90米自卸砂船结构设计与有限元计算外文翻译资料

 2022-09-20 10:28:59

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1.geometrically parametric study of central brace scfs in offshore three-planar tubular kt-joints

Multiplanar tubular KK-joints are one of the most popular joint types in offshore structures, which are exposed to cyclic loads and fatigue damages. In this paper, a fatigue prediction method based on scaled model test is proposed. First, a scaled KK-joint, including deviations for model simplification, was designed based on sensitive analysis and similarity analysis. Then, static and fatigue tests on the scaled model under axial loading were performed, by which hot spot stress (HSS) distributions and the maximum HSS were recorded. From the test, the fatigue crack initiates from the location of the maximum HSS and propagates along the weld toe. Finally, the maximum HSS of original KK-joint was deduced by finite element analysis (FEA), and then, the fatigue life was predicted accordingly and compared with the rule-based result.

Source: Journal of Offshore Mechanics and Arctic Engineering,v 138, n 2,April 01, 2016;

ISSN:08927219,E-ISSN:1528896X;DOI:10.1115/1.4032158;Article

number: 021602; Publisher: American Society of Mechanical Engineers (ASME)

2.Frequency Versus Time Domain Fatigue Analysis of a Semi-Submersible Wind Turbine Tower

The current paper deals with a study of a semisubmersible wind turbine (WT), where short-term tower base bending moments and tower fatigue damage were estimated by a frequency domain (FD) method. Both a rigid structure assumption and a generalized degree-of-freedom (DOF) model for including the first flexible mode of the turbine tower were investigated. First, response to wind and wave loads was considered separately, then superposition was used to find the response to combined wind and wave loading. The bending moments and fatigue damage obtained by these methods were compared to results from a fully coupled, nonlinear time domain (TD) analysis. In this study a three column, catenary moored semisubmersible with the NREL 5 MW turbine mounted on one of the columns was modeled. The model was inspired by the WindFloat concept. The TD simulation tool used was Simo-Riflex-AeroDyn from Marintek and CeSOS. The FD method gave a good representation of the tower base bending moment histories for wave-only analyses, for the moderate sea states considered in these analyses. With the assumption that the structure is completely rigid, bending moments were underestimated, but including excitation of the elastic tower and blades, improved the results. The wind-induced low-frequency bending moments were not captured very well, which presumably comes from a combination of nonlinear effects being lost in the linearization of the thrust force and that the aerodynamic damping model was derived for a fixed turbine. Nevertheless, standard deviations of the bending moments were still reasonable. The FD model captured the combined wind and wave analyses quite well when a generalized coordinates model for wind excitation of the first bending mode of the turbine was included. The FD fatigue damage predictions were underestimated by 0–60%, corresponding to discrepancies in standard deviations of stress in the order of 0–20%.

Kvittem M I, Moan T. Frequency Versus Time Domain Fatigue Analysis of a Semisubmersible Wind Turbine Tower[J]. Journal of Offshore Mechanics and Arctic Engineering, 2015, 137(1): 011901.

3. Application of a robust vibration-based non-destructive method for detection of fatigue cracks in structures

This paper presents a robust methodology for fatigue assessment of aluminum ship details using a hot-spot stress range approach. A series of fatigue tests of a typical aluminum ship detail was carried out to obtain a design S–N curve. The test detail was analyzed by the finite element method using several modeling techniques and element types. The results from both experimental tests and finite element analysis are discussed. Recommendations on the procedure of fatigue assessment of aluminum ships including S–N curve to be used are also presented.

Tveiten B W, Berge S, Wang X. Fatigue Assessment of Aluminum Ship Details by Hotspot Stress Approach[J]. Journal of Offshore Mechanics and Arctic Engineering, 2013, 135(4): 041401.

4. Reliability-Based Factors of Safety for Vortex Induced Vibration Fatigue Using Field Measurements

The development of a vortex induced vibration (VIV) fatigue factor of safety (FoS) consistent with state-of-the-art industry design practice is cast within the coherent framework of reliability analysis. The proposed methodology consists of the following steps: (i) define the failure criteria or limit-state function (ii) setup a deterministic analysis model (iii) characterize the uncertainties involved in the problem (iv) propagate the uncertainties through the deterministic model and assess the probability of failure due to VIV fatigue and (v) calculate the FoS required to achieve a given failure probability. The proposed methodology is demonstrated by determining the FoS associated with using state-of-the-art VIV prediction models to attain varying reliability levels (probabilities of failure) in a hypothetical design scenario. Prediction uncertainty is based herein on measured flow and response data for several full-scale drilling risers working in the field. Results indicate that depending on the reliability level required of a particular design, different FoS than those that currently appear in guidance may be appropriate. Results also indicate the sensitivity of the FoS to the riser and prevailing current type, analysis program and input parameters, and accumulation of conservatism in aggregate versus single-event damage predictions.

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1.geometrically parametric study of central brace scfs in offshore three-planar tubular kt-joints

Multiplanar tubular KK-joints are one of the most popular joint types in offshore structures, which are exposed to cyclic loads and fatigue damages. In this paper, a fatigue prediction method based on scaled model test is proposed. First, a scaled KK-joint, including deviations for model simplification, was designed based on sensitive analysis and similarity analysis. Then, static and fatigue tests on the scaled model under axial loading were performed, by which hot spot stress (HSS) distributions and the maximum HSS were recorded. From the test, the fatigue crack initiates from the location of the maximum HSS and propagates along the weld toe. Finally, the maximum HSS of original KK-joint was deduced by finite element analysis (FEA), and then, the fatigue life was predicted accordingly and compared with the rule-based result.

Source: Journal of Offshore Mechanics and Arctic Engineering,v 138, n 2,April 01, 2016;

ISSN:08927219,E-ISSN:1528896X;DOI:10.1115/1.4032158;Article

number: 021602; Publisher: American Society of Mechanical Engineers (ASME)

1. 在离岸三平面kk型接头中支撑结构的几何参数研究

多平面管状的KK-joints是在受到周期性载荷和疲劳损伤的海洋结构物中最受欢迎的接头型式之一。在本文中，提出了一个基于按比例缩小的模型试验的疲劳预测方法。 首先，基于灵敏度分析和相似度分析，设计一个按比例缩小的带有模型简化偏差的KK-joint模型。然后，在这个按比例缩小的模型上施加轴向载荷，进行静态和疲劳实验，记录热点应力（HSS）的分布和最大的热点应力。从实验中得出，疲劳裂纹是在最大热点应力的地方产生，然后沿着焊缝生长。最后，通过有限元分析（FEA）得出原始KK-joints的最大热点应力，然后就可以相应的预测结构的疲劳寿命，以及与有规律的结果进行对比。

2.Frequency Versus Time Domain Fatigue Analysis of a Semi-Submersible Wind Turbine Tower

The current paper deals with a study of a semisubmersible wind turbine (WT), where short-term tower base bending moments and tower fatigue damage were estimated by a frequency domain (FD) method. Both a rigid structure assumption and a generalized degree-of-freedom (DOF) model for including the first flexible mode of the turbine tower were investigated. First, response to wind and wave loads was considered separately, then superposition was used to find the response to combined wind and wave loading. The bending moments and fatigue damage obtained by these methods were compared to results from a fully coupled, nonlinear time domain (TD) analysis. In this study a three column, catenary moored semisubmersible with the NREL 5 MW turbine mounted on one of the columns was modeled. The model was inspired by the WindFloat concept. The TD simulation tool used was Simo-Riflex-AeroDyn from Marintek and CeSOS. The FD method gave a good representation of the tower base bending moment histories for wave-only analyses, for the moderate sea states considered in these analyses. With the assumption that the structure is completely rigid, bending moments were underestimated, but including excitation of the elastic tower and blades, improved the results. The wind-induced low-frequency bending moments were not captured very well, which presumably comes from a combination of nonlinear effects being lost in the linearization of the thrust force and that the aerodynamic damping model was derived for a fixed turbine. Nevertheless, standard deviations of the bending moments were still reasonable. The FD model captured the combined wind and wave analyses quite well when a generalized coordinates model for wind excitation of the first bending mode of the turbine was included. The FD fatigue damage predictions were underestimated by 0–60%, corresponding to discrepancies in standard deviations of stress in the order of 0–20%.

Kvittem M I, Moan T. Frequency Versus Time Domain Fatigue Analysis of a Semisubmersible Wind Turbine Tower[J]. Journal of Offshore Mechanics and Arctic Engineering, 2015, 137(1): 011901.

2. 半潜式风电塔架的频率和时间域的疲劳分析

本文以半潜式风力涡轮机 (WT)为研究对象，通过频率域 (FD) 法来评估短期塔基座弯矩以及塔疲劳损伤。研究了刚性结构假设和包括风电塔架一阶柔性模态广义自由度 (DOF) 模型。首先，风和波浪荷载作用下的响应是分开考虑，然后用叠加的方法来探究风和波浪载荷共同作用的响应。把通过这些方法得到的弯矩和疲劳损伤和从完全耦合、 非线性时域 (TD) 分析得到的结果进行比较。在此研究中有模拟了三个圆柱体模型，其中一个安装带有NREL 5 兆瓦机组的接触网锚泊半潜式系统。该模型的灵感来自于 WindFloat 概念。使用的TD 仿真工具是来自Marintek 和 CeSOS的 Simo-Riflex-AeroDyn。FD 方法很好的描述了关于仅有波浪载荷分析以及在分析中要考虑中浪状态的塔基的弯矩时程。假定结构是完全刚性的，虽然弯矩被有所低估，但包含弹性塔架和叶片的激励，会对结果有所改善。风倾力矩频率太低，不能很好的被测得，大概是存在线性化推力中的非线性效应的组合和以及一个固定涡轮的气动阻尼模型的推导。不过，弯矩的标准差，仍然维持在合理的范围内。当这个时风激的一阶弯曲模态广义坐标模型包含在内的时候，FD 模型就能很好的捕获风和波分析的共同作用结果。FD 疲劳损伤预测最低评估在 0-60%，相应的应力差异标准差在0—20%的范围内。

3. Application of a robust vibration-based non-destructive method for detection of fatigue cracks in structures

This paper presents a robust methodology for fatigue assessment of aluminum ship details using a hot-spot stress range approach. A series of fatigue tests of a typical aluminum ship detail was carried out to obtain a design S–N curve. The test detail was analyzed by the finite element method using several modeling techniques and element types. The results from both experimental tests and finite element analysis are discussed. Recommendations on the procedure of fatigue assessment of aluminum ships including S–N curve to be used are also presented.

Tveiten B W, Berge S, Wang X. Fatigue Assessment of Aluminum Ship Details by Hotspot Stress Approach[J]. Journal of Offshore Mechanics and Arctic Engineering, 2013, 135(4): 041401.

3. 结构疲劳裂纹的检测在振动的非破坏性方法中的应用

本文提出了一个使用热点应力范围来对铝船局部结构进行疲劳评估的强有力的方法，并开展了一系列的典型铝船的详细结构疲劳试验来获取设计 S — N 曲线。使用多种建模技术和单元类型的有限元法分析了实验的详细信息。从试验和有限元分析的结果进行了讨论。此外提出了关于铝船疲劳评估流程的建议以及 S — N 曲线的使用建议。

4. Reliability-Based Factors of Safety for Vortex Induced Vibration Fatigue Using Field Measurements

The development of a vortex induced vibration (VIV) fatigue factor of safety (FoS) consistent with state-of-the-art industry design practice is cast within the coherent framework of reliability analysis. The proposed methodology consists of the following steps: (i) define

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