Abstract
To suppress the vibration of rotary parts, this paper established an unbalanced vibration response control model of rotary parts based on rotating axis coordinate system. This model considered the stacking transformation of geometric parameter errors and mass parameter errors of single stage rotor. First of all, the centroid transfer model based on the actual rotation axis was established, and the unbalanced excitation force vector of each stage of the rotor was studied. Secondly, the unbalanced excitation force vector of each stage of the rotor is substituted into the model of assembly vibration control based on the double constraints optimization strategy. Finally, the simulation analysis and the vibration experiment of three-stage rotor stacking assembly is carried out. The results show that the vibration of the engine rotor can be effectively suppressed by adjusting the assembly phase of the rotors, and the vibration amplitude of the combined rotor assembled by the double constraint optimization assembly strategy is 22.5% less than the vibration amplitude assembled by the direct assembly strategy. Besides, the coaxiality and the unbalance are reduced by 44.1% and 78.4%, which fully shows the advantages of the double constraint optimization assembly strategy.
Highlights
The unbalance exciting force caused by the centroid deviation from the actual rotation axis when assembling is an important reason of the rotary parts vibration
0, 360 trk 360 trk where qdoule is the vibration amplitude assembled by the third assembly strategy with the constraints of coaxiality and unbalance. c(θrk) represents the coaxiality of kth stage rotor, and cnlimit represents the maximum coaxiality allowed after assembly of kth stage rotor. u(θrk) represents the unbalance of kth stage rotor, and unlimit represents the maximum unbalance allowed after assembly of kth stage rotor, respectively
Taking the vibration response of the drive end as an example, the vibration amplitude is 17.55 μm when the second and third stage rotors are assembled by the direct assembly strategy. 1TrF7ohi0gteo◦urvraesinyb3sdr.taeVttmihibo:ern(aattah)iomTirnhdparlemsiett‐puadlgdiitmeeuedrisonest3coio.o8rnnaaμtrlsmosdleidawmgiahrbgaelrmynampothfhoevafissdbeerrciaavotnienogendnleadsmtiuaspng1ldie8teu8rrdo◦wetwoocrhrhkaaiincsnsghgeinsimspgbeawelsydistehopmfahrsabossleteaemdraybnblpygyalretthsies opphtaisme;iz(ba)tiPornojaecstsieomn dbilaygsrtarmatoefgvy.ibTrahteiornesaumlptslistuhdoewchthanagt itnhgewviitbhraastisoenmbalmy pplhiatused.e is reduced by 78.3% through the adjustment of assembly phase
Summary
The unbalance exciting force caused by the centroid deviation from the actual rotation axis when assembling is an important reason of the rotary parts vibration. Liu Jun et al [13] proposed a technique to reduce the problem of rotor misalignment by combining the two-objective optimization of rotor stacking coaxiality and unbalance and studied a method to predict the geometric deviation between the rotating axis and its own centroid axis based on the error measurement of single-stage parts. Dpio is the geometric center position vector matrix of ith stage rotor and can be expressed as: dpio =. The position vector of the measuring surface center of the kth stage rotor after assembly in the coordinate system XOYZ can be expressed as: dp0o-k =.
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