THE CHALLENGES OF ELECTRONIC ENCLOSURES FOR US NAVY
- Slides: 11
THE CHALLENGES OF ELECTRONIC ENCLOSURES FOR US NAVY SHIPS Frank Duvergne 901 D, LLC 3/2018 Rel 01 1
WHAT MAKES US NAVY SHIPBOARD ENCLOSURES SO SPECIAL? • Stringent Environmental requirements – – Shock/Vibration Temperature Water Drip EMI • Mission-specific requirements – Equipment – I/O (Input/Output) – HMI (Human Machine Interface) 2
WHY NOT THE SAME RACK EVERYWHERE? • Ship-related requirements – – – Ship type Available space Cable entry Foundation locations Hatchability • Mission-related requirements – – – Equipment type, size and weight Number/types of I/O HMI requirements (display, keyboard) Maintenance requirements TEMPEST requirements 3
MINIMIZE COST/SCHEDULE IMPACT OF CUSTOM SOLUTION • • Reliance on proven structural frame Modular design Same isolation system for different deck frequencies Modular isolation system to accommodate wide range of payloads – Same basic mount dimensions and interface, different characteristics – Provisions for growth in number of isolators 4
EXAMPLES OF MODULAR DESIGNS 5
DIFFERENT TYPE OF ELECTRONICS ENCLOSURES • Hard Mounted • Externally isolated, base mounted • Externally isolated, bulkhead mounted • Internally isolated • Consoles 6
METHODS OF CONSTRUCTION • Welded • Bolted – Formed metal – Machined/extrusion – Combination 7
RACK STRUCTURE IS ONLY PART OF THE SOLUTION • Proper internal Equipment mounting is key to Shock/vibration mitigation • Everything is in the brackets! 8
MIL-DTL-901 E • Replaces MIL-S-901 D as of June 2017 • Evolutionary rather than revolutionary • Introduces DSSM (Deck Simulating Shock Machine) as alternate shock vehicle for heavyweight shock test • Applies to new programs (e. g. FFG(X)) 9
THE KEY CHALLENGE: THERMAL MANAGEMENT • The challenges Increase of electronics density High max ambient temperature COTS usually not rated for high temperature Cannot cool to lower than max ambient temperature with forced-air cooling! – Airborne noise due to fans – – • How to address them – – – Thermal simulation Ducting Control fan speed vs temp Choice of equipment Alternates to forced-air cooling: cold plate, air/water heat exchangers, Thermo-Electric Cooler (TEC). 10
THE “HOSTING SOLUTION” APPROACH • Provide an integrated solution, based on functional requirements from customer • Hosting solution includes – – – – Shock isolated enclosure Power supply and distribution: UPS, PDU, Wiring Harness Cooling subsystem HMI I/O Generic computing power Mechanical and electrical interface for mission-specific equipment ( can be installed by customer or by supplier) • Advantage: single point of responsibility from design to delivery. 11
