| Due to the rotor material,manufacturing,assembly error and other factors,the unbalanced vibration of the whole machine is a problem commonly encountered in the operation process of the rotating machinery.For the unbalance problem of the dual rotor-stator system,the overall unit balance simulation test bench and the dynamic model of the rotor-support-stator were established.The simulation and experimental study of the overall unit balance were carried out.The overall unit balance experiment was carried out for a certain engine dynamics similar tester and a certain engine.Aiming at the problem of unbalanced vibration of multi-disc flexible rotor,a finite element technique was used to establish a multi-disc flexible rotor with no test weight and multi-speed multi-plane balance method.The main research contents are as follows:(1)With reference to the distribution characteristics of a certain type of engine support,a dual rotor-stator system tester was designed and built.The finite element model of rotor system,stator system and rotor-support-stator coupling system were established by using finite element software.The corresponding modes of the rotor system and the stator system were calculated.The influences of different casing material properties and foundation connection stiffness parameters on the dynamic characteristics of the whole system were simulated.(2)Based on the model of the dual-rotor-stator system,the attenuation rule of the rotor unbalance response from the bearing to the stator was studied.The sensitivity of the support measuring point and the casing measuring point to the unbalance response of the rotor system was analyzed,and the dynamic balancing rule based on the vibration response of different measuring points was simulated.The experimental research was carried out.(3)The critical speed and unbalance response of high and low pressure rotor systems in the positive and negative states of a certain engine simulation test bench were studied,and the dynamic balance experiment research was carried out.The sensitivity of different stator vibration measurement points to the unbalance response of high and low pressure rotors was analyzed.The overall unit balance experiment of the high-pressure rotor was carried out.(4)Based on the actual structure of a certain engine and the installation position of the sensor,the feasibility of two phase measurement methods of laser phase sensor and Hall sensor was explored.The fan rotor unbalance response sensitivity of different engine vibration points was studied.The influence coefficient method and the three-circle method was used respectively to carry out the low-speed balance experiment on the different stator points.(5)For the repeated start-stop problem of multi-disc flexible rotor multi-speed multi-plane balance,the finite element simulation technology was used to calculate the influence coefficient matrix of the rotor system with different correction planes at multiple speeds,which takes the multi-speed multi-plane into account.There was no trial weight virtual dynamic balance method,which replaces the traditional balance multiple start and stop test weight measurement process,and the simulation calculation results were verified by experiments. |
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