REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

DETERMINING NATURAL FREQUENCIES AND TYPES OF FREE
OSCILLATIONS OF THE PART OF EXCAVATOR BY
APPLYINGFINATE-ELEMENT METHOD

Olgica Lazarević

Military Academy, Belgrade, e-mail: olgica.lazarevic@va.mod.gov.rs

Vojislav Batinić

Military Academy, Belgrade, e-mail: vojislav.batinic@va.mod.gov.rs

Sonja Đurković

Utva Avio industrija, Belgrade, e-mail: sonja.djurkovic@yahoo.com

Abstract: This paper presents methdological approach to calculation of natural frequencies and modal shapes of the part hydraulic excavator by using of finite elements method. Modal anaysis realised by application of finite elements method, results by the rule, in a large number of modal shapes (frequencies) of natural oscillation. In real conditions only some of them are excited. The main purpose of this paper is calculation of natural frequencies that we can recognize desing effort and solutions for hindering of modal oscillation.

Key words: hydraulic excavator, vibrations, natural frequencies, vibration modes.