CAJ | 학술논문

针对往复压缩机振动信号的强非平稳特性，提出了一种基于有理Hermite插值的局部均值分解(Local mean decomposition, LMD)方法。结合有理Hermite插值法的保形特性和曲线形状随参数可调特性，以其构建极值点间局部包络曲线。提出以极值对称点为依据的局部包络线优选方法，进而提高局部均值与包络估计的拟合逼近精度。给出了有理 Hermite插值LMD方法的算法与流程。利用仿真数据，通过与不同插值方法比较，验证了有理Hermite插值LMD方法拟合逼近性能的优越性。以往复压缩机轴承故障振动信号为研究对象，应用有理Hermite插值LMD方法实现了轴承间隙大故障的准确诊断，验证了该方法对强非平稳信号的适用性。
침대왕복압축궤진동신호적강비평은특성，제출료일충기우유리Hermite삽치적국부균치분해(Local mean decomposition, LMD)방법。결합유리Hermite삽치법적보형특성화곡선형상수삼수가조특성，이기구건겁치점간국부포락곡선。제출이겁치대칭점위의거적국부포락선우선방법，진이제고국부균치여포락고계적의합핍근정도。급출료유리 Hermite삽치LMD방법적산법여류정。이용방진수거，통과여불동삽치방법비교，험증료유리Hermite삽치LMD방법의합핍근성능적우월성。이왕복압축궤축승고장진동신호위연구대상，응용유리Hermite삽치LMD방법실현료축승간극대고장적준학진단，험증료해방법대강비평은신호적괄용성。
According to the strongly non-stationary characteristic of reciprocating compressor vibration signal, a local mean decomposition (LMD) method based on rational Hermite interpolation is proposed. Due to the excellent characteristic of shape preservation and characteristic of adjustable curve shape with parameter, Hermite rational interpolation method is used to construct envelope curves between extreme points. In order to improve the envelope approximation accuracy of local mean and envelope estimation, the local envelope curves optimization method which taken extreme value symmetry points as criterion is proposed. Algorithms and processes of rational Hermite interpolation LMD method are given. Compared with results of different interpolation methods for simulation data, superiority of this method is proved. Taken vibration signal of reciprocating compressor bearing fault as research objects, oversized bearing clearance fault is diagnosed accurately by this method, and the applicability of this method for strongly non-stationary signal is verified.