摘要
通过模型实验,对接近海底的水平管在波浪作用下的受力进行了分析研究。在诸数据分析方法中采用一种更稳定的最小二乘加权平均值法。文中计算了距海底不同高度水平管的力系数C_D、C_M和C_L值,发现随水平管逐渐接近海底,各力系数急剧增大,当相对缝隙度ξ(e/D)=0.1时,达最大值,并发现在本实验范围内,升力频率为入射波频率的2倍。结果中还给出了力系数随参数K_c数和ξ值的变化曲线。
A study of the wave forces on a horizontal cylinder near the ocean bottom with model tests is described in this paper. A comparison of four different methods shows that the uncommonly used method——least square mass ( LSM ) is themost stable one.The in-line and transvers forces on the cylinder, which is placed at various distances from the bottom of the wave channel, are measured. The force transfer coefficients are much larger when the cylinder is near the bottom than when it is in a free stream, but they don'ot increase unlimitedly and are maximum for ξ = 0.1. An interesting result is that: the ratio of lift frequency (fl) to wave frequency ( fw ) is 2.0. In the result, the curves of coefficients are given.
出处
《海洋工程》
CSCD
北大核心
1990年第3期24-31,共8页
The Ocean Engineering
