Ministry of digital technologies of the republic of
III. CHAPTER. LIFE SAFETY
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III. CHAPTER. LIFE SAFETY
3.1. Adjusting the noise level and measure Noise level normalization - noise to a person negative effect to reduce directed main from events one is counted. The noise a person to health effect is frequency connection that it was because of one noise octave strip for separately permission done noise level specified (GOST 12.1.003-83). The noise the highest permission done low frequencies for, low resolution done level while high frequency noises for acceptance done. For example, most small sound pressure theoretical and scientific affairs executable the work places for defined is, it is average geometric frequency 8000 Hz when it is 30 dB done. Man ear from 16 Gs. to 20000 Gs has been sound frequencies to hear ability have. Human to hear ability each different frequency to sounds one different not, 1000 - 4000 Gs frequency has been sounds good acceptance , 16... 100 Gs frequency sounds significant level hears _ Degree one different is one _ different to frequency have has been sounds one different acceptance will be done . Sanitary in norms (SN-245-91, GOST 12.1.003-85. SN-3223-85) of noise permission done amount level determined is the sound frequency depends and 8 octaves amounts with is evaluated. Noise level executable of work in particular depend. For example, industry enterprises constant the work in place and work release in the fields the following noise level quantity permission will be: 63 Gs. at -103 Db, 25 Gs - 96 Db., 250 Gs. - 91 Db., 500 Gs -88 Db., 1000 Gs. - 86 Db., 2000 Gs. - 83 Db., 4000 Gs. - 81 Db. and 80 Db at 8000 Gs. Noise level and character looking, noises man to the organism each different effect shows. Man to his ear audible sounds to power depending on 3 parts to be can _ The first from hearing to sound pressure tangible level was 40 dB intermediate in nature less occurring external environment signals that it was for, hearing members _ this signals feel ability will be much lower. Second 41 dB to 90 dB per part has been useful (pleasant) and useless (unpleasant) sounds enters. To this simple a ghost from the sound to the loudest radio and music voices and vital noises enters. Third 91 dB to 130 dB per part to hear to members pain emits level sounds enters 145 dV from more than has been 51 sound levels man of the ear curtain tear can . The noise norms when specifying two from the method used: 1) noise border spectrum based on normalization; 2) noise dV sound level through normalization _ The work in places constant noises for the first method main normalization method is considered In this noise pressure levels 8 octaves in intervals medium geometric frequencies 63, 125, 250, 500, 1000, 2000, 4000, 8000 Gs in is normalized, i.e in frequencies sound pressure level in dB value is taken [12]. From noise to protect methods differently being the first in line noise to the source and noise level depends without is selected. Noise a person to health and the work ability negative the effect one method through eliminate reach difficult that it was because of, in practice complex of methods is used. Such complex method own into the following events combines: - noise his at the source reduce; - noise spread direction change; - of the building acoustic situation improve; - work release buildings and plots location reasonable planning; - noise spread on the way reduce. This methods inside noise his at the source reduce the most efficient road is considered The noise come to exit main reason car and mechanism or his some parts movement as a result in the air elastic waves movement to the body brings _ Such of waves harvest to be take coming moving parts own in turn mechanical, aerodynamic, hydrodynamic and electrodynamic to species being to look to the goal is appropriate . Car and of mechanisms work principles descriptions and noise to issue take coming factors each different will be Noise harvest to be reason will be main one clause is all for is common. This is a car and mechanisms in use, repair standard requirements compliance is to do Note done events done in raising road placed uncertainties noise exit main factor is considered. |
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