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An analytical framework for the best–worst method

Wu, W. (author), Liu, Xinwang (author), Zhou, Ligang (author), Qin, Jindong (author), Rezaei, J. (author)

Since the development of the best–worst method (BWM) in 2015, it has become a popular research focus in multi-criteria decision-making. The original optimization problem of the BWM is a nonlinear min–max model that can lead to multiple optimal solutions, while the linear model of the BWM produces a unique solution. The two models need to be...

journal article 2024

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Analytical relationships for 2D Re-entrant auxetic metamaterials: An application to 3D printing flexible implants

Hedayati, R. (author), Yousefi, Armin (author), Dezaki, Mohammadreza Lalegani (author), Bodaghi, Mahdi (author)

Both 2D and 3D re-entrant designs are among the well-known prevalent auxetic structures exhibiting negative Poisson's ratio. The present study introduces novel analytical relationships for 2D re-entrant hexagonal honeycombs for both negative and positive ranges of the cell interior angle θ (θ<0 showing a negative Poisson's ratio). The...

journal article 2023

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Semi-analytical solution for the 3D response of a tunnel embedded in an elastic half-space subject to seismic waves

Zhao, M. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author), van Dalen, K.N. (author)

This paper presents a semi-analytical solution for the 3D problem of a cylindrical tunnel embedded in an elastic half-space subject to plane harmonic compressional and shear waves. Both the tunnel and soil are modelled as an elastic continuum. Conformal mapping is employed to transform the original physical domain with boundary surfaces of two...

journal article 2023

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Nonlinear Fluid-Structure Interaction in Large-Scale Offshore Floating Photovoltaics

Xu, P. (author)

Efficient and affordable solar energy is essential for reducing greenhouse gas emissions and achieving climate neutrality. Large-scale offshore floating photovoltaics (LOFPV) provide creative opportunities for clean and cost-effective renewable energy production close to populated areas. They are composed of solar modules, a membrane platform,...

doctoral thesis 2022

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Sandwich structures with repairable cores based on truncated cube cells

Hedayati, R. (author), Yousefi, Armin (author), Bodaghi, Mahdi (author)

With dramatic increase in 3D printing applications in industry, sandwich panels with 3D printed cores have gained a lot of attention recently. In harmony with global movement towards sustainability and low-carbon emission industries, sandwich panels with easy-to-repair and cost-effective cores would be very attractive structures. In this...

journal article 2022

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An analytical multiphase flow model for parallel plate electrolyzers

Rajora, A. (author), Haverkort, J.W. (author)

Membraneless parallel-plate electrolyzers use electrolyte flow to avoid product crossover. Using a mixture model neglecting inertia, and assuming an exponential gas fraction profile, we derive approximate analytical expressions for the velocity profile and pressure drop for thin plumes. We verify these expressions using numerical solutions...

journal article 2022

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Mechanical responses of a fiberglass flexible pipe subject to tension & internal pressure

Fang, P. (author), Xu, Yuxin (author), Gao, Yifan (author), Ali, Liaqat (author), Bai, Yong (author)

Composite structures, such as the fiberglass reinforced structure studied in this paper, have been normally treated in previous research as homogeneous anisotropic laminated plates regarding the investigation of their mechanical properties. Throughout this paper, this specific structure is considered in a different way in which the fiberglass...

journal article 2022

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Prediction of mechanical solutions for a laminated LCEs system fusing an analytical model and neural networks

Wang, Jue (author), Yuan, Weiyi (author), Li, Z. (author), Zhu, Yingcan (author), Santos, Thebano (author), Fan, J. (author)

This paper presents a convenient and efficient method to predict the mechanical solutions of a laminated Liquid Crystal Elastomers (LCEs) system subjected to combined thermo-mechanical load, based on a back propagation (BP) neural network which is trained by machine learning from a database established by analytical solutions. Firstly, the...

journal article 2022

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Numerical analysis and discussion on the hot-spot stress concept applied to welded tubular KT joints

Vieira Ávila, Bianca (author), Correia, J.A.F.O. (author), Carvalho, Hermes (author), Fantuzzi, Nicholas (author), De Jesus, Abílio (author), Berto, Filippo (author)

Nominal stresses have been used for a long time for the assessment of fatigue resistance of welded joints, however, this approach has strong limitations since the definition of the nominal stress may be subjective for complex welded details and/or complex loading. On the other hand, the hot-spot stress approach has been proposed to overcome...

journal article 2022

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Global Grasp Planning for On-Orbit Robotic Manipulation: Design of an analytic grasp planning engine for autonomous capture of novel objects

Vilella Ramisa, Marti (author)

To manage the increasing amount of satellite traffic in orbit and renewed operational ambitions, it is crucial to advance the capabilities of space robotic systems to enable complex manipulability tasks. These abilities will provide the necessary components to perform satellite de-orbiting, servicing of important assets, and assistance in on...

master thesis 2021

document

Buckling of Isotropic and Composite Cylindrical Shells with Circular Cutouts

Schiller, Arne (author)

Predicting the critical buckling load of cylindrical shells with circular cutouts subjected to uniform axial compression is an important part of the structural design in the aerospace industry as buckling significantly reduces the load-carrying capability of the structure. A cutout constitutes a major disruption in the shell geometry, and...

master thesis 2021

document

Design analysis for thermoforming of thermoplastic composites: Prediction and machine learning-based optimization

Nardi, D. (author), Sinke, J. (author)

The correct prediction of a composite parts’ final performance is of paramount importance during the initial design phase of the manufacturing process. To this end the correct evaluation of the most effective process parameters and their influence on the parts performance is key for the success of the manufacturing process. Our aim with this...

journal article 2021

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Analytical solutions for excess pore water pressures generated by TBM tunnelling in a semi-confined aquifer

Xu, Tao (author), Bezuijen, Adam (author), Broere, W. (author)

Tunnel-boring machine (TBM) tunnelling through an aquifer will generate excess pore water pressures in the soil around the tunnel face. Accurately predicting the magnitude of the excess pore water pressures is significant because it directly determines the effective face support pressure. In this study, an analytical solution for transient...

journal article 2021

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Development of an analytical model for predicting the wet collapse pressure of curved flexible risers

Li, X. (author), Jiang, X. (author), Hopman, J.J. (author)

Flexible risers are designed with strong anti-collapse capacities which enable them to operate in deep-water reservoirs. However, this anti-collapse capacity is susceptible to the pipe curvature in the flooded annulus condition. For the curved riser sections within the touch-down zone, significant reduction of collapse capacity can occur once...

journal article 2021

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Assessment of Existing Slender Masonry Walls beyond the Scope of the EN 1996 Norm: Numerically Based Analytical Solution to determine the Capacity under combined Vertical and Lateral Loading

Peponis, Stathis (author)

In the last decade, maintenance and adaptive reuse, of the existing building stock, have gained ground in the construction sector. For the adaptive reuse of a building, it is required to analyze, meticulously, the existing structure. Unreinforced masonry structures are indicative of the Dutch built environment. For the assessment of their...

master thesis 2020

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Well productivity evaluation in deformable single-fracture media

Kadeethum, T. (author), Salimzadeh, Saeed (author), Nick, H.M. (author)

Evaluations and interpretations of reservoir productivity are frequent in geothermal, groundwater and hydrocarbon research and applications. In this study, we consider the closure of fractures around production wells due to compaction that can affect the productivity value, i.e. the ability of subsurface formations for transporting the desired...

journal article 2020

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Analytical Solution for Low-Thrust Transfer Orbits using Bang-Bang Control without Gravity Losses

Ionescu, Livia (author)

This thesis research has focused on developing an analytical solution for low-thrust transfer orbits. Low-thrust propulsion is an attractive option for space manoeuvres and transfers, since it provides a large specific impulse and hence efficient use of propellant. Thus, the propellant mass can be decreased, which brings advantages such as...

master thesis 2019

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Semi-analytical solution for the dynamic response of a cylindrical structure embedded in a homogeneous half-space

Zhao, M. (author), van Dalen, K.N. (author), de Oliveira Barbosa, J.M. (author), Metrikine, A. (author)

This paper addresses the dynamic response of an infinitely long cylindrical structure embedded in an elastic half-space. The structure has a circular cross-section and its axis is parallel to the half-space surface. Excitation can be incident body waves or forces applied on the surface of the half-space and/or the structure. The model can be...

conference paper 2018

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Analytical relationships for the mechanical properties of additively manufactured porous biomaterials based on octahedral unit cells

Hedayati, R. (author), Sadighi, M (author), Mohammadi-Aghdam, M (author), Zadpoor, A.A. (author)

Additively manufacturing (AM) techniques make it possible to fabricate open-cell interconnected structures with precisely controllable micro-architectures. It has been shown that the morphology, pore size, and relative density of a porous structure determine its macro-scale homogenized mechanical properties and, thus, its biological performance...

journal article 2017

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Evaluation of analytic solutions for steady interface flow where the aquifer extends below the sea

Bakker, M. (author), Miller, Anthony D. (author), Morgan, Leanne K. (author), Werner, Adrian D. (author)

A computational approach is presented for steady Dupuit interface flow where the aquifer extends below the sea. A detailed approach is outlined to determine the head at the coastline so that the solution below the leaky seabed may be combined with any type of steady Dupuit interface flow in the aquifer below the land. The method allows for...

journal article 2017