CONSTRUCTION OF COMPUTER MODEL OF PROPELLER ELECTRIC PLANT BY GENERATOR – MOTOR SYSTEM

This article discusses the creation of a computer model of a single-circuit propeller electric plant. The first step was to construct a mathematical model of the system. On the basis of this model, a computer model was creat-ed in Matlab and was thereafter checked in a nominal mode. Then we verified the model and actual system by conducting an experiment to adjust the frequency of the propeller motor. The results obtained indicate the cor-rectness of the constructed mathematical and computer models and the effectiveness of this system.

The End of the World by Other Means

The fifth chapter investigates the way in which early avant-garde French cinema takes up the very forms of vegetal sentience and plant-inspired calamity that so terrified Edgar Allan Poe, thereby rewriting the plant once again as an opening onto new worlds. In these films the “inorganic” function of vegetality—as linked to and inspiring new forms of technology and new means of sociability—returns in the visual domain, generating an “electric plant” that retains its utopian dimensions and its power to deprioritize the human. Thus avant-garde vegetal cinema ties the plant once again to a tradition of speculation that extends into the production and creation of new media capable of apprehending and imitating the subtle materiality of vegetal being. The “electric plant” brings to fruition the concept of cinema as a form of pure movement. The French experimental cinema discussed in this chapter reinvents the project of imagining vegetal worlds, this time in cinematic contexts. While filmmakers and theorists Jean Epstein (1897–1953) and Germaine Dulac (1882–1942) turn with excitement toward vegetality, other contemporaneous artists, including Colette (1873–1954), re-inscribe the plant into the domain of ordinary experience and human pathos.

Ship electromotive system with common DC buses

The universal structure of the ship’s electromotive system with common DC (direct current) buses is proposed. It is shown that this structure allows: improving operational, energy, environmental and massdimensional characteristics of the motive system; increasing the reliability and survivability of the ship’s electric power system; braking propellers with the transfer of braking energy to consumers of its own needs or to the energy storage; redistributing energy between propulsion electric machines with the dissipation of braking energy in the working environment; providing fuel economy in the range of 12^15 % depending on the modes of operation of the ship in comparison with the known structures of electric propulsion systems. Analytical dependences that allow choosing the voltage level of the electric generator and coordinating it with the level of nominal voltages on the propeller motors and other load connected to the voltage inverters are obtained. A function for the analytical description of the limiting reversible mechanical characteristic of the propeller is synthesized. The mathematical description of the braking and reverse modes of the propulsion electric plant is given. Synthesis of algorithms of control of propulsion electric plant with two propellers at braking and reverse is carried out. The time diagrams of the torque, speed and power changes at each of the propellers for the proposed algorithm of braking and reverse of the propeller motors are presented.