Experimental modal analysis of block forming machine

Experimental modal analysis was used to determine the modal frequencies of the block forming machine and the modal shapes of the machine was calculated by DASP system. The test prototype finite element modeling(FEM) was established at the same time and the results of modal and vibration showed that: the maximum error between experimental modal and FEM was less than 3%,so the model accuracy was creditable. The analysis results indicated that the vibration table of vertical direction was affected by the 1st,5th,6th modal frequencies. The vibration taken place on the joint of actuator and rack at the 2nd and 3rd modes,it was one of the important factors influencing the quality of block and abrasion of component juncture. Finally,the estimation of block quality was given,the proposed improvement measures were the stiffness of moulding board and leaders were increased and the elasticity shape of oil system were decreased.