A GAS-OPERATED BEARING DAMPER FOR TURBOMACHINERY - THEORETICAL PREDICTIONS VERSUS EXPERIMENTAL MEASUREMENTS .2. EXPERIMENTAL RESULTS AND COMPARISON WITH THEORY

This is the second of two papers describing results of a research proj ect directed at developing a gas-operated vibration damper for high-te mperature turbomachinery applications. This part presents the experime ntal measurements made on a gas damper hardware and compares them with the theoretical predictions given in Part I. It is found that the ise ntropic theoretical model predicts the damper characteristics quite we ll. A maximum damping of 2310 N-s/m (13.2 lb-s/in.) was measured at a natural frequency of 118 Hz using the present design and the results s uggest that significantly higher damping levels are possible with desi gn modifications.