Investigation on the influence of load of noise from brush cutter on gardeners

Through the field measurement of noise level of 18 gardeners operating the knapsack brush cutter and the shoulder-hanging brush cutter, we calculated the noise exposure metering of every working day during gardeners operating the trimmer line, two-tooth cutting tools, four-gear cutting tools and forty-tooth cutting tools. According to gardeners' working habits, we tested the noise level made by 2 different brush cutters when cutting plants, in order to work out the sound level and sound frequencies when the two brush cutter being operated at a no-load running, low speed and high speed operation. Meanwhile, brain waves of these gardeners were measured and the average power spectra density ratio R between brain wave band α and band β was compared, so that we can analyze the influence of their mental load and make some positive innovations and further suggestions about how to control unnecessary noise for greening department.