基于动力吸振原理的新型组合吸振器设计及直升机应用OA

Multi-order vibration loads on helicopter rotor systems are the main source inducing airframe vibra-tions,and conventional 1-way vibration absorbers are difficult to balance the multi-direction vibration require-ments in flapping and lag directions.To reduce the 5/REV flapping loads and 6/REV lead lag loads on helicopter rotor systems at the same time,a combined vibration absorber for helicopter blades was proposed and de-signed.Firstly,the vibration reduction performance of the combined vibration absorber was verified through the rotation test of the ground test bench.Secondly,a theoretical analysis model for the combined vibration absorb-er was established.Finally,with the rotor system vibration response as the assessment index,the vibration re-duction performance analysis of the combined vibration absorber was carried out.The results show that,when the rotor system is equipped with a combined absorber,the vibration response under the 6/REV lead lag loads can be reduced by 76.1％and that under the 5/REV flapping loads can be reduced by 53％in the condition that the weight increase ratio of the rotor system is only 7.4％,and the comprehensive damping efficiency can reach 63.5％.