基于统计能量法的组合式金刚石圆锯片声压级研究

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

组合式金刚石圆锯片在进行硬脆性材料加工时容易产生振动并辐射噪声,基于统计能量法(SEA)建立花岗石锯切模型,考虑系统实际工程中的模态密度、内损耗因子、约束、激励及辐射区等条件,对组合式金刚石圆锯片噪声辐射水平进行频域历程的定量估计,并与现场实测结果进行对比。结果表明:基体外径460~1584 mm、厚度4.0 mm的9片组合式金刚石圆锯片的高频区声压级范围为88.3~102.3 dB,其峰值在高频区4000 Hz处;且1~5片组合式金刚石圆锯片的高频区声压级范围为79.5~99.2 dB,声压级随组合片数增加而不断增大,但整体递增幅度随片数增加而减小;厚度3.5~5.5 mm的组合式金刚石圆锯片的高频区声压级范围为86.1~104.7 dB,声压级随组合片厚度增加而不断增大,且4000 Hz峰值处的声压级有5.7 dB的差值。试验和模型结果较为吻合,证明了所建立的统计能量分析模型对锯片高频噪声声压级计算的可信性。

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.