载人潜器砰击载荷数值预报方法研究

Numerical prediction method for slamming load of manned submersibles

本文针对载人潜器水面零航速漂浮状态下的入水砰击载荷计算方法进行研究,给出基于频域和时域运动响应结果进行砰击压力预报的计算流程,推导砰击压力极值计算公式,并对某载人潜器进行频域和时域砰击压力预报。根据计算结果发现:频域方法由于未考虑船体运动和波面倾角对入水角的影响,适用于计算船体摇荡对入水角影响不大的船型;对于载人潜器,艇体的大幅运动会使入水角减小,导致砰击压力系数的明显增大,此时应基于时域方法进行砰击载荷计算,以避免砰击载荷的低估;在零航速工况下,潜器在迎浪一侧的砰击压力会明显大于另一侧,因此艉部在随浪下的砰击压力较大,而艏部则在迎浪工况下砰击压力较大。

The calculation method for the slamming load of manned submersibles floating on the water sur⁃face at zero speed was studied in this paper,the calculation processes for predicting slamming pressure were provided based on the frequency domain and time domain response,the calculation formula for the extreme value of slamming pressure was derived,and the frequency domain and time domain slamming pressure pre⁃diction on a certain manned submersible were performed.According to the calculation results,the effects of ship motion and wave surface inclination on the water entry angle were not considered in the frequency do⁃main method,so it is only suitable for ships whose motion responses have little effect on the water entry an⁃gle.For a manned submersible,the motion response is significant,which will reduce the entry angle and lead to obvious increase of the slamming pressure coefficient.At this point,the slamming load should be calculat⁃ed based on the time domain method to avoid the underestimation of the slamming load.At zero speed,the slamming pressure of the submersible on the wave facing side is significantly greater than that on the other side.So the slamming pressure on the stern is greater in following waves,while the slamming pressure on the bow is greater in head waves.