40 research outputs found
Inhale - Live album launch
No full textLive album launch of the album 'Inhale' by Jonathan Crossley. Supported by the ICCaT group at Liverpool University, the album was recorded at Flame Studios, Constitution Hill Johannesburg in April and June of 2022. The album features compositions by Jonathan Crossley and Nicholas Horsten with Jonathan Crossley on guitar and technologies, Carlo Mombellli on bass (Wits, Johannesburg) and Jonno Sweetman on drums (Cape Town). String were provided by the Johannesburg Philharmonic and audio recording and mixing was by JB Arthur
Inhale - Live in Johannesburg, supported by Concerts SA
No full textSouth African album launch of the album 'Inhale' by Jonathan Crossley. Supported by the ICCaT group at Liverpool University, the album was recorded at Flame Studios, Constitution Hill Johannesburg in April and June of 2022. The album features compositions by Jonathan Crossley and Nicholas Horsten with Jonathan Crossley on guitar and technologies, Carlo Mombellli on bass (Wits, Johannesburg) and Jonno Sweetman on drums (Cape Town). String were provided by the Johannesburg Philharmonic and audio recording and mixing was by JB Arthur.
This performance was sponsored by Concerts SA and their partners, The Royal Norwegian Embassy, SAMRO and IKS Consulting
Low-Speed Model Support Interference - Elements of an Expert System
No full textWind tunnel support interference is one of the constraints affecting the quality of wind tunnel measurements. Several methods to determine the interference are experimental- empirical- and numerical methods. Experimental methods are often time consuming and costly. This also holds for empirical methods as they are founded on a vast number of experimental data sets. CFD is also found to be time consuming and sometimes computationally expensive. Future guidelines for the treatment of support interference aim at providing engineers more alternatives. Such alternatives require however an extensive knowledge on experiments and CFD: it requires the engineer to be an expert in the field, something that is often impossible. Engineers should therefore be guided by an expert system (a computer program that represents and reasons with knowledge of some specialist subject with a view to solving problems or giving advice) in their dealings with support interference. In this thesis such an application-based expert system is considered. The system focuses on low-speed model support interference on single sting mounted models carrying an internal balance. The research objective of this thesis is stated as: ''To identify the necessary elements for the design of an expert system for support interference on sting mounted models carrying internal balances applicable to low-speed wind tunnels.'' In this thesis the necessary components of such an expert system are identified through a study on the elements of its knowledge base and a study on a feasible structure of the system in terms of its applications. Considering the study on the elements of its knowledge base, experimental- and numerical research is carried out to gain intelligibility on support interference. It is shown that a support break down facilitating the treatment of disturbances of individual support parts spanning a certain setup is a systematic method to analyze support interference. The order of magnitude and the nature of the disturbances are not compromised when this approach is adopted provided that the amount of separate parts is kept to a minimum. This approach enables the crucial study on the disturbances of the model sting that causes the complete spectrum of support disturbances. Advantages of studying the sting include the possibility to generalize the research results to a wider class of support structures, allow for a qualitative analysis on the nature of near-field and far-field effects but also a qualitative and quantitative validation of several methods applied to determine support interference. Comparing measurements (balance measurements and 5-hole probe measurements) to calculations (panel code- and Euler calculations) on model sting near-field and far-field effects shows that without knowing the specific details of a complex interference flow field, it is not justified (from the viewpoint of accuracy) to determine model sting near-field and far-field effects using methods at low levels of complexity and intrinsic accuracy. Significant calculation offsets (out of the bounds of experimental accuracy) are caused by the action of the balance cavity and slit, vorticity and viscosity. In depth understanding of the limitations of these numerical methods (panel code, Euler) can only be developed when the interference flow field itself is understood both qualitatively and quantitatively. Navier-Stokes calculations are used for this purpose. Calculations provide a qualitative image of the interference flow field that complies with measurements. Quantitatively, the Navier-Stokes calculations are not able to determine the values of the interference with the right trends and within typical measurement (balance) accuracy. Gained near-field flow knowledge is used for an assessment of the potential of various numerical and experimental methods in determining the near-field and far-field model sting effects on wind tunnel models at low speed for various sting placements. This knowledge is generalized such as to cover the treatment of the remaining support for typical sting mounted setups. Considering the numerical and experimental treatment of support disturbances of any support part it is concluded that classification parameters ''accuracy'' and ''effort'' (classifying the various methods for the determination of the interference) oppose each other: accurate methods demand a lot of implementation effort and vice versa. This opposition can not be solved by designing a custom-made model (that is both accurate and requires a low amount of implementation effort) for calculating model support interference. Such a model should calculate the disturbance effects fast (by incorporating only the disturbance factors of primary quantitative interest) with the right trends and magnitude. Solving for the confinements of such models implies an inevitable reduction in the applicability range of the model. Typical custom-made models are unsuitable for implementation in the expert system. They reveal the following rule of thumb: ''High accuracy (at a minimum equal to typical balance Delta-measurement accuracy) and low implementation effort (total measurement effort or modeling effort and computational effort) of a correction method for determining model support interference are currently incompatible when a wide range of applicability (freestream conditions, setups) is desired''. This rule of thumb necessitates a more elaborate definition of the expert system's requirements on speed and accuracy, resulting in an expert system with an application-based structure. The applications with given accuracy and speed assist in four stages defining a typical commercial wind tunnel measurement: negotiations at the client, test preparation phase, performing the measurements and finally the post test corrections. Next a closer look is taken at a feasible structure of the expert system. The proposed application-based structure fulfills the expert system's main requirements: advise on the test setup/correction methods, calculate the interference fast enough and accurate enough pre-test and on-line, correct for the interference on-line and off-line and allow easy plug-in of modules dealing with the problem of wall interference. Additional requirements relate to the use of the system (meet computer platform standards and be user friendly with professional interfaces). Typical necessary system elements are identified: the expanded knowledge base on model support interference has resulted in two basic expert applications (ESI and ASID, directly applicable for measurements in the LLF of DNW for which they are customized) and new methods (VOLAER and MVL) to approach the problem of wind tunnel wall- and support interference. These products are seen as basic elements of an expert system (generalizable to other wind tunnels). MVL (a method combining both uncorrected wind tunnel measurements and vortex-lattice calculations) proves to be particularly valuable as it predicts the interference of wind tunnel walls, support and includes secondary interference (when e.g. the support is traversed close to the wind tunnel walls). MVL is suitable for all support setups in all types of wind tunnels provided a vortex-lattice method is used enabling an accurate representation of the model aerodynamic derivatives (preferably including the effects of viscosity). MVL's prediction capabilities necessitates the use of multiple boundary conditions (interference values) in order to guarantee a stable solution thereby categorizing it as an interpolation tool with the potential of decreasing the amount of necessary experimental balance Delta-measurements. Currently, a very basic variant of an expert system is presented in this thesis and its necessary elements are identified. This is seen as a good initiative towards meeting the future needs. It is believed that the future needs can be met when further development of this expert system is stimulated. Increasing data availability and updating the applications is of utmost importance in this matter. To the authors opinion, the data availability can be expanded to exceed the companies thresholds and to span multiple companies and countries. In this light, cooperation might very well be seen as the most important future need of all.AerodynamicsAerospace Engineerin
Organisatiegericht huisvesten
No full textElke organisatie komt vroeg of laat voor de vraag te staan, welke huisvesting het beste past bij de organisatie. Of dit nu is naar aanleiding van een noodzakelijke renovatie van het bestaande gebouw, verhuizing naar een ander gebouw, nieuwbouw, of als onderdeel van de normale bedrijfsvoering. Wat werkt beter: een traditioneel cellenkantoor of een kantoorconcept met gebruik van flexibele werkplekken, al dan niet in een meer open setting? Hoe stemmen we de huisvesting af op het bedrijfsbeleid, de organisatiedoelen, de werkprocessen en wensen van de medewerkers? Kortom: hoe realiseren we een op onze organisatie toegespitste huisvesting? In dit hoofdstuk geven we concreet handen en voeten aan het begrip organisatiegericht huisvesten. Er wordt eerst kort stilgestaan bij het begrip organisatiegericht huisvesten en verwante termen. Vervolgens introduceren we twee tools ter ondersteuning van de planontwikkeling en besluitvorming: een huisvestingkeuze model dat relevante componenten in de besluitvorming op overzichtelijke wijze en procesmatig in de tijd positioneert, en een keuzematrix waarin huisvestingsdoelstellingen gekoppeld worden aan conceptuele keuzes voor de plaats, de lay-out en het gebruik van werkplekken en andere voorzieningen. Deze instrumenten zijn ontwikkeld op basis van literatuurstudie, participatie in huisvestingsprocessen en evaluatieve studies naar gebruik en beleving van verschillende kantooromgevingen (Koppejan, Van der Voordt, Hartjes-Gosselink, 2008).Accepted ManuscriptReal Estate Managemen
A New Hybrid Method to Correct for Wind Tunnel Wall- and Support Interference On-line
No full textBecause support interference corrections are not properly understood, engineers mostly rely on expensive dummy measurements or CFD calculations. This paper presents a method based on uncorrected wind tunnel measurements and fast calculation techniques (it is a hybrid method) to calculate wall interference, support interference and residual interference (when e.g. a support member closely approaches the wind tunnel walls) for any type of wind tunnel and support configuration. The method provides with a simple formula for the calculation of the interference gradient. This gradient is based on the uncorrected measurements and a successive calculation of the slopes of the interference-free aerodynamic coefficients. For the latter purpose a new vortex-lattice routine is developed that corrects the slopes for viscous effects. A test case of a measurement on a wing proves the value of this hybrid method as trends and orders of magnitudes of the interference are correctly determined.Aerodynamics & Wind EnergyAerospace Engineerin
Engine Power Effects on Support Interference
No full textRenewed interest in propeller propulsion on aircraft configurations combined with higher propeller loads lead to the question how the effects of the propulsion on model support disturbances should be accounted for. In this paper, the determination of engine power effects on support interference of sting-mounted models is demonstrated by a measurement on a four-engine turboprop aircraft. CFD results on a more generic model are presented in order to clarify the possible mechanism behind engine power effects on support interference. The engine slipstream induces a local change in angle of sideslip at the model sting thereby influencing the sting near-field and far-field effects. Whether or not the net result of these changes in the disturbance pattern leads to a significant engine power effect depends on the configuration of the wind tunnel model and the test setup.Aerodynamics & Wind EnergyAerospace Engineerin
Reflection Ptychography via Auto Differentiation on a High Harmonic EUV beamline
No full textWe demonstrate our beamline using a table-top HHG EUV source for lensless imaging application in reflection m ode. T he s ample r eflection fu nction is reconstructed using an auto-differentiation based ptychographic algorithm built on TensorFlow platform.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.ImPhys/Coene groupImPhys/Optic
Pipe uplift in liquefied sands: The case of induced earthquakes in the Groningen area
No full textThis study considers pipe uplift in liquefied sands in case full liquefaction occurs in the Groningen area. Due to the short vibration time, approximately 2 seconds, uplift is considered in fully liquefied sands without vibrations. The liquefaction time and resistance against uplift are determined by experiments. The resistance against uplift is determined for pipe diameters of 110mm, 160mm and 200mm.Geo-engineeringGeoscience & EngineeringCivil Engineering and Geoscience
The Design of Inflatable Hydraulic Structures
No full textAdditional thesis with a size of 10 European Credits. A Finite Element Method model is established for an inflatable barrier. The inflatable storm barrier of Ramspol in the Netherlands is taken as reference project. The FEM program that is used is called EASY and is specialized in highly deformable structures. With the model, an optimal design for the abutments of the barrier is found.Hydraulic EngineeringCivil Engineering and Geoscience
Design Study of a Flexible-Membrane Tsunami Barrier Concept
No full textThe inundation height of the Tohoku tsunami of 2011 exceeded the design levels of many coastal barriers and several structures collapsed. Hundreds of seawalls and breakers are (planned to be) (re)built in the Tohoku district. There is much debate about the conventional tsunami walls and it is therefore suggested to consider alternative tsunami barrier. One of the latest innovations in the field o ftsunami barriers, is the so-called 'Tsunami Catcher'. This is a flexible-membrane barrier which is self-deploying when a tsunami occurs, due to the buoyancy of a floating element. The floater is connected to a membrane and cables which hold the floater on its position. During normal conditions, the membrane is folded in a trench-tpye structure and does not form a visual obstruction of the coastline. In this report, a feasibility assesment of the flexible-membrane barrier for the case study of Kamakura is completed.Civil Engineering and GeosciencesHydraulic EngineeringCivil Engineering, Hydraulic Engineering, Hydraulic Structure
