Development of a diagnostics model for the GEnx-1B turbofan engine using on-wing performance data

Gas path analysis (GPA) plays a major role in turbofan condition monitoring. GPA uses thermodynamic engine models to identify deterioration of individual turbofan components. The accuracy of GPA results depends on the quality of the engine models. Turbofan performance is influenced by secondary performance parameters, which include variable...

Dynamic Load Prediction in Offshore Wind Turbines

The rapid development of the wind industry over the past few years has pushed turbine manufacturers to meet the growing energy demands by designing and producing large scale wind turbines.This also means development of larger monopile foundations for the foundation designers in the case of offshore wind turbines.\ Generally, the turbine tower...

Managing complexity of Digital Twin models: Development of NewMODE as a network theory approach to model decomposition

Modelling and simulation is at the heart of Digital Twin technology, which is revolutionising many industries. Organisations have access to legacy models that are too complex to maintain, preventing them from operationalising complex systems like Digital Twin. By creating an automated tool for model decomposition, it is possible to breathe life...

Electric trucks: wishful thinking or the real deal?: The potential of electric tractor-trailers as a means of CO2,eq reduction in the Netherlands by 2030

In this thesis a simplified vehicle model was developed using linear correlations between incidental power demand and energy usage at four different stages: 1) propulsion, 2) propulsion during braking, 3) regenerative braking, and 4) maximum regenerative power. In the model the efficiencies of: charging and discharging of the battery, the...

Influence of Nonlinear Hydrodynamic Response on the Fatigue Damage of a FOWT: Development of Method to Assess Hydrodynamic Nonlinear Response of a FOWT, Having Allowance for Platform-Turbine Coupling Effects and Combined Wind and Wave Loads.

A method has been developed with which the rigid-body motions, stress and fatigue damage response of a TLP-type FOWT are determined in time domain, with the aim of assessing the influence of non-linear hydrodynamic response on the fatigue damage. The dynamics are described by means of a system of coupled 6DOF-EoMs and solved in Matlab, after...

Business Model Development at the BoP: Creating a Business Model Canvas for the sub-Saharan African region & drawing on findings to develop suggestions for the Frugal Thermometer

Modeling and Characteristics of a Novel Multi-fuel Hybrid Engine for Future Aircraft

Civil air transportation has undergone significant expansion over the past decades and is continuing to grow. Nevertheless, the tendency of energy depletion and the severe environmental problems yield challenges in its further development. To mitigate the climate impact of civil aviation, the Advisory Council for Aeronautics Research in Europe ...

Application of the SES framework for model-based analysis of the dynamics of social-ecological systems

Social-ecological systems (SES) are dynamic systems that continuously change in response to internal or external pressures. A better understanding of the interactions of the social and ecological systems that drive those dynamics is crucial for the development of sustainable management strategies. Dynamic models can serve as tools to explore...

Technologies and Business Model Explorations for Risks and Performances Management in Dutch Commercial Buildings

Priva is a Dutch company in the field of indoor control and automation. Its two main business segments are commercial building control and greenhouse control. In the commercial building segment, Priva’s business currently specializes in Heating, Ventilation and Air Conditioning (HVAC) control, floor control and energy management.However,...

Modelling dependencies and couplings in the design space of meshing gear sets

This work presents a design methodology based on the combination of a set of compatibility equations for determining nominal tooth and cutter geometry and a set of tooth contact analysis equations for determining modified tooth surfaces and motion transmission laws. Both have been shown separately to lead to various optimisations, and some...

Elements of a flexible approach for conceptual hydrological modeling: 1. Motivation and theoretical development

This paper introduces a flexible framework for conceptual hydrological modeling, with two related objectives: (1) generalize and systematize the currently fragmented field of conceptual models and (2) provide a robust platform for understanding and modeling hydrological systems. In contrast to currently dominant “fixed” model applications, the...

Elements of a flexible approach for conceptual hydrological modeling: 2. Application and experimental insights

In this article's companion paper, flexible approaches for conceptual hydrological modeling at the catchment scale were motivated, and the SUPERFLEX framework, based on generic model components, was introduced. In this article, the SUPERFLEX framework and the “fixed structure” GR4H model (an hourly version of the popular GR4J model) are applied...

Can REDD+ contribute to private sector development in sustainable fuelwood and charcoal production in Rwanda?

The expected increase in future demand of biomass feedstock in Rwanda cannot be met because of constraints at the supply side. This has a negative effect on the energy security for Rwandese in the future and the income generated for the Rwandan population involved in biomass feedstock production. There are, however, opportunities to stimulate...

Object Oriented Modeling: A method for combining model and software development

When requirements for a new model cannot be met by available modeling software, new software can be developed for a specific model. Methods for the development of both model and software exist, but a method for combined development has not been found. A compatible way of thinking is required to combine modeling and software development into a...

Learning from model improvement: On the contribution of complementary data to process understanding

A priori determined model structures are common in catchment rainfall-runoff modeling. While this has resulted in many ready-to-use modeling tools, there are several shortcomings of a one-size-fits-all model structure. The uniqueness of catchments with respect to their hydrological behavior and the need to adapt model complexity to data...

A multi-body dynamics approach to a cable simulator for kites

For the purpose of ultimately building a fully dynamic simulation of kites, an investigation is launched into a viable model of the cable with which the kite is attached to the ground. In the model proposed in this paper, only the slow modes of motion are taken into account due to the fact that only the slow motions have a real effect on the...

A comparison of alternative multiobjective calibration strategies for hydrological modeling

A conceptual hydrological model structure contains several parameters that have to be estimated through matching observed and modeled watershed behavior in a calibration process. The requirement that a model simulation matches different aspects of system response at the same time has led the calibration problem toward a multiobjective approach....

An application to model traffic behaviour on freeways with Getram.AIMSUN2: A calibration procedure for micro-dynamic traffic modelling

To study traffic flow characteristics at freeways, traffic model s are used. One of these traffic models is the micro-dynamic traffic model Getram/AIMSUN2 (in this study referred to as AIMSUN2) developed at the Barcelona University of Technology (UPC). DHV Environment and Infrastructure is using this software package for traffic modelling in the...