A1. Glossary of Acoustical Terms and Abbreviations .......................................................... 41 A1.1 Abbreviations ........................................................................................................... 41 A1.2 Terms ....................................................................................................................... 42 A2. General Acoustics ........................................................................................................... 47 A3. Site Conditions ............................................................................................................... 53 A3.1 Weather: November 13, 2019 .................................................................................. 53 A3.2 Site Photos: November 13, 2019 ............................................................................. 56 A4. Calibration ...................................................................................................................... 57 A5. Equipment List ............................................................................................................... 58 Table of Figures Figure 2.1. Pickleball Paddle and Ball Impact Sound Pressure Trace.............................................6 Figure 2.2. Spectral Response of a Sharp Hit..................................................................................7 Figure 2.3. Spectral Response of a Dull Hit....................................................................................8 Figure 2.4. Fast Time Averaging Filter Response to a 0.277 Second Sound Burst.......................10 Figure 2.5. Fast Time Averaging Filter Response to a Typical Pickleball Paddle Impact.............11 Figure 3.1. Pickleball Courts.........................................................................................................13 Figure 3.2. Makes of Pickleball Paddles.......................................................................................14 Figure 3.3. Measurement Locations...............................................................................................15 Figure 3.4. Background Sound Pressure Level..............................................................................16 Figure 3.5. Sound Level Meter at Point 1......................................................................................17 Figure 3.6. Sound Level Meter at Point 2......................................................................................19 Figure 3.7. Sound Level Meter at Point 3......................................................................................21 Figure 3.8. Sound Level Meter at Point 4......................................................................................23 Figure 4.1. Unweighted Frequency Band Sound Pressure Levels Normalized to 0 dBA............27 Figure 5.1. Existing Sound Pressure Levels with Foam Quiet Ball..............................................30 Figure 5.2. Sound Pressure Levels for Dura 40 Ball without Mitigation.....................................32 Figure 5.3. Sound Pressure Levels for Dura 40 Ball with 10 Foot Perimeter Wall......................33 Figure 5.4. Sound Pressure Levels for Dura 40 Ball with 8 Foot Perimeter Wall........................34 Figure 6.1. Pickleball Court Noise Abatement Plan for Dura 40 Ball...........................................36 Figure A2.1. Equal Loudness Contours.........................................................................................48 Figure A2.2. Frequency Weighting Filter Curves..........................................................................49 Figure A2.3. Decrease of SPL with Distance Due to Spherical Spreading...................................50 Figure A2.4. Total SPL from Multiple Sources with Equal SPL Output.......................................51 Figure A3.1. Wind Speed and Bearing...........................................................................................53 Figure A3.2. Temperature and Humidity.......................................................................................54 Figure A3.3. Station Pressure.........................................................................................................55 Figure A3.4. Weather Station.........................................................................................................56 Index of Tables Table 3.1. Background Sound Pressure Level Data Summary......................................................16 Table 3.2. Sound Pressure Level Data Summary at Point 1..........................................................18 Table 3.3. Unadjusted Pickleball Sound Pressure Levels at Point 1..............................................18 Table 3.4. Sound Exposure Levels at Point 1................................................................................18
3 of 58 Spendiarian & Willis Acoustics & Noise Control LLC
12/15/2019
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