Design And Dynamical Characteristics Analysis Of The Test Rig For Heavy-duty Gas Turbine Rotor

Heavy-duty gas turbine power unit rod-fastened rotor is one of the key components of heavy-duty gas turbine, its structure is significantly different from the general steam turbine rotor. But its design basis and vibration mechanism of rod-fastened rotor remains unknown because of the blockade of foreign technology for many years. For the purpose of exploring in design basis and vibration characteristics of heavy-duty gas turbine rod-fastened rotor, many researches are carried out in this essay, such as designing test rig of heavy-duty gas turbine rod-fastened rotor, numerical simulation of rotor based on the finite element method, analyzing the dynamical characteristics of rotor, and doing the fault simulation.First, the types and characteristics of heavy-duty gas turbine rod-fastened rotor were analyzed and summarized, at the same time, the test rig of heavy-duty gas turbine rod-fastened rotor is designed by similarity theory of geometry and severity and taking GE 9FA gas turbine rod-fastened rotor as a prototype, and introduce components, the basic characteristics and the function of this test rig.Second, Modal analysis is done by ANSYS, a finite element software, for test rig shaft of heavy-duty gas turbine rod-fastened rotor, and the first three natural frequencies in bending vibration and torsional vibration and vibration modes of test rig shaft are given, and the dangerous sections of the test rig shaft at the first three torsional vibration frequencies are pointed out:dangerous sections of first and second order are on both sides of the middle coupling of the shaft; dangerous sections of the third order is near the part shaft of compressor left wheel. All results show that the test rig can pass the first bending critical speed, and the rod-fastened rotor of test rig is flexible rotor.Finally, the rotor unbalance response and rubbing fault response were simulated. The effects of the unbalanced mass the size and position of the dynamical characteristics of the rotor the impact size and position of the rotor dynamical characteristics, and the response of the same position to the different position and different positions to the same position are simulated respectively; The influence of bearing parameters on the dynamic inherent characteristics of shafting is studied for the following experimental research on the heavy-duty gas turbine rod-fastened rotor test rig.