Browsing by Author "Mohseni, Martina"
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Item Open Access Helix-simulation framework development for assessment of rotorcraft engines(Cranfield University, 2011-03) Mohseni, Martina; Pachidis, Vassilios; Pilidis, PericlesThe inevitable growth of air traffic resulting from the increasing demands on utilization of the aircraft for various purposes has introduced public awareness and concern about the contribution of air traffic towards climate change. The increase of aircraft emissions enhancing the greenhouse effect and decreasing the air quality in general, is no longer considered sustainable and steps are being taken towards the mitigation of this problem. Although a significant research activity takes place in the development of new technologies, the most readily available solution to this problem is seen in applying changes to aircraft operational rules and procedures and in optimizing the flight paths using the aircraft currently in service. The helicopter, although comprising a significantly smaller portion of the aircraft market in comparison with the fixed-winged aircraft, is experiencing the same concerns with respect to the amount of gaseous emissions produced. The helicopter plays a specific and irreplaceable role in the air transportation and it is often being used for purposes where the environmental concerns are secondary (such as during medical rescue operations or during police missions). It is however being increasingly employed for non-urgent operations, such as executive business travel or for the transportation of personnel to and from oil rigs. In all cases, the most readily available solution (and also perhaps the least costly) to lowering the gaseous emissions is to evaluate the helicopter engine performance along a given flight path using a computer program in order to investigate the effect on fuel burn and gaseous emissions. Cont/d.Item Open Access Simulation framework development for helicopter mission analysis(American Society of Mechanical Engineers (ASME), 2010-12-22) Goulos, Ioannis; Mohseni, Martina; Pachidis, Vassilios; D’Ippolito, Roberto; Stevens, JosHelicopter mission performance analysis has always been an important topic for the helicopter industry. This topic is now raising even more interest as aspects related to emissions and noise gain more importance for environmental and social impact assessments. The present work illustrates the initial steps of a methodology developed in order to acquire the optimal trajectory of any specified helicopter under specific operational or environmental constraints. For this purpose, it is essential to develop an integrated tool capable of determining the resources required (e.g. fuel burnt) for a given helicopter trajectory, as well as assessing its environmental impact. This simulation framework tool is the result of a collaborative effort between Cranfield University (UK), National Aerospace Laboratory NLR (NL) and LMS International (BE). In order to simulate the characteristics of a specific trajectory, as well as to evaluate the emissions that are produced during the helicopter’s operation within the trajectory, three computational models developed at Cranfield University have been integrated into the simulation tool. These models consist of a helicopter performance model, an engine performance model and an emission indices prediction model. The models have been arranged in order to communicate linearly with each other. The linking has been performed with the deployment of the OPTIMUS process and simulation integration framework developed by LMS International. The optimization processes carried out for the purpose of this work have been based on OPTIMUS’ built-in optimizing algorithms. A comparative evaluation between the optimized and an arbitrarily defined baseline trajectory’s results has been waged for the purpose of quantifying the operational profit (in terms of fuel required) gained by the helicopter’s operation within the path of an optimized trajectory for a given constraint. The application of the aforementioned methodology to a case study for the purpose of assessing the environmental impact of a helicopter mission, as well as the associated required operational resources is performed and presented.