Real ship slamming pressure peak forecasting method

Abstract

The invention belongs to the technical field of ship slamming pressure forecasting, and particularly relates to a real ship slamming pressure peak forecasting method. The falling body slamming test system is mainly composed of a movable bracket, a gliding module and a hoisting module. The whole mechanism slides along the track of the towing tank at a certain horizontal speed by dragging the bracket through the traction device. The test piece is lifted and released through the lifting module, so that the test piece slides down in the vertical direction. Fnally, the slamming load test of simulating the horizontal speed and the vertical speed between ship waves at the same time is realized, and compared with a traditional falling body slamming load test device, the falling body slamming load test device can more truly reflect the actual situation of ship wave slamming. A dimensionless slamming coefficient Km of an equal-ratio reduction model of a to-be-tested real ship is calculated through a falling body slamming test, a predicted value Ps of a slamming pressure peak value of the real ship can be obtained by predicting the navigational speed Vs of the real ship, strength checking and optimization design are carried out, and a theoretical and test basis is provided for design and checking of the real ship.

Description

technical field [0001] The invention belongs to the technical field of ship slamming pressure prediction, and in particular relates to a method for predicting the peak value of real ship slamming pressure. Background technique [0002] When a ship sails in harsh sea conditions, the ship will inevitably have a severe impact with the waves. It is usually called the "slamming load" of the ship when the short-term action time and large amplitude transient load . Severe slamming loads can lead to damage to the local structure of the hull and even endanger the survival of the entire ship. Therefore, it is very necessary to accurately predict the slamming load of the ship in the ship design stage. For the strong nonlinear phenomenon of slamming, pure theoretical calculations cannot meet the design requirements in many aspects. Therefore, the development of a reasonable falling body slamming load test device is of great significance for the study of severe slamming phenomena betwee...

AI Technical Summary

Problems solved by technology

[0005] (1) The actual state of slamming on a real ship is that a ship with a speed is moving in the waves, and the existing test device cannot reflect the relative speed of the waves and the hull

[0006] (2) The test device is based on the water tank of the falling body test, and the scale is small, which leads to the small scale of the object that can use the existing falling body device. As far as the ship is concerned, the scale ratio is too small to distort the test measurement results

Images