NOISE AND VIBRATION CONTROL Episode 4 pptx

... 32 34 36 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.) (Hz) 1 1 1 14 2 31 33 38 41 44 16 63 39 42 44 46 48 125 41 43 46 48 51 250 44 48 51 54 58 500 50 54 57 60 64 1000 56 61 64 66 69...

Ngày tải lên: 13/08/2014, 05:22

... Width (inches) Octave Band Center Frequency (Hz) 63 125 250 500 1K 6 18 13 8 4 8 16 10 6 2 10 14 9 3 2 12 13 8 4 1 16 10 6 2 1 20 9 5 2 1 24 8 4 1 0 28 7 3 1 0 32 6 2 1 0 36 5 2 1 0 48 4 1 0 0 72 2 1 0 0 1 1 1 0 0 0 0 0 0 0 0 0 7-8 TM ... the architect and engineer to problems of noise and vibration. This is an important first step to noise control. Without awareness, t...

Ngày tải lên: 13/08/2014, 05:22

... Overall PWL, in dB Band (Hz) Casing Inlet Exhaust 31 10 19 12 63 7 18 8 125 5 17 6 250 4 17 6 500 4 14 7 1000 4 8 9 2000 4 3 11 40 00 4 3 15 8000 4 6 21 A-weighted, 2 dB(A) 0 4 (DRPR) (splash-proof ... Axis Frequency Band 135° and (Hz) 0º 45 ° 60° 90 oa larger a 31 8 5 2 -2 -3 63 8 5 2 -3 -4 125 8 5 2 -4 -6 250 8 6 2 -6 -8 500 9 6 2 -8 -10 1000 9 6 1 -10 -13 2000 10 7 0...

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, ... to Glossary-l TM 5-805 -4/ AFJMAN 32-1090 BIBLIOGRAPHY Harris, Cyril M., Noise Control in Buildings, McGraw-Hill, New York, NY 19 94 Jones, Robert S., Noise &...

Ngày tải lên: 13/08/2014, 05:22

... Specification 9 -4 B-1. Bandwidth and Geometric Mean Frequency of Standard Octave and 1/3 Octave Bands B-6 UFC 3 -45 0-01 15 May 2003 1 UNIFIED FACILITIES CRITERIA (UFC) NOISE AND VIBRATION CONTROL ... System 9 -4 9-1 Sound Levels for Equipment 9-5 9-1 CHAPTER 10. NOISE AND VIBRATION MEASUREMENTS Objective 10-1 10-1 Sound and Vibration Instrumentation 10-2...

Ngày tải lên: 13/08/2014, 05:22

... Shown. Distance (ft.) 1/2 1 2 4 6 8 10 12 16 Normal 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 ... "D" (in ft.) from Equipment "R" (ft. 2 ) 3 5 10 15 20 30 40 60 80 100 -3 -4 -4 -4 -4 -4 -4 -4 -4 200 -5 -6 -7 -7 -7 -7 -7 -7 -7...

Ngày tải lên: 13/08/2014, 05:22

... Partitions. Octave Frequency Band Type Type Type Improvements (Hz) 1 2 3 A B 31 4 9 6 2 2 63 10 16 12 2 2 125 17 24 20 3 2 250 26 34 30 3 3 500 34 42 39 4 4 1000 40 48 46 4 4 2000 46 46 52 3 5 40 00 44 48 50 3 6 8000 48 52 54 3 5 STC 37 44 41 3 3 Notes : Type ... 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 1...

Ngày tải lên: 13/08/2014, 05:22

... 39 40 112 39 39 39 39 39 39 40 40 41 125 40 40 40 40 40 40 41 41 42 140 41 41 41 41 41 41 42 42 43 160 42 42 42 42 42 42 43 44 45 180 43 43 43 43 43 44 44 45 46 200 44 44 44 44 44 45 45 46 48 225 ... 44 44 44 44 45 45 46 48 225 45 45 45 45 45 46 46 47 49 250 46 46 46 46 46 47 47 49 50 280 47 47 47...

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 57 57 40 Octave ... fan and the diffusers are determined. (1) Fan Lw. From equation 10-5 and table 10-13. Octave Band Center Frequencies 63 125 250 500 1k 2k 4k Fan Kw 47 43 39...

Ngày tải lên: 13/08/2014, 05:22

... re- quired to achieve near inaudibility. The noise and vibration control methods given here are designed to be simple to follow and to put into use. If these methods and recommendations are carried out, with ... feet. 8-12 TM 5-805 -4/ AFJMAN 32-1090 Table 8-7. Vibration Isolation Mounting for Boilers. 8-15 TM 5-805 -4/ AFJMAN 32-1090 Table 8-12. Vibration Isolation Mounting f...

Ngày tải lên: 13/08/2014, 05:22