NOISE AND VIBRATION CONTROL Episode 6 pptx

... Width (Inches) Octave-Band Center Frequency (Hz) 63 125 250 500 1K 6 20 14 9 5 8 18 12 7 3 10 16 10 6 2 12 14 9 5 2 16 12 7 3 1 20 10 6 2 1 24 9 5 2 1 28 8 4 1 0 32 7 3 1 0 36 6 3 1 0 48 5 2 1 0 72 3 1 0 0 2 1 1 1 0 0 0 0 0 0 0 0 B. ... 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...

Ngày tải lên: 13/08/2014, 05:22

... (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 2000 61 66 70 72 74 4000 67 72 75 76 77 8000 70 75 78 81 83 STC 55 59 61 64 68 Note : 1. If ... 37 39 41 42 44 125 39 41 43 44 46 250 41 44 48 50 52 500 46 50 53 55 58 1000 52 57 59 61 63 2000 57 62 64 66 68 4000 62 67 69 7...

Ngày tải lên: 13/08/2014, 05:22

... 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 -12 - 16 4000 10 7 -1 -14 ... a detailed analyses of the noise and noise control of ducted ventilation systems. b. Noise reduction from fan housing. The fan housing and its nearby connected ductwork...

Ngày tải lên: 13/08/2014, 05:22

... 32-1090 BIBLIOGRAPHY Harris, Cyril M., Noise Control in Buildings, McGraw-Hill, New York, NY 1994 Jones, Robert S., Noise & Vibration Control in Buildings, McGraw-Hill, New York, NY 1984 Fry, Alan, Noise Control in ... Engineering Noise Control, Unwin Hyman, Boston, MA 1988 Harris, Cyril M., Shock & Vibration Handbook, 3rd Edition, McGraw-Hill, New York, NY 1988 Ber...

Ngày tải lên: 13/08/2014, 05:22

... Control Introduction 6- 1 6- 1 Indoor Sound Analysis 6- 2 6- 1 Outdoor Sound Problem and Analysis 6- 3 6- 2 Quality of Analysis Procedure 6- 4 6- 2 Noise Control Treatments 6- 5 6- 3 7. Air Distribution Noise for ... 10. NOISE AND VIBRATION MEASUREMENTS Objective 10-1 10-1 Sound and Vibration Instrumentation 10-2 10-1 Measurement of Noise and Vibration in B...

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 ... Figure 2 -6 shows band sound pressure levels of the NC curves “NC-equivalent” sound level curves as a function (shown earlier in figure 2-1). 2...

Ngày tải lên: 13/08/2014, 05:22

... 32-1090 Table 4 -6. Transmission Loss (in dB) of Stud-Type 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 ... 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 -...

Ngày tải lên: 13/08/2014, 05:22

... 58 59 59 60 61 63 69 76 1200 60 60 61 61 62 63 66 72 81 1400 61 62 62 63 64 65 68 76 86 160 0 62 63 63 64 65 67 70 79 90 1800 64 64 64 65 66 69 73 82 95 2000 65 65 66 66 68 70 74 85 99 2250 66 66 67 68 ... 53 56 59 500 52 52 52 53 53 53 55 57 61 560 53 53 53 54 54 55 56 59 63 63 0 54 54 55 55 55 56 57 61 65 710 55 55 56 56 56 57 59 63...

Ngày tải lên: 13/08/2014, 05:22

... elbows is given below. Octave Band Center Frequencies 63 125 250 500 1k 2k 4k 24x60 1234 568 60 x24 234 56 8 10 24x12 1234 568 16x12 0123 468 Total IL 4 8 12 16 20 26 34 (4) End loss. The end reflection ... 43 BFI. 2 201og(p) 8888888 Eff. Corr. 66 666 66 Total Lw of Fan 104 100 96 95 91 89 85 (2) Diffuser Lw, w/o damper. From suppliers catalog. Table 7 -6. Losses Caused by Duct Elbo...

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 ... tanks, large ducts, and some large pipe stands may not them- selves be noise sources, yet their pipes or their connections to vibrating sources transmit small amounts...

Ngày tải lên: 13/08/2014, 05:22