振动激励导致副船体部件裂纹增长的可靠性分析

Siri Kolle Kleivane, B. Leira, Sverre Steen
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引用次数: 0

摘要

船体振动是疲劳裂纹增长的一个重要因素,其主要振动来源是主机振动激励、波浪引起的弹簧和鞭打载荷以及螺旋桨的作用。在船体中部区域,波浪引起的载荷和主机是主要的振动源,而在船体尾部区域,螺旋桨的激励则占主导地位。目前还没有通用的方法来解决所有类型的振动问题,因此需要通过逐个案例的方法进行成本评估。船体振动和疲劳裂纹增长的复杂性和不确定性促使我们需要一种基于可靠性的方案来评估由此产生的疲劳裂纹扩展。本文概述了船体二级部件裂纹扩展失效概率的概率公式。本文分析了以发动机激励和波浪诱导载荷为振动源的通用货舱模型,并概述了振动响应的随机模型。极限状态是指可能出现的疲劳裂纹增长。所考虑的次要船体部件是管栈支架,它是将货舱内的货管固定在舱壁上的支撑部件。采用不同的初始裂纹尺寸来评估所应用的振动响应随机模型的适当性,并评估估计失效概率的准确性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reliability Analysis of Crack Growth Occurrence for a Secondary Hull Component due to Vibration Excitation
Ship hull vibration is a significant contributor to fatigue crack growth and the major sources of vibrations are found to be the main engine vibration excitation, the wave-induced springing and whipping loads, and the action of the propeller. In the midship region, wave-induced loads and the main engine are the major contributors, whereas propeller excitation dominates in the aft region of the ship hull. No general method exists to solve all kinds of vibration problems and they need to be evaluated through a cost-by-case approach. The complex and uncertain aspects of hull vibration and fatigue crack growth motivate the need for a reliability-based scheme for assessing the resulting fatigue crack propagation. In the present paper, a probabilistic formulation for the failure probability of the occurrence of crack propagation of a secondary hull component is outlined. A generic cargo hold model is analyzed with engine excitation and wave-induced loading as vibration sources, and a stochastic model for vibration response is outlined. The limit state is formulated as the possible occurrence of fatigue crack growth. The secondary hull component considered is a pipe stack support, which is a supporting component that attaches the cargo pipes to the wall inside a cargo tank. Different initial crack sizes are implemented to evaluate the adequacy of the applied stochastic model for vibration response and the accuracy of the estimated failure probability is assessed.
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