基于激振试验的直升机机体当量参数计算分析  

Analysis of Equivalent Parameter Calculation of Helicopter Fuselage Based on Excitation Test

作　　者：吴靖 刘湘一 宋山松 WU Jing;LIU Xiangyi;SONG Shansong(School of Basic Science for Aviation,Naval Aviation University,Yantai 264001,China)

机构地区：[1]海军航空大学航空基础学院,烟台264001

出　　处：《南京航空航天大学学报(自然科学版)》2025年第2期259-265,共7页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：在基于激振试验频响数据计算直升机当量至桨毂中心的参数的过程中,取点不同以及幅值误差和相位误差都会造成计算的当量参数不同。针对此问题,采用不同取点方案对某型机大质量状态机体的横向一阶模态当量参数进行计算。计算所得的当量质量和当量刚度相差很大,分析表明,该结果主要是由相位偏差引起。文中推导了当量参数关于幅值误差和相位误差的计算公式,并对其进行分析,给出了关于取点的建议:可根据激出位移响应幅值大小进行选取,选取的两点尽量接近共振点,采用所得当量参数计算频响曲线,并与试验数据对比进行验证;为避免当量参数的计算对幅值误差和相位误差过于敏感,选取的两点的激振频率差值不要过小。When calculating the equivalent parameter to the hub center of helicopter fuselage based on excitation test data,the calculation result would be different with different point-taking schemes,amplitude errors and phase errors.In terms of this issue,the equivalent parameters of the 1st⁃order mode of transverse motion of a certain type of helicopter with large mass are calculated with different point-taking schemes.The difference between the calculated equivalent mass and equivalent stiffness is significant,and analysis shows that this result is mainly caused by the phase deviation.The computational formulas of equivalent parameters for amplitude error and phase error are derived.After analyzing the formulas,the suggestions of point selection are given as follows:The two points could be selected based on the amplitude of the excited displacement response,and they should be as close to the resonance point as possible.The frequency response curve is calculated using the obtained equivalent parameters and compared with the test data for verification.To avoid the sensitivity to amplitude and phase errors in the calculation of equivalent parameters,the difference in excitation frequencies between the selected two points should not be too small.

关 键 词：激振试验 直升机机体 当量参数 

分 类 号：V212.4[航空宇航科学与技术—航空宇航推进理论与工程]