旋轉機械於運轉中振動力之估測

Estimation of Vibratory Forces Generated by a Rotating Machine under Operating Condition

林東成(Dong-Cherng Lin)

《工業科技與管理學刊》 2卷 (2008/03) Pp. 183-196

https://doi.org/10.6604/JITM.2008.2.11

摘要

本研究係探討反向法在旋轉機械運轉下振動力之估測，即以旋轉機械運轉下之動態反應反向估測振動力。此法係由無輸入項卡爾曼濾波器及一估測器結合而成，其中卡爾曼濾波器可產生更新量，而估測器則利用此更新量以遞迴最小二乘法估算負荷之歷時關係。研究對象為一小型轉子模型系統，為了簡化此物理模型，假設其為單一自由度系統，並實際進行一系列動態振動力估測的實驗，其中該轉子之動態特性採用模態測試方法，由頻率反應函數識別該轉子模型系統的相關參數，以建立其數學模式。研究顯示其振動力估測之結果是準確的，本成果可實際應用於各旋轉機械運轉下振動力之估測，如此將有助於提昇旋轉機械運轉的可靠度。

關鍵字

反向法 ； 卡爾曼濾波器 ； 最小二乘法

並列摘要

This work presents an application of an inverse method to determine the vibratory forces generated by a rotating machine. The vibratory forces are estimated from the measured dynamic responses of a rotating machine under operating conditions through the inverse method. The approach consists of two parts: the Kalman filter without input item and an estimator. The filter is used to generate the innovation sequence. The estimator then computes the onset time histories of the excitation forces by utilizing the residual innovation sequence through a least squares algorithm. The proposed method was used to estimate the vibratory forces of a rotor kit system with different operating conditions. For simplifying the physical model assumed to be single-degree-of-freedom system. The dynamic characteristics of the rotor kit used the modal testing, with frequency response function identifying the system model parameters, and setting its mathematic model. In general, the vibratory forces estimation results reveal that the proposed method accurately identifies the vibratory forces. The technique could be applied to practical forces estimation. The results will improve the reliability of a rotating machine under operating condition.

並列關鍵字

inverse method ； Kalman filter ； least squares algorithm