Wave encountering period-based wave richness depth calculation method

Abstract

The invention discloses a wave encountering period-based wave richness depth calculation method. The method comprises the following steps of 1, determining the ship scale parameters; 2, determining aninherent period of a ship; 3, determining the wave design elements; 4, determining a ship wave included angle psi; 5, calculating a wave encountering period Te; 6, determining a keel sinkage amount response amplitude operator; 7, calculating the keel maximum sinkage amount ZK; 8, calculating a maximum rolling angle theta m; 9, calculating the maximum sinkage amount ZBK of the bilge keel; 10, taking the larger one as the wave richness depth (Z2) psi j;11, when the ship wave included angles are not unique, calculating the wave richness depths (Z2) psi j corresponding to all the ship wave included angles, and taking the largest one as the final wave richness depth Z2. The method can more accurately reflect the influence on the wave rich depth when the ship generates the harmonic oscillationmotion, has the safer design value, adopts a single-variable multi-parameter empirical formula, and is relatively simpler and more convenient in operations.

Description

technical field [0001] The invention relates to the field of water conservancy science and technology, in particular to a calculation method for wave affluence depth based on wave encounter cycle. Background technique [0002] The wave margin depth refers to the margin depth that needs to be reserved for the channel due to the vertical motion response of the ship under the action of waves, and is mainly affected by the vertical motion components of the freedom motion such as heave, pitch, and roll. The wave encounter period refers to the time interval between two adjacent same phase points encountered by a sailing ship. When the wave encounter period of the ship is similar to the natural period of the ship (heave, pitch, roll, etc.), the ship will produce harmonic motion, resulting in a large vertical motion response. [0003] Since the wave encounter period is affected by the three factors of wave period, ship speed, and ship-wave angle, the calculation is more complicated...

AI Technical Summary

Problems solved by technology

The wave cycle is easy to use, but it is difficult to reflect the difference in the depth of the wave under the same wave cycle, different ship speeds and ship wave angles

This difference is less obvious in the case of short-period waves (wave period ≤ 10s), mainly because the natural period of ships of 100,000 tons and above is usually more than 15s, even in the case of waves (the included angle of ships and waves is 180°) The encounter period is the largest, usually less than 15s, and harmonic resonance will not occur. However, under medium and long-period wave conditions (10s to 30s), harmonic resonance may occur regardless of head-on or follow-up waves. The influence of the included angle of the ship waves cannot be ignored

There is no mature calculation method at home and abroad

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