scholarly journals Effective simple methods for numerical modelling of marine engines in ship propulsion control systems design

2011 ◽  
Vol 8 (2) ◽  
pp. 129-147 ◽  
Author(s):  
M. Altosole ◽  
Massimo Figari
Keyword(s):  
Control Systems ◽  
Gas Turbine ◽  
Naval Architecture ◽  
Detailed Model ◽  
Ship Propulsion ◽  
Control Schemes ◽  
Marine Engines ◽  
Propulsion Control ◽  
Marine Engineering ◽  
Engine Power

In the last year, the Department of Naval Architecture and Marine Engineering of Genoa University (now Department of Naval Architecture, Marine Technology and Electrical Engineering) collaborated to the design of the propulsion automation of two different naval vessels; within these projects the authors developed different ship propulsion simulators used to design and test the propulsion control schemes. In these time-domain simulators, each propulsion component is represented by a specific mathematical model, mainly based on algebraic and differential equations. One of the key aspects of the propulsion simulation is the engine dynamics. This problem in principle can be dealt with models based on thermodynamic principles, which are able to represent in detail the behaviour of many variables of interest (engine power and speed, air and gas pressures, temperatures, stresses, etc.). However, thermodynamic models are often characterized by a long computation-time and moreover their development usually requires the knowledge of specific engine information not always available. It is generally preferable to adopt simpler simulation models, for the development of which, very few kinds of information are necessary. In fact, for the rapid prototyping of control schemes, it is generally more important to model the whole plant (in a relatively coarse way) rather than the detailed model of some components. This paper deals with simple mathematical methods, able to represent the engine power or torque only, but they can be suitably applied to many types of marine engines in a straightforward way. The proposed simulation approaches derived from the authors’ experience, gained during their activity in the marine simulation field, and they are particularly suitable for a fast prototyping of the marine propulsion control systems. The validation process of these particular models, regarding a Diesel engine, a marine gas turbine and an electric motor, is illustrated based on the sea trials data and engine manufacturers’ data. Keywords: Dynamic simulation; marine engines performance; gas turbine; propulsion control. doi: http://dx.doi.org/10.3329/jname.v8i2.7366   Journal of Naval Architecture and Marine Engineering 8(2011) 129-147

Adaptive Model Based Control of Aircraft Propulsion Systems: Status and Outlook for Naval Aviation Applications

2006 ◽  
Author(s):  
James W. Fuller ◽  
Aditya Kumar ◽  
Richard C. Millar
Keyword(s):  
Control Systems ◽  
Gas Turbine ◽  
Multiple Goals ◽  
Military Aircraft ◽  
Propulsion Systems ◽  
Model Based Control ◽  
Aircraft Systems ◽  
Model Based ◽  
Propulsion Control ◽  
Aircraft Propulsion

The control of military aircraft propulsion and associated aircraft systems continue to become more demanding, in response to the operational needs of new and existing aircraft and missions. High performance aircraft operate in multiple modes. They are complex and require complex propulsion systems that provide precise and repeatable performance: safely, dependably, and cost effectively. To support these requirements, propulsion control systems must manage multiple effectors based on multiple operating parameters through interactive processes. The scopes of control extends beyond the gas turbine engine to the inlet, exhaust, power and bleed extraction, electrical power systems, thermal & environmental management, fuel systems, starting, accessories, and often propellers, rotors or lift fans. Modern propulsion control systems are increasingly integrated with the aircraft flight controls and the distinction is becoming less & less meaningful. Within the gas turbine, variable geometry and active control of turbo-machinery and auxiliary systems proliferate to relax mechanical design constraints and enable designs with increased thrust to weight ratios, reduced fuel burn and increased durability. Digital controls provide crisp and repeatable responses and improve aircraft reliability and availability, but further enhancements are needed as military aircraft become more capable and versatile (e.g., V-22 and F35). The control system must be aware and appropriately respond to component degradation and damage, optimally managing conflicting constraints and goals. Modern propulsion systems are becoming more profoundly multivariable and include multiple effectors to meet multiple goals. They are multivariable because they are cross-coupled, where each effector can affect multiple goals. In addition, these multiple goals, (e.g., performance, life, operating margin) may be conflicting and need to be traded off, and the best trade off will vary with mission. With predictable and rapid increases in computational capability in Full Authority Digital Electronic Controls, the industry is moving forward to address these needs through model based control, control that manages propulsion and aircraft systems with optimal control responses derived from detailed real time models of component behavior. Since the component characteristics change significantly during a service interval, and yet longer time on wing is necessary, these control systems must sense degradation and damage to multiple components and adapt to it. This paper describes current approaches and NAVAIR plans to develop, mature and deploy this technology, while touching on other potential applications.

Tanker Fleet Upgrade: Gas Turbine and Propulsion Control Systems Retrofit

1995 ◽  
Author(s):  
Stephen Kemp ◽  
Marc Cozzetta ◽  
Scott Harclerode
Keyword(s):  
Control Systems ◽  
Gas Turbine ◽  
Gas Turbines ◽  
First Generation ◽  
Coast Guard ◽  
Fuel Savings ◽  
Digital Control Systems ◽  
Propulsion Control ◽  
Control Circuits ◽  
Oil Tanker

Many gas turbines commissioned in the late 1960’s and early 1970’s employ “first generation” electronic control systems. Usually a combination of analog-digital fuel and temperature control circuits and electromechanical relay sequencers, these systems (and the gas turbines they were designed to control) inevitably experience diminished performance as they age. This paper describes the project to design, construct, install, and commission replacements for the control systems on the main and auxiliary gas turbines and the propulsion controls for Chevron Shipping Company’s domestic tanker fleet. Since replacing the main gas turbine control system and propulsion controls on the oil tanker Chevron Colorado in the spring of 1993, both the main and auxiliary turbine and propulsion controls have been replaced on each of the other four (4) tankers. Triple modular redundant (TMR) digital systems were selected 10 replace the original analog-digital control systems on the main and auxiliary gas turbines (MGT & AGT). Required American Bureau of Shipping and US Coast Guard certification tests, as well as dock and sea trials for the new control systems are discussed. Economic results including maintenance repair action rates, start percentages, availabilities, and fuel savings are detailed.

Development of a PLC Based Controller for Marine Gas Turbine Generator

2011 ◽  
Author(s):  
Amrut Dilip Godbole ◽  
Ankush Gulati ◽  
Alok Bhagwat
Keyword(s):  
Control System ◽  
Control Systems ◽  
Gas Turbine ◽  
Low Cost ◽  
Turbine Generator ◽  
Engineering Technology ◽  
Marine Engineering

The advent of processor based controllers including the PLC has provided a low cost alternative for up gradation of control systems when faced with the challenges of maintenance and obsolescence. A project was undertaken at the Centre of Marine Engineering Technology of the Indian Navy to design, develop and test a PLC based controller for a Gas Turbine Generator as an alternative to the legacy relay logic based control system. The paper explains the methodology adopted towards the various stages of the development of the PLC based controller using Commercially-Off-The-Shelf (COTS) items. It also brings out the salient advantages offered as a result of this transformation.

scholarly journals The Increased Use of Gas Turbines as Commercial Marine Engines

1993 ◽  
Author(s):  
C. O. Brady ◽  
D. L. Luck
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Gas Turbine Engine ◽  
Turbine Engine ◽  
Ship Propulsion ◽  
Naval Ship ◽  
Marine Engines ◽  
Marine Applications

Over the last three decades, aeroderivative gas turbines have become established naval ship propulsion engines but use in the commercial marine field has been more limited. Today, aeroderivative gas turbines are being increasingly utilized as commercial marine engines. The primary reasons for the increased use of gas turbines is discussed and several recent GE aeroderivative gas turbine commercial marine applications are described with particular aspects of the gas turbine engine installations detailed. Finally, the potential for future commercial marine aeroderivative gas turbine applications is presented.

The Increased Use of Gas Turbines as Commercial Marine Engines

1994 ◽  
Vol 116 (2) ◽  
pp. 428-433 ◽  
Author(s):  
C. O. Brady ◽  
D. L. Luck
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Gas Turbine Engine ◽  
Primary Reason ◽  
Turbine Engine ◽  
Ship Propulsion ◽  
Naval Ship ◽  
Marine Engines ◽  
Marine Applications

Over the last three decades, aeroderivative gas turbines have become established naval ship propulsion engines, but use in the commercial marine field has been more limited. Today, aeroderivative gas turbines are being increasingly utilized as commercial marine engines. The primary reason for the increased use of gas turbines is discussed and several recent GE aeroderivative gas turbine commercial marine applications are described with particular aspects of the gas turbine engine installations detailed. Finally, the potential for future commercial marine aeroderivative gas turbine applications is presented.

LV100 AIPS Technology—For Future Army Propulsion

1992 ◽  
Author(s):  
Walter Brockett ◽  
Angelo Koschier
Keyword(s):  
Control Systems ◽  
Gas Turbine ◽  
Fuel Consumption ◽  
Cooling System ◽  
Gas Turbine Engine ◽  
Air Filtration ◽  
Turbine Engine ◽  
Overall Design ◽  
Armored Vehicle ◽  
And Control

The overall design of and Advanced Integrated Propulsion System (AIPS), powered by an LV100 gas turbine engine, is presented along with major test accomplishments. AIPS was a demonstrator program that included design, fabrication, and test of an advanced rear drive powerpack for application in a future heavy armored vehicle (54.4 tonnes gross weight). The AIPS design achieved significant improvements in volume, performance, fuel consumption, reliability/durability, weight and signature reduction. Major components of AIPS included the recuperated LV100 turbine engine, a hydrokinetic transmission, final drives, self-cleaning air filtration (SCAF), cooling system, signature reduction systems, electrical and hydraulic components, and control systems with diagnostics/prognostics and maintainability features.

scholarly journals Hybrid Data-Driven and Physics-Based Modeling for Gas Turbine Prescriptive Analytics

2020 ◽  
Vol 5 (4) ◽  
pp. 29
Author(s):  
Sergei Belov ◽  
Sergei Nikolaev ◽  
Ighor Uzhinsky
Keyword(s):  
Gas Turbine ◽  
Data Driven ◽  
Machine Learning Techniques ◽  
Flame Tube ◽  
Learning Techniques ◽  
Prescriptive Analytics ◽  
Hybrid Data ◽  
Data Driven Modeling ◽  
Engine Power

This paper presents a methodology for predictive and prescriptive analytics of a gas turbine. The methodology is based on a combination of physics-based and data-driven modeling using machine learning techniques. Combining these approaches results in a set of reliable, fast, and continuously updating models for prescriptive analytics. The methodology is demonstrated with a case study of a jet-engine power plant preventive maintenance and diagnosis of its flame tube. The developed approach allows not just to analyze and predict some problems in the combustion chamber, but also to identify a particular flame tube to be repaired or replaced and plan maintenance actions in advance.

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