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Maximizing ollie height by optimizing control strategy and skateboard geometry using direct collocation

Heinen, Jan T. (author), Brockie, S.G. (author), ten Broek, Raymund (author), van der Kruk, E. (author), Moore, J.K. (author)

The ollie is the base aerial human–board maneuver, foundational to most modern skateboarding tricks. We formulate and solve an optimal control problem of a two-dimensional simplified human model and a rigid body skateboard with the objective of maximizing the height of the ollie. Our solution simultaneously discovers realistic human-applied...

journal article 2024

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Distributed Adaptive Synchronization in Euler Lagrange Networks with Uncertain Interconnections

Tao, T. (author), Roy, Spandan (author), De Schutter, B.H.K. (author), Baldi, S. (author)

In this work we propose a new practical synchronization protocol for multiple Euler Lagrange (EL) systems without structural linear-in-the-parameters (LIP) knowledge of the uncertainty and where the agents can be interconnected before control design by unknown state-dependent interconnection terms. This setting is meant to overcome two...

journal article 2024

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Underwater noise from vibratory pile driving with non-linear frictional pile–soil interaction

Molenkamp, T. (author), Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)

Vibratory offshore pile driving offers a potential solution for reducing the underwater noise generated during the installation of foundation piles compared to using impact hammers. Existing noise prediction models are specifically tailored to impact pile driving scenarios. This paper introduces a novel methodology for underwater noise...

journal article 2024

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Influence of surface roughness on the mode II fracture toughness and fatigue resistance of bonded composite-to-steel joints

Feng, W. (author), Moreira Arouche, M. (author), Pavlovic, M. (author)

Hybrid bi-material concepts in engineering structures where fibre-polymer composites are used together with steel structural members have potential to reduce material usage, extend fatigue life and improve structural reliability. The bond performance of the bi-material composite-to-steel interface is of crucial importance and highly relies on...

journal article 2023

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Plasma-sprayed Al₂O₃-TiB₂-SiC ternary composite coatings and its wear behaviour based on SiC content

Mirhosseini, Seyed Hossein (author), Mosallaee, Masoud (author), Razavi, Mansour (author), Fotouhi, M. (author)

This paper aims to study the effect of adding different SiC content on the wear performance of Al₂O₃-TiB₂-SiC ternary composite coatings produced by the air plasma spraying process. The study used SHS powders as primary materials, consisting of H₃BO₃, Al, and TiO₂, and 5, 10,...

journal article 2023

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Experimental comparison of the transition speed of a hydrodynamic journal bearing lubricated with oil and magnetorheological fluid

van der Meer, G.H.G. (author), Quinci, F. (author), Litwin, W. (author), Wodtke, M. (author), van Ostayen, R.A.J. (author)

A journal bearing test bench is used to find the transition speed between the hydrodynamic and mixed lubrication regimes for a modified magnetorheological (MR) fluid. It is shown that the transition speed of the bearing can be reduced by applying a local magnetic field near minimum film when it is lubricated with the MR fluid, and that this...

journal article 2023

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Active lateral force feedback using resonant traveling waves

Cai, Z. (author), Wiertlewski, M. (author)

The sensation of touching virtual texture and shape can be provided to a touchscreen user by varying the friction force. Despite the saliency of the sensation, this modulated frictional force is purely passive and strictly opposes finger movement. Therefore, it is only possible to create forces along the direction of movement and this...

journal article 2023

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Submillimeter lateral displacement enables friction sensing and awareness of surface slipperiness

Afzal, Hafiz Malik Naqash (author), Stubbs, Emma (author), Khamis, Heba (author), Loutit, Alastair J. (author), Redmond, Stephen (author), Vickery, Richard Martin (author), Wiertlewski, M. (author), Birznieks, Ingvars (author)

Human tactile perception and motor control rely on the frictional estimates that stem from the deformation of the skin and slip events. However, it is not clear how exactly these mechanical events relate to the perception of friction. This study aims to quantify how minor lateral displacement and speed enables subjects to feel frictional...

journal article 2022

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Validation of the resistance of a plate moving through mud: CFD modelling and towing tank experiments

Lovato, S. (author), Kirichek, Alex (author), Toxopeus, S.L. (author), Settels, J.W. (author), Keetels, G.H. (author)

When investigating the effect of muddy seabeds on marine vessels using Computational Fluid Dynamics (CFD) software, one challenge is to adequately describe the complex non-Newtonian fluid behaviour of mud. Although a number of rheological models have been proposed in the past, mud sediments are often simply regarded either as highly viscous...

journal article 2022

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Learning to Feel Textures: Predicting Perceptual Similarities From Unconstrained Finger-Surface Interactions

Richardson, Benjamin A. (author), Vardar, Y. (author), Wallraven, Christian (author), Kuchenbecker, Katherine J. (author)

Whenever we touch a surface with our fingers, we perceive distinct tactile properties that are based on the underlying dynamics of the interaction. However, little is known about how the brain aggregates the sensory information from these dynamics to form abstract representations of textures. Earlier studies in surface perception all used...

journal article 2022

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Controls on the spatio-temporal patterns of induced seismicity in Groningen constrained by physics-based modelling with Ensemble-Smoother data assimilation

Candela, Thibault (author), Pluymaekers, Maarten (author), Ampuero, Jean Paul (author), Van Wees, Jan Diederik (author), Buijze, Loes (author), Wassing, Brecht (author), Osinga, Sander (author), Grobbe, Niels (author), Muntendam-Bos, A.G. (author)

The induced seismicity in the Groningen gas field, The Netherlands, presents contrasted spatio-temporal patterns between the central area and the south west area. Understanding the origin of this contrast requires a thorough assessment of two factors: (1) the stress development on the Groningen faults and (2) the frictional response of the...

journal article 2022

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Developing a new acoustic emission source classification criterion for concrete structures based on signal parameters

Zhang, F. (author), Yang, Y. (author), Fennis, Sonja A.A.M. (author), Hendriks, M.A.N. (author)

Acoustic emission (AE) signal parameters can be used to classify the source type in concrete structures. However, signal parameters are influenced by the wave propagation from the source to the receiver, leading to wrong source classification results, especially for monitoring large concrete structures. This paper experimentally evaluates the...

journal article 2022

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A 2D dual-scale method to address contact problems

Aramfard, Mohammad (author), Pérez-Ràfols, Francisco (author), Nicola, L. (author)

A seamless 2D dual-scale computational scheme is developed to study contact problems. The model consists of an atomistic domain close to the contact, coupled with an elastic continuum domain away from the contact. The atomistic formulation provides a description of the contact interaction through interatomic potentials and permits to capture...

journal article 2022

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Lubrication of rough copper with few-layer graphene

Bian, Jianjun (author), Nicola, L. (author)

It has been demonstrated through experiments and simulations that friction decreases significantly when graphene is used as a solid lubricant on various materials. However, the effect of increasing the number of graphene layers on lubrication is controversial. Some studies predict an increase of friction with the number of layers that can be...

journal article 2022

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Unifying Model-Based and Neural Network Feedforward: Physics-Guided Neural Networks with Linear Autoregressive Dynamics

Kon, Johan (author), Bruijnen, Dennis (author), van de Wijdeven, Jeroen (author), Heertjes, Marcel (author), Oomen, T.A.E. (author)

Unknown nonlinear dynamics often limit the tracking performance of feedforward control. The aim of this paper is to develop a feedforward control framework that can compensate these unknown nonlinear dynamics using universal function approximators. The feedforward controller is parametrized as a parallel combination of a physics-based model and...

conference paper 2022

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Experimental Validation of Torque-Based Control for Realistic Handwheel Haptics in Driving Simulators

Damian, Mircea (author), Shyrokau, B. (author), Carrera Akutain, Xabier (author), Happee, R. (author)

A realistic steering feel is one of the key elements to guarantee fidelity on a driving simulator in general, and in particular to replicate on-centre vehicle handling. This requires precise modelling of the steering dynamics, a high bandwidth control loading system, and coupling of virtual and physical components in agreement with...

journal article 2022

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Multi-degree-of-freedom systems with a Coulomb friction contact: Analytical boundaries of motion regimes

Marino, Luca (author), Cicirello, A. (author)

This paper proposes an approach for the determination of the analytical boundaries of continuous, stick-slip and no motion regimes for the steady-state response of a multi-degree-of-freedom (MDOF) system with a single Coulomb contact to harmonic excitation. While these boundaries have been previously investigated for single-degree-of-freedom ...

journal article 2021

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Estimation of the modulation of friction from the mechanical impedance variations

Huloux, Nicolas (author), Bernard, Corentin (author), Wiertlewski, M. (author)

Ultrasonic surface-haptic touchscreens produce compelling tactile sensations directly on the users' fingertips. The tactile sensations stem from the modulation of friction produced by acoustic radiation pressure, which reduces the contact between the skin and the glass plate. During this process, some of the vibrations are partly absorbed by...

journal article 2021

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Vibration-assisted decommissioning of a slip joint: Application to an offshore wind turbine

Cabboi, A. (author), Kamphuis, Thijs (author), van Veldhuizen, E. (author), Segeren, M.L.A. (author), Hendrikse, H. (author)

An alternative option to the traditional grouted joint for wind turbines is a direct steel-to-steel connection, also known as slip joint. In a recently published work, a proof of concept of a vibration-assisted installation and decommissioning technique of a slip joint was illustrated. Leveraging on the obtained results, the current study shows...

journal article 2021

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How to measure the area of real contact of skin on glass

Huloux, Nicolas (author), Willemet, L. (author), Wiertlewski, M. (author)

The contact between the fingertip and an object is formed by a collection of micro-scale junctions, which collectively constitute the real contact area. This real area of contact is only a fraction of the apparent area of contact and is directly linked to the frictional strength of the contact (i.e., the lateral force at which the finger...

journal article 2021