Integrated Noise Model Accuracy for General Aviation Aircraft (2014) / Chapter Skim
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From page 6... ...
2 State of the Practice: How are GA Aircraft Being Modeled? This state of the practice section documents the results of two efforts to determine current noise modeling practice for GA aircraft: Section 2.1a literature search; Section 2.2a web-based survey of Integrated Noise Model (INM)
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2.1.3 "Fitchburg Municipal Airport Noise Measurement Study: Summary of Measurements, Data and Analysis" Reherman, C.N., C.L.
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value of our approach, but the study provides no information directly applicable to our assessment of INM accuracy in computing standard noise metrics for GA aircraft. 2.1.6 "Error Sensitivity Analysis of the Integrated Noise Model" Restrick, K., EEC Note: EEC/ENV/2002/006, 28/06/2002 This report was reviewed because, under the expanded work plan, we proposed under "Identify causes of discrepancies: modification of INM input" to "Modify Coefficients," page 9 of the plan.
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noise was approximately 7 ANEF units higher than predicted by a 1982 National Acoustics Laboratory survey of residents living around five major Australian airports. Validation of the INM ANEF contours showed that actual noise levels from aircraft overflights were 3 ANEF units higher than the computed ANEF levels.
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• LinkedIn5 INM User Group • Airport Consultants Council (ACC) 6 database of firms identified as providing noise compatibility consulting • Known INM modelers HMMH and MCG contact lists • Internet research conducted by MCG – determined that most potential INM users were already included in the above lists Combined, the initial potential U.S.
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2.2.4.1 Summary Generalizations The following summary percentages are based on the number of respondents who answered each specific question. Except for question 1, which was answered by 97 from the U.S.
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those who are very familiar with modeling GA aircraft and who best represent the state of the practice for using the INM to model GA aircraft. Question #1 What best describes your organization?
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Question #4 What data sources have you used for estimating types of GA aircraft to model EXISTING noise? Answer Summary U.S.
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Question #6 What data do you use to specify weather conditions? Answer Summary U.S.
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Question #9 When you have wanted to model a GA aircraft not in the standard INM database, have you: Answer Summary U.S. Respondents Int'l Respondents Rarely Mostly Rarely Mostly Excluded it - modeling 50% 6% 45% 3% Used INM standard sub 5% 43% 14% 38% Assigned standard type 9% 36% 14% 41% Developed user defined 36% 15% 27% 19% Question #10 Have you compared INM modeled GA aircraft noise with measured noise?
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1. More GA aircraft types were provided as standard types in the INM database 2.
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