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•
02 Jul 1984
TL;DR: In this article, the flywheel is connected with the crankshaft of the internal combustion engine by a first clutch and with the input shaft of the change-speed transmission by a second clutch.
Abstract: A propulsion system for use in automotive vehicles wherein the flywheel is connectable with the crankshaft of the internal combustion engine by a first clutch and with the input shaft of the change-speed transmission by a second clutch. When the engine would be idling (such as during stoppage of the vehicle at an intersection) or running unnecessarily for another reason (such as during coasting of the vehicle), the two clutches are disengaged and the flywheel rotates by inertia to restart the engine, when necessary, in response to engagement of the first clutch. If the RPM of the flywheel reaches a preselected lower threshold value, a starter-generator unit automatically accelerates the flywheel so that its RPM rises above the threshold value and is thus sufficient to ensure that the engine is restarted on engagement of the first clutch. The starter-generator unit has a rotor which is mounted directly on the flywheel and a stator which surrounds the rotor with minimal clearance and is connected directly to the housing of the engine. The generator of the starter-generator unit is a heteropolar Schmidt-Lorenz generator.
47 citations
TL;DR: The present paper presents a methodology to efficiently cope with the design problem of hybrid-electric propulsion based on an optimal approach where take-off weight is minimized, and constraints are included to assure meeting the mission performance requirements while not exceeding any technological limit.
47 citations
TL;DR: This work reviews the nature of multimode propulsion, mission analyses, benefits, and specific multimode concepts, and reviews the most recent attention to Electrospray electric propulsion paired with monopropellant chemical propulsion.
47 citations
Patent•
14 Feb 1944
47 citations
Patent•
13 Jul 2005TL;DR: In this article, an aircraft propulsion system (10) or a fixed wing aircraft (12) having a power plant or gas turbine engine (18) driving a number of outboard propulsion units (20) mounting to pylons (24) extending laterally outwardly from the fuselage of the aircraft and propelling the fixed-wing aircraft via mechanical transmission (28).
Abstract: An aircraft propulsion system (10) or a fixed wing aircraft (12) having a power plant or gas turbine engine (18) driving a number of outboard propulsion units (20) mounting to pylons (24) extending laterally outwardly from the fuselage (14) of the aircraft and propelling the fixed wing aircraft (12) via mechanical transmission (28). The propulsion units (20) are powered by the gas turbine engine (18) independently from one another to permit selective shutdown of at least one of the propulsion units (20) while still allowing the remaining propulsion units (20) to be driven by the engine (18). The mechanical transmission (28) is a multibranch transmission wherein an overload decoupling device (48) is provided in each transmission shaft branch (30) set to automatically disconnect an associated propulsion unit (20) when a predetermined critical value is reached. Both the propulsion units (20) and the gas turbine engine (18) having lubrication systems (50, 54) to lubricate transmission components and the decoupling devices (48).
47 citations