October 2013
Metalurgia International;2013, Vol. 18 Issue 10, preceding p5
Academic Journal
This work describes the dynamic behavior of a hydraulic excavator with the analysis of its effects on excavator operators. The excavator system has been described by applying LaGrange's equations of the second kind within the model space of six degrees of freedom, i.e. six generalized coordinates. The analysis refers to the excavator that is put into operation by a mechanism with pneumatic wheels and a mechanism with outriggers built in the undercarriage section. The obtained mathematical model represents the system of six nonlinear equations, non-homogeneous, differential equations of the second kind resolved by applying MATLAB packet program. Resolving the system of equations describing the dynamic behavior of a hydraulic excavator makes it possible to determine its natural frequencies and the corresponding vectors. The focus was put on observing the oscillations in human body together with the analysis of the effects of natural frequencies on the excavator operators. Because of the possibility to anticipate its dynamic behavior, the dynamic model proposed here may be a good model for designers when constructing hydraulic excavators with better performances.


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