Failure examination of disc header workpoints using CAE-system APM WinMachine
2018
Slobodyuk, A., Belgorod State Agricultural Univ. named after V. Gorin (Russian Federation) | Strebkov, S., Belgorod State Agricultural Univ. named after V. Gorin (Russian Federation) | Bondarev, A., Belgorod State Agricultural Univ. named after V. Gorin (Russian Federation)
The scientific work is devoted to search for failure reasons of disk workpoints applying CAE-system APM WinMachine. The purpose of the research is to find the causes of sudden destructions of the disk header`s spring tines and to search for constructive solutions for prevention of the detected failures. The problem is solved by constructing the finite element model of the structure’s problem element and analysing its strain-stress state under various loading conditions using the module Structure 3D CAE-system APM WinMachine and comparing these results with the analysis of full-scale samples. In order to determine the geometric parameters of the structure input elements, as well as to adequately model the fixation of the interested part and the correct load application a 3D model of the assembly unit can be used. As a result of our calculations it is found that the reason for sudden destruction of the disk header’s spring tines is the resonance with the torsional vibrations of the workpoint spring tine at the operating speeds of the unit. For finding engineering solutions to prevent the resonance of the elastic tine, a simplified plate- beam model of the elastic tine has been constructed, in which the loads of active force and structural mass influence are taken into account. In the number of experiments several solutions were made to change the eigenfrequencies of the obtained oscillatory system and a simple and effective solution for resonance preventing was proposed without significant design modification for farms using this disk header. For the manufacturer the improved design has been developed, which eliminates resonant phenomena and increases the workpoint reliability.
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