Resonance properties of magnetic fluid sealants

G. V. Karpova¹ - O. V. Lobova¹ - V. M. Polunin¹ - E. B. Postnikov² - E. K. Zubarev¹

¹ Kursk State Technical University, 305040 Kursk, Russia
² Kursk State Pedagogical University, 305000 Kursk, Russia

Abstract
The results of experimental examination of an oscillation system with a big magnetic fluid plug hermetically sealing a gas-filled vessel, which is spring-loaded with a gas environment and elasticity of ponderomotive type, are discussed. An expression for resonance frequency of the oscillation system, which satisfactorily agrees with the experimental data, has been obtained considering elasticity of both types. The damping coefficient of the elastic vibrations excited within the frequency range of 20÷250 Hz is theoretically analyzed using two recognized models of reciprocating flow of viscous fluid through the Poiseuille and Helmholtz model tubes. It has been shown that the Helmholtz model can be accepted as initial in formulating an adequate theory of the dissipative system properties. The examination results can be useful while developing magnetic fluid seals and dampers. A numerical example for resonance frequency evaluation of magnetic fluid sealing employed in mechanical engineering is presented. Tables 2, Figs 4, Refs 7.