A Study on Damping Capacity of a Jointed Cantilever Beam : 2nd Report, Comparison between Theoretical and Experimental Values

Abstract

The large-sized machine tools are often made of welded steel and to increase their damping capacity a jointed beam or a damping joint is often used. The behaviour of the damping capacity relating to the first, second and third modes of vibration of the jointed beam had experimentally been studied in the previous report, however, the method for the theoretical calculation of damping capacity of it has not been established yet. In this paper, the relationships between the slip ratio and the damping capacity have been theoretically investigated considering the first and second modes of vibration of the jointed cantilever beams used in the previous study. Through comparison between the experimental values obtained from the previous study and the theoretical values, it has been confirmed that the damping capacity of a jointed cantilever beam can be well estimated by using a method proposed here.