| The rapid development of society and progress,rotating machinery has a wide range of applications in related equipment in the fields of aviation,aerospace,electric power,petroleum,and ships.It mainly depends on the rotation of internal components to complete specific functions.However,vibration has always been an important issue in rotating machinery.As the main core component of rotating machinery,the vibration caused by its unbalance is a common multi-fault of rotating machinery,which has a very important influence on the normal operation and life of the whole rotating machinery system.Therefore,the high-precision balance adjustment of the rotor to reduce vibration is an important guarantee for the long-term safe and stable operation of rotating machinery.In order to solve the problem of excessive vibration of the rotor due to unbalance,a high-speed rotor system based on the finite element model is proposed.Through the analysis of the established rotor model,the balance deviation of the rotor itself is obtained and compensated,so as to achieve the function of automatic centering and complete the dynamic balance adjustment of the rotor.Compared with the traditional rotor dynamic balancing method,this method does not need to add test weight and start and stop equipment for many times,and only needs to start up once to complete the dynamic balancing.In this paper,the dynamic balancing method without trial weight is studied.The main work is as follows:(1)The model unit models bearing spindle of the disk unit and the counterweight beam model using finite element method modeling.Combine these models to construct a three-dimensional finite element dynamics model of the rotor test bench,and carry out modal analysis.The structural modal analysis of the spindle system is carried out to reveal the dynamic characteristics of the spindle system in free mode.ANSYS workbench finite element model simulation test rig,which is calculated mode shape,the natural frequency and the unbalanced response analysis.(2)According to the test data of the rotor unbalance response test,the resulting response surface data correction method of Experimental Model amplitude correction is performed.Obtained a finite element model with the rotor imbalance response simulation value closer to the experimental value.Compare the simulation results of the finite element model with the response surface model and the MATLAB model,the results of the two have a higher similarity rate.Finally,the comparison with the measured values of the experimental platform found that the results are similar,indicating that the model is accurate and reliable.(3)After obtaining the finite element model consistent with the actual rotor test bench,a method of dynamic balancing without retry is proposed.According to a group of unbalance response signals of the rotor,the modal balance method and the finite element model are used to solve the balance weight of the rotor and complete the virtual dynamic balance.Finally,the method is verified by experiments,and the dynamic balance can be realized in one boot,which further proves that the method is practical and reliable.(4)After the dynamic balance of the rotor test bench is completed,the centrifuge test bench is further verified by the method of dynamic balance without test weight.Using the rotor dynamics analysis software written in MATLAB,the finite element model of the centrifuge test-bed is established,the structural modal analysis of the spindle system is carried out,the critical speed and modal shape of the rotor are calculated,and the dynamic response characteristics of the system caused by imbalance are analyzed.Then,according to a set of unbalanced response signals of the test bench,the method without trial weight is used to solve the balance weight that should be added,and perform virtual dynamic balance.Finally,the experimental results show that the dynamic balancing can be completed after one startup,and the balancing effect is good,which further proves that the method is practical and reliable.Through the research work of this paper,a method of rebalancing high-speed rotors without trial is obtained,in actual engineering dynamic balancing technology provides a new model.The experimental verification shows that the method is feasible and effective to ensure the stable operation of rotating equipment. |
