海浪是海洋环境中最为复杂的自然现象，其时空概率分布具有较大的随机性。随着船舶制造吨位、尺度的加大，以及船型的复杂化，船体总振动频率不断降低，以致与波浪激励力频率逐步靠近，进而带来了较为严重的波激振动问题。目前，主要从线性和非线性的角度对波激振动进行研究，已有的线性理论往往难以解释低频激励诱发的船舶高频波激振动现象。从引起波激振动激励的源头出发，指出有限幅波理论中含有高阶分量，在独立于船型情况下能有效地解释船舶在波浪中产生高阶振动的激励力来源；推导了受航速、航向、波高、波频等因素影响下的波浪激励力表达式，同时指出了评估波浪参数的决定方法。利用虚拟质量法完成了双体船流固耦合波激振动响应计算，对比了该船在不同波频参与激励下，船体振动响应的差异。结果表明：有限幅波中高阶成分可对船舶产生高频激励，微幅波理论在研究船舶高频振动方面具有一定的局限性。
Abstract
Waves are the most complicated natural phenomena in marine environments because their space-time probability distributions are largely random.With the steady increase of ships’ tonnages and scales along with their complexity, their hulls’ total vibration frequencies are decreasing and gradually closing the frequency of wave excitation forces, thereby causing a more serious wave vibration problem.At present, wave vibration is mainly discussed from linear and non-linear perspectives.With existing linear theory, it is often difficult to explain the high frequency excitation ship-induced wave vibration phenomenon.From the source of the wave excitation, it was pointed out that the finite-amplitude wave theory contains high-order components, which could effectively explain how a ship produces high-order vibration excitation without considering the type of ship.The expression of the wave excitation force under the influence of speed, heading, wave height and wave frequency was deduced.At the same time, the method of determining the wave parameters was established.The response of the catamaran’s fluid-solid coupling wave excitation was completed by using the virtual mass method and comparison of the various ships’ vibration responses under various wave frequency participation.The results show that the high-order component of the finite-amplitude wave can produce high-frequency excitation to the ship.The theory of micro-waves has some limitations in the study of high-frequency vibrations of ships.
关键词
有限幅波 /
非线性 /
波激振动 /
高频 /
小水线面双体船
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Key words
limited amplitude wave /
non-linear /
wave vibration /
high frequency /
small waterplane surface catamaran
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