Elsa Henriques
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View article: Using Explainable Artificial Intelligence to Interpret Remaining Useful Life Estimation with Gated Recurrent Unit
Using Explainable Artificial Intelligence to Interpret Remaining Useful Life Estimation with Gated Recurrent Unit Open
In engineering, prognostics can be defined as the estimation of the remaining useful life of a system given current and past health conditions. This field has drawn attention from research, industry, and government as this kind of technolo…
View article: Empirical estimation of metal powder bed fusion technological improvement rate
Empirical estimation of metal powder bed fusion technological improvement rate Open
This study empirically estimates the technological improvement rate (TIR) of metal powder bed fusion (PBF) technology, widely used in aerospace, automotive, and medical industries. PBF's continuous long-term adoption growth is driven by it…
View article: Onshore wind in Portugal: History, supporting policies, economic viability and future perspectives
Onshore wind in Portugal: History, supporting policies, economic viability and future perspectives Open
Onshore wind energy is currently playing a crucial role in Europe's decarbonization efforts. Among other European countries, Portugal is recognized as a successful example of large-scale wind energy implementation thanks to its supportive …
View article: Towards plastics circular economy: sustainability assessment of mono-material design for recycling
Towards plastics circular economy: sustainability assessment of mono-material design for recycling Open
Plastic pollution is a pressing global concern due to its severe environmental impacts. Thus, the adoption of sustainable practices in product design and end-of-life management has become paramount towards a plastic's circular economy. Thi…
View article: Sustainable Value Roadmap for the Plastics Industry
Sustainable Value Roadmap for the Plastics Industry Open
The plastics industry has revolutionized several sectors, from packaging to automotive, enabling companies to develop innovative products and enhance their economic competitiveness. However, the exponential growth of this industry has also…
View article: Economic Viability of Implementing Structural Health Monitoring Systems on the Support Structures of Bottom-Fixed Offshore Wind
Economic Viability of Implementing Structural Health Monitoring Systems on the Support Structures of Bottom-Fixed Offshore Wind Open
Offshore wind (OSW) energy is a renewable source with strong prospects of development that may decisively contribute towards energy independence. Offshore wind is, however, not yet ubiquitously cost competitive, and frequently requires sup…
View article: 1D-DGAN-PHM: A 1-D denoising GAN for Prognostics and Health Management with an application to turbofan
1D-DGAN-PHM: A 1-D denoising GAN for Prognostics and Health Management with an application to turbofan Open
The performance of prognostics is closely related to the quality of condition monitoring signals (e.g., temperature, pressure, or vibration signals), which reveal the degradation of the system of interest. However, typical condition monito…
View article: Relation between prognostics predictor evaluation metrics and local interpretability SHAP values
Relation between prognostics predictor evaluation metrics and local interpretability SHAP values Open
Maintenance decisions in domains such as aeronautics are becoming increasingly dependent on being able to predict the failure of components and systems. When data-driven techniques are used for this prognostic task, they often face headwin…
View article: Classification prognostics approaches in aviation
Classification prognostics approaches in aviation Open
Traditionally, prognostics approaches to predictive maintenance have focused on estimating the remaining useful life of the equipment. However, from an industrial point of view, the goal is often not to predict the residual life but to det…
View article: A self-organizing map and a normalizing multi-layer perceptron approach to baselining in prognostics under dynamic regimes
A self-organizing map and a normalizing multi-layer perceptron approach to baselining in prognostics under dynamic regimes Open
When the influence of changing operational and environmental conditions, such as temperature and external loading, is not factored out from sensor data it can be difficult to observe a clear deterioration path. This can significantly affec…
View article: Prognostics in Aeronautics with Deep Recurrent Neural Networks
Prognostics in Aeronautics with Deep Recurrent Neural Networks Open
Recurrent neural networks (RNNs) such as LSTM and GRU are not new to the field of prognostics. However, the performance of neural networks strongly depends on their architectural structure. In this work, we investigate a hybrid network arc…
View article: Soil Interaction and Grout Behavior for the NREL Reference Monopile Offshore Wind Turbine
Soil Interaction and Grout Behavior for the NREL Reference Monopile Offshore Wind Turbine Open
Monopiles for offshore wind are the most used foundations by farm operators due to their low production costs, when compared to other bottom-fixed or floating foundations. In this research, a monopile foundation for offshore wind power was…
View article: Diversity minimization through part combination – a Portuguese railway infrastructure case study
Diversity minimization through part combination – a Portuguese railway infrastructure case study Open
With increasing market needs for product and service variety, companies struggle to provide diversity in cost-effective ways. Through standardization of components with a low perceived added value, companies can take advantage of economies…
View article: Cross-Cultural Differences in Creative Ideation: A Comparison between Singaporean and Portuguese Students
Cross-Cultural Differences in Creative Ideation: A Comparison between Singaporean and Portuguese Students Open
The purpose of this work is to compare the creative outcome in the educational context of students belonging to two different cultures, namely Singaporean and Portuguese and determine whether they respond differently to the same design bri…
View article: Design and development of the ITER CTS diagnostic
Design and development of the ITER CTS diagnostic Open
The Collective Thomson Scattering (CTS) diagnostic will be a primary diagnostic for measuring the dynamics of the confined fusion born alpha particles in ITER and will be the only diagnostic for alphas below 1.7 MeV [1]. The probe beam of …
View article: Effects of Nintendo Wii® Program in Dual-Task Performance in Older Adults
Effects of Nintendo Wii® Program in Dual-Task Performance in Older Adults Open
A sedentary lifestyle has a strong impact on the older population; so participation in physical activity is important for enhanced physical and mental function, increasing health and well-being. In the elderly, dual- task activities are se…
View article: Remaining useful life estimation in aeronautics: Combining data-driven and Kalman filtering
Remaining useful life estimation in aeronautics: Combining data-driven and Kalman filtering Open
Data-driven prognostics can be described in two sequential steps: a training stage, in which, the data-driven model is constructed based on observations; and a prediction stage, in which, the model is used to compute the end of life and re…
View article: A Case for the Use of Data-driven Methods in Gas Turbine Prognostics
A Case for the Use of Data-driven Methods in Gas Turbine Prognostics Open
The goal of data-driven methods is to remove dependence on classical models of structured expert judgment and draw insights to causal relationships directly from the data. This paper investigates the potential of using data-driven methods,…
View article: Modelling the dynamics of complex early design processes: an agent-based approach
Modelling the dynamics of complex early design processes: an agent-based approach Open
Among the different phases of complex design processes, early design is the most dynamic and unpredictable stage since it involves a great deal of uncertainty, concurrency of activity streams, collaborative design iterations, and distribut…
View article: Life Cycle Engineering and Management – Fostering the Management-orientation of Life Cycle Engineering Activities
Life Cycle Engineering and Management – Fostering the Management-orientation of Life Cycle Engineering Activities Open
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View article: Improved Time-Based Maintenance in Aeronautics with Regressive Support Vector Machines
Improved Time-Based Maintenance in Aeronautics with Regressive Support Vector Machines Open
Baptista, M., Medeiros, I. P. de, Malere, J. P., Prendinger, H., Nascimento Jr., C. L., & Henriques, E. (2016). Improved Time-Based Maintenance in Aeronautics with Regressive Support Vector Machines. Annual Conference of the PHM Society, 8…
View article: Life Cycle Engineering – Taxonomy and State-of-the-Art
Life Cycle Engineering – Taxonomy and State-of-the-Art Open
Engineering activities have to be systematically directed towards sustainability. For this, life cycle engineering (LCE) is a promising approach due to its long-term perspective and consideration of ecological and economic targets. This pa…
View article: Galvanic corrosion of aircraft bonded joints as a result of adhesive microcracks
Galvanic corrosion of aircraft bonded joints as a result of adhesive microcracks Open
This paper studies the root causes of a corrosion failure found in the Airbus A320 CFM56-5b intakes. This failure occurs in a dissimilar materials joint and is strongly related to the adhesive loss of integrity at very low temperatures. Th…
View article: Application of Life Cycle Engineering Approach to Assess the Pertinence of Using Natural Fibers in Composites – The Rocker Case Study
Application of Life Cycle Engineering Approach to Assess the Pertinence of Using Natural Fibers in Composites – The Rocker Case Study Open
Natural fiber reinforced polymer composites have recently received substantial attention due to their potential for replacing conventional fiber reinforced polymer composites, specifically synthetic fiber reinforced ones. Based on a real p…