Alessandro Sabato

Alessandro Sabato
University of Massachusetts Lowell | UML · Department of Mechanical Engineering

Ph.D. Mechanical Engineering

About

64
Publications
25,055
Reads
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632
Citations
Introduction
The majority of the experimental and analytical research I have performed lays in the fields of acoustics, structural dynamics, non-destructive evaluation, and sensor-based structural health monitoring. I am a strong advocate of applying new advanced technologies (e.g. Micro Electro-Mechanical Systems, Unmanned Aerial Vehicle, and Wireless Sensor Network) and last-generation measurement techniques (e.g. non-contact measurement methods) to solve real-world, engineering-related problems.
Additional affiliations
September 2018 - December 2018
University of Massachusetts Lowell
Position
  • Professor
October 2015 - present
University of Massachusetts Lowell
Position
  • Post-Doctoral Research Associate Fellow
Description
  • • Designed a vision-based system for railroad tracks SHM • Tested 3D-DIC UAV system for bridges SHM • Refined NDT techniques using IRT for wind-turbine blades SHM • Development of a UT for structural dynamic excitation • Mentored MS and PhD students.
September 2014 - June 2015
Università della Calabria
Position
  • Research Assistant
Description
  • Lectured in Graduate and Doctoral-level classes on"Noise and Electromagnetic Pollution".
Education
February 2012 - December 2014
Università della Calabria
Field of study
  • Mechanical Engineering
January 2007 - April 2010
Università della Calabria
Field of study
  • Environmental Engineering
September 2003 - December 2006
Università della Calabria
Field of study
  • Environmental Engineering

Publications

Publications (64)
Article
Structural aging or inefficient design affects the energy efficiency of buildings in the United States. Infrared thermography (IRT) in conjunction with unmanned aerial vehicle (UAV) followed by point cloud (PC) reconstruction can be used to generate renderings of structures that highlight areas of excessive heat loss. This work represents the first...
Article
Full-text available
Roadways' sub-pavement voids caused by eroded soil through damaged culverts lead to safety hazards, traffic inconvenience, and expensive repairs. Infrared thermography (IRT) could help to identify those voids before the structural integrity of roadway pavements is compromised. However, IRT suffers from poor signal-to-noise ratio. This study impleme...
Article
Full-text available
In recent years, three-dimensional Digital Image Correlation (3D-DIC) has proven to be a reliable technique for Structural Health Monitoring (SHM) by allowing full line-of-sight, high-resolution, and contactless measurements of structures. The large amount of raw output resulting from 3D-DIC requires appropriate methods to visualise and analyse the...
Article
Non-destructive evaluation (NDE) has become a reliable inspection tool to detect structural flaws in many engineering domains. Similarly, advancements in computer-vision made it possible to assess structural conditions from a set of digital images. This research introduces a novel inspection technique for detecting subsurface defects that cause hea...
Article
Full-text available
Wind turbine blade certification requires static and fatigue testing at a large‐scale facility similar to the Wind Technology Testing Center (WTTC) located in Charlestown, Massachusetts. Usually, these tests are conducted by using wire‐based sensors such as strain gages, accelerometers, and string potentiometers. These systems are expensive, requir...
Article
Full-text available
Advancements in computer-vision methods have made stereophotogrammetry and three-dimensional digital image correlation (3D-DIC) attractive tools for Structural Health Monitoring (SHM). Nonetheless, optical approaches are not always well suited for quantitative measurement on large-scale structures due to the challenging calibration process of the c...
Article
Full-text available
This paper examines different concepts in relation to the picture-frame test for shear characterization of a woven prepreg fabric. The influence of the sample arms is investigated by means of cut slits as well as removed transverse tows. Shear angles are obtained using Digital Image Correlation (DIC) and also from images taken during the test which...
Article
Full-text available
Utility-scale wind turbine blades (WTBs) require proper certification to ensure that they meet the design specifications and for safe operation throughout their lifetime. Instrumentation during testing involves using wire-based sensors such as strain gauges and accelerometers. These systems are expensive, time-consuming to install, difficult to dep...
Article
Full-text available
The use of conventional modal excitation techniques (e.g., impact hammers, piezoelectric actuators, and mechanical shakers) may be challenging if high-frequency dynamic measurements on lightweight structures need to be performed. The use of the high-frequency radiation force generated by focused ultrasonic transducers (FUTs) can help to resolve thi...
Article
Full-text available
Conventional excitation techniques typically use an impact hammer, piezoelectric actuator, or mechanical shaker excitation for experimental modal testing. However, the use of these devices may be challenging if accurate high-frequency dynamic measurements on small or lightweight structural parts have to be performed. To overcome these problems, the...
Chapter
Full-text available
Monitoring and analyzing the integrity of structures, infrastructure, and machines is essential for economic, operational, and safety reasons. The assessment of structural integrity and dynamic conditions of those systems are important to ensure safe operation and achieve or even extend the design service life. Recent advancements in camera technol...
Conference Paper
Full-text available
The use of conventional modal excitation techniques (e.g., impact hammers, piezoelectric actuators, and mechanical shakers) may be challenging if high-frequency dynamic measurements on lightweight structures need to be performed. The use of the high-frequency radiation force generated by focused ultrasonic transducers (FUTs) can help to resolve thi...
Article
Full-text available
To increase the energy conversion efficiency and power production, the size of wind turbine blades has continued to grow larger. As such, the need to identify defects and monitor the structural health becomes more critical to maintain reliability and prevent costly catastrophic failures. Larger blades are subject to an increased likelihood of opera...
Conference Paper
Full-text available
The monitoring of civil, mechanical, and aerospace structures is important especially as these systems approach or surpass their design life. Often, Structural Health Monitoring (SHM) relies on sensing techniques for condition assessment. Advancements achieved in camera technology and optical sensors have made three-dimensional (3D) Digital Image C...
Data
The monitoring of civil, mechanical, and aerospace structures is important especially as these systems approach or surpass their design life. Often, Structural Health Monitoring (SHM) relies on sensing techniques for condition assessment. Advancements achieved in camera technology and optical sensors have made three-dimensional (3D) Digital Image C...
Conference Paper
Full-text available
Over the last two decades, wind turbine blades have been growing in size and the need to quickly test and certify new designs, as well as understand their structural dynamic behavior is more important than ever. Blade testing is performed in dedicated facilities where the mechanical properties are tested to demonstrate that the blades meet the desi...
Conference Paper
Full-text available
Traditional wire-based transducers (e.g. strain gages and accelerometers) are the main measurement tools in identifying the response of mechanical structures subjected to static and dynamic loading. These techniques are expensive, time consuming to install, and estimate the responses of the structure at only discrete number of points. To couple wit...
Article
Full-text available
Quantifying the condition of aging structures is important to verify structural integrity and long-term reliability. Structural health monitoring plays a key role in the prevention of catastrophic failure, in improving the safety of infrastructure, and in reducing the downtime and costs associated with their maintenance. Bridges are typically desig...
Conference Paper
Full-text available
Routinely, civil, mechanical, and aerospace structures continue to be used despite that they are approaching or have already exceeded their design life. Structural monitoring techniques have the ability to indicate the onset of or avoid failure. Conventional sensing techniques like visual inspection and sensors such as accelerometers, strain gages,...
Article
Full-text available
To date, conventional excitation techniques such as impact hammer or mechanical shaker excitations are commonly used in experimental modal testing. However, these excitations require that the excitation device be in direct contact with test articles, resulting in measurement distortions, particularly for small structures like MEMS cantilever. In ad...
Article
Full-text available
Bragg scattering is a well-known occurrence in structures containing periodically spaced obstructions. A urethane test panel, with periodically spaced aluminum ribs, was built to study the possibility of using Bragg scattered responses to localize acoustic underwatersignals. The presence of Bragg scatteredwaves may allow the size of an array to be...
Data
Track failures due to cross tie degradation or loss in ballast support may result in a number of problems ranging from simple service interruptions to derailments. Structural Health Monitoring (SHM) of railway track is important for safety reasons and to reduce downtime and maintenance costs. For this reason, novel and cost-effective track inspecti...
Conference Paper
Full-text available
Track failures due to cross tie degradation or loss in ballast support may result in a number of problems ranging from simple service interruptions to derailments. Structural Health Monitoring (SHM) of railway track is important for safety reasons and to reduce downtime and maintenance costs. For this reason, novel and cost-effective track inspecti...
Conference Paper
Full-text available
Civil engineering structures such as bridges, buildings, and tunnels continue to be used despite aging and deterioration well past their design life. In 2013, the American Society of Civil Engineers (ASCE) rated the state of the U.S. bridges as mediocre, despite the $12.8 billion USD annually invested. Traditional inspection and monitoring techniqu...
Article
Full-text available
Abstract Structural health monitoring (SHM) of aging railway tracks is important for safety, to prevent catastrophic failure, and to reduce maintenance costs. The tracks and foundations are complex systems that may contain defects or damage including internal rail cracks, pitting or surface erosion, degradation of ballast support, or railway crosst...
Conference Paper
Full-text available
Conventional excitation techniques such as modal impact hammer and shakers are commonly used in experimental modal testing. However, these excitation approaches require the excitation device to be in direct contact with test articles. It can result in distorted measurements, particularly for small structures, such as a MEMS cantilever and thumb nai...
Article
Full-text available
Monitoring and analysing the integrity of structures and machinery is important for economic, operational, and mission critical reasons. In recent years, there has been growing interest in performing Structural Health Monitoring (SHM) by monitoring structural dynamic response via Micro Electro- Mechanical System (MEMS) accelerometers. In addition,...
Presentation
Railroads experience different track failure mechanisms, which may cause problems ranging from service interruptions to derailments. With reference to the crossties-ballast system, one of the most acknowledged high-risk scenarios is the center binding condition, a situation in which the support of the ballast under the crossties is initially concen...
Conference Paper
Full-text available
Railroads experience different track failure mechanisms, which may cause problems ranging from service interruptions to derailments. With reference to the crossties-ballast system, one of the most acknowledged high-risk scenarios is the center binding condition, a situation in which the support of the ballast under the crossties is initially concen...
Data
Railroads experience different track failure mechanisms, which may cause problems ranging from service interruptions to derailments. With reference to the crossties-ballast system, one of the most acknowledged high-risk scenarios is the center binding condition, a situation in which the support of the ballast under the crossties is initially concen...
Article
Full-text available
The dynamic focused ultrasound radiation force has been recently used for excitation of structures with sizes ranging from micro to macro scale having a frequency bandwidth between tens of Hertz and up to 100 kHz. Therefore it can potentially be used as an alternative non-contact excitation method for conventional contact type excitations such as m...
Conference Paper
Full-text available
Road traffic has become a prominent feature of many urban areas and one of the dominant sources of community noise exposure. For this reason, a great deal of attention should be paid to reduce noise as urban planning activities are performed. In the last decade, traffic-regulation devices have been widely used on city roads. Rumble strips have been...
Article
Full-text available
Structural health monitoring (SHM) plays an important role in maintaining system integrity of aging structures and machinery parts. Microelectromechanical system (MEMS) accelerometers, because of their low cost and small dimensions, have emerged as attractive sensing tools for monitoring structural condition based on changes in structural vibration...
Conference Paper
Full-text available
As civil infrastructure (i.e. bridges, railways, and tunnels) continues to age; the frequency and need to perform inspection more quickly on a broader scale increases. Traditional inspection and monitoring techniques (e.g., visual inspection, mechanical sounding, rebound hammer, cover meter, electrical potential measurements, ultrasound, and ground...
Conference Paper
Full-text available
Control aging structures and infrastructures is of importance as these systems may have economic and strategic relevance. Develop reliable and accurate instruments for monitoring the structural dynamic behavior plays a key role in predicting the onset of possible crisis scenarios. Recent advances in technology have made wireless Micro Electro-Mecha...
Data
In recent years, growing interest has been aroused by the possibility of monitoring wirelessly the dynamic response and the state of aging infrastructures. Micro Electro-Mechanical System (MEMS) based equipment has revealed to be an emerging technology for vibration monitoring of large-sized civil structures such as bridges and buildings. Once prob...
Conference Paper
Full-text available
In recent years, growing interest has been aroused by the possibility of monitoring wirelessly the dynamic response and the state of aging infrastructures. Micro Electro-Mechanical System (MEMS) based equipment has revealed to be an emerging technology for vibration monitoring of large-sized civil structures such as bridges and buildings. Once prob...
Presentation
In recent years, growing interest has been aroused by the possibility of monitoring wirelessly the dynamic response and the state of aging infrastructures. Micro Electro-Mechanical System (MEMS) based equipment has revealed to be an emerging technology for vibration monitoring of large-sized civil structures such as bridges and buildings. Once prob...
Conference Paper
Full-text available
Workers protection from risk arising from prolonged exposure to loud acoustic fields plays a key role in the safeguard of people physical and mental wellbeing. In workplaces, depending on level and time of exposition, annoyance or permanent damage may occur. Furthermore, other parameters su ch as impulsive events, spectral composition, and phenomen...
Article
Full-text available
Recent advances in the Micro Electro-Mechanical System (MEMS) technology have made wireless MEMS accelerometers an attractive tool for Structural Health Monitoring (SHM) of civil engineering structures. To date, sensors' low sensitivity and accuracy-especially at very low frequencies-have imposed serious limitations for their application in monitor...
Article
Full-text available
In Europe the protection of workers from damage arising from prolonged exposure to sources of noise is assured by Directive 2003/10/EC. This directive defines health and safety requirements and creates a minimum guaranteed level of protection for all European Community workers. Unfortunately, this legislation has a number of shortcomings, which ren...
Chapter
Full-text available
Risks arising from physical agents-such as noise pollution-are sometimes underrated or not treated in a suitable way. This happens especially when workplace wellbeing is considered. In Europe, security is ensured with the Directive 2003/10/EC of the European Parliament and of the Council of February 6 th , 2003 on the minimum health and safety requ...
Conference Paper
Full-text available
On the roads of many cities several retarding devices - as speed bumps - are placed to slow vehicles. Furthermore, close to obstacles and crossroads rumble strips are installed to keep the attention of drivers. Speed bumps usually are 5 to 15 cm high and 30 to 300 cm long; the biggest ones are called anti-speed bumps. These so called “raised areas”...
Data
On the roads of many cities several retarding devices - as speed bumps - are placed to slow vehicles. Furthermore, close to obstacles and crossroads rumble strips are installed to keep the attention of drivers. Speed bumps usually are 5 to 15 cm high and 30 to 300 cm long; the biggest ones are called anti-speed bumps. These so called “raised areas”...
Article
Full-text available
This project offers the opportunity to investigate oscillatory phenomena that can jeopardize the safety of structures of particular importance, using the accelerometers installed on small electromechanical (MEMS) devices known as Motes, which are devices that transmit data remotely without the need of using cable connections. The term ‘Motes’ usual...
Data
The aim of the project is to verify the applicability of MEMS wireless accelerometers to investigate oscillatory phenomena that can jeopardize the safety of structural elements and how these devices can perform environmental monitoring campaigns of vibration measurements. This to obtain a prototype sensor which data can be compared with those measu...
Data
The growing importance of noise pollution produced by urban road traffic needs a correct assessment of the acoustic climate of more or less extended built-up areas. According to what is stated in European Noise Directive 2002/49/EC the environmental noise indicators, based on equivalent sound pressure levels, should be measured or preferably calcul...
Conference Paper
Full-text available
Abstract - The aim of the project is to verify the applicability of MEMS wireless accelerometers to investigate oscillatory phenomena that can jeopardize the safety of structural elements and how these devices can perform environmental monitoring campaigns of vibration measurements. This to obtain a prototype sensor which data can be compared with...
Conference Paper
Full-text available
Abstract - The European Parliament and the Council adopted the Directive 2003/10/EC regarding minimum health and safety requirements for workers exposure to risks arising from physical agents (noise). This directive is intended to ensure health protection for each worker, and to create a minimum guaranteed level of protection for all Community work...
Conference Paper
Full-text available
Abstract - The growing importance of noise pollution produced by urban road traffic needs a correct assessment of the acoustic climate of more or less extended built-up areas. According to what is stated in European Noise Directive 2002/49/EC the environmental noise indicators, based on equivalent sound pressure levels, should be measured or prefer...
Presentation
The aim of the project is to verify the applicability of MEMS wireless accelerometers to investigate oscillatory phenomena that can jeopardize the safety of structural elements and how these devices can perform environmental monitoring campaigns of vibration measurements. This to obtain a prototype sensor which data can be compared with those measu...

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Projects

Projects (5)
Archived project
Subsurface void detection using infrared imaging
Archived project
To measure vibrations characterizing large-sized civil engineering structures (i.e. low frequency and amplitude), I designed, built, and tested the novel wireless, MEMS-based accelerometer sensor board. The prototype used radiofrequency communication, frequency modulated conversion (to achieve better measurement resolution), and operated as a stand-alone node within a WSN to perform short term monitoring of laboratory-scale and actual structures. Results showed the sensor board’s capability in measuring sub-Hertz vibrations having amplitude on the order 10-2 m∙s-2 with the same accuracy of wired, high-sensitivity, integrated electronics piezoelectric (IEPE) sensors.