NOISE AND VIBRATION CONTROL Episode 3 doc

... 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 4000 44 48 50 3 6 8000 48 52 54 3 ... 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&q...

Ngày tải lên: 13/08/2014, 05:22

... 10. NOISE AND VIBRATION MEASUREMENTS Objective 10-1 10-1 Sound and Vibration Instrumentation 10-2 10-1 Measurement of Noise and Vibration in Buildings 10 -3 10-2 Measurement of Noise and Vibration ... Abbreviation and Terms 1-6 1-1 2. Noise and Vibration Criteria General 2-1 2-1 Noise Criteria In Buildings 2-2 2-1 Vibration Criteria In Building 2 -3 2-4 3....

Ngày tải lên: 13/08/2014, 05:22

... -22 - 23 7000 -10 -14 -16 -19 -21 -22 - 23 -24 -25 10000 -10 -14 -19 -21 -22 - 23 -24 -25 -26 20000 -10 -15 -20 -22 -24 -26 -27 -30 -30 Infinite -10 -15 -21 -24 -27 -30 -33 -36 -39 above 1000 Hz). Therefore, ... 5-805-4/AFJMAN 32 -109 Figure 3- 2. Room Constant Estimate 3- 5 TM 5-805-4/AFJMAN 32 -1090 Table 3- 3. Sound Absorption Coefficients of General Building Materials and...

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, ... 1988 Harris, Cyril M., Shock & Vibration Handbook, 3rd Edition, McGraw-Hill, New York, NY 1988 Beranek, Leo L. & Ver, Istvan L., Noise and Vibration Cont...

Ngày tải lên: 13/08/2014, 05:22

... (in.) 4 6 8 10 12 Octave Frequency Band (Hz) 31 29 33 35 37 38 63 35 37 38 39 40 125 37 38 40 41 42 250 38 41 44 46 48 500 43 47 49 51 53 1000 48 53 54 56 57 2000 53 57 59 61 62 4000 57 61 63 64 65 8000 61 64 67 68 69 STC 48 51 52 55 57 Air ... 18 7 12 17 18 19 12 17 18 19 22 17 18 19 22 30 18 19 22 30 35 19 22 30 35 39 22 30 35 39 43 30 35 39 43...

Ngày tải lên: 13/08/2014, 05:22

... HZ Distance Distance Term (DT). d8 D ft. 31 63 125 250 500 1000 2000 4000 8000 80 36 36 36 36 36 36 36 37 37 89 37 37 37 37 37 37 37 38 39 100 38 38 38 38 38 38 39 39 40 112 39 39 39 39 39 39 40 40 41 125 40 40 40 40 ... DT ft. dB ft. dB 1 .3 0 18 23 1.8 3 20 24 2.5 6 22.5 25 3. 2 8 25 26 4 10 28 27 5 12 31 .5 28 6 .3 14 35 .5 29 8 16 40 30 9...

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

... 14 21 22 14 11 Pressure 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 ... octave bands. Octave Band Center frequencies 63 125 250 500 1k 2k 4k Branch att. in corridor 888888 “T” in room 33 333 33 Diffuser Take-of...

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 ... Equipment Assembly. 8- 13 TM 5-805-4/AFJMAN 32 -1090 Table 8-9. Vibration Isolation Mounting for Centrifugal-Type Cooling Towers. 8-17 TM 5-805-4/AFJMAN 32 -1090 Tabl...

Ngày tải lên: 13/08/2014, 05:22

... octave Center 16 Upper Lower band band limit limit Center 22 31 .5 44 63 88 125 177 250 35 5 500 710 1,000 1,420 2,000 2,840 4,000 5,680 8,000 11 ,36 0 16,000 22,720 14.1 17.8 22.4 28.2 35 .5 44.7 56.2 70.8 89.1 112 141 178 224 282 35 5 447 562 708 891 1,122 1,4 13 1,778 2, 239 2,818 3, 548 4,467 5,6 23 7,079 8,9 13 11,220 14, 130 17,780 16 20 25 31 .5 40 50 63 80 100 125 160 2...

Ngày tải lên: 13/08/2014, 05:22