NOISE AND VIBRATION CONTROL Episode 5 ppt

... 52 52 52 53 53 53 55 57 61 56 0 53 53 53 54 54 55 56 59 63 630 54 54 55 55 55 56 57 61 65 710 55 55 56 56 56 57 59 63 68 800 56 56 57 57 57 58 60 64 70 890 57 57 58 58 59 60 62 66 73 1000 58 58 59 59 ... 46 47 49 250 46 46 46 46 46 47 47 49 50 280 47 47 47 47 48 48 48 50 52 3 15 48 48 48 48 49 49 50 51 54 355 49 49 49 49 50 50...

Ngày tải lên: 13/08/2014, 05:22

... 36 35 36 36 36 37 36 36 37 37 38 36 38 41 43 44 41 44 45 47 48 45 48 49 50 51 50 52 53 54 55 54 56 57 58 59 58 60 61 62 63 45 48 49 51 52 Table 4-13. Transmission Loss (in dB) of Type 2 Floor-Ceiling ... (in.) 4 6 8 10 12 Octave Frequency Band (Hz) 31 29 33 35 37 38 63 35 37 38 39 40 1 25 37 38 40 41 42 250 38 41 44 46 48 50 0 43 47 49 51 53 1000 48 53 54...

Ngày tải lên: 13/08/2014, 05:22

... Band Center Frequency (Hz) 63 1 25 250 50 0 1000 2000 4000 4 8 8 8 10 10 14 Type 2 Mineral Fiber Tile 5/ 8” - 35 lb/cu.ft 5 9 10 12 14 15 15 Type 3 Sheet Rock 5/ 8" - 22 lb/sq.ft 10 15 21 25 ... high-frequency noise. 6 -5 TM 5- 8 05- 4/AFJMAN 32-1090 Table 7-3. Attenuation in Lined Ducts. 7-6 TM 5- 8 05- 4/AFJMAN 32-1090 A. Proper and Improper Airflow Conditions to an...

Ngày tải lên: 13/08/2014, 05:22

... for Octave Indicated Angle From Axis Frequency Band 1 35 and (Hz) 0º 45 60° 90 oa larger a 31 8 5 2 -2 -3 63 8 5 2 -3 -4 1 25 8 5 2 -4 -6 250 8 6 2 -6 -8 50 0 9 6 2 -8 -10 1000 9 6 1 -10 -13 2000 10 7 ... dB) for Unmuffled Engine Exhaust Noise. Octave Value to Frequency be Subtracted Band From Overall PWL (Hz) (dB) 31 5 63 9 1 25 3 250 7 50 0 15 1000 19 2000 25 4000 3...

Ngày tải lên: 13/08/2014, 05:22

... 1992 Beranek, Leo L., Noise & Vibration Control, The Institute of Noise Control Engineering, Washington, DC, 1988 Schaffer, Mark E., A Practical Guide to Noise and Vibration Control for HVAC Systems, ... pressure to Glossary-l TM 5- 8 05- 4/AFJMAN 32-1090 BIBLIOGRAPHY Harris, Cyril M., Noise Control in Buildings, McGraw-Hill, New York, NY 1994 Jones, Robert S., Nois...

Ngày tải lên: 13/08/2014, 05:22

... 5- 1 5- 1 Distance Effects 5- 2 5- 1 Atmospheric Effects 5- 3 5- 4 Terrain and Vegetation 5- 4 5- 6 Barriers 5- 5 5- 7 Reception of Outdoor Noise Indoors 5- 6 5- 11 Combined Effects, Sample Calculation 5- 7 ... Propagation 5- 2 5- 2. Downwind sound diffraction 5- 6 5- 3. Upwind Sound Diffraction 5- 6 5- 4. Effects of Temperature Gradients on Sound Propagation 5- 7 5-...

Ngày tải lên: 13/08/2014, 05:22

... Raised 74 80 68 74 62 68 56 62 53 59 50 56 48 54 46 52 44 50 Voice Level Very Loud 86 80 74 68 65 62 60 58 56 Shouting 92 86 80 74 71 68 66 64 62 SIL is arithmetic average of noise levels in the 50 0-, 1000-, and ... -14 -14 - 15 - 15 - 15 2000 -9 -12 - 15 -16 -17 -17 -17 -18 -18 3200 -10 -13 -16 -17 -18 -19 -19 -20 -20 50 00 -10 -14 -17 -18 -20 -21 -21 -22 -23 700...

Ngày tải lên: 13/08/2014, 05:22

... C) Ratio S W /R 2 0.00 0.07 0. 15 0. 25 0.38 0 .54 0. 75 1.0 1.3 "C" (dB) Ratio S W /R 2 "C" (dB) Ratio S W /R 2 "C" (dB) +6 1.7 -3 15 -12 +5 2.2 -4 20 -13 +4 2.9 -5 25 -14 +3 3.7 -6 31 - 15 +2 4.7 -7 40 -16 +1 6.1 -8 50 -17 0 7.7 -9 63 -18 -1 9.7 -10 80 -19 -2 12.0 -11 100 ... Partitions. Octave Frequency Band Type Type Type Improvements (Hz) 1 2 3...

Ngày tải lên: 13/08/2014, 05:22

... 5 3 5 11 23 31 34 19 13 Drop 7 5 9 16 32 41 43 24 16 10 6 15 22 37 52 53 35 23 Standard 3 3 6 13 23 33 33 23 14 Pressure 5 4 11 20 37 44 44 36 22 Drop 7 6 13 28 42 47 47 45 30 10 8 15 35 50 56 ... be: Octave Band Center Frequencies 63 1 25 250 50 0 1k 2k 4k Lp (4 diffusers) 57 53 41 31 35 35 18 NC 30 criteria 57 48 41 35 31 29 28 Required Reduction (Considering Fou...

Ngày tải lên: 13/08/2014, 05:22

... feet. 8-12 TM 5- 8 05- 4/AFJMAN 32-1090 Table 8-7. Vibration Isolation Mounting for Boilers. 8- 15 TM 5- 8 05- 4/AFJMAN 32-1090 Table 8-12. Vibration Isolation Mounting for Transformers. 8-20 TM 5- 8 05- 4/AFJMAN ... building and will give very satisfac- tory results acoustically. 8-11 TM 5- 8 05- 4/AFJMAN 32-1090 Table 8-8. Vibration Isolation Mounting for Propeller-Type Cooling...

Ngày tải lên: 13/08/2014, 05:22