NOISE AND VIBRATION CONTROL Episode 7 potx

... 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 Band Center ... isolators and their range of static de- flections and natural frequencies as applied to two equipment categories (rotary and reciprocating) and two equipment locations (non...

Ngày tải lên: 13/08/2014, 05:22

... characteristics and the sound pressure level data have become detached, and the noise control analyst or engineer has no concrete data for designing noise control treat- ments. Sones and phons are ... this manual, and their use for noise control purposes is of little value. When offered data in sones and phons, the noise control engineer should request the original o...

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

... Characteristics of Noise Sources 7- 2 7- 1 Specific Characteristics of Noise Sources 7- 3 7- 1 Control of Fan Noise in a Duct Distribution System 7- 4 7- 3 Procedure for Calculating Noise Control Requirements ... 10. NOISE AND VIBRATION MEASUREMENTS Objective 10-1 10-1 Sound and Vibration Instrumentation 10-2 10-1 Measurement of Noise and Vibration in Buildin...

Ngày tải lên: 13/08/2014, 05:22

... 80 100 -3 -4 -4 -4 -4 -4 -4 -4 -4 200 -5 -6 -7 -7 -7 -7 -7 -7 -7 320 -6 -7 -8 -8 -9 -9 -9 -9 -9 500 -7 -9 -10 -11 -11 -11 -11 -11 -11 70 0 -8 -10 -12 -12 -12 -13 -13 -13 -13 1000 -8 -11 -13 -13 -14 -14 -15 -15 -15 2000 -9 -12 -15 -16 - 17 ... 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...

Ngày tải lên: 13/08/2014, 05:22

... -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 -29 4-2

Ngày tải lên: 13/08/2014, 05:22

... 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 plaster ceiling ... (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...

Ngày tải lên: 13/08/2014, 05:22

... 68 68 69 70 72 75 82 97 1 17 3150 69 70 71 72 74 77 84 101 124 3500 70 71 72 73 75 79 87 106 131 4000 71 72 73 75 77 82 91 112 141 4500 72 73 75 76 79 85 94 ll9 151 5000 73 75 76 78 81 87 98 125 ... 161 5500 74 76 77 79 83 89 101 131 170 6000 75 77 79 81 84 92 105 1 37 180 6500 76 77 79 82 86 94 108 143 189 70 00 77 78 81 83 88 96 111 149 199...

Ngày tải lên: 13/08/2014, 05:22

... the architect and engineer to problems of noise and vibration. This is an important first step to noise control. Without awareness, the noise problem is ignored in the design, and later problems ... sources, fan noise will control the noise level in the low frequency range, air terminal units will control in the mid-frequency range, and air outlets will control in th...

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