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Browsing by Author "Montalvao, Diogo"
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Chapter 5 - Introduction to Sensors and Signal Processing
Montalvao, Diogo (CRC Press, 2015-12)This chapter presents the fundamentals on sensors and signal processing, with emphasizes on Mechatronics and applications. Sensors are used to measure signals that present changes in the time domain, e.g. waveforms or ... -
Comparação de limas ProFile GT Série X com ProFile GT através da caracterização por DRX e de um Estudo por Elementos Finitos
Alcada, Francisca S.; Montalvao, Diogo (2012-03) -
Design and Assembly of an Ultrasonic Fatigue Testing Machine
Freitas, Manuel; Anes, V.; Montalvao, Diogo; Reis, Luís; Ribeiro, A. M. R. (2011-04)The lifetime approach in fatigue design based on S_N curves establish an infinite life when the cyclic stress applied is below than the endurance limit. Results in this field revealed fatigue failures beyond 10e7 cycles, ... -
Design and instrumentation of an ultrasonic fatigue testing machine
Anes, V.; Montalvao, Diogo; Ribeiro, A. M. R.; Freitas, Manuel; Fonte, Manuel (2011-06) -
Economic Analysis of Domestic Combined Heat and Power System in the UK
Sutharssan, Thamo; Montalvao, Diogo; Chen, Yong; Wang, Wen-Chung; Pisac, Claudia (2016-01-21)A combined heat and power (CHP) system is an efficient and clean way to generate power (electricity). Heat produced by the CHP system can be used for water and space heating. The CHP system which uses hydrogen as fuel ... -
Effect of Alternating Magnetic Field on the Fatigue Behaviour of EN8 Steel and 2014-T6 Aluminium Alloy
Akram, Sufyan; Babutskyi, Anatolii; Chrysanthou, Andreas; Montalvao, Diogo; Pizurova, Nadezda (2019-09-04)The application of an alternating magnetic field (0.54 T) was observed to lead to an improvement in the fatigue endurance and an increase in Vickers microhardness and tensile strength of both EN8 steel and AA2014-T6 alloy. ... -
Elliptical Method for Damage Identification in Carbon Fibre Reinforced Polymer Laminates
David-West, Opukuro; Amafabia, Daerefa-a; Montalvao, Diogo; Haritos, George (2019-09-29)Oftentimes, researchers in the area of vibration-based Structural Health Monitoring (SHM) and Damage Detection focused their attention on the global properties of structures, which are the modal frequencies and modal damping ... -
A Generalised Multiple-Mass Based Method for the Determination of the Live Mass of a Force Transducer
Montalvao, Diogo; Baker, Thomas; Ihracska, Balazs; Aulaqi, Muhammad (2017-01-15)Many applications in Experimental Modal Analysis (EMA) require that the sensors’ masses are known. This is because the added mass from sensors will affect the structural mode shapes, and in particular its natural frequencies. ... -
Harmonica: Stepped-Sine Spectrum Analyser for Transfer Function Measurement and Non-Linear Experimental Assessment
Montalvao, Diogo; Fontul, M. (2006-07) -
Hysteretic Damping as an Energy Parameter in Gigacycle Fatigue
Ribeiro, A. M. R.; Montalvao, Diogo; Azinheira, J.; Freitas, Manuel; Reis, Luís; Fontul, M. (DVM, 2011)The mechanical behaviour of materials subjected to dynamic loading is now a classical subject but is still a big challenge. The fatigue limit of the materials, defined as the maximum dynamic load amplitude level for which ... -
Instumentation of Ultrasonic High-Frequency Machine to Estimate Applied Stress in Middle Section of Specimen
Lage, Yoann; Freitas, Manuel; Reis, Luís; Ribeiro, A. M. R.; Montalvao, Diogo (2012-07)The objective of this paper is to describe the instrumentation of a new developed ultrasonic fatigue testing machine at 20 kHz working frequency and compare the possible solutions to estimate the stress applied in the ... -
Numeric Comparison of the Static Mechanical Behavior between ProFile GT and ProFile GT Series X Rotary Nickel-Titanium Files
Montalvao, Diogo; Alcada, Francisca S. (2011-08)Introduction: This article aims to evaluate how different superelastic nickel-titanium (NiTi) alloys determine the static mechanical performance of endodontic files during bending and torsion. Methods: Two NiTi rotary ... -
A Numerical-Experimental Method for the Damage Location in Composite Plates
Montalvao, Diogo; Ribeiro, A. M. R.; Duarte-Silva, J. A. B. (Civil-Comp Press, 2010-09) -
On reducing uncertainty on the Elliptical Plane modal identification method
David-West, Opukuro; Montalvao, Diogo; Haritos, George; Amafabia, Daerefa-a; Dupac, Mihai (2018-09-11)The Elliptical Plane has been recently introduced as a modal identification method that uses an alternative plot of the receptance. The method uses the dissipated energy per cycle of vibration as a starting point. For ... -
On the use of vibration parameters for the estimation of damage in laminated composite plates
Montalvao, Diogo; Ribeiro, A. M. R.; Duarte-Silva, J. A. B. (2010-06) -
On the use of vibration parameters for the estimation of damage in laminated composite plates
Montalvao, Diogo; Duarte-Silva, J. A. B.; Ribeiro, A. M. R. (2010-01-01)The dynamic response of a structure depends on the system's particular characteristics, namely its mass, stiffness and damping properties. Vibration-based damage detection techniques assume that damage will induce a local ... -
A Review of Computational Fluid Dynamics Simulations on PEFC Performance.
Chen, Yong; Enearu, Louise; Montalvao, Diogo; Sutharssan, Thamo (2016-12-10)Among the number of fuel cells in existence, the proton exchange fuel cell (PEFC) has been favoured because of its numerous applications. These applications range from small power generation in cell phones, to stationary ... -
A Review of Structural Health Monitoring Techniques as Applied to Composite Structures
David-West, Opukuro; Amafabia, Daerefa-a; Haritos, George; Montalvao, Diogo (2017-10-01)Structural Health Monitoring (SHM) is the process of collecting, interpreting, and analysing data from structures in order to determine its health status and the remaining life span. Composite materials have been extensively ... -
A review of vibration-based structural health monitoring with special emphasis on composite materials
Montalvao, Diogo; Maia, N. M. M.; Ribeiro, A. M. R. (2006-07-01)Structural health monitoring and damage detection techniques are tools of great importance in the off-shore, civil, mechanical and aeronautical engineering communities, both for safety reasons and because of the economic ... -
A review on prognostics and health monitoring of proton exchange membrane fuel cell
Sutharssan, Thamo; Montalvao, Diogo; Chen, Yong; Wang, Wen Chung; Pisac, Claudia; Elemara, Hakim (2017-08-31)Fuel cell technology can be traced back to 1839 when British scientist Sir William Grove discovered that it was possible to generate electricity by the reaction between hydrogen and oxygen gases. However, fuel cell still ...