AiMT Volume 3 (2008), Issue 1

QUANTITATIVE SAFETY RISK REQUIREMENTS FOR SMALL ARMS AND AMMUNITION

R. Jankových, J. Majtaník

Implicit in a discussion of the acceptability of a safety level for arms and ammunition is an understanding of risk. The method of requirements definition of arms and ammunition safety risks introduced in the paper enables to unambiguously identify the area of unacceptable risk that could result in arms or ammunition failure with serious consequences.

Keywords: quality of arms and ammunition, safety of arms and ammunition, safety risk requirements

Page: 5 - 16

ARMAMENT OF COMBAT HELICOPTERS

F. Ludvik

The paper deals with the armament of combat helicopters being effective weapons of contemporary air forces in the army's armament. The main attention is paid to the categories of guided anti tank missiles. These missiles are determined for the battle with armoured targets when supporting the land forces.

There are briefly mentioned individual categories of these types of guided missiles. The basic tactical technical requirements are also presented in this paper.

Keywords: Armament, combat helicopter, guidance system, weapon

Page: 17 - 31

RELIABILITY MODELLING OF AUTOMATIC GUN WITH PYROTECHNIC CHARGING

Z. Vintr, D. Valis

This article deals with modelling and analysis of reliability of complex systems that use one-shot items during its operation. It includes analyses of an impact of reliability of used one-shot items on resulting level of reliability of the system as a whole. Practical application of theoretical knowledge is demonstrated on an example of a model of reliability of ZPL-20 aircraft gun that was used for optimization of the gun's design during its development and designing.

Keywords: Complex systems, one shot items, reliability analysis, weapon

Page: 33 - 42

IMPROVED ICE ACCRETION PREDICTION CODE

B. Hoření, V. Horák and Z. Chára

The paper deals with the further development of the computational wing airfoil ice accretion prediction code ICE. Presented version enables computational rime ice and glaze ice accretion prediction on single and multi-element airfoils in acceptable time of solution. Mathematical model has been modified for variable wall temperature along the airfoil surface. The code was also improved for the better approximation of transition boundary layer location. There are shown results ice accretion prediction of the wing airfoil with a slotted flap and various cases of predicted ice shapes in dependence of air temperature.

Keywords: Aircraft icing, ice accretion simulation, icing code

Page: 44 - 50

LEVEL STRAIGHT ACCELERATED FLIGHTS

J. Salga

The paper introduces the analytical method derivation for flight time and flight path length in horizontal straight flight. An airplane is considered to be the mass point. Aerodynamic characteristics of the airplane are replaced by the parabolic polar curve. Engine thrust does not change with flight speed. Working formulas are determined on the base of the analytical integration of the airplane motion equation. All solutions are performed in general dimensionless shape. Determination of the real airplane characteristics requires knowledge of the optimum airspeed at operation conditions.

Keywords: Level straight flight, equation of motion, flight performance, optimum airspeed

Page: 51 - 63

CORROSION RESISTANCE OF PLASMA NITRIDED STRUCTURAL STEELS AND MODERN METHODS OF TESTING

D. Kusmič, V. Hrubý

The corrosion of metals is at first a technical and technological problem of duty and economical point of view. The corrosion degradation is in principle a weight-shortage of metals, which can cause a construction damage by one or several uncontrolled chemical reactions, which are proceeding spontaneously. Many methods of corrosion testing are used to check the corrosion resistance of machines components. Many of these methods are leading to the degradation or destruction of the checked specimens (the atmospheric corrosion testing, laboratory testing by the NSS, AASS, CASS method or solid drops method). The modern corrosion testing methods gives results of corrosion resistance by non-destructive methods testing, e.g. the electrochemical testing. Some of mentioned testing method were used, at first to evaluate the benefit o nitriding and nitrooxidizing to corrosion resistance of some structural steels and at second to judge the agreement of these methods.

Keywords: Corrosion, structural steels, plasma nitriding, nitrooxidizing, corrosion testing

Page: 65 - 75

THE USING OF KALMAN FILTERING FOR DOPPLER DIFFERENCE/TIME DIFFERENCE OF ARRIVAL (DD/TDOA) SYSTEMS

J. Veselý, P. Hubáček

This article is focused on the target localization and target velocity vector determination by the digital receiver. The target trajectory is filtered by Kalman filter whereas the target position and simultaneously the target velocity vector are input data of this filter. The verification of the mathematical solution of this type Kalman filter is performed by MATLAB simulation.

Keywords: Kalman filtering, Target localization, Digital receiver, DD/TDOA

Page: 77 - 86

MAGNETIC CORRECTION OF AIRCRAFT NAVIGATION INSTRUMENTS

J. Čižmár

The paper deals with new possibilities of magnetic correction of the aircraft navigation instruments (direction gyroscopes, inertial reference units etc.) which are given by application of new micro-magnetoresistive sensors.

Keywords: magnetoresistive sensor, accelerometer, gyroscope, compass, inertial reference unit, MEMS

Page: 87 - 91

KINEMATICS AND DYNAMICS OF RAMMING DEVICES

J. Balla

The paper deals with basic kinematic and dynamic characteristics of ramming devices with hydraulic drive.

Keywords: Ramming device, ramming force, hydraulic drive, motion equations

Page: 93 - 104