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•
20 Oct 2004
TL;DR: In this article, a marine vessel running controlling apparatus consists of a pair of propulsion systems which respectively generate propulsive forces on a rear port side and a rear starboard side of a hull, and a steering mechanism which respectively change steering angles defined by directions of the propulsion forces with respect to the hull, such that a turning angular speed of the hull is substantially equal to a predetermined target angular speed.
Abstract: A marine vessel running controlling apparatus controls running of a marine vessel and includes a pair of propulsion systems which respectively generate propulsive forces on a rear port side and a rear starboard side of a hull, and a pair of steering mechanisms which respectively change steering angles defined by directions of the propulsive forces with respect to the hull. The apparatus includes a target combined propulsive force acquiring section, a target movement angle acquiring section, a steering controlling section which controls the steering angles of the respective steering mechanisms such that a turning angular speed of the hull is substantially equal to a predetermined target angular speed, a target propulsive force calculating section which calculates target propulsive forces to be generated from the respective propulsion systems based on the target combined propulsive force, the target movement angle and the steering angles of the respective steering mechanisms, and a propulsive force controlling section which controls the respective propulsion systems so as to attain the target propulsive forces.
80 citations
Patent•
02 Aug 2012
TL;DR: In specific embodiments, a vehicle propellable through fluids or along surfaces, comprises a main work section and a plurality of propulsion units for propelling the main work sections as discussed by the authors. But the propulsion units each include a rotor system and a ring-shaped wheel at least partially arranged about the rotor system.
Abstract: In specific embodiments, a vehicle propellable through fluids or along surfaces, comprises a main work section and a plurality of propulsion units for propelling the main work section. The main work section supports one or more payloads. The propulsion units each include a rotor system and a ring-shaped wheel at least partially arranged about the rotor system and rotatable about the rotor system. The ring-shaped wheel is arranged at a banked angle relative to the rotor system.
80 citations
TL;DR: The first solid propulsion roadmap for space applications was published in 2000 by Davenas et al. as discussed by the authors, and subsequent information supports its enabling technologies (high strength composite cases, energetic material processing based on continuous mixing, low density insulation, reduced actuator energy requirements, and advanced detailed simulations).
80 citations
TL;DR: A summary of recent 870lbf thrust LOX/LCH 4 (liquid oxygen/liquid methane) engine test results and recent LOX / LCH 4 torch igniter testing is presented in this paper.
80 citations
TL;DR: More electric architectures for aircraft, spacecraft, and military ground vehicles have been studied in this paper, showing that substantial demand has arisen for improved electric power-generation performance in the commercial aircraft business.
Abstract: The electric machines (EMs) for high-performance electrical power-generation systems (EPGSs) play a significant role in the modern aerospace and military industries. This is particularly true in the area of More Electric Architecture (MEA) for aircraft, spacecraft, and military ground vehicles. The commercial aircraft business is moving toward no-bleed air environmental control systems, variable-frequency and dc power-distribution buses, and electrical actuation. A typical example is the Boeing 787 platform. The next-generation Boeing narrow-body airplane (the replacement for the 737) and the Airbus replacement for the A320 will most likely use MEA. Some ?military ?aircraft already use MEA for both primary and secondary flight control. Military ground vehicles have migrated toward hybrid electric technology. In those cases, the main propulsion is performed by electric drives. This demonstrates that substantial demand has arisen for improved electric power-generation performance. Future space vehicles will require electric drives for thrust-vector and flight-control actuation, demanding more high-quality electric power. These systems must be more robust and will offer greatly reduced operating costs and improved safety compared with Space Shuttle hardware.
80 citations