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一、引言 由于地震津波、外海潮波、风等因素的作用,天然港湾和人造港湾内的水体常常会发生数十秒到数十分钟的长周期显著振动。尽管这种长波特征的水面上下振动幅度不大,但水体的横向振动幅度却相当大。这不仅有碍于船舶的入港行驶,而且若系泊船舶的动态响应恰好有相近的共振周期,则会引起船舶与码头、船舶与船舶之间的剧烈碰撞,从而导致船舶系缆断掉,护舷材损坏,停泊或装卸时失事等十分严重的后果。 港湾水体的振动与声学、电学和光学中共振腔中的振动相类似。如果外来潮波、地震津
I. INTRODUCTION Water bodies in natural harbors and man-made harbors often experience significant long-term oscillations ranging from tens of seconds to tens of minutes due to seismic waves, tidal wave and wind. Although this kind of long-wave feature does not vibrate vertically up and down, the lateral vibration amplitude of water bodies is rather large. This not only hinders the entry of the ship into Hong Kong, but also if the dynamic response of the moored vessel happens to have a similar resonance period, it will cause violent collision between the ship and the wharf, the ship and the ship, resulting in breaking of the mooring line and protection of the ship Wounded, dead or deadly loading and unloading, etc. Very serious consequences. Vibrations in harbor waters are similar to vibrations in the resonant cavity in acoustics, electricity and optics. If foreign wave, earthquake Jin