To get a valid dynamics model of nipper mechanism on comber,which determined its dynamic response,the shear deformation,tension-compression deformation,and bending deformation were considered in strain energy.Non-linear factors were retained,including the quartic term of displacement gradient,the cubic term of coupled displacement gradient,and shear deformation,and their effects on dynamic response were studied closely.Comparing to linear approaches in the low-speed range,it is found that the dynamic responses predicted by all approaches make no significant difference,however,in the high-speed range,the approach neglecting the quartic term overestimates the vibration amplitude more than 8-fold and the approach ignoring shear strain underestimates the vibration amplitude almost 3-fold.Therefore,non-linear finite element formulation taking into account the quartic term and shear strain is needed in analyzing high-speed nipper mechanism on comber.
