摘要
为解决冲击波压力测试中无法直接获得完整压力场以及通用压力拟合方法不适用于冲击波测试的问题,提出了一种基于非均匀有理B样条(NURBS)"蛛网"插值的场重建方法。将NURBS插值与"蛛网"型插值网络结合,运用在冲击波压力场重建中。理想场仿真重建,在爆心近距离处重建结果优异,无"平坦"效果,中距离无"花瓣"形误差,远距离误差几乎为零,误差平均值仅为4.14%,远远优于基于Delaunay三角化重建法。实测数据场重建,仅需部分原始数据,误差平均值小于4%,优于Delaunay三角化重建法和经验公式重建法。
To solve the problem that the whole pressure field of blast wave can not be obtained directly in the test and the general fitting method is not suitable for blast wave, a kind of field reconstruction method based was put forward on NURBS and interpolation net of “cobweb”. The interpolation net of ＂ cobweb＂ with the theory of NURBS interpolation was combined,and applies them to the reconstruction of the pressure field of blast wave. In the emulational reconstruction of ideal pressure field, excellent rebuilded results are obtained near the center of the explosion with no “flat” result. And no deviation like “petal” exists in the middle distance. Deviation in remote distance is almost zero, and the average of deviation is only 4. 14%, far smaller than that of the result of the reconstruction method based on Delaunay triangulation. In the reconstruction of measured data, the average of deviation is less than 4% with only part of the measured data,and the result is better than that of the reconstruction method based on Delaunay triangulation and reconstruction method using empirical formula.
出处
《科学技术与工程》
北大核心
2017年第18期258-264,共7页
Science Technology and Engineering
