第6卷第2期2023年6月空天防御AIR&SPACEDEFENSEVol.6,No.2Jun.,2023基于虚拟激励法的多激励振动试验数值分析王肇喜,翟师慧,赵凡,王者蓝,谢夏阳(上海航天精密机械研究所,上海201600)摘要:针对细长型飞行器双台振动试验开展仿真计算与控制效果分析。根据模态叠加原理,建立细长型飞行器多输入多输出(multi-inputmulti-output,MIMO)随机振动试验中的动力学模型;采用虚拟激励法和逆虚拟激励法计算方法,分析细长型飞行器MIMO随机振动试验中不同控制测点数量、控制谱矩阵设置的可实现性及影响效果,并以其模拟件为研究对象,完成其两点、多点控制试验方式下不同控制谱矩阵设置的振动试验的数值模拟。经分析,虚拟激励法大幅提升了振动仿真计算精度,且双台振动系统在不同控制点组合下振动响应差异性加大。关键词:振动试验;虚拟激励法;多输入多输出(MIMO);数值模拟中图分类号:TJ761文献标志码:A文章编号:2096-4641(2023)02-0069-08NumericalSimulationoftheMulti-InputMulti-OutputRandomVibrationTestsBasedonPseudoExcitationMethodWANGZhaoxi,ZHAIShihui,ZHAOFan,WANGZhelan,XIEXiayang(ShanghaiSpaceflightPrecisionMachineryInstitute,Shanghai201600,China)Abstract:Inthispaper,thenumericalsimulationandcontroleffectofdouble-vibrationtestfortheslenderaerocraftwerestudied.UsingtheMode-superpositionmethod,adynamicmodeloftheslenderaerocraftundermulti-inputmulti-outputrandomvibrationtestswasproposedinthispaper.Thepseudoexcitationmethodandinversepseudoexcitationmethodwereadoptedtostudytheinfluenceofthereferencepointnumberandthereferencespectraldensitymatrix.ThenumericalsimulationoftheMulti-InputMulti-Outputrandomvibrationtestsofasimulatoroftheslenderaerocraftunderdifferentreferencepointnumbersandreferencespectraldensitymatriceswasacquired.Finally,thenumericalsimulationresultswerepromotedthroughthepseudoexcitationmethod,andthevibrationresponsesofthevariouscontrolpointcombinationsweredifferentforthedouble-vibrationsystem.Keywords:vibrationtest;pseudoexcitationmethod;MIMO(multi-inputmulti-output);numericalsimulation0引言振动环境试验是目前航天产品可靠性和环境适应性最主要的检验手段,用于发现产品设计上的缺陷、工艺上的不成熟及可...