Research On Multiorder And Multiplane Balancing Of High Speed Rotor

Traditional research methods are often analyzed with certain rotating speed under the response data of steady state.The static balancing method is mostly with the help of certain imbalance identification equipment for equilibrium.This balancing method is not only time-consuming,but also inconvenient for field balancing.In such circumstances,establishing a kind of befitting means to obtaining transient unbalance response of actual rotor-bearing system is of great significance which should be efficient and accurate.In the current studies,this paper presents the dynamic balancing method using the acceleration amplitude information under the instantaneous unbalance extraction of rotor system.Surround this main content,various researches,such as the establishment of equilibrium theory,application in the model rotor-shaft system,and the stability and effectiveness validation on the power turbine rotor system have been conducted.Furthermore,the experiment design of high-speed rotor system makes a verification for the proposed balancing procedure.This work can be summarized as following aspects:1.A multiorder and multiplane balance method on run-up informationBoth unbalanced azimuth and modal measuring points(MRMP coefficient)are applied to the dynamic balancing procedure.Correction masses add on multiplane by recognition process from the unbalance information obtained during 4 times' run-up sets.This schedule makes it possible to carry out unbalance masses in accordance with the resonance region through numerical simulation.2.The precise integration algorithm for various speed rotorA modified precise integration method with Magnus expansion is established for time varying movement differential equation of motion,which suits for various speed flexible rotor system.Dynamic parameter identification,stability estimation,integral precision and computational efficiency have been taken into consideration to conduct independent research,respectively.The applicability of proposed method is determined by an comparison with Newmark-? method.With this basis,the described algorithm and detailed balancing process is feasible for transient unbalance recognition.3.Transient unbalance analysis of turbine power rotor systemBoth transfer matrix method(TMM)and finite element method(FEM)are used to set up the corresponding analysis model and simplify the complex vortex engine power turbine rotor system to the rotor-bearing system according to the industrial rotationalsimplified modeling theory and criterion.This process analyzes the difference of unbalance responses between TMM and FEM which is laid a foundation for unbalance identification of complex flexible rotor system.The two-dimensional harmonic axis-symmetric model is established by Samcef/Rotor which is a large rotating machinery analysis software.The first three modes and critical speeds are used to verify the accuracy of this model.The transient response transformation is summarized by calculating the transient unbalance response during the run-up procedure.4.Verification of dynamic balancing method for turbine rotor systemAs to the proposed dynamic balancing scheme,various combination of equilibrium planes are selected to observe the influence of different combination with multiple distribution imbalance.The information given by run-up experimental investigation can be treated as a preliminary validation of the proposed method.Three balancing planes are used to estimate the identification effect of effectiveness and accuracy.5.Stability and adaptability of balancing method by influence factorsThe dynamic balancing process is studied under the affection of influence factors such as unstable rotary speed,noise interference and nonlinear on stiffness and damping of bearing.Simulation results show that the proposed balancing procedure has enough adaptability.6.Experimental verification of unbalancing methodThe experimental scheme is designed for testing on high speed rotating device.Wavelet transformation,low-pass filtering and tracking filter are used to smooth the non-stationary signal which is obtained from run-up process of turbine rotor system.With this condition,preliminary validation in the validity and applicability of the proposed balancing method for complex rotor system is put forward.