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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >DETERMINATION OF WHOLE FIELD STRAIN IN COMPOSITE REFLECTOR USING PHOTOGRAMMETRY
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DETERMINATION OF WHOLE FIELD STRAIN IN COMPOSITE REFLECTOR USING PHOTOGRAMMETRY

机译：光度法测定复合反射镜的全场应变

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摘要

Conventional strain measurement techniques cannot be used to obtain the strains in composite reflectors under thermal environment. Though photogrammetry can be used to measure the deformations it cannot provide information on strains. In this work a methodology is developed to determine the strains from the displacements obtained from photogrammetry coordinate measurement. The strains are determined by applying equilibrium conditions and not from the gradient of the displacements. The results are verified using simulated data as well as experiment. It is demonstrated for a composite reflector of a typical spacecraft when subjected to thermal load. The methodology developed in this work helps in obtaining the strain distribution without using expensive digital image correlation equipment. This methodology can be used on wide variety of applications like inflatable structures, flexible structures etc., where strain gauge measurements are not possible to be carried out.
机译：传统的应变测量技术不能用于在热环境下获得复合反射器中的应变。尽管摄影测量法可用于测量变形，但它不能提供有关应变的信息。在这项工作中，开发了一种从摄影测量坐标测量获得的位移中确定应变的方法。应变是通过应用平衡条件确定的，而不是通过位移的梯度确定的。使用模拟数据和实验对结果进行验证。它被证明适用于典型航天器的复合反射器在承受热负荷时的情况。在这项工作中开发的方法有助于获得应变分布，而无需使用昂贵的数字图像关联设备。这种方法可用于无法进行应变仪测量的各种应用，例如充气结构，柔性结构等。

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