Experimental Study on High Speed Rotating Vibration Excitation of Blade Disk System with Underplatform Damper
Installing underplatform damper on high pressure turbine blades of gas turbines can effectively reduce the vibration stress of blades.Taking high-pressure turbine rotor of a marine gas turbine as the re-search object,the high-speed rotating vibration excitation test of blade disk system with underplatform damper can be carried out to master the blade vibration characteristics and guide the design of damping structure.The underplatform damper structure was designed,and a vibration excitation test system of at-omized oil droplets was developed;meanwhile,the working load of the blade at normal temperature was simulated,and the dynamic stress variation of the blade before and after the installation of the damper was analyzed through the test data.The experiment results show that the designed test system can perfect-ly simulate the bending and torsional resonance states of the blade;the modal parameters obtained in the case of undamped vibration excitation are equivalent to the theoretical values,and the accuracy of the theoretical calculation is verified by the test result;the bending vibration stress of the blade decreases ob-viously with underplatform damper,the best damping effect is made with optimal damping parameters;according to the amplitude-frequency response curve of the blade,it can be seen that underplatform damper enhances the nonlinear mechanical characteristics of the blade,and the vibration energy of the blade is transferred to each other.
万方数据
维普
