THE ADVANCED TECHNOLOGY MAST FOR HMS ARK ROYAL

SUMMARY The Royal Navy has adopted composites technology for use in its advanced technology mast. The mast has been designed, installed and is currently in-service on one of the UK's aircraft carriers, HMS Ark Royal. The multi-functionality of the materials has enabled the varied and complex design drivers to be met

The Measurement and Prediction of Gaseous Hydrocarbon Fuel AutoIgnition Delay Time at Realistic Gas Turbine Operating Conditions,” ASME Paper

ABSTRACT Auto-ignition delay time measurements have been attempted for a variety of gaseous fuels on a flow rig at gas turbine relevant operating conditions. The residence time of the flow rig test section was approximately 175 ms. A chemical kinetic model has been used in Senkin, one of the applications within the Chemkin package, to predict the auto-ignition delay time measured in the experiment. The model assumes that chemistry is the limiting factor in the prediction and makes no account of the fluid dynamic properties of the experiment. Auto-ignition delay time events were successfully recorded for ethylene at approximately 16 bar, 850K and at equivalence ratios between 2.6 and 3.3. Methane, natural gas and ethylene (0.5 < φ < 2.5) failed to auto-ignite within the test section. Model predictions were found to agree with the ethylene measurements, although improved qualification of the experimental boundary conditions is required in order to better understand the dependence of auto-ignition delay on the physical characteristics of the flow rig. The chemical kinetic model used in this study was compared with existing 'low temperature' measurements and correlations for methane and natural gas and was found to be in good agreement

Authors

The research and development in this work package are aimed at the challenge of pushing back the limitations on the size and complexity of a system, in its broadest sense, that can be modelled and analysed tractably by automated verification tools. The kinds of model that arise in analysing mobile routing protocols, and in replication for Quality of Service, are certain to tax the capabilities of the tools, as we have already reported in Deliverable D3. The development of CSP models, and their analysis using the FDR refinement checker, are two of the principal formal underpinnings of this project. This Deliverable reports on two main strands of research and development, both aimed at improving the capacity for modelling and analysis using CSP and FDR: • The design and prototype implementation of a technique that allows FDR to apply hierarchical compression to a wider range of examples. Hierarchical compression allows one to address problems outside the sphere which can be analysed through explicit state enumeration. These techniques have been tried out on an example from the models of the MIT Grid Location Service and Geographic Forwarding routing strategy that were created in Task 5.1 and reported in Deliverable D3. Together with Bluetooth examples, these models will form unifyin

SEA 6 Technical report: underwater ambient noise

This report has been prepared by QinetiQ as part of the UK Department of Tradeand Industry (Dti) offshore energy Strategic Environmental Assessment (SEA)programme. This technical report is part of the SEA 6 process which covers thearea from Milford Haven northwards through St Georges Channel, the Irish Sea,The North Channel and up into the outer Clyde Estuary. This report looks at thesources of underwater noise that combine to provide the background ambient noiselevels in the shallow waters of the SEA 6 area, considers the mechanisms by whichthe sound is generated and may then be modified by the environment. Options forcharacterising ambient noise levels in the SEA 6 area are presented

The rolling resistance of truck tyres under a dynamic vertical load, Veh

The paper deals with tyre modelling to predict the rolling resistance of truck tyres under a dynamic vertical load. A model originating from Pacejka is applied and modified to perform the necessary calculations. The predictions are compared with the available experimental data on rolling resistance under dynamic vertical load given by Popov et al. The analysis is extended into a larger frequency range so that other models can be also discussed and compared. Within the frequency range considered and based on the experimental data, Pacejka's model appears to give the best results