PROPULSION SYSTEM DESIGN

Propulsion System Design

Gibbs & Cox, Inc. possesses extensive experience in design, integration, and testing of surface ship propulsion power systems. Proven design capability supports feasibility and trade-off studies, preliminary designs, contract designs and detail designs of shipboard and land-based test site propulsion systems installations, as well as test and trials support and problem identification and correction. Some propulsion system design tasks performed by Gibbs & Cox, Inc. include:

Mechanical and electric drive systems Propulsion system trade-off studies to optimize performance and cost Hydrodynamic design and model testing, speed/powering and fuel endurance analyses Equipment sizing, selection, procurement and evaluation Shafting sizing, arrangement, and alignment studies Equipment and hull girder vibration analysis

Airborne and structure borne noise predictions Scale model and full size flow testing of intake/uptake systems RMA/FMECA analysis Survivability analysis Dynamic response analysis Controls system engineering Total ownership cost analyses Land based test site design

Application of Integrated Electric Power Systems to Naval Shipbuilding Programs

Gibbs & Cox, Inc. has been at the forefront of naval integrated electric power system design and development, including support to the Integrated Power System (IPS) Program (Integrated Propulsion and Ships Electric Power), as well as developing engineering evaluation studies for the following programs:

LHD 8 LHA(R) R/V TRITON JCC(X)	T-AKE DD 21/DD(X) Blue Team DDG 51 Flight IIA
R.V Triton

Recent Propulsion System Related Projects include the following:

• Focused Mission High Speed Ship Concept Design - Developed and integrated CODAG Propulsion system using water jet propulsions. Efforts included system trade studies, cost studies and analyses, development o initial propulsion support systems designs.
• Littoral Combat System Preliminary Design - Further development of the FMHS design which included development of inquiry specifications for major propulsion related equipment, refinements of support systems design, integration with hull form and topside development, CAIV analysis, risk assessment, shafting system design development including preliminary vibration analyses.
• LHA(R) Replacement for LHA Class Ships - Presently providing direct engineering support to the LHA (R) Machinery IPT and NAVSEA Philadelphia in the areas of gas turbine intake/uptake system design/integration and trade study evaluating gas turbine versus diesel prime movers in ship service generator application. Developed preliminary ship service gas turbine generator set machinery arrangements (as a replacement for diesel generator sets) including the combustion air intake and exhaust systems.
• LHD8 Propulsion Plant Upgrade - Currently providing direct engineering support to the LHD 8 Ship Design Manager and NAVSEA Philadelphia in the areas of propulsion system design and integration. Key contributions include a Main Reduction Gear/Propulsion System Vibration risk management effort and an LHD 8 exhaust gas plume study, both necessitated by the steam to gas turbine propulsion plant upgrade. Other areas of support include reviews of shipbuilder calculations, machinery arrangements, and piping system designs.

Gibbs & Cox, Inc. utilizes an extensive suite of software to develop and optimize ships propulsion systems while maintaining the ability to perform such tasks through traditional means. Our Software suite includes:

Dynamic Response Analysis	MNUVR	G&C Developed Program to Predict Ship Maneuvering Performance And Propulsion System Response For Ahead (Including Crash Ahead) And Astern (Including Crash Astern) Maneuvers Using Typical Engine Propeller Controls.
Naval Architecture	NAVCAD	Speed/Power Predictions
NAVAL ARCHITECTURE/SHIP SYNTHESIS	SHIPOPT	G&C developed ship synthesis tool.
Noise Calculations	PRDCT	G&C Developed Program to Compute The Radiated And Self-Noise Levels Of Each Machinery Item And The Total Radiated And Self-Noise Levels Of A Ship, A Sum Of All Machinery Sources, From The Structure borne Noise Of Machinery.
Propulsion Shafting Design And Analysis	NBEAR	G&C Developed Program to Calculate Influence Numbers By Successive Integration Of Equations Assuming The Shaft To Be Weightless And To Act As A Cantilever With A Unit Force Applied To Each Bearing Successively. This Program Then Calculates The Shear Force, Bending
Reduction Gear Sizing	RED-GEAR.EXE	G&C Developed Program to Estimate The Size/Weight Of Each Element Within The Reduction Gear. The Program Is Designed For Double Input Shaft To Single Output Shaft. Program Output Includes Pitch Diameter, Face Width, Mesh Loss (Hp), Bearing Diameter, Bear
Reliability Maintainability And Availability	TIGER	This Is A Government Furnished Program Calculates The Reliability And Availability Of Systems And Equipment.
Resilient Mount Calculations	MNT12	G&C Developed Program to Determine The Six Natural Frequencies And Mode Shapes Of Any Piece Of Equipment Which Is Mounted On Resilient Mounts And The 12 Natural Frequencies And Mode Shapes Of Equipment Mounted On A Compound Isolation System.
Resilient Mount Calculations	RES.MOUNT	G&C Developed Program to Calculate Natural Frequency Of Resiliently Mounted Equipment.
Shaft Vibration	LONGVIBE	G&C Developed Program Used For Longitudinal Shaft Vibration.
Shaft Vibration	TORVIBE	G&C Developed Program Used For Torsional Shaft Vibration.
Shaft Vibration	TRANSVIBE	G&C Developed Program Used For Lateral/Whirling Shaft Vibration.
Speed/Power Calculations	SPEED	G&C Developed Program to Calculate Hull Resistance As A Function Of Ship Speed Based On Taylor's Standard Series Using Hull Characteristics As Input. Appendage Resistance And Propeller Performance Can Be Introduced As Input To Determine Propeller Horsepower Require