Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 New Trends in Production Engineering

2 2019

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Vibration analysis of a bucket wheel excavator boom using rayleigh’s damping model

Popescu Florin Dumitru, Radu Sorin Mihai, Kotwica Krzysztof, Andraș Andrei, Kertesz (Brînaș) Ildiko, Dinescu Stela

New Trends in Production Engineering

2019

Vol. 2, Iss. 1

233--241

For the ERc 1400-30/7 type bucket wheel excavator (BWE) used in various Romanian open pit mines, a virtual model of the boom was constructed in SolidWorks. On this model, the variable in time forces acting during the excavation process were simulated, and the time history analysis (time response) was performed. This dynamic time response analysis was performed for excavation of homogenous material only, considering the damping as being of Rayleigh’s type, where the damping matrix is a linear combination of the mass and stiffness matrices. Based on the conducted analysis, the displacements of the boom during excavation were observed.

Simulation of the frequency response of the ERC 1400 Bucket Wheel Excavator boom, during the excavation process

Popescu Florin Dumitru, Radu Sorin Mihai, Andraș Andrei, Kertesz (Brînaș) Ildiko

New Trends in Production Engineering

2019

Vol. 2, Iss. 1

153--167

The paper deals with the modal analysis and frequency response analysis of a bucket wheel excavator (BWE) boom, obtained by simulation, based on a virtual model of an existing BWE boom. The boom, which generally is realized as a spatial truss, is the most vulnerable subsystem of the BWE, being submitted to severe operational loads characterized by very pronounced cyclical, dynamic and stochastic variability. This vulnerability is the consequence of its shape and constructive parameters and the nature, source and character of the external exciting loads to which it is exposed. The classical approach recommended by standards and norms cannot predict the occurrence of failures caused by vibration, which produces fatigue due to the load’s cyclical variability and the deformation produced by resonant vibration of some constitutive elements. As exciting load we considered the operational forces acting on the bucket wheel. In this manner we can take into account the constructive features - with modal analysis, and the vibration regime - with frequency response analysis. The proposed method is useful both in the design phase of new load-bearing structures of truss type subjected to high-variability forces, and also in refurbishment or improvement phases of the existing structures of this kind.