旋转圆柱壳体切削噪声的输入功率分析

Power input analysis of circular-cylndrical shell's cutting noise

切削噪声研究所面临的首要困难是确定任意切削位置处的切削噪声功率以及切削过程中各个声辐射体对总体切削噪声的贡献。本文以相关输入下非保守耦合系统的统计能量分析为基础,提出了用于解决这些问题的输入功率分析原理(PIA)并对该原理进行了详细的论述,对于该原理所涉及参数的估计理论或测量技术以及建模等其他重要问题也进行了讨论和说明。作为PIA理论的一个应用实例,本文对切削一长700mm,厚10mm,直径300mm的圆柱壳体时的噪声进行了研究。研究结果表明,输入功率分析法是切削噪声研究的一个有效工具,也可以有效地应用于其他耦合系统的能量分析。

The most difficult things in study of cutting noise are to determine the sound power respect to any cutting position and the noise contribution from one radiator to the total cutting noise. In this paper, based on Statistical Energy Analysis for non-conservatively coupled systems under correlative excitations, Power Input Analysis (PIA) method is developed to deal with such difficulties. The detail theory of PIA is given. The techniqes for evaluating or measuring the concerned parameters, as well as PIA modeling, are discussed, too. As an application of PIA, cutting noise generated in turning the inner wall of a cylindrical shell with 300 mm in diameter, 700 mm in length and 10 mm in thichness is studied. Results show that PIA is a powerful tool in the study of cutting noise from cutting systems with higher modal density, as well as in the study of the other coupled complicated systems under en her correlative or non-correlative excitations.