The objective of this paper is to describe and apply methods that could assist the propulsion system designer in the evaluation and selection of propulsion technologies. The focus here is on the aerothermodynamic aspects of the problem, particularly estimation of engine internal losses. This is accomplished by leveraging developments in second law analysis methods that are able to quantify the ...

Abstract This paper presents the state of art in electric aircraft propulsion systems. The necessary reduction greenhouse gas emissions on global scale forces aviation engineers to search for ‘green’ solutions. Electric is a potential and relatively intuitive choice flight operations. showcases four architectures systems being now considered utilise advantages with commercially profitable opera...

Based on a comparative analysis of the advantages and disadvantages radioisotope nuclear reactor power generators in space applications, this paper determines that generator is energy scheme Neptune exploration mission, proposes four kinds major scientific problems involved exploration, introduces preliminary ideas, such as function module, fight orbit, design constraints mission....

The configuration of a marine propulsion system is selected with regard to the maximum power resulting from its maximum design speed and displacement. The propulsion systems of high speed vessels use three or even four propellers, and each propulsion unit may be multi-engine. High speed vessels are designed for maximum speeds, but their factual exploitation speed parameters are usually consider...

Distributed propulsion and lightweight structures on transport aircraft pose a significant opportunity to meet next generation aircraft requirements including reduced fuel burn/emissions and enhanced takeoff/landing performance. The objective of this research is to conduct multidisciplinary design analysis and optimization to demonstrate a novel concept of flexible wing shaping aircraft using d...

Wheelchair propulsion has been reported to be responsible for musculoskeletal pain in the upper extremities. Epidemiological studies have shown a high prevalence of shoulder complaints in paraplegic and quadriplegic spinal cord injured (SCI) people. It has been argued that the high incidence of shoulder complaints in SCI was the result of the weight‐bearing or propuls...

This study describes a new simulator that provides haptic biofeedback to help manual wheelchair users gain a more effective propulsion pattern. Propulsion effectiveness is measured using the mechanical effective force (MEF). The simulator implements a dynamic model that replicates overground propulsion conditions. Haptic biofeedback increases the feeling of rolling resistance if the user’s MEF ...

Miniature and energy efficient propulsion systems hold the key to maturing the technology of swimming microrobots. In this paper, two new methods of propulsion inspired by the motility mechanism of prokaryotic and eukaryotic microorganisms are proposed. Hydrodynamic models for each of the two methods are developed and the optimized design paramteres for each of the two propulsion modes are demo...