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论述了理论建模与实验建模的特点,介绍了模型修正方法的相关理论,采用灵敏度分析方法,分析了光学镜架的设计参数:材料的弹性模量、密度、内径、镜框厚度、镜架底部厚度、筋板厚度的灵敏度系数,通过镜架有限元仿真与模态实验结果的对比,建立一个以固有频率为修正目标的多变量动力学修正问题,对包含非线性连接关系的镜架动力学模型进行了修正,修正结果表明前四阶固有频率的平均误差为2.5%,满足工程要求,同时模态阶次也得到了修正。
The characteristics of theoretical modeling and experimental modeling are expounded. Relevant theories of the model correction method are introduced. Sensitivity analysis method is adopted to analyze the design parameters of optical frames: elastic modulus, density, inner diameter, frame thickness, The thickness of the bottom, and the sensitivity coefficient of the thickness of the ribs, a multivariable dynamic correction problem with natural frequency as a modified target is established by comparing the finite element simulation with modal experiment results. The model was modified. The results showed that the average error of the first four natural frequencies was 2.5%, which satisfied the engineering requirements and the modal order was also corrected.