Nonlinear Guidance Law with Finite Time Convergence Considering Control Loop Dynamics

Iman Mohammadzaman; Hamiderza Momeni

Volume 8, Issue 2 , September 2011, Pages 69-75

  In this paper a new nonlinear guidance law with finite time convergence is proposed. The second order integrated guidance and control loop is formulated considering a first order control loop dynamics. By transforming the state equations to the normal form, a finite time stabilizer feedback linearization ...  Read More

Process Improvement of Experimental Measurements Using D-optimal Models

Farid Shahmiri; Mahsa Baghban Salehi

Volume 8, Issue 2 , September 2011, Pages 77-86

  In this paper, the application of D-optimal models, as an alternative to response surface models (RS models) for design of experiment (DOE) was examined. Two D-optimal models for tilt-rotors in the wind tunnel experiment, as a form of quadratic functions, were generated based on a chosen optimality criterion. ...  Read More

Midcourse Trajectory Shaping for Air and Ballistic Defence Guidance Using Bezier Curves

Alireza Mohamadifard; Abolqasem Naghash

Volume 8, Issue 2 , September 2011, Pages 87-95

  A near-optimal midcourse trajectory shaping guidance algorithm is proposed for both air and ballistic target engagement mission attributes for generic long range interceptor missile. This guidance methodology is based on the maximum final velocity as the objective function and maximum permissible flight ...  Read More

An Experimental Study of Compound Control Method around a Cylinder

Soghra Rezazadeh; H. Masumi; E. Esmaeilzadeh

Volume 8, Issue 2 , September 2011, Pages 97-105

  In this work, the compound flow control method (passive and active) has been described. EHD actuators as wire-plate (active) and splitter plate (passive) were coupled and applied to control fluid flow and heat transfer around cylinder in cross flow. Investigation consists of the interaction between electric ...  Read More

A Bayesian Networks Approach to Reliability Analysis of a Launch Vehicle Liquid Propellant Engine

A. M. Akhlaghi; H. Naseh; Mehran Dr. MirShams; Saeid Irani

Volume 8, Issue 2 , September 2011, Pages 107-117

  This paper presents an extension of Bayesian networks (BN) applied to reliability analysis of an open gas generator cycle Liquid propellant engine (OGLE) of launch vehicles. There are several methods for system reliability analysis such as RBD, FTA, FMEA, Markov Chains, and etc. But for complex systems ...  Read More

A Control Method Based on Dynamic Response of the Airplane for Compensation of Pilot-Induced Oscillations: Benefits and Flaws

Neda Eskandari Naddaf; Amir AliAkbarKayyat

Volume 8, Issue 2 , September 2011, Pages 119-125

  Pilot-Induced Oscillation (PIO) is an unwanted, inadvertent phenomenon that has the ability to damage the aircraft completely. This paper suggests a novel control method that can damp PIO after predicting its occurrence. The specific point of this control algorithm is that it contains a preprocessor ...  Read More

Flow Field Characteristics of an Aerospike Nozzle Using Different Turbulence Models

sahar noori; Ava Shahrokhi

Volume 8, Issue 2 , September 2011, Pages 127-133

  To improve the calculation of the flow properties of an aerospike nozzle, different turbulence models were investigated in this study. The primary shape of the nozzle plug is determined through utilizing an approximate method. The flow field is, then, simulated using the Navier-Stokes equations for compressible ...  Read More