APPLICATION OF THE OPTIMIZATION METHOD IN THE OBJECTIVES OF THE ANALYSIS OF THE WORKING PROCESS OF SHIP DIESELS

R.A. Varbanets; E.V. Belousov; A.V. Yeryganov; V.O. Maulevych; N.I. Aleksandrovskaya; I.P. Kryzhanovskaya

doi:10.33082/td.2018.2-3.09

R.A. Varbanets Odessa National Maritime University
E.V. Belousov Kherson State Maritime Academy (KSMA)
A.V. Yeryganov Odessa National Maritime University
V.O. Maulevych Odessa National Maritime University
N.I. Aleksandrovskaya Odessa National Maritime University
I.P. Kryzhanovskaya Odessa National Maritime University

DOI: https://doi.org/10.33082/td.2018.2-3.09

Keywords: non-gradient minimization, the Rosenbrock function, diesel engine operation, compression polytrope, functional, the Least-squares method.

Abstract

The article touches upon the possibility of using the method of gradientless n-parametric minimization of Powell'64 in tasks of monitoring the working process of marine diesel engines. There is given an example of finding a global minimum of the Rosenbrock test function. Using the Powell'64 method, the Least-squares functionals in the synchronization and modelling tasks of compression-expansion curves in the working cylinder are minimized. The calculation results of data synchronization for low-speed two-stroke and medium-speed four-stroke marine diesel engines are shown. The synchronization problem can be solved in terms of equation P' = 0 derived for the sector from compression starting to combustion starting in the cylinder. The selection of the boundary conditions for simulation is shown. The advantage of Powell’64 method is its high efficiency for quadratic functionals. As opposed to gradient methods, the Powell'64 method does not require calculating derivatives and is universal for minimizing complex nonlinear general functionals. The original author's algorithm of data synchronization by analyzing the indicator diagrams using the Powell'64 method has been applied in the latest versions of monitoring systems of D4.0H marine diesel engine.

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