The fuzzy logic concept provides a natural way of dealing with problems in which the source of imprecision is an absence of sharply defined criteria rather than the presence of random variables. The fuzzy approach considers cases where uncertainties play a role in the control mechanism of the concerned phenomena. Fuzzy modeling includes fuzzification, fuzzy analysis and defuzzification. In this...

An analysis of the strati®cation decay in thermally strati®ed vertical cylindrical cool storage systems is presented using a one dimensional conjugate heat conduction model. The degree of thermal strati®cation depends upon the length to diameter ratio, wall thickness to length ratio, the thermo-physical properties of the material of the storage tank, the type and thickness of the insulation and...

Chaotic features of the macro-instability (MI) of flow patterns in stirred tanks are studied in this paper. Datasets obtained by measuring the axial component of the fluid velocity and the tangential force affecting the baffles are used. Two geometrically identical, flat-bottomed cylindrical mixing tanks (diameter of 0.3m) stirred with either pitched blade turbine impellers or Rushton turbine i...

Hydrogen may substitute traditional hydrocarbon fuels in propeller and jet aircraft. In the case of propulsion, use combustion engines is preferable to fuel cells plus electric motors. The conversion efficiency from chemical mechanical energy at larger with cells, but propulsion system also larger, addition heavier. Fuel have a better appeal for novel urban air mobility solutions. Hybridization...

The seismic analysis of ground-supported cylindrical steel tanks subjected to lateral harmonic displacement loadings has been carried out. This paper numerically evaluates the structural response various tank geometries due resonant sloshing. numerical investigation is performed using a two-way fluid interaction approach that couples computational dynamics with finite element transient analysis...

In the present work, a novel Laser Directed Energy Deposition (LDED) process planning methodology is proposed to build dome structure with variable overhang angles. Overhang structures different angles were built where maximum angle of 35° can be used without and compromise. The thin-wall hemispherical using developed shows deviation 2% respect diameter original CAD model data. study paves way ...

A description of a new design vibrating machine for strengthening the surface plastic deformation cylindrical long parts, in particular stabilizers wheeled carriages railway cars, is given. The main and technological parameters process vibration – centrifugal these parts are outlined. influence this hardening on such basic indicator processing as depth experimentally investigated samples from 4...

Preliminary note The paper presents an analysis of annual variations of temperature and the corresponding saturation pressure of saturated liquid propane in a mounded cylindrical tank used for liquefied petroleum gas (LPG) storage. A mathematical model has been established based on a finite volume method. Boundary and initial conditions have been assumed for the Croatian climate. Simulations ha...