三维温度场声学测量重建及计算机仿真

Acoustic reconstruction of three-dimensional temperature gradient field based on computer simulation

相比单点温度测量而言,温度场的测量更加重要。温度场声学测量是目前最有发展前景的一种温度场测量方法,国内尚无人开展三维温度场声学测量的研究,为此,采用计算机模拟仿真的方法进行了三维温度场声学测量重建。以最小二乘方法为基础构建了三维温度场声学测量重建算法,以安装了32只声发射/接收传感器、并被均匀地分割成64个空间网格的正立方体型区域为测量空间,在考虑和不考虑"声线弯曲效应"的情况下,对球对称型模型温度场进行了仿真重建。仿真结果不仅与理论预测符合得较好,而且在考虑了"声线弯曲效应"后,温度场的反演精度有了很大提高,说明"声线弯曲效应"是影响温度场重建质量的重要因素之一。

The temperature field measurement is more important compared with the single point temperature measurement.Temperature field acoustic measurement is the most promising temperature field measurement method at present.The acoustic measurement of three-dimensional temperature field was performed by computer analog simulation,which constructed acoustic reconstruction algorithm of 3-D temperature field by least squares method,took cube′s area with 32 acoustic sensors as measuring space which was divided into 64 space grid equally.Considering or without considering the acoustic wave refraction,the temperature field to the spherical model temperature field was reconstructed.The simulating result is consistent well with the theoretical estimation.In addition,when the acoustic wave refraction was considered,temperature retrieval accuracy has been greatly improved.The fact means that acoustic wave refraction is one of the important factors to the temperature field reconstruction.