高温变形测量中热流场造成畸变的修正方法

On the Correction Method for Distortion Caused by Heat Flow in High Temperature Deformation Measurement

目前高温环境中材料的变形测量是研究的热点,基于数字图像特征识别的非接触测量方法促进了高温环境变形测量的发展,但由于高温环境的复杂性,存在很多测量影响因素,其中高温环境中热流场的存在对数字图像法的影响尤为明显。本文提出了一种对高温变形测量中热流场造成畸变影响的修正方法。针对基于光学成像方法的材料高温变形测量中常见的热流场扰动,通过数值仿真得到热流场模型及热流场分布状况,再结合光线追迹原理对热流场造成的图像畸变影响进行分析,用数值分析结果对高温变形测量实验结果进行修正。对比扰动修正结果与真实位移有很好的一致性,从而证明了所提方法的可行性和有效性。

A correction method for the distortion caused by heat flow in high temperature deformation measurement is proposed in this paper.Aiming at the common heat flow field disturbance in high temperature deformation measurement of materials based on optical imaging method,the heat flow field model and its distribution are obtained by numerical simulation.Combined with ray tracing principle,the image distortion caused by heat flow field is analyzed.Finally,experimental results of high temperature deformation measurement are corrected by numerical analysis.The feasibility and effectiveness of proposed method are proved by comparing the disturbance corrected result and the true displacement.