An advanced guidance law is developed for reentry phase of a reentry vehicle. It can achieve small miss distance and desired impact attitude angle, simultanceously. To meet this requirment a guidance law based on the fuzzy logic approach is developed. It is partitioned into three stages. This guidance law does not require linearization of missile engagement model. Line-of-sight and flight path ...

the application of a flight simulator with six degree of freedom (6dof)) in design and analysis of rocket systems is essential. the calibration of a 6dof flight simulator is a challenging problem. this paper focuses on the calibration of a flight simulator and intends to answer the following questions: 1) does experimental design have significant impact on calibration quality? if so, which expe...

Today’s airspace environment is congested and complex. The enroute environment is a tangled web of victor airways and jet routes connecting the multitude of radio navigation aids sprinkled all over the world and especially the US. The terminal area environments are highly congested with air traffic and requires precise aircraft control by pilots and ground controllers. This situation is even mo...

introduction: this paper investigates the relationships between extraversion, neuroticism and psychoticism dimensions with brain / behavioral systems. methods: randomly selected 128 female university students in tehran completed gray-wilson personality questionnaire and eysenck personality questionnaire-reversion, using pearson correlation coefficiency and regression analysis, result: the resul...

In order to fly, insects require flight muscles that constitute at least 12 to 16% of their total mass, and flight performance increases as this percentage increases. However, flight muscles are energetically and materially expensive to build and maintain, and investment in flight muscles constrains other aspects of function, particularly female fecundity. This review examines ways in which ins...

The six-degree equations of flight in their classic form do not provide a proper physical perception due to a number of interferences. Nor do they render visible the important role of attack angles. In this study, attempts have been made to develop a complete set of 3D acceleration equations from the equations of normal and tangential acceleration αN=vωv, αt=v ̇. For this purpose, a coordinate s...

Let X be an N -parameter additive Lévy process in IR with Lévy exponent (Ψ1, · · · ,ΨN ) and let λd denote Lebesgue measure in IR . We show that E{λd(X(IR+ ))} > 0 ⇐⇒ ∫ IR N ∏ j=1 Re ( 1 1 + Ψj(ξ) ) dξ < ∞. This was previously proved by Khoshnevisan, Xiao and Zhong [1] under a sector condition.

time-of-flight diffraction method (tofd) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves. although tofd can measure through-wall length of defect accurately, this method is not capable of measuring horizontal defect size. in this paper, a new tofd method for evaluating horizontal planar defects is presented. the finite...

We study the territory covered by N Lévy flights by calculating the mean number of distinct sites, ^SN(n)&, visited after n time steps on a d-dimensional, d>2, lattice. The Lévy flights are initially at the origin and each has a probability Al 2(d1a) to perform an l -length jump in a randomly chosen direction at each time step. We obtain asymptotic results for different values of a . For d52 an...