2.5维编织树脂基复合材料平板多尺度动力学模型修正

Multi-Scale Dynamic Model Updating of 2.5D Braided Resin-Based Composite Plate

在2.5维编织树脂基复合材料多尺度固有振动分析的基础上,开展基于实测结构模态数据的复合材料平板动力学模型修正研究,以获取精准反映其动力学特性的模型。首先,建立复合材料平板固有频率对弹性参数的灵敏度分析方法,分析了平板固有振动特性的主要影响因素;其次,建立基于灵敏度分析的复合材料多尺度动力学模型修正方法,形成了基于MSC.NASTRAN平台的模型修正程序。最后,利用实测结构模态测试数据,实现对复合材料平板动力学模型的修正。结果表明,对关键弹性参数进行修正后,不同边界条件和纱线走向的复合材料平板试验件固有频率实测数据与仿真数据的最大误差由10.44%下降至2.39%,相关性得到了大幅改善。此外,所提出的自由模态测试方案结合动力学模型修正方法,为复合材料等效弹性参数的试验辨识提供了新的技术途径。

Based on vibration analysis by means of multi-scale method,the dynamic model of 2.5 D braid-ed resin-based composite plates was updated using the modal test data,to obtain a model accurately reflecting itsdynamic characteristics. Firstly,sensitivity analysis method of the natural frequency with respect to the elastic pa-rameters was developed to modify the composite multi-scale dynamic model. It aims to identify the principal fac-tors affecting the natural vibration characteristics of composite plates. Secondly,a composite multi-scale dynamicmodel updating method in combination with sensitivity analysis was established. A model updating program basedon MSC.NASTRAN was devised. Finally,an updated dynamic model of the composite plates was obtained by ex-ploring the modal test data. After the key elastic parameters were updated,the maximum natural frequency errorbetween simulated and experimental data under different boundary conditions and yarn alignment directions of composite plates decreased from 10.44% to 2.39%,indicating a remarkable improvement in correlation. In addi-tion,the proposed dynamic model updating method combined with free modal testing provides a new technical ap-proach for experimental identification of equivalent elastic parameters of composites.