Propulsion System Design for the Multi-Mission Patrol Ship Mark 1/1A

1978 ◽  
Author(s):  
L. E. Bronson ◽  
R. M. Prentice
Keyword(s):  
System Design ◽  
Gas Turbines ◽  
High Speed ◽  
Propulsion System ◽  
Two Stage ◽  
Low Speed ◽  
Made In

PSMM Mkl/1A is a high-speed patrol ship designed to accomplish a variety of missions. It is a 165-ft aluminum hull powered by six gas turbines driving two controllable reversible pitch propellers. Two-stage combining reduction gears with self-synchronizing clutches enable the ship to operate at speeds to 40 knots on from one to six turbines. Controllable pitch propellers are used to optimize operations in high- or low-speed maneuvers. The propulsion system is controlled by a pair of analog computers which automatically select shaft rpm and propellers pitch based on power command and the number of turbines operating. This paper will discuss the propulsion system and controls as designed, the modifications made during trials of the Mk1 in late 1974, and the improvements made in the Mk 1A and proved during trials in 1977.

scholarly journals Propulsion System Design For The Indonesian Semi High Speed Train

2020 ◽  
Vol 13 (3) ◽  
pp. 215-222
Author(s):  
Lukman Shalahuddin ◽  
Kartiko E. Putranto ◽  
Dimas B. Eskayudha
Keyword(s):  
Diesel Engine ◽  
System Design ◽  
Optimum Design ◽  
High Speed ◽  
Appropriate Technology ◽  
Propulsion System ◽  
High Speed Train ◽  
Battery System ◽  
Multiple Unit ◽  
Main Components

This paper describes a study on the development of methodology to select the most appropriate technology, and the most optimum design and configuration for the propulsion system of the semi-high speed intercity train that will be operated on the Jakarta-Surabaya corridor. It also describes the method to calculate resistance loads  and tractive forces and hence the power required to propel the train along the specified route within targeted time. Among the output of this study is a recommendation for the most optimum propulsion system with basic/ main parameters for main components such as diesel engine, traction motor and the possibility of Diesel Electric Multiple Unit (DEMU) Hybrid battery system.

scholarly journals A 21st Century Warship With a 21st Century Propulsion System

1998 ◽  
Author(s):  
Mark Carter ◽  
Magnus Olsson ◽  
Jan-Erik Gustavson ◽  
Joe Ranero
Keyword(s):  
21St Century ◽  
Diesel Engines ◽  
High Speed ◽  
Propulsion System ◽  
Design Features ◽  
Signal Model ◽  
Turbine Engine ◽  
Low Speed

The Visby Class Corvette will enjoy the advantages of a Combined Diesel or Gas (CODOG) turbine arrangement in which the diesel engines are used for low-speed mine hunting and ASW missions, while the four turbines can be operated either individually or in pairs to provide cruise or high-speed dash capability. The integration of these features into a single gearbox, the design of the Allied Signal model TF50A turbine engine, and the integration of the CODOG system into the ship is discussed herein. Attention is focused on the unique design features which provide the “stealth” capabilities of this ship.

Design of a Multijet Omnidirectional Propulsion System for Small Jet-Boats

2010 ◽  
Vol 132 (11) ◽  
Author(s):  
David Foley ◽  
Jean-Sebastien Plante
Keyword(s):  
High Speed ◽  
Flow Model ◽  
Open Loop ◽  
Propulsion System ◽  
Experimental Results ◽  
Control Algorithms ◽  
Control Laws ◽  
Low Speed ◽  
Advanced Control ◽  
Design Requirements

Jet-boats perform remarkably well at high-speed but lack low speed maneuverability for tight maneuvers such as docking. This paper presents a joystick controlled omnidirectional propulsion system for jet-boats. The concept uses a set of fixed jet nozzles disposed around the hull. When a force is commanded by the joystick, valves on each nozzle modulate the flow so that the sum of nozzle thrusts correspond to the commanded force. The positions and angles of the nozzles are optimized with an index of omnidirectionality quality based on the projection of a set of force solutions on a shell with the shape of a desired force space. The choice of valve positions and engine speeds is done by the numerical inversion of an internal viscous flow model. A 3D simulator, backed by experimental results, serves to (1) evaluate the ability of the proposed concept in meeting its design requirements and (2) develop control algorithms. Experimental results show that the proposed omnidirectional system is effective for low speed maneuverability with open-loop force control. The present work also offers an effective omnidirectional propulsion system that is easy to enhance with advanced control laws. Velocity feedback control is given as an example and shows important improvement of maneuverability and robustness to miscalibration.

Design Considerations and Validation of Trailing Edge Pressure Side Bleed Cooling

2009 ◽  
Author(s):  
Joerg Krueckels ◽  
Michael Gritsch ◽  
Martin Schnieder
Keyword(s):  
Gas Turbines ◽  
High Speed ◽  
Thickness Effect ◽  
Design Parameters ◽  
Pressure Side ◽  
Trailing Edge ◽  
Low Speed ◽  
Final Design ◽  
Overhang Length ◽  
Important Design

One important design measure, which allows achieving a higher efficiency in heavy-duty gas turbines, is reducing the trailing edge thickness of the turbine vanes and blades. A common approach to achieve an efficient cooling of thin trailing edges is pressure side coolant ejection. As the trailing edge is one of the areas of the vanes and blades with the highest heat load, a careful design and validation approach is required. First, the most important design parameters were identified for the design of pressure side bleed. In the present investigation, focus is given to the blockage of the internal features, slot width, overhang length, pressure side lip thickness, effect of rotation and blowing rate. Flat plate test results from a low speed rig are used to choose suitable parameters, which fulfill requirements of a specific design. Previous investigations have shown that contrary to CFD using steady RaNS, unsteady detached eddy simulations can predict film effectiveness of pressure side bleed with good accuracy. Therefore, this approach is used to complete experimental data. The effect of going from low speed rig conditions to engine conditions is modeled with this approach. The final design is investigated in a high-speed cascade rig. Film effectiveness is measured using thermocromic liquid crystals. The cascade results confirm results from the low speed rig. High levels of film effectiveness allow effective cooling of the trailing edge overhang.

scholarly journals Engineering Considerations of Gas Turbine/Waterjet Marine Propulsion Systems

1993 ◽  
Author(s):  
Paul Martin ◽  
Donald L. Blount
Keyword(s):  
Gas Turbines ◽  
High Speed ◽  
Propulsion System ◽  
Sea State ◽  
Blue Ribbon ◽  
Marine Propulsion ◽  
Technical Assessment ◽  
Reverse Thrust ◽  
Marine Vessels

The installation of gas turbines in high-speed marine vessels is relatively new in the merchant marine sector. The main objective of this paper is to present the engineering considerations that were taken into account during the design, testing and classification of the propulsion machinery of DESTRIERO, a high-speed, aluminum hull craft. This Blue Ribbon record-holding vessel will be the basis for, the discussion which will highlight the value of a detailed technical assessment of a vessel’s propulsion system early in the design process. The DESTRIERO is a 67.7 meter aluminum monohull designed to cross the Atlantic ocean without refueling at a speed in excess of 50 knots in a sea state 4. During trial runs the vessel exceeded 65 knots. In August 1992 during its eastbound transit, the vessel earned the current non-stop Atlantic crossing speed record of 53.09 knots. The propulsion system is provided by three General Electric (GE) LM1600 gas turbines, each developing 20,740 IGHP (ISO base rating). The gas turbines drive three KaMeWa waterjets through a Renk Tacke reduction gearbox. Reverse thrust and steering are accomplished through the two outer jets. Each turbine and its auxiliaries are packaged in MTU modules, which are flexibly mounted to the ship’s structure.

Low Speed Balancing for Supercritical Shafting in Gas Turbines

2008 ◽  
Author(s):  
Peter D. Hylton
Keyword(s):  
Gas Turbines ◽  
High Speed ◽  
Power Plants ◽  
Analytical Modeling ◽  
Manufacturing Processes ◽  
Advanced Manufacturing ◽  
Commercial Aircraft ◽  
Modeling And Analysis ◽  
Low Speed ◽  
Shaft System

Gas turbines are used for power generation with units in a range of sizes. They serve as power plants for both military and commercial aircraft. Demand is for faster, lighter engines, utilizing more advanced manufacturing processes. One of the means of meeting this goal is through use of longer, thinner, more flexible shafts which operate supercritically. Supercritical operation was once viewed as impractical, however, a number of today’s production gas turbines operate in this mode. The shaft manufacturing process is optimal if the shaft balance procedure can be conducted at low speeds, rather than requiring a more expensive and complicated high speed balance process. The objective of the project described in this paper is to develop a systematic process for a low speed balance procedure, which, in conjunction with appropriate damping, would permit a high speed shaft system to transition through additional critical speeds and operate safely above them. The discussion includes research on analytical modeling and analysis of representative shaft systems to determine the optimum locations of the balance planes and outlines an analysis approach for predicting shaft responses.

Hidden Advantages and Strategic Leaps for CODAG, CODELAG, CODELOG and Hybrid Propulsion Systems

2020 ◽  
Author(s):  
Morgan L. Hendry ◽  
Nicholas Bellamy
Keyword(s):  
Gas Turbines ◽  
Electric Propulsion ◽  
High Speed ◽  
Plant Design ◽  
Propulsion Systems ◽  
Hybrid Propulsion ◽  
Low Speed ◽  
Depth Analysis ◽  
Us Navy ◽  
Mean Time

Abstract Navies worldwide are increasingly considering and adopting propulsion plants with electric propulsion for cruise and ship silent operation, and gas turbines for boost propulsion for high speed. These propulsion plants, often referred to as hybrid propulsion, utilize water jets, controllable pitch propellers, or fixed pitch propellers, and have design and overall configuration to fit into naval ships with various size hulls such as would be the case with corvettes, frigates, destroyers, cruisers, etc. Therefore, size, weight, and space of the propulsion plant is important, but equally important is limiting associated machinery which must be used with a particular hybrid propulsion plant design selected. In addition, propulsion design engineers, in conjunction with naval architects, shipyards and navies, must consider fuel efficiencies, machinery efficiencies, weight of all the associated machinery, placement in the hull, first time cost, and life cycle maintenance with associated cost when selecting the configuration of the propulsion system’s associated machinery. Manning levels are dictated by these parameters and in the end, it must be realized that the purpose of the ship mission can be compromised if reliability is not high and premature failures occur. This paper is a more in depth analysis of hybrid propulsion systems for naval ships of various sizes, and analysis of the associate machinery emphasizing ship weight and space savings, fuel savings, cost savings, mean time between failures and mean time to repair which results in lower manning requirements and increased mission readiness. By the time this paper is published, more than 250 SSS Clutches will be installed in US Navy Arleigh Burke Destroyers, 32 are operating in low speed propeller shafts of British Navy Type 23 ships, 2 in the Japanese Navy’s Asuka Class and 16 in low speed propeller shafts of Royal Korean Navy FFX Batch II frigates. At the time of abstract submission, all three programs referenced above have cumulatively had zero defects attributable to SSS Clutch material, function, design, or quality. While the US Navy are given occasional reminders of why alternative clutch designs remain ineffective, unreliable and remarkedly inefficient, other nations’ vertically tiered supply chains and inexperienced engineers are shielded from similar issues.

Miller Cycle-Regulatable Two Stage Turbocharging System Design of Marine Diesel Engines

2012 ◽  
Author(s):  
Yi Cui ◽  
Zhilong Hu ◽  
Kangyao Deng ◽  
Qifu Wang
Keyword(s):  
Simulation Model ◽  
System Design ◽  
High Speed ◽  
Combustion Model ◽  
Nox Emissions ◽  
Miller Cycle ◽  
Two Stage ◽  
Cycle Simulation ◽  
Turbocharging System ◽  
Marine Diesel

Satisfying the coming International Marine Organization (IMO) NOx emissions requirements and regulations is the main focus of attention in marine engine design. Miller cycle, which reduces in-cylinder combustion temperature by reducing effective compression ratio, is the main measure to reduce NOx specific emissions on the cost of volumetric efficiency and engine power. Therefore, it is essential to combine Miller cycle with highly boosted turbocharging system, for example, two stage turbocharing, to recover the power. In this paper, different two stage turbocharging system scenarios are introduced and compared. The system design and matching process is presented. A multi-zone combustion model based one dimensional cycle simulation model is established. The intake valve closure timing and the intake exhaust valves overlap duration are optimized according to the IMO NOx emission limits by the simulation model. The high and low stage turbochargers are selected by an iterative matching method. Then the control strategies of the boost air and the high stage turbine bypass valves are also studied. As an example, a Miller cycle-regulatable two stage turbocharging system is designed for a type of highly boosted high speed marine diesel engine. The results show that the NOx emissions can be reduced 30% and break specific fuel consumption can also be improved by means of moderate Miller cycle combined with regulatable two stage turbocharing.

Application and Experience of the SSS (Synchro-Self-Shifting) Clutch for High Speed Gas Turbine Marine Propulsion Systems

2018 ◽  
Author(s):  
Morgan L. Hendry
Keyword(s):  
System Design ◽  
Gas Turbine ◽  
Gas Turbines ◽  
High Speed ◽  
Propulsion Systems ◽  
Advantages And Disadvantages ◽  
Marine Propulsion ◽  
History Of ◽  
System Configurations ◽  
Design Challenges

Synchro-Self-Shifting (SSS) Overrunning Clutches are used in a myriad of propulsion system configurations for naval and commercial vessels powered by gas turbines and/or combined gas turbine and cruise engines worldwide. Of these, much has been written about high power gas turbine propulsion clutches for large naval vessels (frigates, destroyers, cruisers, etc.), whereas less has been published about the application and experience of the propulsion machinery with Synchro-Self-Shifting Clutches for hydrofoils, hovercraft, fast patrol boats, fast ferries, yachts, etc. Space, weight, and high-speed constraints can be different for high speed gas turbine propulsion systems used in these smaller types of vessels, and can therefore provide gearing challenges, including system design challenges for these clutches. A comparison between Synchro-Self-Shifting overrunning clutches and other types of freewheels will be given discussing the advantages and disadvantages of each, particularly as they relate to high speed gas turbine marine propulsion applications. Lastly, this paper will give some history of a number of high speed gas turbine driven marine propulsion applications with clutches from the early 1960’s until the present, describe various gearing arrangements that were used in particular vessels, articulate where these clutches are incorporated, and discuss the application experience of these clutch installations.

Do You Name Speedy Objects Faster Than Slow Objects: SPEEDED NAMING OR NAMING SPEED? THE AUTOMATIC EFFECT OF OBJECT SPEED ON PERFORMANCE

2018 ◽  
Author(s):  
Moshe Shay Ben-Haim ◽  
Eran Chajut ◽  
Ran Hassin ◽  
Daniel Algom
Keyword(s):  
High Speed ◽  
Mental Representations ◽  
Reading Aloud ◽  
Naming Task ◽  
Naming Speed ◽  
Low Speed ◽  
Everyday Objects ◽  
Pictures And Words

we test the hypothesis that naming an object depicted in a picture, and reading aloud an object’s name, are affected by the object’s speed. We contend that the mental representations of everyday objects and situations include their speed, and that the latter influences behavior in instantaneous and systematic ways. An important corollary is that high-speed objects are named faster than low-speed objects despite the fact that object speed is irrelevant to the naming task at hand. The results of a series of 7 studies with pictures and words support these predictions.

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