线角复合随机振动试验参考谱定义方法

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中图分类号：TH113.1 文献标志码：B 文章编号：1671-5276（2025）05-0062-05

Abstract：To achieve synthetical linear-angular random vibrationtesting，the vibration reference spectral density definitiomethodforstructural translationalandrotationaldegresoffredomwasstudied.Basedonthecoordinate transformation relationship betwee theaccelerationresponseofcontrolpoints andthetranslationaland rotationaldegrees of freedom of the structure，formulas for calculating the root mean square magnitude of random linear vibration and angular vibration werederived.The structure was considered as a rigid body，andits movement kept consistent with the motion modeofthe control point，Thus theshape of thereferencespectral densityof thelinear一angular composite randomvibration testfitedtheoneof thecontrol pointtestspectral density.Theroot mean squarevaluesof thelinear vibrationand angular vibration were calculated from the given proportion of the structural linearvibrationand angular vibration magnitude and thecontrol point test spectral density.Atwo degreeof freedomsynthetical linear一angular random vibration control experimental system was constructed to achieve the beam model synthetical linear一angular randomvibrationexperimentalcontrol，verifying thefeasibilityof theproposedreference spectraldensitydefinition method.

Keywords：vibration environment test;multiple-input multiple-output;random vibration;synthetical linear-angular control;reference conditions

0 引言

振动环境试验是对产品结构在实验室内进行功能性和耐久性考核的有效手段之—[1-3]。（剩余5457字）