Method for calculating the height difference between the two rail tops of quayside container crane runway based on improved AMD

CHEN Qing-lan, HU Xiong, WANG Bing
(College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, China)

Abstract: Aiming at the problem of extracting the ultra-low frequency trend in the angle vibration signal with large amount of data during the process of calculating the height difference between the two rail tops of quayside container crane runway, an improved analytical mode decomposition(AMD) method combining the original AMD and the moving average algorithm was proposed. The ultra-low frequency trends of the simulated signal and the actual measured signal extracted by the improved AMD method and the original AMD method were compared, which proved that the improved AMD method can eliminate the adverse effect of random noise in the results. The improved AMD method, wavelet packet decomposition (WPD) method and empirical mode decomposition (EMD) method were applied to the simulated signals and the actual measured signals with different parameters and the performances of the three methods were compared. The results indicate that the improved AMD method has the best performance among the three methods. The calculating method based on the improved AMD can calculate the height difference between the two rail tops of quayside crane runway during the monitoring interval accurately and efficiently, and it is very suitable for obtaining the long-term change of the height difference.

Key words: quayside container crane; height difference between the two rail tops of crane runway; analytical mode decomposition(AMD); ultra-low frequency trend