Automation in Structural Health Monitoring Using Laser Doppler Vibrometer

2007 ◽  
Author(s):  
Vinod Sharma ◽  
Shannon Statham ◽  
Massimo Ruzzene ◽  
Sathya Hanagud ◽  
Brian Glass
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
Structural Health

scholarly journals Towards airborne laser Doppler vibrometry for structural health monitoring of large and curved structures

2021 ◽  
Vol 63 (5) ◽  
pp. 280-282
Author(s):  
M Schewe ◽  
M A A Ismail ◽  
C Rembe
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Laser Doppler Vibrometer ◽  
Laser Doppler ◽  
Laser Doppler Vibrometry ◽  
Structural Health ◽  
Curved Structures ◽  
Sensing Technology ◽  
Reflective Mirror ◽  
Historic Structures

Laser Doppler vibrometry is an important sensing technology for many structural health monitoring (SHM) methods, such as modal analysis. However, when it comes to large civil structures, for example historic structures and bridges, the applicability of laser Doppler vibrometry is significantly constrained by inaccessible remote surfaces. Some of these surfaces are fully inaccessible to a ground-mounted laser Doppler vibrometer (LDV), while others are partially inaccessible, and measurements are only possible for low incident angles. Consequently, LDV measurements are either impossible or have a weak signal strength. In this study, the concept of constructing an airborne LDV for SHM is explored, including the examination of a recently developed mechanism, the partially airborne LDV, comprising a reflective mirror attached to a drone. Preliminary proof of concept laboratory tests have been successfully conducted using two different set-ups and drone models.

A Review of Laser Doppler Vibrometry for Structural Health Monitoring Applications

2012 ◽  
Vol 518 ◽  
pp. 1-15 ◽  
Author(s):  
Wieslaw Jerzy Staszewski ◽  
Ruztamreen bin Jenal ◽  
Andrzej Klepka ◽  
Mariusz Szwedo ◽  
Tadeusz Uhl
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Laser Doppler ◽  
Laser Doppler Vibrometry ◽  
Structural Health ◽  
Measuring Techniques ◽  
Monitoring Applications ◽  
Ultrasound Measurements ◽  
Out Of Plane ◽  
Optical Laser

Non-contact optical/laser measuring techniques are very attractive in many engineering applications. The paper demonstrates examples related to structural health monitoring. Various methods based on strain, vibration and ultrasound measurements are presented together with relevant references. Applications examples utilise in-plane and out-of-plane measurements taken by 1-D and 3-D laser Doppler vibrometers.

scholarly journals Multiphysics Finite Element Analysis of In-Pile Sensors for Advanced Nuclear Reactors

2020 ◽  
Author(s):  
Takoda Linn Bingham
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Health Monitoring ◽  
Acoustic Wave ◽  
Health Monitoring ◽  
Nuclear Reactors ◽  
Laser Doppler Vibrometer ◽  
Acoustic Sensors ◽  
Element Analysis ◽  
Structural Health

Nuclear reactors have large needs for in-pile sensors that are durable in high temperature, radioactive, and corrosive environments. With the use of multiphysics finite element analysis (FEA) researchers can speed up sensor prototyping. FEA also allows for a better fundamental understanding of sensors and enables sensor optimization. This research focuses on three types of in-pile sensors developed at Idaho National Laboratory: acoustic sensors, linear variable differential transformers (LVDT), and capacitance based strain gauges (CSG). Two acoustic sensors, magnetostrictive waveguides and piezoelectric surface acoustic wave (SAW) sensors were first modeled. These models showed the acoustic wave patterns and estimated the speed of sound. The modeling results were compared to results from laser Doppler vibrometer testing. The model was implemented to enhance the performance of the sensor designs. This research then modeled a LVDT sensor used to measure fuel rod deformation and structural health monitoring. A parametric FEA study was completed for the purpose of sensor miniaturization. The FEA model was also used to investigate the potential of adding a fiber optic cable through the LVDT core. This research eventually modeled CSGs used in nondestructive structural health monitoring. Multiphysics models were used to investigate the discrepancies in experiments and previous analytical models.

Selective generation of ultrasonic guided waves for damage detection in rectangular bars

2020 ◽  
pp. 147592172094740
Author(s):  
Valentin Serey ◽  
Nicolas Quaegebeur ◽  
Mathieu Renier ◽  
Philippe Micheau ◽  
Patrice Masson ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Guided Waves ◽  
Infinite Plate ◽  
Laser Doppler Vibrometer ◽  
Single Mode ◽  
Ultrasonic Guided Waves ◽  
Structural Health ◽  
Selective Generation ◽  
Mode Generation

Ultrasonic guided waves are used in non-destructive testing and structural health monitoring solutions for long-range inspection, in applications ranging from Civil Engineering to Aerospace. In order to ease the inspection process, it is generally preferable to generate a carefully selected single mode. Although single mode Lamb wave generation is not difficult to achieve in infinite plate-like structures, with carefully polarized or sized piezoceramic elements, for example, such selective generation is much more difficult in a rectangular bar. In this article, we consider the propagation along a thin plate of finite rectangular cross section, which corresponds to a rectangular bar. The finite lateral width leads to a greater density of modes compared to an infinite plate. The authors have previously addressed this matter and developed a methodology for the selective generation of modes in the harmonic regime. This article extends this methodology to selective mode generation for finite time excitation, such as bursts. Results are presented for single mode generation of A0,0 and A0,1 in an aluminum bar instrumented with eight piezoelectric transducers. The waveguide modal basis is calculated with the two-dimensional semi-analytical finite element method, and measurements are conducted using a three-dimensional laser-Doppler vibrometer. To illustrate the potential of the method for structural health monitoring purposes, the detection of a defect simulated by a pair of magnets placed at various positions over the bar width is demonstrated.

scholarly journals On the Application of Laser Vibrometry to Perform Structural Health Monitoring in Non-Stationary Conditions of a Hydropower Dam

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3811 ◽  
Author(s):  
Mateja Klun ◽  
Dejan Zupan ◽  
Jože Lopatič ◽  
Andrej Kryžanowski
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Rapid Development ◽  
Laser Doppler Vibrometer ◽  
Vibration Monitoring ◽  
Hydropower Plant ◽  
Structural Vibration ◽  
Measurement Technology ◽  
Structural Health ◽  
Stationary Conditions

This paper presents the first application of the Laser Doppler Vibrometer (LDV) in non-stationary conditions within a hydropower plant powerhouse. The aim of this research is to develop a methodology to include non-contact vibration monitoring as part of structural health monitoring of concrete dams. We have performed in-situ structural vibration measurements on the run-of-the-river Brežice dam in Slovenia during the start-up tests and regular operation. In recent decades, the rapid development of laser measurement technology has provided powerful methods for a variety of measuring tasks. Despite these recent developments, the use of lasers for measuring has been limited to sites provided with stationary conditions. This paper explains the elimination of pseudo-vibration and measurement noise inherent in the non-stationary conditions of the site. Upon removal of the noise, fatigue of the different structural elements of the powerhouse could be identified if significant changes over time are observed in the eigenfrequencies. The use of laser technology is to complement the regular monitoring activities on large dams, since observation and analysis of integrity parameters provide indispensable information for decision making and maintaining good structural health of ageing dams.

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