飞机翼面气动载荷压力分布有限元节点插值方法研究

Study on the Interpolation Method to Calculate the Aircraft Wing Aerodynamic Press Distribution on FEM Nodes

以气动点上的压力值作为输入,通过插值方法得到结构有限元节点上的压力值,分别采用薄板样条插值函数和弯曲板单元形函数插值的方法进行有限元节点的压力值计算,并将两者的插值结果进行了比较。结果表明,两种方法计算得到的总载、总矩均与试验结果符合较好,误差均在3%以内。相比较而言,弯曲板单元插值方法计算得到的压力分布曲面更光滑,总载、总矩也更为准确。

In order to calculate the press on Finite Element Method （FEM） nodes according to the press on aerodynamic nodes, two methods which are thin plate spline function and bending plate element interpolate function were introduced in this paper. Then the results of the methods were compared and total load and total moment were consistent with the test result well, the error of both methods was less than 3%. The result of bending plate element interpolate function is more accurate and the press surface is more consecutive.