Research On Principle And Method Of Virtual Dynamic Balance Of Coaxial Counter Rotating Double Rotors

The coaxial contra rotating propeller rotor has complex structure,many blades,often accompanied by gear drive,which is easy to produce mass imbalance and cause vibration between rotors.The rotors are connected by intermediate bearings and gears,resulting in mutual coupling of vibration and unable to determine the vibration source.However,the domestic field mostly uses offline dynamic balancing method for balancing,which needs to start and stop the equipment for many times,resulting in economic losses The economic benefit is declining.There are also some special rotor systems that can not be installed with Key phase sensors,so that the phase information is missing in the dynamic balancing process,which brings some difficulties to the maintenance.Therefore,this project takes the research on the dynamic performance of coaxial contra rotating rotor as the object,carries out the simulation analysis of coaxial contra rotating double propeller rotor and the research on no key phase virtual dynamic balancing algorithm(1)The basic principle of the finite element method of virtual dynamic balance is described.The derivation of the commonly used virtual dynamic balance method,namely the influence coefficient method,is introduced.The commonly used software of virtual dynamic balance is obtained.The principle of single input and double output of an aero-engine coaxial counter rotating propeller is analyzed.(2)The virtual dynamic balancing method of single rotor without key phase is studied,and the dynamic balancing method based on particle swarm optimization or neural network is described.The two algorithms are simulated and verified respectively,and good vibration reduction effect is achieved.Finally,the two algorithms are summarized and compared.(3)The simulation model of the coaxial counter rotating rotor of a certain type of aero-engine is established,and each rotating part is simplified according to certain criteria.The modal analysis,unbalanced response analysis and the influence of bearing and gear stiffness change on the rotor system are carried out.(4)The virtual dynamic balance algorithm based on particle swarm optimization is verified on the test-bed rotor,and the unbalance can be balanced in one trial weight without speed signal,and the vibration reduction effect can reach 95%.(5)The coaxial counter rotating test-bed is built,and its finite element model is established.The dynamic performance and the law of coaxial contra rotation are obtained by simulation analysis.Finally,the experimental verification is carried out.