Team 4 – Linkabit Noise Reduction
Week 7 Status Update
Overview of Status of Analysis, Design, Fabrication, Tests, etc.
Fabricating prototypes
Accomplishments from Previous Week
Recorded baseline (bare turbine) noise mapping
Ordered material for fabrication
Ordered parts for pressure measurements (lines, connectors)
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Fabricate body for bulk flow
Begin fabrication of prototypes (chevrons, diffuser)
Order pressure sensors
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments
Tom provided more specifications on the dimensions of our suppression system
Instructor Comments from Last Meeting and Actions Taken to Address these Comments
Comment: Maybe look at flow rate as an alternate to back pressure (2/13)
Action: After discussing with Tom, looking at back pressure is a higher priority for the functionality of the turbine
Student Comments
Comment: Need to look at materials that can withstand the high heat
Action: Stainless steel can withstand required temperatures
Comment: What creates the majority of the noise: turbulence or shearing?
Action: Turbulence, but shearing amplifies this noise.
Comment: Higher temperature related to higher speed of sound?
Action: Yes, we have reevaluated the equations and we are working in subsonic conditions
Comment: Maybe look into some composite materials that have noise cancelling properties
Action: Most composites are brittle and unable to withstand the high temperatures
Risks and Areas of Concern
Turbine operation
Breakout noise
Cycle fatigue (fatigue life) – low risk
Back pressure limitations
Schedule
Fabricate main exhaust body (this week)
Fabricate/test chevron and diffuser prototypes (next week)
Budget (list amount spent and amount remaining)
$384.16 - SPL meter
$3040.44 Remaining