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Shock and Vibration
Volume 2017, Article ID 7150472, 10 pages
Research Article

Research on the Field Dynamic Balance Technologies for Large Diesel Engine Crankshaft System

College of Mechanical Engineering, Tianjin University of Technology and Education, Tianjin 300222, China

Correspondence should be addressed to Shihai Zhang; moc.361@77ykhsz

Received 15 June 2017; Revised 29 August 2017; Accepted 18 September 2017; Published 18 October 2017

Academic Editor: Mahmoud Bayat

Copyright © 2017 Shihai Zhang and Zimiao Zhang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In order to reduce the unbalancing mass and the accompanying unbalancing vibration of diesel engine crankshaft system, the field dynamic balancing method and its key technologies are presented in the paper. In order to separate the unbalancing vibration signal from the total vibration signal of crankshaft system, the fundamental frequency signal fitting principle based on the least square method was introduced firstly, and then wavelet noise reduction method was applied to improve the signal fitting precision of least square method. Based on the unbalancing vibration signal analysis and assessment of crankshaft system, the influence coefficient method was applied to calculate the value and phase of the equivalent unbalancing mass in flywheel. To easily correct the unbalancing condition of crankshaft system, the unbalancing adjustment equipment was designed based on the flywheel structure. The balancing effect of field dynamic balancing system designed for the large diesel engine has been verified by field experiments.