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93 CHAPTER 8. THE PATH FORWARD The objective of this taxi noise scoping project was to determine the best way to model airport noise from aircraft taxi operations and to create a plan for implementation of a taxi noise prediction capability into INM in the short term and AEDT in the longer term. While the scoping study suggestions were developed for both INM and AEDT, we suggest short term implementation in INM, so that an improved taxi modeling capability may be provided to the noise modeling community sooner rather than later. Sections 6 and 7 itemized the various computational, GUI and database elements which will need to be implemented in INM and/or AEDT, to provide a taxi noise modeling capability. A composite summary of the suggested and minimum required features are presented in Table 11. Data gathering and database development need be performed only once. Because of the two completely different programming language platforms of INM and AEDT, computational algorithm development for AEDT following development of computational algorithms for INM, result in only a 25% savings in the level of programming effort. The projected ROM cost for implementing a taxi noise capability in INM alone is $220k, in INM + AEDT is $310k and in AEDT only is $240k. Included in these estimates is the approximate $130k cost for development of the various aircraft and acoustic taxi databases.
94 TABLE 11 Summary Level of Effort for INM, INM+AEDT and AEDT Recommended INM Implementation Comput- ational GUI Database Prep. ROM Effort (Hrs) ROM Cost ($) Section Taxi Tracks X X 80 $12k 2.1.1 Taxi and Hold Profiles X X 160 $24k 2.1.2 Aircraft Engine Height Dataset X 60 $9k 2.1.2 Spectral Class X 40 $6k 2.2.1 Spectral Class - Reference 6 X 80 $12k 2.2.1 Spectral Class - Add'l Measurements X 300 $60k 2.2.1 Spectral Class X 80 $12k 2.2.1 NPD by Aircraft Type X 160 $24k 2.2.2 NPD by Aircraft Type X 40 $6k 2.2.2 NPD by Aircraft Type X 40 $6k 2.2.2 Longitudinal Directivity - by AC Class X 160 $24k 2.2.3 Longitudinal Directivity - by AC Class X 120 $18k 2.2.3 Longitudinal Directivity - by AC Class X 20 $3k 2.2.3 Directivity Smoothing at Large Dist. X 20 $3k 2.2.4 Lateral Directivity X 20 $3k 2.2.5 Totals 1380 $222k AEDT Implementation Building upon INM Implementation Comput- ational GUI Database Prep. ROM Effort (Hrs) ROM Cost ($) Section Taxi and Hold Profiles X X 160 $24k 3.2.2 Spectral Class X 40 $6k 2.2.1 Spectral Class X 60 $9k 2.2.1 NPD by Aircraft Type X 30 $5k 2.2.2 NPD by Aircraft Type X 40 $6k 2.2.2 Longitudinal Directivity - by AC Class X 90 $14k 2.2.3 Longitudinal Directivity - by AC Class X 20 $3k 2.2.3 Directivity Smoothing at Large Dist. X 15 $2k 2.2.4 Lateral Directivity X 15 $2k 2.2.5 Gate Polygon Taxi Extension in EDMS X X 80 $12k 3.2.3 Terminal Area X 40 $6k 3.2.4 Totals 590 $89k AEDT Implementation In Isolation Comput- ational GUI Database Prep. ROM Effort (Hrs) ROM Cost ($) Section Taxi Tracks X X 80 $12k 2.1.1 Taxi and Hold Profiles X X 160 $24k 2.1.2 Aircraft Engine Height Dataset X 60 $9k 2.1.2 Spectral Class - Reference 6 X 80 $12k 2.2.1 Spectral Class - Add'l Measurements X 300 $60k 2.2.1 Spectral Class X 40 $6k 2.2.1 Spectral Class X 80 $12k 2.2.1 NPD by Aircraft Type X 160 $24k 2.2.2 NPD by Aircraft Type X 40 $6k 2.2.2 NPD by Aircraft Type X 40 $6k 2.2.2 Longitudinal Directivity - by AC Class X 160 $24k 2.2.3 Longitudinal Directivity - by AC Class X 120 $18k 2.2.3 Longitudinal Directivity - by AC Class X 20 $3k 2.2.3 Directivity Smoothing at Large Dist. X 20 $3k 2.2.4 Lateral Directivity X 20 $3k 2.2.5 Gate Polygon Taxi Extension in EDMS X X 80 $12k 3.2.3 Terminal Area X 40 $6k 3.2.4 Totals 1500 $240k
