Wolf Rock Lighthouse Long-Term Monitoring

Wolf Rock Lighthouse is a Victorian era masonry structure located in an extreme environment facing the fiercest Atlantic storms off the southwest coast of England whose dynamic behaviour has been studied since 2016. Initially, a modal test was used to determine modal parameters; then, in 2017, a monitoring system was installed that has...

Infinite dimensional Piecewise Deterministic Markov Processes

In this paper we aim to construct infinite dimensional versions of well established Piecewise Deterministic Monte Carlo methods, such as the Bouncy Particle Sampler, the Zig-Zag Sampler and the Boomerang Sampler. In order to do so we provide an abstract infinite dimensional framework for Piecewise Deterministic Markov Processes (PDMPs) with...

Approximations of Piecewise Deterministic Markov Processes and their convergence properties

Piecewise deterministic Markov processes (PDMPs) are a class of stochastic processes with applications in several fields of applied mathematics spanning from mathematical modelling of physical phenomena to computational methods. A PDMP is specified by three characteristic quantities: the deterministic motion, the law of the random event times...

A Multidisciplinary Computational Framework for Topology Optimisation of Offshore Helidecks

Maintaining offshore steel structures is challenging and not environmentally friendly due to the frequent visits for inspection and repairs. Some offshore lighthouses are equipped with carbon steel helidecks fixed onto their lantern galleries in the 1970s to provide easy and safe access to maintenance staff and inspectors. Even though the...

Long-time behaviour of degenerate diffusions: Ufg-type sdes and time-inhomogeneous hypoelliptic processes

We study the long time behaviour of a large class of diffusion processes on R^N, generated by second order differential operators of (possibly) degenerate type. The operators that we consider need not satisfy the Hörmander Condition (HC). Instead, they satisfy the so-called UFG condition, introduced by Herman, Lobry and Sussman in...

Subgeometric hypocoercivity for piecewise-deterministic markov process monte carlo methods

We extend the hypocoercivity framework for piecewise-deterministic Markov process (PDMP) Monte Carlo established in [2] to heavy-tailed target distributions, which exhibit subgeometric rates of convergence to equilibrium. We make use of weak Poincaré inequalities, as developed in the work of [15], the ideas of which we adapt to the PDMPs of...

Fatigue considerations in view of measured load spectra

An investigation of the static stability and drag of two conical re-entry heads at mach numbers from 0.4 to 1.8

Wind tunnel tests at M=2.0 on interference effects between intake flows in a four-engine nacelle

A model of a rectangular air intake of aspect ratio 8, with all-external compression and a fixed geometry, has been tested at its design Mach number of 2.0 in the 3 ft x 3 ft wind tunnel. The model contained four side-by-side simulated engine cells and tests were made to investigate effects on pressure recovery and mass flow in each of the cells...

Wind tunnel tests at supersonic speeds on a model of the Fairey Delta 2

Results are given of tests at Mach numbers from 1.42 to 2.00, on a 1/24 scale model of the Fairey Delta 2 aircraft. Lift, pitching moment, axial farce, sideforce, yawing moment and rolling moment were measured, giving an assessment of the general stability characteristics, including the effects of airbrakes and a ventral fuel tank. Elevator...

Analyse van de bedrijfsgegevens van het “S.S.Simon Bolivar

Analyse van bedrijfsgegevens van het motorschip Papendrecht

Analyse van de bedrijfsresultaten van het dubbelschroef-motorschip 'Willem Ruys'