This thesis was formed in order to investigate the distribution of noise level in skidder Woody 140 cabin. Noise was measured by the indicator of A-weighted equivalent sound pressure level (LAeq) and C-weighted peak sound pressure level (LCpeak), both at idling speed as well as working rotations of engine. The findings show that the intensity of the noise in the cabin distributes in a non-homogenous way irrespective of the indicator by which to measure noise, and irrespective of the number of rotations of skidder engine. The highest and lowest measured values, according to the noise indicator Laeq, appear at various measuring stations in the cabin, all at various rotations of engine. The highest values of noise, according to the indicator LCpeak at various rotations of engine, coincide. The highest deviations are calculated in the working rotations of engine, where the measured values for the indicator LCpeak varied up to 6.41 dB(C), while for the indicator LAeq up to 5.23 dB(A). Within the area of measuring noise, standardized by SIST EN ISO 9612:2009, the differences of noise levels are greater than expected deviation of 1 dB. From the gathered results we can conclude that a microphone placement can significantly affect the assessment of exposure to noise, and that the microphone needs to be placed as close to the ears of workers as possible.
|
