共查询到20条相似文献,搜索用时 296 毫秒
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为探究水下接触爆炸载荷对大型舰船水下舷侧多舱防护结构毁伤的研究进展,从水下接触爆炸下多舱防护结构载荷特性及结构动响应2个方面综述国内外研究现状。对水下接触爆炸产生的冲击波载荷、复杂边界条件下的气泡载荷及高速破片侵彻液舱引起的冲击波载荷的研究现状进行综述;同时对水下接触爆炸下多舱防护结构的舷侧外板结构(背空板)、液舱结构及夹芯结构的响应研究现状分别进行综述。总结国内外学者对相关问题的研究成果,指出目前研究工作中存在的盲点,提出需要进一步研究和解决的问题,旨在为多舱防护结构的研究、设计和优化工作提供参考。 相似文献
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《江苏科技大学学报(社会科学版)》2017,(1)
舷侧多舱防护结构对水下爆炸载荷直接作用后的舰艇生存能力具有较大影响,研究舷侧多舱防护结构的抗冲击性能对优化和设计新型多舱防护结构具有重要意义.通过对典型舷侧防护结构在水下接触爆炸载荷作用下毁伤过程系统分析,揭示了多舱防护结构近结构在接触爆炸载荷作用下不同破坏模式机理;通过改变炸药量及多舱防护结构板厚,得到了膨胀舱外板对多舱防护结构抗冲击性能影响最大,隔板厚度不应大于膨胀舱外板厚度的结论. 相似文献
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[目的]旨在研究舰船结构在战斗部舱内爆炸下的耦合毁伤效应。[方法]以带壳弹起爆试验验证SPH-FEM耦合数值方法的有效性,对实船舱段缩比模型起爆试验进行数值计算,分析战斗部舱内爆炸时破片与冲击波对舰船结构的耦合毁伤效应。[结果]结果显示,在战斗部舱内爆炸作用下,金属壳体产生的随机高速破片群具有特殊的空间分布特征,率先引起当舱结构的局部破坏,冲击波压力加剧了局部破坏效应,结构破口进一步对舱内爆炸冲击波的传播扩散空间产生了影响,进而对相邻结构造成毁伤。[结论]研究表明:简单地将战斗部等效为裸装药的方法不能真实反映战斗部舱内爆炸对舰船结构的毁伤效果;采用SPHFEM耦合的数值方法能够良好地还原试验中战斗部对舱室结构的毁伤模式。 相似文献
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船舶操纵性是船舶的重要指标,然而各船级社近期相继删除了其规范中对舵面积的强制要求。本文基于对操纵性理论的分析和总结,对常规运输船舵面积的确定进行了方法上的探讨,为方便数值分析对吃水、舵面积比等进行了统一定义,根据系列船资料拟合出修长度与舵面积比的关系曲线,并根据操纵性试验结果对87000t散货船进行了舵面积和舵形优化讨论,在此基础上梳理出舵面积的开发思路,即舵面积比应与船体修长度在较小时成负相关关系,但当修长度大过某一数值时,需要相对较大的舵面积比。在进行货船初步开发设计时,可根据修长度数值分析结果,选用合适的舵形和舵面积。 相似文献
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采用数值分析方法,对一系列单轴受压的双向正交密加筋板进行了有限元非线性计算。基于有限元数值计算结果和正交异性板理论,引入纵向加强筋的柔度λx、横向加强筋的柔度λy以及密加筋板的柔度β这3个参数变量,提出了关于这3个参数变量的双向正交密加筋板极限强度预报公式。对3种类型加强筋的双向正交密加筋板的极限强度分析结果表明,预报公式结果与有限元计算结果的绝对误差很小,能准确预报双向正交密加筋板的极限强度。 相似文献
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The present work investigates the compressive axial ultimate strength of fillet-welded steel-plated ship structures subjected to uniaxial compression, in which the residual stresses in the welded plates are calculated by a thermo-elasto-plastic finite element analysis that is used to fit an idealized model of residual stress distribution. The numerical results of ultimate strength based on the simplified model of residual stress show good agreement with those of various methods including the International Association of Classification Societies (IACS) Common Structural Rules (CSR), leading to the conclusion that the simplified model can be effectively used to represent the distribution of residual stresses in steel-plated structures in a wide range of engineering applications. It is concluded that the widths of the tension zones in the welded plates have a quasi-linear behavior with respect to the plate slenderness. The effect of residual stress on the axial strength of the stiffened plate is analyzed and discussed. 相似文献
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The present work investigates the compressive axial ultimate strength of fillet-welded steel-plated ship structures subjected to uniaxial compression, in which the residual stresses in the welded plates are calculated by a thermo-elasto-plastic finite element analysis that is used to fit an idealized model of residual stress distribution. The numerical results of ultimate strength based on the simplified model of residual stress show good agreement with those of various methods including the International Association of Classification Societies(IACS) Common Structural Rules(CSR), leading to the conclusion that the simplified model can be effectively used to represent the distribution of residual stresses in steel-plated structures in a wide range of engineering applications. It is concluded that the widths of the tension zones in the welded plates have a quasi-linear behavior with respect to the plate slenderness. The effect of residual stress on the axial strength of the stiffened plate is analyzed and discussed. 相似文献
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复杂地质条件下,大长细比超深沉井在超软土层中下沉采取阻沉技术,在硬土层中下沉采取助沉技术,并在下沉过程中采取防倾斜、纠偏和防突沉较难技术措施,使得大长细比超深沉井垂直、均匀下沉到位,取得了较好的经济效益和社会效益。 相似文献