2.8.1 Power Cabling C. Chryssostomidis, C. Cooke, H. Babaee, J. Chalfant, M. Ferrante Massachusetts Institute of Technology

Goals To improve the routing capability for cable systems in Navy early-stage ship design.

CABLE ROUTING Reserved Space

Reserved-Space Approach Set aside needed space BEFORE many other items are placed. Use defined early stage ship physical structure (via ASSET and LEAPS) as input to allocate space for power distribution Power is part of Early-Stage Survivability Analysis –Enables optimum power placement while options available By positioning power first, necessary power connections for all apparatus have a known location. –Enables apparatus placement for optimum space utilization

Plan – View: Ring Power-Corridor

The Power-Corridor Structure isolation taps (On, Off) cables water barrier

Example: Power-Corridor Layout stern bow

Example: Power-Corridor Layout (With Apparatus and Bus-Bars) stern bow

CABLE ROUTING Connected Component LEAPS Population

PGM PMM LOAD PGM PMM LOAD ASSET output: Some generators and loads

PGM PMM PCM LOAD PGM PMM PCM LOAD PCM PDM

PGM PMM PCM LOAD PGM PMM PCM LOAD PCM

PGM PMM PCM PGM PCM LOAD PCM PMM PGM Not a pre-designed system

PGM PMM PCM LOAD PGM PMM PCM LOAD PCM A Template (Pattern?)

PGM PMM PGM PCM LOAD PCM PMM PGM A Template (Pattern?)

Navy Early-Stage Design Tools Hullform Gen/Trans LEAPS Database Design DataGeometryBehaviorsStudiesAnalysis Geometry and Engineering Mathematics Library (GEML) ASSET Synthesis SHCP-L Stability ISA ArrangeIHDE Hydro Rapid Ship Design Environment (RSDE) Multi-Discipline Optimization Execution Engine Design Space Exploration From: A. MacKenna, “Rapid design and integration (RDI),” NDIA Conference on Physics-Based Modeling for US Defense, Nov 6-8, 2012.

Navy Early-Stage Design Tools Hullform Gen/Trans LEAPS Database Design DataGeometryBehaviorsStudiesAnalysis Geometry and Engineering Mathematics Library (GEML) ASSET Synthesis SHCP-L Stability ISA ArrangeIHDE Hydro Rapid Ship Design Environment (RSDE) Multi-Discipline Optimization Execution Engine Design Space Exploration From: A. MacKenna, “Rapid design and integration (RDI),” NDIA Conference on Physics-Based Modeling for US Defense, Nov 6-8, Add Distribution System Design and Analysis

CABLE ROUTER TOOL

Ship Database After ASSET Run Components in Place

Ship Database No Connectivity

PGM PMM LOAD PGM PMM LOAD Ship Database

Template Database Template sections set up in LEAPS Database S3D Equipment Catalog Components are instantiated Component Items

PDM Ring Bus Segments PDM

Template Database Same system segment in LDB view Connectivity complete

Bus Node Generator to Bus connection Cable RectifierGenerator = Ports Terminals Port-Terminal Linkage Exchange Connection Component Exchange Connection Members for elec pwr

Template Database Component Detail Note: Referenced catalog item Connections Nodes These system segments can be created in S3D.

Cable Router Tool System Segments available in template database Open ship database Establish ring bus: –Copy forward and aft segments, add center segments as required for number of zones. –Establish connectivity and create diagram. Connect generator to ring bus: –Copy generator connection template and establish connectivity. Connect PMM to ring bus: –Copy PMM connection template and establish connectivity.

PGM PMM PCM LOAD PGM PMM PCM LOAD PCM PDM Ship Database after Cable Router Tool

Long-Range Concept Preprocessing step – after ASSET, before S3D. Place “reserved space” blocks in a LEAPS database for the main power corridor. Instantiate components in LEAPS for main power corridor and establish connectivity. Connect power generation, storage, and use devices to power corridor by instantiating components and establishing connectivity. Size components based on power flow. Resolve positioning/overlap conflicts.

THERMAL MODELING OF CABLES