimental investigation on standard 150 mm cubes made of FRC is applied at specific and loading levels where the cracks probably developed in the inner part of the specimens, whereas no visible cracks appeared on their surface. A network of small PZT patches, mounted to the surface of the FRC specimen, provides dual-sensing function. The remotely controlled monitoring system vibrates the PZT patches, acting as actuators by an amplified harmonic excitation voltage. Simultaneously, it monitors the signal of the same PZTs acting as sensors and, after processing the voltage frequency response of the PZTs, it transmits them wirelessly and in real time. FRC cracking due to repeated loading ad various compressive stress levels induces change in the mechanical impedance, causing a corresponding change on the signal of each PZT. The influence of the added synthetic fibers on the compressive behavior and the damage-detection procedure is examined and discussed. In addition, the effectiveness of the proposed damage-diagnosis approach for the prognosis of final cracking performance and failure is investigated. The objectives of the study also include the development of a reliable quantitative assessment of damage using the statistical index values at various points of PZT measurements.

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Damage Detection Using Impedance Measurement With Magnetic Transducer

Volume 1: Active Materials, Mechanics and Behavior; Modeling, Simulation and Control ◽

10.1115/smasis2009-1414 ◽

2009 ◽

Author(s):

X. Wang ◽

J. Tang

Keyword(s):

Damage Detection ◽

Experimental Studies ◽

Impedance Measurement ◽

Mechanical Impedance ◽

Design Guidelines ◽

Impedance Method ◽

Negative Effects ◽

Mechanical Coupling ◽

Magnetic Impedance ◽

Magnetic Transducer

Impedance method has been explored for damage detection and identification. Typically, when the impedance sensor is integrated onto the mechanical structure to be monitored, its electrical impedance is directly related to the mechanical impedance of the host structure. Thus the change of impedance measurement before and after damage occurrence can be used as the damage indicator. Since the impedance information may be measured at relatively high frequency range, the impedance method could be sensitive to small-sized damage. Generally, piezoelectric transducers are employed in the impedance approach, which can serve as actuator and sensor simultaneously. In this research, a magnetic transducer approach is investigated for impedance based damage detection. To provide design guidelines, the analytical model of the resistive magnetic impedance measurement circuit is formulated. During the formulation, the two-way magneto-mechanical coupling between the transducer and the structure is systematically studied by using the Maxwell’s equations. The preliminary sensor enhancement is achieved by selecting the number of turns of wire in the electrical coil. Moreover, in order to reduce the negative effects of the high inherent inductance and large parasitic resistance of the coil with a large number of turns of wire, a new measurement circuitry is proposed, in which a negative resistive element and a capacitor are introduced to be serially connected with the original resistive circuit. Correlated numerical and experimental studies are carried out to validate the magnetic transducer in impedance based damage detection.

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