SWATH船的纵向运动仿真及稳定性分析

论文字数:17610,页数:50

SWATH船的纵向运动仿真及稳定性分析

摘  要：SWATH船是一种具有优良耐波性的新型高性能船舶。SWATH船纵向运动的稳定性，是SWATH船稳定性的主要决定因素，本文根据劳斯-赫尔维茨判据分析了SWATH船纵向运动的稳定性，给出了适合工程应用的纵向运动稳定性简化判据和临界巡航速度的计算方法。
 SWATH船纵向运动仿真主要是在规则浪中和不规则浪中对SWATH船的纵向运动性能进行仿真，通过仿真结果分析船的纵向运动性能，以及加稳定鳍和不加稳定鳍对SWATH船纵向运动性能的影响。
 由于其水线面积较小，船的纵倾恢复力矩相应减少，随着速度的增加，作用在水下潜体上的Munk力矩迅速增大，是导致SWATH船纵向和横向运动不稳定的重要原因。为保证稳定性，可以通过增加稳定鳍来解决这一问题，同时，也可以进一步改善SWATH船的耐波性能。
 另外，稳定鳍的安装位置、展弦比、面积等参数都影响SWATH船纵向运动的稳定性。其中，首鳍的作用一方面促进失稳，但另一方却可以提高振荡响应的收敛速度 ，通常都与尾鳍组合使用，其面积比尾鳍明显小；尾鳍面积增大和位置后移均有利于提高稳定性，但它们都受到船舶结构的限制。
关键词：小水线面双体船；Munk力矩；纵向运动；稳定性判据

Longituidnal motion simulation and stability analysis of SWATH
Abstract: SWATH is a kind of new high performance ship with the excel seaworthiness.The stability of the longitudinal motion of SWATH is the important part of SWATH stability. This paper analyzes stability of longitudinal motion of SWATH according to Routh – Hurwitz stability criterion. A simplified method to determine stability of longitudinal motion and to calculate the critical speed for engineering purpose is introduced.
 The simulation of longitudinal motion of SWATH is mainly about the simulation of the longitudinal motion performance of SWATH in regular and irregular wave. According to the simulation results, the longitudinal motion performance of SWATH and the distinction between the situation with stabilizing fins and that without stabilizing fins were analysed
 The restoring moment of the longitudinal motion of SWATH is small because of the small waterline area. With the speed increasing, MUNK moment acted on the lower hulls increases quickly. The MUNK moment is the main factor that results in the unstability of SWATH. In order to ensure the stability of SWATH, the stabilizing fins can be adopted. And this all can improve the seaworthiness of SWATH.
 In addition, the parameters such as position, aspect ratio, area etc. affect stability of longitudinal motion. For example, the forward fin can promote unstability, but it can accelerate the convergence of the longitudinal motion oscillation SWATH. And it is usually used in combination with the tail fin. The area of forward fin is also smaller than the tail fin. Increasing the tail area can also improve the stability of SWATH, but it cann’t exceed the structure limit of SWATH.
 Keywords: small waterplane area twin-hulls;  Munk moment ; longitudinal motion ; Stability criteria

目    录
 
1  绪论 1
1.1  课题的来源、意义和研究现状 1
1.2  SWATH船的结构及特点 2
1.3  SWATH船的发展趋势 4
1.4  课题的基本内容 5
2  SWATH船纵向运动的模型及稳定性分析 6
2.1  波浪中SWATH船的纵向运动数学模型 6
2.2  静水中SWATH船的纵向运动数学模型 7
2.3  SWATH船纵向运动的稳定性判据 8
2.4  SWATH船纵向运动的三个特征参数 10
2.5  航速对SWATH船纵向运动稳定性的影响 10
2.6  本章小结 15
3  MATLAB仿真 16
3.1  海浪仿真 16
3.2  长峰波随机海浪中垂荡力（ZZ）和纵摇力矩（MM）的仿真 17
3.3  SWATH船的纵向运动仿真 29
3.4  利用特征根分布图分析SWATH船的稳定性 34
3.5  本章小结 39
结  论 40
致  谢 41
参 考 文 献 42
附   录 43