This work deals with effects of asymmetric stiffness on the dynamic behaviour of the rotor system. The analysis is presented through an extended Lagrangian Hamiltonian mechanics on the asymmetric rotor system, where symmetries are broken in terms of the rotor stiffness. The complete dynamics of asymmetries of rotor system is investigated with a case study. In this work, a mathematical model is ...

The helicopter vibrations generated by the main rotor/gearbox assembly are principal cause of damage to cockpit instruments and discomfort crew in terms cabin noise. path vibration transmission fuselage is through gearbox rigid support struts. With aim reducing these vibrations, this paper presents design a low-weight high-performance active damper for control developed Elettronica Aster S.p.A....

Abstract The article presents the results of modeling a ship’s synchronous generator. Based on preliminary design calculations, geometric model generator was built. static and overclocking processes are investigated. For modes, frequency response process is obtained. A numerical used to identify mechanical defect. On example simulated defect an electrical machine - eccentricity rotor, signature...

let $d=(v,a)$ be a finite simple directed graph. a function$f:vlongrightarrow {-1,0,1}$ is called a twin minus dominatingfunction (tmdf) if $f(n^-[v])ge 1$ and $f(n^+[v])ge 1$ for eachvertex $vin v$. the twin minus domination number of $d$ is$gamma_{-}^*(d)=min{w(f)mid f mbox{ is a tmdf of } d}$. inthis paper, we initiate the study of twin minus domination numbersin digraphs and present some lo...

In this article, turbulent flow heat transfer in the air gap between rotor and stator of a generator under nonhomogeneous heat flux is studied experimentally. The rotor consists of four symmetrical triangular grooves. The stator surface is smooth and does not include any grooves. The relative heat flux between the rotor and the stator is 1 to 3. Temperature and heat flux are measured locally at...

Crack fault of rotor is one of the most prominent problems faced by magnetic bearing rotor system. In order to improve the safety performance of this kind of machinery, it is necessary to research the vibration characteristics of magnetic bearing cracked rotor system. In this paper, the stiffness model of the crack shaft element was established by the strain energy release rate (SERR) theory. T...

In this paper, a new decentralized adaptive control with modified Minimal Controller Synthesis MCS is proposed to position the beam of the Twin Rotor Multi-input multi-output System (TRMS) at the desired positions quickly and accurately. A new hyperstability based adaptive control technique, called decentralized Error-based minimal controller synthesis with integral action (DEr-MCSI), is develo...