Elements of systems engineering of digital control

1995 ◽  
pp. 23-45
Author(s):  
L. C. Westphal
Keyword(s):  
Systems Engineering ◽  
Digital Control

Integrated Testing of the Full Authority Digital Control (FADC) for the U.S. Navy’s CG-47 Class Ship Service Gas Turbine Generator (SSGTG) Sets

2002 ◽  
Author(s):  
Brian J. Connery ◽  
Dennis M. Russom ◽  
Ivan Pineiro
Keyword(s):  
Gas Turbine ◽  
Systems Engineering ◽  
Digital Control ◽  
Development Program ◽  
Test Site ◽  
Turbine Generator ◽  
Design Work ◽  
Short Period ◽  
Work Done ◽  
The U.S

Naval Surface Warfare Center, Carderock Division - Ship Systems Engineering Station (NSWCCD-SSES) successfully completed testing of a new Full Authority Digital Control (FADC) system for gas turbine control. This system will be back-fit onto Model 139 Ship Service Gas Turbine Generator Sets (SSGTGs) on the U.S. Navy’s Ticonderoga (CG-47) class cruisers. The FADC will be a direct replacement of the original Model 139 Local Operating Panel (LOCOP) and will control the Allison 501-K17 gas turbine. The new control system provides for standardized installation across a wide variety of existing configurations. The development program leveraged off of the design work done for the AG9140 FADC currently being installed on DDG 51 Class ships. The result was a state-of-the-art system ready for shipboard installation in a short period of time, providing commonality of look and feel across platforms. This paper describes the CG-47 FADC and details the development and testing conducted on a Model 139 SSGTG at the NSWCCD-SSES DDG 51 Gas Turbine Land Based Engineering Test Site (LBES). The test program included all modes of SSGTG operation, including starts, shutdowns, and generator operations under varying load conditions.

Simulation and Experimental Investigations of a Digital High Speed Close Loop Proportional Directional Valve Using a Solenoid Technology

2016 ◽  
Author(s):  
Dario Buono ◽  
Adolfo Senatore ◽  
Emma Frosina ◽  
Wade Gehlhoff ◽  
Ina I. Costin
Keyword(s):  
Mathematical Model ◽  
Systems Engineering ◽  
Digital Control ◽  
High Speed ◽  
Dynamic Performance ◽  
Simulation Models ◽  
Experimental Tests ◽  
Experimental Investigations ◽  
Proportional Valve ◽  
Modeling Technology

This paper describes the design, simulation and testing of a high response servo-proportional valve. The purpose of this work is to study the possibilities, using a modeling technology, to increase the dynamic performance of a servo-proportional directional developing new algorithms for the digital control system. The development of digital technology, introduced also in the control of proportional valves, have led to the reduction of the differences between the overall characteristics of proportional and servo valves so that the proportional ones can be a suitable solution in many applications, where servo-valves are traditionally used. The mathematical model of the servo-proportional valve has been developed by using the commercial software AMESim® (Advanced Modeling and Simulation Environment for Systems Engineering). The model includes the proportional solenoid and the linear transducer. Digital control of the proportional valve proposed in this paper, is a key part of this research. Its mathematical model and the control algorithm have been built using Matlab®. Both models have been run in co-simulation to improve the overall valve performance. The experimental tests have been performed in the labs of Duplomatic Oleodinamica SpA and Continental Hydraulic Inc. The data have been used to validate the simulation models.

Integrated Testing of the Full Authority Digital Control and Redundant Independent Mechanical Start System for the U.S. Navy’s DDG-51 Ship Service Gas Turbine Generator Sets

1998 ◽  
Author(s):  
Helen J. Kozuhowski ◽  
Matthew G. Hoffman ◽  
C. David Mako ◽  
Leonard L. Overton ◽  
William E. Masincup
Keyword(s):  
Control System ◽  
Gas Turbine ◽  
Phase Ii ◽  
Systems Engineering ◽  
Digital Control ◽  
Primary Objective ◽  
Integrated System ◽  
Turbine Generators ◽  
Plant Operations ◽  
The U.S

The U.S. Navy and Allison Engine Company successfully completed a second round of testing which integrated a new Woodward Governor Full Authority Digital Control (FADC) system for gas turbine control and a Redundant Independent Mechanical Start System (RIMSS). This integrated system will be installed on Allison Model AG9140 Ship Service Gas Turbine Generators (SSGTGs) on hull numbers DDG-86 and follow of the U.S. Navy’s Arleigh Burke (DDG-51) class destroyers. The Full Authority Digital Control (FADC) Local Operating Panel (LOCOP) will be a direct replacement of the original AG9140 LOCOP and will control both the Allison 501-K34 gas turbine and the RIMSS unit. RIMSS is a gas turbine powered, mechanically coupled start system for the SSGTGs and is designed to replace the high pressure start air system on DDG-51 class ships. This paper describes the FADC and RIMSS systems and details Phase II testing that was conducted on the AG9140 SSGTG located at the Naval Surface Warfare Center, Carderock Division - Ship Systems Engineering Station (NSWCCD-SSES) DDG-51 Land Based Engineering Site (LBES), Figure 1. The test program embodied the second portion of RIMSS testing which included the addition of the final prototype FADC control system. The test agenda included electric plant operations with the FADC and a second 500 start endurance test of RIMSS. The primary objective of Phase II testing was to evaluate the FADC control system and to further validate engine life predictions for the RIMSS engine.

Abstraction: An alternative neurocognitive account of recognition, prediction, and decision making

2020 ◽  
Vol 43 ◽  
Author(s):  
Valerie F. Reyna ◽  
David A. Broniatowski
Keyword(s):  
Decision Making ◽  
Software Engineering ◽  
Systems Engineering ◽  
Evidence Based ◽  
Extensive Literature ◽  
Trace Theory ◽  
Fuzzy Trace Theory ◽  
Abstract Representations ◽  
Technical Systems

Abstract Gilead et al. offer a thoughtful and much-needed treatment of abstraction. However, it fails to build on an extensive literature on abstraction, representational diversity, neurocognition, and psychopathology that provides important constraints and alternative evidence-based conceptions. We draw on conceptions in software engineering, socio-technical systems engineering, and a neurocognitive theory with abstract representations of gist at its core, fuzzy-trace theory.

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