| The flapping, lagging, and torsional motion of the bearingless rotor is realized by the bending or torsional deformation of the flexible composite beam. In this paper, based on the dynamic characteristics of the bearingless rotor, combined with the theory of composite beams, the optimization design of the flexible beam with bearingless rotor is studied.The main contents of this paper are as follows:(1) Combining rotor dynamics theory and beam finite element, using Mathematics to establish steady state response model of elastic blade. Select a set of rotor design parameters, calculating its inherent characteristics to verify the validity of the selected parameters.(2) Deriving the calculating formula of the dynamics characteristics of the composite beam. Using Matlab to analysis and calculate the model beam, and compare the results with the calculating results of ANSYS analysis, verify the rationality of the formula. Change the hub radius, rotating speed, ply angle to study their effect on the natural frequency of the laminated beam.(3) Studying in mechanical properties of the composite structure and the laying process, combine with using of ACP ANSYS module to process the composite structure. An entire single blade example model is established to analyze the influence of the parameters of the flexible beam on the dynamic characteristics of the rotor.(4) Parameterizing flexible beam, with flexible beam parameter, composite fabric orientation, and layer number as the design variables, rotor dynamics requirements, parameter requirements as the constraint conditions, minimizing weight as objective function, established the structural dynamic optimization model.(5) Establishing the optimization calculation model, select the Screening and NLPQL optimization algorithm to optimize the calculation, get the sensitivity analysis results and the optimization results. The results are analyzed to verify the effectivity of the optimization model. |
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