Simulatoin of behavior dynamics of management ship stability during changable regime of sailing

Abstract

System Dynamic SimulatingModeling is one of the most appropriate and successful scientific dynamics modeling methods of the complex, non -linear, natural, technical and organizational systems. The methodology of this method, together with use of digital computer, showed its efficiency in practice as very suitable means for solving the problems of management, of behavior, of sensibility, of flexibility of behavior dynamics of very complex systems. All this is made by computer simulating, i.e. "in laboratory", which mean without any danger for observed realities.The paper deals with dynamic analysis of automatic ship steering gear systems utilizing complex controls that function according to the principle of proportional, integral and derivation regulators. The analysis involves a system dynamic simulation modeling methodology as one of the most suitable and effective means of dynamic modeling of complex non-linear, natural, organizational and technical systems. The paper discusses system dynamics simulation models being used in qualitative (mental-verbal, structural) and quantitative (mathematical and computer) simulation models on ships equipped with trailing steering systems and PID regulator. Authors suggest using the presented models for designing and constructing new steering systems, for diagnosing existing constructions and for education in Universities.

Extracting Classical Trajectories from Atomic Spectra

“…Periodic orbit theory [1] and its variants allow one to learn about the actions and stabilities of classical orbits from a system's quantum density of states (though it is typically used the other way around). There are only a few methods that can be used to find the trajectories themselvestheir position as a function of time-and the methods are either indirect [2] or require knowledge of the quantum wave functions in addition to the spectrum [3,4]. We present here the results of a new study in which semiclassical methods are used to reconstruct a trajectory from experimental spectroscopic data.…”