Experimental study on characteristic of sloshing impact load in elastic tank with low and partial filling under rolling coupled pitching

A series of experiments covering lowest three natural frequencies of rolling coupled pitching were conducted to investigate liquid sloshing with low liquid depth. The test results show that the most violent liquid sloshing in rolling and pitching is located in the vicinity of the first order natural frequency (f(1)). When the excitation frequency of rolling and pitching is located between 0.98f(1) and 1.113f(1), roof-bursting phenomenon of liquid appeared, and the maximum impact pressure is at 1.09f(1). When the external excitation frequency is at 1.113f(1), the number of sloshing shocks decreases sharply. Furthermore, the space distribution of the impact pressure on the left bulkhead and the top bulkhead was analyzed. It is concluded that with low liquid filling, the impact load is greater near the free surface and the top of tank, and the impact position of the side bulkhead increases with the increasing of the frequency near the resonant frequency. (C) 2019 Society of Naval Architects of Korea. Production and hosting by Elsevier B.V.