Experimental Investigation of the Leaf Type Bearing Structure with Undersprings Under Dynamic Excitation

With foil bearings, rotors achieve high rotational speeds with less friction and wear. In addition, here the required space is small no peripheral components like liquid tanks or pumps are needed. The drawback a more complex prediction of real behavior in rotordynamic systems. Impedance test rigs suitable for investigating structural-dynamic bearing properties validating theoretical models. This article presents discusses measurement dynamic behavior, i.e., stiffness damping coefficients, structure leaf type undersprings. These measurements include variations static load due to relative displacement shaft as well an attempt explain noticed anisotropic bearing. also shows how much controlled excitation improves comparability across frequency band. For this purpose, rig presented that has been further developed comparison known literature approaches. results show, loss factors examined up 4 times bigger below lift-off compared operation at 60,000 rpm. Furthermore, movement amplitudes loads have great influence on damping.