Applied Research Journal
Volume:3 Issue: 6, Jun 2017

The aim of this work is the calculation of dynamic loads and stresses acting on the rotor of an electrostatically suspended gyroscope in order to predict fatigue. In the first part of this work, forces and momentums that apply on rotor calculated by MATLAB software. In the next part of the work, forces and momentums calculated in previous part simulated on the rotor with the aim of ABAQUS software. The resulting simulations of the rotor, obtained for different rotor speeds, are used for fatigue analysis in order to make an optimal choice of rotor resistant to fatigue. Results validated by that reported in the literature and were in harmony with what reported by other scientists who used numerical simulations.

Nowadays, the requirement for energy is increasing dramatically. That is why the scientists tend to use renewable energy more than ever. The optimum design of energy-consuming appliances and switching to renewable energy such as solar energy play important roles in energy usage reduction. These two important objects are linked together to optimize lithium bromide water solar absorption chiller’s coefficient of performance (COP) by using genetic algorithm. The genetic algorithm is inspired by nature in which can optimum the chiller’s COP by the method of reproduction from the best parents. It should be noted that the experimental methods to optimum the absorbing cycles with due attention to various functional conditions are impossible. Due to optimum the function of absorbing chiller, it is needed to create a thermo dynamical model for absorption chiller and attain the best situation for chiller’s COP. As a result, it is observed that COP value is increased by raising the temperature of high temperature generator.

This paper focuses on the free vibration analysis of thin isotropic oblate Spheroidal shells. The shell properties are assumed to vary continuously through the thickness direction. The analysis is performed following the Finite Element method used the finite element package ANSYS. This method as well as to estimate the natural frequencies and mode shapes for the shells. The obtained results it is found that increase the natural frequencies with increase the thickness of shell and at constant the thickness of base with varying thickness of head the natural frequencies increase.