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Easy5 ECS Noise Model

Easy5 ECS Noise Model. Gene Stubbs Boeing Noise Technology May 17, 2000. Easy5 ECS Noise model . NOISE ENGINEERING TECHNOLOGY Boeing Commercial Airplane Group . Objective Create an Easy5 macro component library to model flow noise generation and transmission in an airplane ECS

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Easy5 ECS Noise Model

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  1. Easy5 ECS Noise Model Gene Stubbs Boeing Noise Technology May 17, 2000

  2. Easy5 ECS Noise model NOISE ENGINEERING TECHNOLOGY Boeing Commercial Airplane Group • Objective • Create an Easy5 macro component library to model flow • noise generation and transmission in an airplane ECS • (Environmental Control System). • Motivation • ECS noise may be a significant component of airplane cabin • noise both on the ground and in flight. • System design changes require rapid estimate of noise impact. • Long term vision for integrated cabin noise prediction process.

  3. Easy5 ECS Noise model NOISE ENGINEERING TECHNOLOGY Boeing Commercial Airplane Group Typical aircraft ECS

  4. Easy5 ECS Noise model NOISE ENGINEERING TECHNOLOGY Boeing Commercial Airplane Group • Reasons for using Easy5 • No suitable 3rd party code available • Existing Easy5 ‘EC’ (Environmental Control) flow library. • Existing ECS group ‘AD’ (Air Distribution) flow library. • Previous use by ECS group for 747, 777 ECS modeling. • User interface, model management, solvers, etc. • Support infrastructure. • Availability within Boeing.

  5. Easy5 ECS Noise model NOISE ENGINEERING TECHNOLOGY Boeing Commercial Airplane Group

  6. Easy5 ECS Noise model NOISE ENGINEERING TECHNOLOGY Boeing Commercial Airplane Group • Noise model features • System model assembled from duct component macros • Solve for local flow parameters using existing flow algorithms • Calculate flow noise based on local flow conditions using • handbook formulas, empirical extrapolation, etc. • Model upstream and downstream propagating octave band noise • (8-vector noise inputs and outputs at each component port) • Steady state only. • Upstream pressure is state variable per ‘EC’ library. • Noise generation, transmission, attenuation, and end reflections. • Global and component level noise calculation on/off switches.

  7. Easy5 ECS Noise model NOISE ENGINEERING TECHNOLOGY Boeing Commercial Airplane Group

  8. Easy5 ECS Noise model Component list NOISE ENGINEERING TECHNOLOGY Boeing Commercial Airplane Group

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