D. Di Maio
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View article: An Experimental Investigation of Fatigue Damage Growth in Composites Materials Using the Vibration Response Phase Decay
An Experimental Investigation of Fatigue Damage Growth in Composites Materials Using the Vibration Response Phase Decay Open
The increasing use of polymer composites in the aerospace and wind turbine sectors demands faster and more cost-effective methods and standards for detecting material damage. This investigation introduces a novel characteristic parameter f…
View article: A novel analysis method for calculating nonlinear Frequency Response Functions.
A novel analysis method for calculating nonlinear Frequency Response Functions. Open
This research presents a novel analysis method for calculating nonlinear Frequency Response Functions from a nonlinear frequency response surface (NFRS). The research aims to provide engineers with a user-friendly technique to evaluate the…
View article: An investigation of fatigue damage growth in composites materials using the vibration response phase decay
An investigation of fatigue damage growth in composites materials using the vibration response phase decay Open
The increasing use of polymer composites in industry asks for the creation of better, faster and cost-effective methods to detect the damage state of such materials. This work presents the investigation of the phase decay , $ΔΦ$, as a new …
View article: A novel analysis method for calculating nonlinear Frequency Response Functions
A novel analysis method for calculating nonlinear Frequency Response Functions Open
The Frequency Response Functions (FRFs) are the most widely used functions to characterise the dynamic behaviour of structures. The natural frequencies and damping behaviour can be easily and quickly detected from a Bode diagram. The modal…
View article: Tunable Aeroelasticity With Self-Tunable Composite Materials
Tunable Aeroelasticity With Self-Tunable Composite Materials Open
This paper reports the dynamic performance of novel aerospace structures with embedded multiphase materials with tunable stiffness and damping parameters. The proposed structures embedded multiphase materials exploit the thermal loads gene…
View article: The influence of vehicle dynamics on the time-dependent resonances of a bridge
The influence of vehicle dynamics on the time-dependent resonances of a bridge Open
In bridge structural health monitoring, the response of the bridge while the vehicle is on the bridge, is called a vehicle-bridge interaction (VBI) response. If the vehicle and the bridge are dynamically coupled, the VBI response depends o…
View article: Non-stationary Analysis of Vehicle-Bridge Interaction for Structural Health Monitoring of a Railway Bridge
Non-stationary Analysis of Vehicle-Bridge Interaction for Structural Health Monitoring of a Railway Bridge Open
Structural Health Monitoring for bridges is increasingly used in the asset management of bridges.The dynamic properties are key elements in the structural integrity assessment and the identification of damage.Natural frequencies can provid…
View article: Railway bridge damage detection based on extraction of instantaneous frequency by Wavelet Synchrosqueezed Transform
Railway bridge damage detection based on extraction of instantaneous frequency by Wavelet Synchrosqueezed Transform Open
In bridge structural health monitoring, typically the dynamic response of the system is used to assess the health condition of the bridge. However, the dynamic interaction between a bridge and a passing vehicle imposes non-stationarity on …
View article: Investigation of fatigue damage growth and self-heating behaviour of cross-ply laminates using simulation-driven dynamic test
Investigation of fatigue damage growth and self-heating behaviour of cross-ply laminates using simulation-driven dynamic test Open
Structural integrity of aerospace assets is paramount for both the safety and economy of aviation industry. The introduction of composites into the design of aero-structures generated several economic benefits but also led to several chall…
View article: Highly Sensitive Nonlinear Identification to Track Early Fatigue Signs in Flexible Structures
Highly Sensitive Nonlinear Identification to Track Early Fatigue Signs in Flexible Structures Open
This study describes a physics-based and data-driven nonlinear system identification (NSI) approach for detecting early fatigue damage due to vibratory loads. The approach also allows for tracking the evolution of damage in real-time. Nonl…
View article: Extracting the time‐dependent resonances of a vehicle–bridge interacting system by wavelet synchrosqueezed transform
Extracting the time‐dependent resonances of a vehicle–bridge interacting system by wavelet synchrosqueezed transform Open
The dynamic response of a vehicle–bridge interaction (VBI) system is a noisy, nonstationary, and multicomponent response with closely spaced spectral components. Considering the ultimate goal as utilizing the VBI system instantaneous frequ…
View article: Diagnostics Based on Continuous Scanning LDV Measurements and RASTAR Analysis Method
Diagnostics Based on Continuous Scanning LDV Measurements and RASTAR Analysis Method Open
This paper presents a technique for rapid diagnostics of structural integrity that exploits spectral sidebands measured by the continuous scanning LDV (CSLDV) measurement method. Structural integrity can be monitored by Operational Deflect…
View article: Vehicle Bridge Interaction – Extracting the dynamic characteristics of the non-stationary train passing phase
Vehicle Bridge Interaction – Extracting the dynamic characteristics of the non-stationary train passing phase Open
Monitoring of bridge has received a significant amount of attention over the past years, as the condition of these infrastructure elements is crucial to guarantee uninterrupted traffic of people and goods between regions. Most monitoring s…
View article: Viability of Image Compression in Vibrothermography
Viability of Image Compression in Vibrothermography Open
This research focuses on the verification of the viability of image compression in infrared thermography in order to address the problem of data storage. Specifically, images from vibrothermographic tests were utilized due to their special…
View article: Health monitoring of bolted joints using modal-based vibrothermography
Health monitoring of bolted joints using modal-based vibrothermography Open
This article presents a novel modal-based vibrothermographic approach for health monitoring of loosening bolted joints in coupled structures. In this article, the theoretical background supporting this proposed approach is firstly presente…
View article: Transformer hot spot temperature prediction based on basic operator information
Transformer hot spot temperature prediction based on basic operator information Open
A power transformer is an important component in power trains and electrical distribution networks. Predicting its life time is desirable, especially, if a zero downtime policy is applied. However, end customers often have to deal with a l…
View article: Calculating loads and life-time reduction of wind turbine gearbox and generator bearings due to shaft misalignment
Calculating loads and life-time reduction of wind turbine gearbox and generator bearings due to shaft misalignment Open
During the last two decades, wind turbine industries have faced high failure rates, downtimes and costly repairs. Gearbox and generator have contributed to this, especially, because their high speed shaft bearings have often failed. In thi…
View article: Structural Dynamic Performance of Additive and Conventional Manufactured Aerospace Metallic Alloys
Structural Dynamic Performance of Additive and Conventional Manufactured Aerospace Metallic Alloys Open
The structural dynamic behavior of 3D-printed and conventional aluminum alloys are studied experimentally. Heat treated Scalmalloy and Al 7075 T-6 beam-like structures are fabricated using additive and extrusion manufacturing, respectively…
View article: Modal-based vibrothermography using feature extraction with application to composite materials
Modal-based vibrothermography using feature extraction with application to composite materials Open
This research focuses on the development of a damage detection algorithm based on modal testing, vibrothermography, and feature extraction. The theoretical development of mathematical models is presented to illustrate the principles suppor…
View article: Calculating wind turbine component loads for improved life prediction
Calculating wind turbine component loads for improved life prediction Open
Wind turbines life time is commonly predicted based on statistical methods. However, the success of statistics-based maintenance depends on the amount of variation in the system design, usage and load. Life time prediction based on physica…
View article: Utilizing Force-State Mapping for Detecting Fatigue Damage Precursors in Aerospace Applications
Utilizing Force-State Mapping for Detecting Fatigue Damage Precursors in Aerospace Applications Open
The Force-State-Mapping (FSM) method is utilized to identify and monitor precursors to fatigue damage in aerospace alloy structures exposed to vibratory loads. The method is created originally to detect nonlinearity in a dynamical system v…
View article: Diagnostics based on continuous scanning LDV methods: numerical study
Diagnostics based on continuous scanning LDV methods: numerical study Open
This paper presents a research work on diagnostics using continuous scanning laser methods. Structural Health Monitoring based on laser vibrometry can exploit the ability of a scanning laser to measure vibration responses remotely both reg…
View article: Connecting nonlinearities: Damage precursors detection and control methodology
Connecting nonlinearities: Damage precursors detection and control methodology Open
Fatigue damage precursors identification and control procedure is developed for nonlinear aero-structures and dynamic systems exposed to realistic vibratory conditions. The identification is achieved by connecting nonlinearities between ma…
View article: Industrial-Graded Epoxy Nanocomposites with Mechanically Dispersed Multi-Walled Carbon Nanotubes: Static and Damping Properties
Industrial-Graded Epoxy Nanocomposites with Mechanically Dispersed Multi-Walled Carbon Nanotubes: Static and Damping Properties Open
The majority of currently published dispersion protocols of carbon nanotubes rely on techniques that are not scalable to an industrial level. This work shows how to obtain polymer nanocomposites with good mechanical characteristics using m…