Open AccessMETHOD OF NON-GRADIENT MINIMIZATION POWELL'64 IN THE TASKS OF MONITORING OPERATION OF MARINE DIESEL ENGINES
Author(s) -
Alexey Valerievich Yeryganov,
Vladyslav Olegovych Maulevych,
Roman Varbanets,
Evgeniy Ivanovich Zholtikov,
Valeriy Georgievitch Ivanovskiy,
Yuriy Nickolaevich Kucherenko
Publication year - 2017
Publication title -
vestnik astrahanskogo gosudarstvennogo tehničeskogo universiteta. seriâ: morskaâ tehnika i tehnologiâ
Language(s) - English
Resource type - Journals
eISSN - 2225-0352
pISSN - 2073-1574
DOI - 10.24143/2073-1574-2017-4-49-61
Subject(s) - diesel fuel , minification , synchronization (alternating current) , quadratic equation , diesel engine , cylinder , nonlinear system , computer science , combustion , function (biology) , parametric statistics , control theory (sociology) , mathematics , automotive engineering , mathematical optimization , engineering , mechanical engineering , geometry , artificial intelligence , physics , computer network , channel (broadcasting) , statistics , control (management) , quantum mechanics , evolutionary biology , biology , chemistry , organic chemistry
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.