Volume 21, Issue 5
مرور بر اساس
ارسال های اخیر

Analytic Investigation of the Effects of Condensation Shock on Turbulent Boundary Layer Parameters of Nucleating Flow in a Supersonic ConvergentDivergent Nozzle
(Sharif University of Technology, 20141001)Under the influence of intense expansion and supersonic acceleration of the steam flow in the divergent channel, the instability of the flow intensifies. In the lack of external surfaces, this nonequilibrium state causes ...

INTELLIGENT PHEROMONE UP GRADATION MECHANISM THROUGH NEURAL AUGMENTED ANT COLONY OPTIMIZATION (NaACO) META HEURISTIC IN MACHINE SCHEDULING
(Sharif University of Technology, 20141001)The pheromone update phase in Ant Colony Optimization (ACO) has been addressed by various researchers in the context of scheduling problems. Various artificial intelligence (AI) techniques have also been used to investigate ...

Analytical investigation of simultaneous effects of friction and heating to a supersonic nucleating Laval nozzle
(Sharif University of Technology, 20141001)In supersonic water vapor flows of low pressure turbines, the nucleation phenomena and consequent condensation is commonly observed. Internal heat transfer which is caused by phase change is strongly irreversible and has ...

Pseudospectral Optimal Control of Active Magnetic Bearing Systems
(Sharif University of Technology, 20141001)In this paper the optimal control framework is formed to control rotoractive magnetic bearing (AMB) systems. The multiinput–multioutput nonaffine model of AMBs is well established in the literature and represents a ...

A new fractional analytical approach for treatment of system of physical models by using Laplace Transform
(Sharif University of Technology, 20141001)In this study, the homotopy perturbation transform method (HPTM) is performed to give approximate and analytical solutions of the first order linear and nonlinear system of time fractional partial differential equation. ...

Performance of piezoelectrically actuated micropump with different driving voltage shapes and frequencies
(Sharif University of Technology, 20141001)The effects of driving voltage waveform and frequencies on the performance of piezoelectrically actuated micropump are investigated in details. A full threedimensional piezoelectric micropump was modeled numerically and ...

Forward Kinematic Problem of Three 4DOF Parallel Mechanisms (4PRUR1, 4PRUR2 and 4PUU) with Identical Limb Structures Performing 3T1R Motion Pattern
(Sharif University of Technology, 20141001)This paper investigates the forward kinematic problem of three 4DOF parallel mechanisms performing three translations and one rotation motion referred to as Schönfliesmotion. The kinematic arrangements of the mechanisms ...

Twophase natural convection of SiO2water Nano fluid in an inclined square enclosure
(Sharif University of Technology, 20141001)Natural convection of a Nano fluid consisted of water and SiO2 in a square enclosure cavity have been studied numerically. The sidewalls are maintained at different constant temperatures and the other walls are thermally ...

Normalized Miss Distance Analysis of SingleLag Optimal Guidance Lawwith Radome Effect, Saturation, and FifthOrder Control System
(Sharif University of Technology, 20141001)This paper deals with miss distance analysis of singlelag optimal guidance law (OGL) using linearized equations of motion in normalized form. The radome refraction error, acceleration limit, constant target acceleration, ...

Theoretical and experimental investigation of density jump on an inclined surface
(Sharif University of Technology, 20141001)The density jump on an inclined surface is analyzed using integral method by applying mass and momentum conservation equations. The jump occurs in a twolayered fluid flow, in which the upper layer is stagnant and very ...

On Determination of Mode Shapes of Linear Continuous Systems
(Sharif University of Technology, 20141001)Determination of mode shapes of vibrating system is an important step in vibration analysis. A procedure to determine the mode shapes of linear continuous systems based on the concept of normal equation is presented. This ...

CFD Based Optimization of the Mixture Formation in Spark Ignition Direct Injection CNG Engin
(Sharif University of Technology, 20141001)This paper describes the optimization of combustion chamber geometry and injection timing of new generation of EF7 engine that CNG is directly injected to the combustion chamber, with the aim of providing the best mixture ...