Abstract

To improve the quality of concrete block, a composite magnetorheological damper that is composed of rubber spring and magnetorheological damper for block forming machine is designed combined with the actual demand of block forming machine. The vibration compaction condition of the block is simulated by the test-bed, and the performance parameters. Finally, the designed shock absorber is applied to the block forming machine. The performance of the composite magnetorheological damper was studied by collecting vibration signals. Results show that the vibration reduction effect of the block forming machine is best when the flow Q=99L/min, pressure P=14Mpa of the hydraulic exciter and the control current I=0.5A have large magnetorheological damping. The composite magnetorheological damper has remarkable damping effects on the block-forming machine and improves the forming quality of the block. Autoregressive bispectrum is a suitable and effective method to study magnetorheological dampers.