Page 38: of Marine News Magazine (June 2022)
Combat & Patrol Craft Annua
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Where Failure is not an Option
Naval vessels cannot afford to lose critical systems following an impact. Brian Stanton, North America
Engineering Lead at Parker Hanni? n
Gas Turbine Division, talks about the extensive testing required for inlet ? ltration systems used on these ships.
By Brian Stanton, North America Engineering Lead at Parker Hanni? n Gas Turbine Division nlet ? ltration used for critical ship systems, such as on the propulsion gas turbines, must pass rigorous test- ing prior to installation. These tests include a range of vibration and shock tests that simulate ship operation
I and test the working of the system in the event of an im- pact or explosion.
Vibration testing
Navies have standards for vibration testing. In the US, for example, MIL-STD-167-1A details requirements for
US Navy vessels to ensure equipment remains reliable with vibration from the engines, propellers, and other onboard systems. It details a testing range of 4-33 Hz, although a speci? c vessel may only require a smaller range.
Testing begins with an exploratory phase whereby equip- ment is ? xed to a vibration table and testing at each fre- quency for a brief, 15 second interval. This helps establish that there are no obvious problems before more in-depth testing commences. At lower frequency ranges, the test table uses higher amplitudes, and at higher frequencies, lower amplitudes.
The table is then adjusted to run each frequency for a period of ? ve minutes. Based on readings from accelerom-
All images: Parker Hanni? n 38 | MN June 2022