The Study On Numerical Computations Of The Minirice Combine Harvester Frame

The frame of rice harvester is the most important load-bearing part, and bears theforce and moment from transporting system, threshing system, cleaning system, grainstorage box and the driver. Using CAE technology to validate and optimize thestructural safety has become one of the most advantageous ways in modern designmethods. In this study, the welded box-section beam frame of a mini combine harvesterwas analyzed.First, the beam and plate computational models of the frame were established. Theframe was simplified with force method and displacement method respectively underfully loaded condition. And was simplified with lumped mass method. Second, theframe was analyzed with MSC.Patran/Nastran under four LBCs: fully loaded,harvesting, turn left and right; verified the static characteristics of strength and stiffness.Get the first10natural frequencies and mode shapes with Lanczos methods. Third, inorder to further improve the dynamic characteristics of the frame, optimized thethickness of the six reinforced plates with the objective function of the maximum of thesecond natural frequency, the constraints of the first natural frequency and maximumof the stress, the arguments of the thickness of the six reinforced plates;. Analyzed thestress concentration of the frame and improve the modeling around the corner of thebeams.Based on the analysis and optimization, the characteristics of static strength andstiffness were validated. While maintaining the safety factor, raising the second naturalfrequency to52.933Hz away from the resonance frequency, ensure the safety of staticand dynamic security of the frame. The stress concentration and improvements ofmodeling for the frame were studied...