Timoleon Kipouros

Timoleon Kipouros
University of Cambridge | Cam · Department of Engineering

PhD

About

155
Publications
51,349
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,592
Citations
Introduction
Timoleon Kipouros currently works at the Department of Engineering, University of Cambridge. Timoleon does research in Aerospace Engineering, Mechanical Engineering, and Aeronautical Engineering. Some of their current projects include 'Optimization for Aeronautical applications', and 'Interactive visualisation and Parallel Coordinates for Engineering Design'.
Additional affiliations
October 2021 - present
Cranfield University
Position
  • Senior Lecturer
April 2017 - September 2021
Cranfield University
Position
  • Lecturer
March 2016 - October 2022
University of Cambridge
Position
  • Senior Research Associate
Education
March 2017 - August 2017
Massachusetts Institute of Technology
Field of study
  • Architecture and Systems Engineering
October 2002 - April 2006
University of Cambridge
Field of study
  • Engineering Design
October 1997 - June 2002
University of Patras
Field of study
  • Mechanical and Aeronautical Engineering

Publications

Publications (155)
Article
Full-text available
This paper presents a study of the effects of the durability and level of energy storage technology on energy management strategies and the performance of hybrid electric turboprops. The results highlight the key role of battery energy density on the durability of the battery pack and the viability of the concept of hybrid electric aircraft. Additi...
Conference Paper
Full-text available
This paper introduces a comprehensive framework for multi-fidelity, multidisciplinary optimization of propeller design using visual analytics. The proposed methodology integrates advanced data visualization techniques, surrogate modelling and optimisation methodologies to handle high-dimensional data across various disciplines, including aerodynami...
Conference Paper
Full-text available
This paper presents the application of a Bayesian Network as a tool for propagating the uncertainty between the aircraft-level design and the component-level design. The framework is applied to an example case in UAV design for payload transport. By querying the model, we demonstrate its ability to capture the casual relationships of the design pro...
Article
Full-text available
Chronic Obstructive Pulmonary Disease is a progressive lung disease associated with anxiety, depression, and reduced health-related quality of life. Pulmonary rehabilitation (PR) is a cost-effective and transformative treatment, but 31% of referred patients do not take up their PR appointment. The study aimed to develop user requirements for an int...
Article
Full-text available
This contribution builds on the Design Framework for System-of-Systems Resilience to investigate the potential of a new systems resilience measuring approach inspired by the Frailty Index. To explore this research direction, we provide a brief overview of the evolution of the notion of resilience, offer a characterisation of systems resilience as a...
Article
Full-text available
The global elderly population rises, increasing dementia cases. Built environment impact on dementia health outcomes is known, forming the basis for evidence-based design studies. There's a need for a comprehensive assessment framework due to the complexity of interactions among Architectural Variables (AVs) and Health and Care Outcomes (HCOs). Thi...
Article
Full-text available
This contribution departs from an existing model, the Design Framework for Systems-of-Systems Resilience, to explore systems resilience issues across the health, environmental, and economic domains. The reported research activities include 1) a rapid review to collect a set of systems indicators and 2) a design workshop employing causal loop diagra...
Article
Full-text available
Contemporary engineering design is characterised by products and systems with increasing complexity coupled with tighter requirements and tolerances. This leads to high epistemic uncertainty due to numerous possible configurations and a high number of design parameters. Set-Based Design is a methodology capable of handling these design problems, by...
Conference Paper
Full-text available
A study on the uncertainty quantification and propagation in a multi-fidelity, multi-disciplinary framework, focusing on aerodynamics, aeroacoustics, and aeroelasticity in propeller blade design is presented. Employing the Lattice Boltzmann Method (LBM) for high-fidelity simulations and the Lifting Line Free Vortex Wake (LLFVW) and Finite Element A...
Conference Paper
When objectives, constraints, boundary conditions, and loading conditions are clear, topology optimization is useful to generate the optimal shape for an individual component. However, in systems consisting of multiple components, component interfaces and their locations may have a significant influence on the component, and, thus, the global syste...
Conference Paper
Full-text available
Stakeholder management often is a complex process in large, multidisciplinary projects with systemic implications. In this contribution, we adopt a systems engineering approach to stakeholder management in a large-scale landscape regeneration effort in the UK, namely the Cambridge Centre for Landscape Regeneration (CLR). Through stakeholder mapping...
Article
Full-text available
Introduction Transition following discharge from mental health hospital is high risk in terms of relapse, readmission and suicide. Discharge planning supports transition and reduces risk. It is a complex activity involving interacting systemic elements. The codesigning a systemic discharge intervention for inpatient mental health settings (MINDS) s...
Article
Full-text available
Decisions made in the concept generation phase have a significant effect on the product. While product- related risks typically can be considered in the early stages of design, risks such as supply chain and manufacturing methods are rarely easy to account for in early phases. This is because the currently available methods require mature data, whi...
Article
Full-text available
The objective of green, carbon-neutral flights is propelling the innovation of newer propulsion systems. With this increased development of an interdisciplinary form of propulsion for aircraft, the integration burdens and efforts intensify. In literature, it is estimated that it takes 10-15 years to design and develop an aircraft. The expected date...
Article
Full-text available
The complexity of hybrid-electric aircraft propulsion systems is also characterized by the greater number of degrees of freedom of the energy management system, whose objective is to split the required power to fly the aircraft to the different available powertrains (i.e., gas turbines, electric motors, fuel cells, etc.). Typically, a single design...
Article
Full-text available
The upcoming stringent environmental aircraft regulations and the environmental, social and governance (ESG) framework targeting net zero emissions has forced aircraft manufacturers to seek innovative feasible technical solutions. Often, there is the need to consider entirely radical solutions, such as hybrid-electric aircraft, which are not fully...
Article
Targets for climate change are not static. They are multiplying and moving toward us. The recently established World Health Organisation Alliance for Transformative Action on Climate and Health records the growing number of countries who have made climate commitments ranging from Argentina to Zambia.¹ The National Health Service (NHS) in England il...
Article
Full-text available
The main goal of the research project FUTPRINT50 is the acceleration of the introduction of a hybrid-electric regional aircraft. One essential part of this project is to develop a roadmap which couples the technological development with its associated research infrastructure and regulatory aspects. This aims at maximizing the likelihood of a succes...
Conference Paper
Product architectures are often designed as evolutions or modifications of existing product platforms by adding new functionalities. However, there is still a limited ability to simultaneously modify the functions and the physical elements of a system (and the corresponding links between them). These relationships, which are usually static, limit t...
Conference Paper
Full-text available
It is expected that aero engine businesses will develop radically new types of propulsion solutions to meet the new sustainability-driven targets. Consequently, to meet new conditions not previously encountered, both in design and in production, the structural components of the engines will also have to be radically different. Implications of this...
Article
The tip clearance size has historically been considered to be the main factor affecting stability range in axial fan and compressors. This paper reveals that the stall characteristics are defined by the axial momentum flux of the tip leakage flow and that tip clearance is primarily a strong driver for this metric. A bespoke methodology for carefull...
Conference Paper
Full-text available
This work presents a novel methodology for performing design analysis and optimisation on scenarios involving computationally expensive numerical simulations and high-dimensional design spaces, often encountered in industry. The capabilities and applicability of the method are demonstrated through two application test cases in the field of gas turb...
Article
View Video Presentation: https://doi.org/10.2514/6.2022-3929.vid Over the past years, robust optimisations have become very popular and necessary. The aim of this type of optimisation is to consider the sensitivity of the output results to small variations in the operating conditions and manufacturing tolerances. To study such sensitivities, an acc...
Article
Full-text available
Characterising a socio-technical system by its underlying structure is often achieved by cluster analyses and bears potentials for engineering design management. Yet, highly connected systems lack clarity when systematically searching for structures. At two stages in a clustering procedure (pre-processing and post-processing) modelled and external...
Article
Full-text available
The energy management strategy of a hybrid-electric aircraft is coupled with the design of the propulsion system itself. A new design space exploration methodology based on Set-Based Design is introduced to analyse the effects of different strategies on the fuel consumption, NOx and take-off mass. Probabilities are used to evaluate and discard area...
Conference Paper
Full-text available
Current research in hybrid-electric aircraft propulsion has outlined the increased complexity in design when compared with traditional propulsion. However, current design methodologies rely on aircraft-level analysis and do not include the consideration of the impact of new technologies and their uncertainty. This can be a key factor for the develo...
Article
Full-text available
Electric and Hybrid-Electric Aircraft (HEA) propulsion system designs shall bring challenges at aircraft and systems level, mainly in propulsion, electric and thermal management systems (TMS). The electrification of the propulsion system relies on large and high-power electrical equipment (e.g., electrical motors, converters, power electronics, bat...
Article
Full-text available
We present a refinement of the Immersive Parallel Coordinates Plots (IPCP) system for Virtual Reality (VR). The evolved system provides data-science analytics built around a well-known method for visualization of multidimensional datasets in VR. The data-science analytics enhancements consist of importance analysis and a number of clustering algori...
Article
Full-text available
The main purpose of this study was to combine the currently separate objectives of aerodynamic performance and manufacturing efficiency, then find an optimal point of operation for both objectives. An additional goal of the study was to explore the effects of changes in design features, the position of the spars, and analyse how the changes influen...
Article
Nanoparticle drug delivery better targets neoplastic lesions than free drugs and thus has emerged as safer form of cancer therapy. Nanoparticle design variables are important determinants of efficacy as they influence the drug biodistribution and pharmacokinetics. Previously, we determined optimal designs through mechanistic modeling and optimizati...
Article
Full-text available
Aeroengine manufacturers need to better include assessment of risk and cost for realising the novel products needed to meet the ambitions sustainability driven targets for air transport. Radical technologies are needed that simultaneously require critical manufacturing processes to be assessed already in conceptual design. In this paper, a multi-do...
Article
Computational engineering design methods and tools are common practices in the modern industry. Such approaches are integral in enabling designers to efficiently explore large and complex design spaces. However, they also tend to dramatically increase the number of candidate solutions that decision makers must correctly interpret. Because all candi...
Conference Paper
Machine learning models are becoming an increasingly popular way to exploit data from fluid dynamics simulations. This project investigates how autoencoders and output consolidation can be used to increase the accuracy of machine learning models, by injecting knowledge of the full flow field in the predictions of Quantities of Interest (QoI) used i...
Article
Uncertainty quantification (UQ) within topology optimization (TO) is a growing trend, with designers recognizing that deterministic analysis does not reflect the natural variabilities found in real-world structural performance. Thus far the majority of works have dealt with uncertain loading and material properties; however, minimal research has co...
Article
Full-text available
Multi-objective topology optimisation problems are often tackled by compromising the cost functions according to the designer’s knowledge. Such an approach however has clear limitations and usually requires information which especially at the preliminary design stage could be unavailable. This paper proposes an alternative multi-objective approach...
Article
Full-text available
Electric and Hybrid-Electric Aircraft (HEA) incorporate new systems, which demand an integration level higher than classical propulsion architectures systems do. High power electrical motors, converters, batteries or fuel cells, and distributed propulsion, all introduce new kinds of heat sources and dynamics that have to be accounted for and regula...
Conference Paper
Increasing penetrations of small scale electricity generation and storage technologies are making an important contribution to the decentralisation and decarbonisation of power system control and operation. Although not currently realised, coordination of local distributed energy resources (DERs) and a greater degree of demand flexibility through d...
Article
Full-text available
Supporting designers is one of the main motivations for design research. However, there is an ongoing debate about the ability of design research to transfer its results, which are often provided in form of design methods, into practice. This article takes the position that the transfer of design methods alone is not an appropriate indicator for as...
Conference Paper
Full-text available
This paper considers how a novel digitally enabled mechanism to aggregate distributed energy resources (DERs) can support significant challenges to decarbonise the energy system, support the energy market in terms of demand and energy cost, and organise a large number of distributed assets. In this study, we present the potential for accelerating t...
Conference Paper
Uncertainty quantification (UQ) within topology optimization (TO) is a growing trend with designers recognizing that deterministic analysis does not reflect the natural variabilities found in real world structural analysis. Thus far the majority of works have dealt with uncertain loading and material properties however minimal research has consider...
Conference Paper
Full-text available
Computational engineering design methods and tools are common practice in modern industry. Such approaches are integral in enabling designers to efficiently explore larger and more complex design spaces. However, at the same time, computational engineering design methods tend to dramatically increase the number of candidate solutions that decision-...
Poster
Full-text available
We are aiming at leveraging the immersive tech i.e. Virtual Reality (VR), to aid the aerospace turbomachinery design processes. One of the key issues related to the use of such novel interfaces is to design the system in a way that allows the user to effectively and effortlessly interact within the environment. To achieve this, we studied different...
Article
Recent research on turbomachinery design and analysis for supercritical Carbon Dioxide (sCO2) power cycles has relied on Computational Fluid Dynamics. This has produced a large number of works whose approach is mostly case-specific, rather than of general application to sCO2 turbomachinery design. As opposed to such approach, this work explores the...
Article
Industrial aerodynamic design applications require multiobjective optimization tools able to provide design feedback to the engineers. This is true especially when optimization studies are carried out during the conceptual design stage. The need for fast optimization methods has led to the development of multifidelity methods in a surrogate based o...
Poster
Full-text available
Recent technological breakthroughs have ushered in a wealth of advancements in virtual reality (VR). This term is commonly used interchangeably with headsets (HMDs) or goggles that transport users to a built-for-purpose immersive 3D virtual environment. By combining this technology with the advances in visual analytics, a new research field titled...
Article
Full-text available
This paper focuses on novel interdisciplinary design methodologies between architecture and aerospace engineering in support of drastic required changes for the construction of genuinely resilient and sustainable buildings. Current design and construction methods are rarely truly interdisciplinary; driven by successive development stages as opposed...
Article
Full-text available
Topology optimization has proven to be viable for use in the preliminary phases of real world design problems. Ultimately, the restricting factor is the computational expense since a multitude of designs need to be considered. This is especially imperative in such fields as aerospace, automotive and biomedical, where the problems involve multiple p...
Conference Paper
Recent research on turbomachinery design and analysis for supercritical Carbon Dioxide (sCO2) power cycles has relied on Computational Fluid Dynamics. This has produced a large number of works whose approach is mostly case-specific, rather than of general application to sCO2 turbomachinery design. As opposed to such approach, this work explores the...
Article
Full-text available
Optimisation is aimed at enhancing aircraft design by identifying the most promising wing planforms at the early stage while discarding the least performing ones. Multiple disciplines must be taken into account when assessing new wing planforms, and a model-based framework is proposed as a way to include mass estimation and longitudinal stability a...
Poster
Full-text available
Parallel Coordinates Plots (PCP) are a widely used approach to interactively visualize and analyze multidimensional scientific data in a 2D environment. In this paper, we explore the use of Parallel Coordinates in an immersive Virtual Reality (VR) 3D visualization environment as a means to support the decision-making process in engineering design p...
Conference Paper
Parallel Coordinates Plots (PCP) are a widely used approach to interactively visualize and analyze multidimensional scientific data in a 2D environment. In this paper, we explore the use of Parallel Coordinates in an immersive Virtual Reality (VR) 3D visualization environment as a means to support the decision-making process in engineering design p...
Article
Full-text available
In this work, an interactive optimisation framework—a combination of a low fidelity flow solver, Athena Vortex Lattice (AVL), and an interactive Multi-Objective Particle Swarm Optimisation (MOPSO)—is proposed for aerodynamic shape design optimisation of any aerial vehicle platform. This paper demonstrates the benefits of interactive optimisation—re...
Article
Full-text available
This article presents an optimisation framework that uses stochastic multi-objective optimisation, combined with an Artificial Neural Network (ANN), and describes its application to the aerodynamic design of aircraft shapes. The framework uses the Multi-Objective Particle Swarm Optimisation (MOPSO) algorithm and the obtained results confirm that th...
Article
Full-text available
During the early stages of any system design, a thorough exploration of the design space can prove to be challenging and computationally expensive. The challenges are further exacerbated when dealing with complex systems, such as an aircraft, due to the high dimensionality of their design space. Arising from the Toyota Product Development System, s...
Chapter
Full-text available
Multi-objective optimization has become an invaluable tool in engineering design. One class of solutions to the multi-objective optimization problem is known as the Pareto frontier. The Pareto frontier is made up of a group of solutions known as Pareto optimal solutions. These solutions are optimal in the sense that any improvement in one design ob...
Article
Full-text available
In this work, we investigate the computational design of a typical S-Duct that is found in the literature. We model the design problem as a shape optimization study. The design parameters describe the 3D geometrical changes to the shape of the S-Duct and we assess the improvements to the aerodynamic behavior by considering two objective functions:...
Article
Full-text available
The transition to a secure low-carbon system is raising a set of uncertainties when planning the path to a reliable decarbonised supply. The electricity sector is committing large investments in the transmission and distribution sector upon 2050 in order to ensure grid resilience. The cost and limited flexibility of traditional approaches to 11 kV...
Article
This paper explores the necessary and appropriate level of detail that is required to describe the structural geometry of aircraft wings accurately enough to predict the mass of the main load-carrying wing structure to an acceptable level of accuracy. Four different models of increasing structural fidelity are used to describe the wingbox structure...
Article
This article presents an optimisation framework for the compliance minimisation of structures subjected to design-dependent pressure loads. A finite element solver coupled to a Lattice Boltzmann method is employed, such that the effect of the fluid-structure interactions on the optimised design can be considered. It is noted that the main computati...
Article
This article presents an optimisation framework for the compliance minimisation of structures subjected to design-dependent pressure loads. A finite element solver coupled to a Lattice Boltzmann method is employed, such that the effect of the fluid-structure interactions on the optimised design can be considered. It is noted that the main computati...
Article
Full-text available
To date the design of structures using topology optimization methods has mainly focused on single-objective problems. Since real-world design problems typically involve several different objectives, most of which counteract each other, it is desirable to present the designer with a set of Pareto optimal solutions that capture the trade-off between...