Abstract
For suppressing the sliding motion of the cask, the authors developed a sliding motion suppression system utilizing high viscous fluid and coaxial circular cylinders. Coaxial circular cylinders are installed at the bottom end of the cylinder and high viscous fluid is installed in the annular spaces. High viscous fluid in the annular spaces will cause very large added damping effects, thus sliding motion will be expected to be suppressed. In this study, added damping effects of the annular space fluid and sliding motion suppression effects are studied analytically and experimentally using a fundamental test model. It is found that increase in fluid viscosity brings us very large displacement suppression effects, however, at the same time, response acceleration increase which should be reduced in the view point of mitigation of rocking motion and structural integrity of the inner structure. Therefore, it is said that optimization in fluid viscosity will needed.
