Charts show variation In dynamic stability with rudder hinge-moment characteristics.Stabilizing rudder floating tendency combined with high degree of aerodynamic balance leadsto oscillations of increasing amplitude. Dynamic instability is increased by viscous fric-tion in rudder control system. Approximate method of calculating amplitudes of steady os-cillation is explained ...

underwater target imaging using acoustic waves is possible by employing the method used in synthetic aperture radars. in recent years, synthetic aperture sonar has been the subject of several researches. wherein imaging of underwater moving target is required, inverse synthetic aperture sonar (isas) idea can be used but specifications and limitations of underwater channel should be considered. ...

Due to the modernization of warships, it was necessary carry out strength calculations for newly assembled devices, which there were no detailed technical requirements. The authors try present and harmonize requirements naval military structures. lack experimental verification built systems indicated. Therefore finite element method used determine durability critical design elements. There is e...