基于有限元法纸机压榨辊振动声辐射研究

On the Sound Radiation of the Press Roll Vibration of Paper Machine Based on FEM

对纸机压榨部的压榨辊进行了振动声辐射分析,利用有限元法对压榨辊进行了振动声辐射研究,主要包括压榨辊的动力学分析及声辐射分析.通过计算结果可知:若该压榨辊的工作车速为450,m/min,则压榨辊的运行是平稳的,并可长期稳定的运行.压榨辊的噪声密集区主要集中在场点网格的中部区域,场点网格上的声压级在大多数频率下都超过了85,d B;5个测量点的声压级曲线具有基本一致的变化趋势,当频率介于0~50,Hz时,声压级的两个最大值与被激发出的压榨辊的弯曲固有频率是相一致的,压榨辊质量的不平衡是产生声辐射的主要原因.

Sound radiation analyses of the press roll based on FEM were accomplished by using acoustic software, which included the dynamic analyses and sound radiation study of the press roll. According to computing results, at the designed working speed of 450,m/min, the press roll would work with long-term stability. The intense sound pressure is mainly in the middle region of the field point mesh, reaching 85,dB at most frequencies. The sound pressure curve was almost the same atfive measured points. When the frequency range was 0-50,Hz, the maximum sound pressure curve was consistent with the natural bending frequency of the press roll, and the imbalance quality of the roll was the main cause of the sound radiation.