Data given in Figs. 3 and 4 show that the influence of WT generated noise when wind speed v=6 m/s to the total noise is reached at 250 m distance to WT rotor axis, whereas at wind speed v=12 m/s, this distance reduces to 100 m/s. Thus at wind speed 12 m/s, WT generated acoustic noise insignificantly influences the requirements of hygiene norms.
Research data reveals that in time sequence, the intensity of WT generated noise changes. In some time moments, it may be hardly audible, whereas in other times, rather intensive. It may be observed (Fig. 5) that in certain time periods, noise intensity (LAFmax) is higher than the equivalent level (LAeq), at the same time, it may be much lower (LAFmin) than the equivalent level (LAeq). The variation of sound level is defined not only in the equivalent level (LAeq) investigated moment.
Data given in Figs. 3 and 4 show that the influence of WT generated noise when wind speed v=6 m/s to the total noise is reached at 250 m distance to WT rotor axis, whereas at wind speed v=12 m/s, this distance reduces to 100 m/s. Thus at wind speed 12 m/s, WT generated acoustic noise insignificantly influences the requirements of hygiene norms.Research data reveals that in time sequence, the intensity of WT generated noise changes. In some time moments, it may be hardly audible, whereas in other times, rather intensive. It may be observed (Fig. 5) that in certain time periods, noise intensity (LAFmax) is higher than the equivalent level (LAeq), at the same time, it may be much lower (LAFmin) than the equivalent level (LAeq). The variation of sound level is defined not only in the equivalent level (LAeq) investigated moment.
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