Topic
Propulsion
About: Propulsion is a research topic. Over the lifetime, 24977 publications have been published within this topic receiving 200311 citations.
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Patent•
13 Oct 1987
TL;DR: A helicopter has two engines adapted to drive a main sustaining rotor and a plurality of auxiliary propulsion means through a transmission system that is selectively operable to vary the relative speeds of rotation of the primary rotor and the auxiliary propulsion mean depending upon operating conditions.
Abstract: A helicopter has two engines adapted to drive a main sustaining rotor and a plurality of auxiliary propulsion means through a transmission system that is selectively operable to vary the relative speeds of rotation of the sustaining rotor and the auxiliary propulsion means depending upon operating conditions.
55 citations
01 Aug 1994
TL;DR: In this article, the authors show that insertion of advanced propulsion technologies enables and/or greatly enhances many planned small satellite missions, such as high pressure Ir/Re bipropellant engines, very low power arcjets, Hall thrusters, and pulsed plasma thrusters.
Abstract: Advanced chemical and low power electric propulsion offer attractive options for small satellite propulsion. Applications include orbit raising, orbit maintenance, attitude control, repositioning, and deorbit of both Earth-space and planetary spacecraft. Potential propulsion technologies for these functions include high pressure Ir/Re bipropellant engines, very low power arcjets, Hall thrusters, and pulsed plasma thrusters, all of which have been shown to operate in manners consistent with currently planned small satellites. Mission analyses show that insertion of advanced propulsion technologies enables and/or greatly enhances many planned small satellite missions. Examples of commercial, DoD, and NASA missions are provided to illustrate the potential benefits of using advanced propulsion options on small satellites.
55 citations
TL;DR: Energy and power flow information during wheelchair propulsion allows us to gain a better understanding of the coordination of the movement by the musculoskeletal system.
55 citations
Patent•
20 Aug 2010
TL;DR: In this article, a hybrid marine propulsion system with a main engine and a motor is described, in which the main engine is assisted by a motor generator and the generator is mounted on a floor and connected directly to the other end of the input/output shaft.
Abstract: In a hybrid type marine propulsion device including a main engine and a motor, low fuel consumption is realized by a compact configuration and highly efficient drive control. A marine propulsion device includes a clutch 7 provided on an input shaft 6 of a main engine, a horizontal input/output shaft 8 connected to the clutch, a vertical shaft 11 connected to the input/output shaft through an upper bevel gear 9, a horizontal propeller shaft 13 connected to a lower end of the vertical shaft through a lower bevel gear 12, and a propeller 14 at the other end side of the propeller shaft, in which the propeller is revolved around the vertical shaft to set a propulsion direction, wherein a motor generator 20 is mounted on a floor 3, and connected directly to the other end side of the input/output shaft. In a low rotation region, motor propulsion is performed, and in a high rotation region, hybrid propulsion in which the main engine is assisted by the motor is performed.
55 citations
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TL;DR: In these early ships, the electrical propulsion system acted as a gearbox, and shipboard power requirements were dwarfed by those of propulsion as discussed by the authors, and the electric propulsion system later gave way to mechanical drive systems.
Abstract: Electric ship propulsion systems could be found on marine vessels a century ago. In these early ships, the electrical propulsion system acted as a gearbox, and shipboard power requirements were dwarfed by those of propulsion. While electric propulsion systems later gave way to mechanical drive systems, the past two decades have seen a resurgence in electric ship technology.
55 citations