三体船横摇模型试验及其特性分析

三体船在波浪中的横摇特性和优点是三体新船型研发的技术支撑,采用模型试验和理论分析相结合的方法,对三体船横摇运动特性进行探讨。开展三体船静水横摇、正横浪零速波浪横摇模型试验,得出三体船线性、非线性阻尼假设下的横摇阻尼、频率响应和周期。通过横摇响应曲线的分析和对比,得出三体船不同侧体位置下波浪中横摇附加惯量、阻尼和运动响应、周期特性,以及侧体位置对以上各横摇特性影响的规律。研究表明：三体船横摇阻尼远大于常规单体船,而横摇运动幅值响应远小于常规单体船;侧体的横位置对三体船横摇具有显著影响,侧体纵向位置对横摇影响很小。综合考虑运动响应和横摇周期,在不规则波中三体船的横摇比常规单体船缓和得多。

Model Rolling Experiments of Trimaran and Characteristics Analysis

The unique roll characteristics of trimaran in waves and its potential benefit to the performance are the technical basis for the on-going RD in these areas.However investigation of the roll motion characteristics of trimaran was carried out by theoretical analysis incorporating model tests（i.e.zero speed roll tests in the calm water and beam waves,the roll damping,frequency response） and response cycle were obtained under the assumptions of linear,nonlinear damping conditions.Furthermore,the tri-maran roll damping,frequency response and the cycle characteristics of various outrigger positions and their impacts on such roll characteristics were validated.Present research shows that the roll damping is much larger than the conventional mono hull,while the roll motion amplitude response is much less,and the outrigger transverse position of the trimaran has dramatic effect on the roll motion,but the out-rigger longitudinal position has less effect.The study also indicates that the roll motion characteristics of tramarn in irregular waves are significantly mitigated than that of the conventional mono hull by taking into consideration of motion response and roll cycle.