油液晃动及箱体耦联振动计算方法研究

 本文给出了油箱晃动响应的力学-数学模型。由于妥善处理了非线性项等问题,从而保证了计算收敛与稳定。并用有限元法和边界元法完成了晃动过程的模拟,分别给出了低频、共振、高频特性;箱体动特性和晃动的瞬时动响应位移及应力等数值强果,并配有图象显示等功能。从而给出了一种求解液体自由面大幅度晃动的几何及动力学边界条件的强非线性等技术问题的方法。

CALCULATION OF COUPLING VIBRATION FOR THE FUEL TANK AND OIL LIQUID SLOSHING

The response of fuel-tank-sioshing to aircraft maneuver is a difficult mathematical problem to he solved. Beginning with setting up the mechanical mode; and the respective mathematical model, this paper uses both F. E. and B. E. M. to imitate the sloshing process. The paper has developed some special techniques to deal with strong nonlinear characteristics, and provide satisfactory numerical results of displacements and stress for low frequency, resonance, high frequency and fuel tank dynamic response characteristics. The program not only assures convergence and stability of the solution but also has the function of graphic display. It is a valuable technique to deal with the strong nonltear oscillation of fuel tank with large amplitude and moving boundary condition on free surfaces