为提高船舶设计效率,针对国际船级社协会(International Association of Classification Socie-ties,IACS)2006年推出的散货船、双壳油船共同结构规范CSR-BC/OT,中国船级社(China Classifi-cation Society,CCS)开发出计算软件CSR-SDP....为提高船舶设计效率,针对国际船级社协会(International Association of Classification Socie-ties,IACS)2006年推出的散货船、双壳油船共同结构规范CSR-BC/OT,中国船级社(China Classifi-cation Society,CCS)开发出计算软件CSR-SDP.该软件分为针对散货船的CSR-SDP(BC)和针对双壳油船的CSR-SDP(OT)两套,是集规范设计,载荷计算以及船体结构强度分析、评估和疲劳寿命评估于一体的船体结构设计和规范校核系统,较全面地覆盖CSR-BC/OT的要求,较好地满足CSR船舶设计和审图的需要.展开更多
鉴于国际船级社协会(International Association of Classification Societies,IACS)2006年推出的散货船、双壳油船共同结构规范CSR-BC/OT的复杂性,为减小用人工方法施加载荷、处理结果和扣除腐蚀等的工作量,降低出错率,中国船级社(Chin...鉴于国际船级社协会(International Association of Classification Societies,IACS)2006年推出的散货船、双壳油船共同结构规范CSR-BC/OT的复杂性,为减小用人工方法施加载荷、处理结果和扣除腐蚀等的工作量,降低出错率,中国船级社(China Classification Society,CCS)开发出有限元直接计算软件CSR-DSA.该软件以MSC Patran为平台,并使用PCL开发实现自动扣除腐蚀,施加载荷,校核屈服、屈曲、疲劳和细化网格等功能,覆盖CSR-BC/OT的大部分直接强度分析要求.CSR-DSA已得到广泛应用,很大程度上解决该规范带来的工作量大和计算易出错等问题,可以大大缩短船舶设计和审图的工作周期、提高计算准确性.展开更多
以某76 000 t CSR散货船为例,基于IACS散货船共同结构规范(CSR),对CSR散货船货舱区结构进行优化设计研究,通过规范计算及有限元分析探讨了散货船结构优化设计过程中的一些关键技术及注意点,以期对其他型散货船的优化设计起到一定的参考...以某76 000 t CSR散货船为例,基于IACS散货船共同结构规范(CSR),对CSR散货船货舱区结构进行优化设计研究,通过规范计算及有限元分析探讨了散货船结构优化设计过程中的一些关键技术及注意点,以期对其他型散货船的优化设计起到一定的参考作用。展开更多
In this paper a hybrid process of modeling and optimization, which integrates a support vector machine （SVM） and genetic algorithm （GA）, was introduced to reduce the high time cost in structural optimization of sh...In this paper a hybrid process of modeling and optimization, which integrates a support vector machine （SVM） and genetic algorithm （GA）, was introduced to reduce the high time cost in structural optimization of ships. SVM, which is rooted in statistical learning theory and an approximate implementation of the method of structural risk minimization, can provide a good generalization performance in metamodeling the input-output relationship of real problems and consequently cuts down on high time cost in the analysis of real problems, such as FEM analysis. The GA, as a powerful optimization technique, possesses remarkable advantages for the problems that can hardly be optimized with common gradient-based optimization methods, which makes it suitable for optimizing models built by SVM. Based on the SVM-GA strategy, optimization of structural scantlings in the midship of a very large crude carrier （VLCC） ship was carried out according to the direct strength assessment method in common structural rules （CSR）, which eventually demonstrates the high efficiency of SVM-GA in optimizing the ship structural scantlings under heavy computational complexity. The time cost of this optimization with SVM-GA has been sharply reduced, many more loops have been processed within a small amount of time and the design has been improved remarkably.展开更多
文摘为提高船舶设计效率,针对国际船级社协会(International Association of Classification Socie-ties,IACS)2006年推出的散货船、双壳油船共同结构规范CSR-BC/OT,中国船级社(China Classifi-cation Society,CCS)开发出计算软件CSR-SDP.该软件分为针对散货船的CSR-SDP(BC)和针对双壳油船的CSR-SDP(OT)两套,是集规范设计,载荷计算以及船体结构强度分析、评估和疲劳寿命评估于一体的船体结构设计和规范校核系统,较全面地覆盖CSR-BC/OT的要求,较好地满足CSR船舶设计和审图的需要.
文摘鉴于国际船级社协会(International Association of Classification Societies,IACS)2006年推出的散货船、双壳油船共同结构规范CSR-BC/OT的复杂性,为减小用人工方法施加载荷、处理结果和扣除腐蚀等的工作量,降低出错率,中国船级社(China Classification Society,CCS)开发出有限元直接计算软件CSR-DSA.该软件以MSC Patran为平台,并使用PCL开发实现自动扣除腐蚀,施加载荷,校核屈服、屈曲、疲劳和细化网格等功能,覆盖CSR-BC/OT的大部分直接强度分析要求.CSR-DSA已得到广泛应用,很大程度上解决该规范带来的工作量大和计算易出错等问题,可以大大缩短船舶设计和审图的工作周期、提高计算准确性.
基金Supported by the Project of Ministry of Education and Finance (No.200512)the Project of the State Key Laboratory of Ocean Engineering (GKZD010053-10)
文摘In this paper a hybrid process of modeling and optimization, which integrates a support vector machine （SVM） and genetic algorithm （GA）, was introduced to reduce the high time cost in structural optimization of ships. SVM, which is rooted in statistical learning theory and an approximate implementation of the method of structural risk minimization, can provide a good generalization performance in metamodeling the input-output relationship of real problems and consequently cuts down on high time cost in the analysis of real problems, such as FEM analysis. The GA, as a powerful optimization technique, possesses remarkable advantages for the problems that can hardly be optimized with common gradient-based optimization methods, which makes it suitable for optimizing models built by SVM. Based on the SVM-GA strategy, optimization of structural scantlings in the midship of a very large crude carrier （VLCC） ship was carried out according to the direct strength assessment method in common structural rules （CSR）, which eventually demonstrates the high efficiency of SVM-GA in optimizing the ship structural scantlings under heavy computational complexity. The time cost of this optimization with SVM-GA has been sharply reduced, many more loops have been processed within a small amount of time and the design has been improved remarkably.
