Systems-Theoretic Accident Model and Processes (STAMP) Applied to a U.S. Coast Guard Buoy Tender Integrated Control System

Systems-Theoretic Accident Model and Processes (STAMP) Applied to a U.S. Coast Guard Buoy Tender Integrated Control System
Author: Paul D. Stukus
Publisher:
Total Pages: 132
Release: 2017
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The Systems-Theoretic Accident Model (STAMP) developed by MIT's Dr. Nancy Leveson was applied in this thesis to a ship navigation control system used on U.S. Coast Guard buoy tenders. The legacy system installed on the Service's 16 sea-going buoy tenders experienced numerous incidents that had potential to be hazardous to the ships and their crews. Faced with the dual needs of ensuring safety of mission execution and restoring confidence in the overall ship control system, yet faced with a limited budget, Coast Guard decision-makers elected to conduct a partial recapitalization of the system's hardware and software. This thesis explores the application of system safety methods to analyze the legacy system on the seagoing buoy tenders. An accident analysis of a particular incident was conducted using STAMP methodologies, and its results were compared/contrasted with the results of a more traditional root cause failure analysis that was contracted by the Coast Guard following the incident. Several added insights pertaining to system safety and process improvement were obtained by using STAMP. Additionally, a hazard analysis was performed on the control system using STAMP techniques. This hazard analysis yielded 92 specific design requirements that may be incorporated into future system upgrades on these or similar vessels. The thesis concludes that STAMP methodologies are appropriate to generate actionable recommendations for future control system upgrades on U.S. Coast Guard buoy tenders. It also concludes that STAMP techniques may lead to safer controls in the greater hierarchical control structure for shipboard buoy tending operations. Finally, suggestions are made for future research/application of STAMP principles in the Coast Guard's management of operational safety, asset acquisition, and cybersecurity.

Safety in U.S. Navy Navigation Applying STAMP Processes to Surface Ship Collisions

Safety in U.S. Navy Navigation Applying STAMP Processes to Surface Ship Collisions
Author: Andrew Michael Canady
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Total Pages: 0
Release: 2023
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The collisions and accidents occurring throughout the U.S. Navy surface fleet warranted the appointment of a 34-personnel review team to analyze the three ship collisions and one grounding in 2017. These accidents resulted in 17 U.S. Navy sailors' deaths and damage to the operational ships. There were 12 incidents between 2007 and 2017; this increase in frequency drove the need to conduct the review. The concern is that the fundamental causal factors were not adequately addressed and that a future collision is imminent without further corrective action. This thesis uses Dr. Nancy Leveson's Systems-Theoretic Accident Model and Process (STAMP) model of accident causation to analyze two U.S. Navy ship collisions in 2017. The Causal Analysis based on STAMP (CAST) is conducted on both collisions, and an analysis of the results is compared with the traditional U.S. Navy findings. CAST examines the system's safety control structure to assess why the designed controls were inadequate to prevent the accident. The goal of this thesis is to determine whether a STAMP approach to accident analysis would add value to the U.S. Navy. If so, it seeks to determine what new factors the CAST analysis provides and how it may be used to prevent future mishaps.

Systems Theoretic Accident Analysis of an Offshore Supply Vessel Collision

Systems Theoretic Accident Analysis of an Offshore Supply Vessel Collision
Author: John Michael Mackovjak
Publisher:
Total Pages: 114
Release: 2016
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This thesis uses Dr. Leveson's Systems-Theoretic Accident Model and Process (STAMP) model of accident causation to analyze a collision in late July 2014 between two Offshore Supply Vessels equipped with software-intensive Dynamic Positioning Systems. The Causal Analysis based on STAMP (CAST) is compared with the Root Cause Analysis, a traditional chain of events based model, used by the original investigation team after the collision. Linear chain of event models like the Root Cause Analysis often look for a broken component or incorrect action within the proximal sequence of events leading to the accident. CAST examines a system's entire safety control structure to assess why the system constraints, control loops, and process models were either inadequate or flawed. This thesis aims at identifying how the safety control structure of the Offshore Supply Vessel operations could be improved by identifying the systemic factors and component interactions that contributed to the collision. The primary objective of this thesis is to demonstrate the use of a systems theory-based accident analysis technique in analyzing a complex accident. The secondary objective of this thesis is to compare and contrast the outcomes of the Root Cause Analysis conducted by the Navy Programs organization, with the findings of the CAST analysis. Finally, this thesis examines STAMP's underlying new assumptions regarding the need for new safety analysis in the context of the findings from the CAST analysis of the collision.

Design and Simulation of a Dynamic Positioning System for a U.S. Coast Guard Buoy Tender

Design and Simulation of a Dynamic Positioning System for a U.S. Coast Guard Buoy Tender
Author: William R. Cairns
Publisher:
Total Pages: 62
Release: 1989
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This paper covers the design of a dynamic positioning system for the U.S. Coast Guard WLB IRIS class buoy tender. The control system design is based upon optimal control theory with estimates of position and heading provided by a steady state Kalman filter. Sea current estimates are provided by a Kalman filter predictor based upon the innovations process. The vessel and dynamic positioning system are simulated using the Dynamic Simulation Language (DSL).

Survey of Technology with Possible Applications to United States Coast Guard Buoy Tenders. Volume 1. Technology Assessment

Survey of Technology with Possible Applications to United States Coast Guard Buoy Tenders. Volume 1. Technology Assessment
Author: S. Allen
Publisher:
Total Pages: 340
Release: 1987
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This report is divided into three volumes. This volume I, 'Technology Assessment', contains state-of-the-art summaries and projected trends for major technology areas pertinent to buoy tender design. Volume II, 'Literature Abstracts' contains an annotated bibliography of the citations obtained during the technology survey. Volume III, 'Technology Characterization', contains a description of the relational model and documentation of the computerized database used for storage and analysis of buoy tender data. Volumes I, II, and III are contained within separate binders due to size considerations. Detailed abstracts of Volumes II and III may be found within each volume. What follows is the abstract for only Volume I. In this Volume I, 'Technology Assessment', narrative summaries of the state-of-the-art in the following areas are presented: (1) foreign aids to navigation vessels; (2) aids to navigation; foreign practices; (3) offshore supply support/work vessels; (4) hull forms for seakeeping; (5) propulsion systems; (6) Buoy weight handling systems; and (7) vessel automation, navigation, and control and monitoring. As assessment of candidate technologies within the above areas, most appropriate to new buoy tender designs, is provided.