The structure failure of the discharge boom of bucket wheel excavator C 700 S due to dynamic effects

Tokom operacije, kod rotornog bagera (BWE) se razvilo nepovoljno dinamičko ponašanje, plastična deformacija i lom konstrukcije. Posle sprovedene eksperimentalne/numeričke analize, potvrđeno je rezonantno dinamičko ponašanje strele odlagača. Dodavanjem novog elementa (štapa) je povećana dinamička krutost strele odlagača, pa je došlo do poništavanja rezonantnog ponašanja. Numerički model je urađen metodom konačnih elemenata i izveden je eksperiment, merenjem vibracija na unapred utvrđenom broju karakterističnih mesta. Eksperimentom, pored ostalog, su potvrđeni rezultati numeričke analize.During operation, the bucket wheel excavator (BWE) has developed bad dynamic behaviour, plastic deformation and structural failure. After performed experimental-numerical analysis, resonant dynamic behaviour of the discharge boom has been confirmed. Adding a new tension bar has increased the dynamic stiffness of the discharge boom, and so the resonant behaviour has also vanished. The numerical model is carried out by finite element method and the experiment is carried out by measuring the vibration on a predetermined number of characteristic locations. The experiment, among other things, has confirmed the results of the numerical analysis