A Parameterized Model of Bolted Joints in Machine Tools

Hongqi Liu, Bin Li, Kuanmin Mao, Xiaolei Huang, Fangyu Peng
2014 International Journal of Acoustics and Vibration  
A new dynamic model for bolted joints in heavy machine structures is proposed. The influence of the bolt pretightening force, the interface dimensions and the surface roughness on joint dynamics (i.e. the stiffness matrix of finite element) were analysed. Each stiffness coefficient in the matrix can be expressed by an exponential function of preload, and a quadratic polynomial function of geometric dimensions. Sixteen specimens were thoroughly designed and analysed. Then, the resulting
more » ... resulting stiffness matrices were saved as templates, based on which could establish dynamic models of joints with different influence factor values, using curve-fitting and Response Surface Methodology (RSM). The methodology was validated by experiments with a specimen of the new design and a heavy-duty cutting machine.
doi:10.20855/ijav.2014.19.1339 fatcat:carna2yj6bdnnedfmv2h7brxae