Study on SPL of multi-blade block cutter based on statistical energy method

Combined diamond circular saw blade was easy to produce vibration and radiate noise when processing hard and brittle materials. Based on the statistical energy analysis (SEA), a granite sawing model was established. Considering the conditions of modal density, internal loss factor, constraint, excitation and radiation area in the practical engineering of the system, the noise radiation level of the combined diamond circular saw blade was estimated quantitatively in the frequency domain, and compared with the field measurement results.The results show that the sound pressure level of the nine-piece combined diamond circular saw blade with outer diameter of 460 to 1584 mm and thickness of 4.0 mm is 88.3 to 102.3 dB in the high frequency range, and the peak range is 4000 Hz in the high frequency range. And the sound pressure level of the high-frequency range of 1 to 5 combined diamond circular saw blades is 79.5 to 99.2 dB, and the sound pressure level increases with the number of combined sheets, but the overall increasing amplitude decreases with the increase of the number of slices. However, the high-frequency sound pressure level range of the combined diamond circular saw blade with thickness of 3.5 to 5.5mm is 86.1 to 104.7 dB, and the sound pressure level increases with the thickness of the composite sheet, and the sound pressure level at the peak of 4000 Hz has a difference of 5.7 dB. The experimental results are in good agreement with those of the model, which proves that the statistical energy analysis model can be used to calculate the sound pressure level of high frequency noise of saw blades.