Open AccessNew Method for Building Vector of Diagnostic Signs to Classify Technical States of Marine Diesel Engine by Torsional Vibrations on Shaft-Line
Author(s) -
Do Duc Luu,
Cao Duc Hanh,
Nguyen Xuan Tru
Publication year - 2021
Publication title -
sustainable marine structures
Language(s) - English
Resource type - Journals
ISSN - 2661-3158
DOI - 10.36956/sms.v2i2.330
Subject(s) - cylinder , maxima and minima , vibration , computer science , state (computer science) , diesel engine , space (punctuation) , marine propulsion , signal (programming language) , line (geometry) , propulsion , acoustics , engineering , mechanical engineering , mathematical analysis , physics , algorithm , geometry , mathematics , automotive engineering , aerospace engineering , programming language , operating system
Vector of diagnostic signs (VDS) using torsional vibration (TV) signal on the main propulsion plant (MPP) is the vector of z maxima (or minima) values of the TV signal in accordance with the cylinder firing orders. The technical states of the main diesel engine (MDE) include R= z+1 classes and are presented in z-dimensional space coordinate of VDS. The presentation of Dk, k=1÷R using z diagnostic signs (Vi, i=1÷z) is nonfigurative and quite complicated. This paper aims to develop a new method for converting VDS from z-dimensional to 2-dimensional space (two-axes) based on working angle of a cylinder. The new vector of diagnostic signs VN is constructed as the geometrical grand total of all VDS:, where; ; and. The proposed model is useful for presenting a technical state Dk in two-dimensional space (x, y) in a visualization way. The algorithm and simulation software are designed for the DME 6S46-MCC, installed on the motor vessel (MV) 34000DWT. The R technical state classes are drawn separately and visually in the Descartes. The received results are valuable to improve smart diagnostic system for analyzing normal/misfire states of cylinders in operation regimes