منابع مشابه
Dynamic Model for Thrust Generation of Marine Propellers
Mathematical models of propeller thrust and torque are traditionally based on steady state thrust and torque characteristics obtained in model basin or cavitation tunnel tests. Experimental results showed that these quasi steady state models do not accurately describe the transient phenomena in a thruster. A recently published dynamic model was based on the experimental observations. Describing...
متن کاملA Four-Quadrant Thrust Controller for Marine Propellers with Loss Estimation and Anti-Spin
In this paper a nonlinear thrust controller for a fixed pitch marine propeller with torque loss estimation and an anti-spin strategy is presented. The controller, designed to work in the four-quadrant plane composed by the shaft speed and the vessel speed, is a combination of a thrust controller designed for calm sea conditions and an anti-spin strategy to reduce power peaks and wear-and-tear i...
متن کاملDevelopment of Orifice-type Aerostatic Thrust Bearing for Precision Machine
Air bearings are used in precision machines and measurement equipments for recently years. Unlike conventional ball or roll bearings, there is no physical contact between the sliding surfaces and the moving surface. Therefore, the structure with air bearings can glide smoothly on the other surface to avoid generating the small particles from the friction contact and also minimize the control ef...
متن کاملNote: Radial-thrust combo metal mesh foil bearing for microturbomachinery.
This Note proposes a novel radial-thrust combo metal mesh foil bearing (MMFB). Although MMFBs have advantages such as higher stiffness and damping over conventional air foil bearings, studies related to MMFBs have been limited to radial MMFBs. The novel combo MMFB is composed of a radial top foil, thrust top foils, and a ring-shaped metal mesh damper--fabricated by compressing a copper wire mes...
متن کاملThrust Estimation and Control of Marine Propellers in Four- Quadrant Operations
Speed and position control systems for marine vehicles have been subject to an increased focus with respect to performance and safety. An example is represented by drilling operations performed with semi submersible rigs where the control of position and heading requires high accuracy. Drifting from the well position could cause severe damage to equipment and environment. Also, the use of under...
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ژورنال
عنوان ژورنال: Journal of the Franklin Institute
سال: 1858
ISSN: 0016-0032
DOI: 10.1016/0016-0032(58)90053-x