利用DDAM方法分析舰用增压锅炉抗冲击特性

舰用设备的抗冲击能力关系到舰船生命力,是舰船抗冲击研究的重点.文中对动态设计分析方法(DDAM)进行详细介绍,采用DDAM对某舰用增压锅炉进行抗冲击分析,计及增压锅炉不同工作状态下内压变化对冲击响应的影响,计算结果得到了增压锅炉的抗冲击特性,表明工作状态使设备抗冲击能力降低,但DDAM分析工作应力对冲击响应的影响比较保守.本文旨在对舰用设备抗冲击分析设计提供参考.     

舰船设备冲击隔离特性研究

随着冲击问题越来越多,冲击能量越来越大,冲击控制、冲击隔离问题也越来越引起人们的关注和重视。以某型舰用增压锅炉为计算研究对象,采用时域有限元分析方法．分别对增压锅炉有无隔振抗冲击装置时受到水下爆炸载荷冲击下的响应特性进行数值仿真研究。分析隔振装置对增压锅炉抗冲击性能的影响,旨在为舰船设备抗冲击性能设计及性能评估提供参考。     

船体与增压锅炉一体化抗冲击研究

为真实模拟增压锅炉与船体之间的耦合作用,将船体与增压锅炉装配在一起,在船体模型外加流场,进行爆炸数值模拟,分析求解增压锅炉在冲击载荷下的响应。同时将爆炸产生的冲击载荷以BV0430/85规范进行等效,单独加载到增压锅炉底座。两种加载方法的计算结果表明,设备与船体的耦合作用及边界条件是不可忽略的,一体化分析方法能更真实地模拟冲击环境。     

不同工作状态下增压锅炉的抗冲击特性分析

舰用增压锅炉是舰船动力系统的重要装置,目前对其抗冲击特性分析研究很少.采用时域模拟方法,对某船用增压锅炉不同工作状态下的冲击响应特性进行数值冲击试验.分析增压锅炉结构冲击响应随载荷参数的变化规律,考虑不同工作状态下内压对增压锅炉冲击响应的影响,并分析增压锅炉在不同工作状态下的抗冲击极限变化特性,旨在对增压锅炉抗冲击设计提供参考.     

水下爆炸载荷作用下舰船重要设备冲击加速度预报

预报舰船设备在水下爆炸载荷作用下的冲击环境,为选择设备提供依据,利用商用有限元软件MSC.Dytran边界加载的方法对整船响应情况进行仿真。在设备和船体基座之间安装隔振设备,大大提高了设备的抗冲击能力。计算结果对舰船抗爆抗冲击设计具有一定的参考价值。     

舰用典型设备抗冲击能力定量分析

舰用设备抗冲击性能是其技术性能的重要要素之一,正确分析舰用设备抗冲击能力也是开展系统级别抗冲击性能设计、管理、优化的前提。明确了舰用设备抗冲击能力的定义,给出了采用时域模拟法确定舰用设备抗冲击能力定量计算方法。选取某刚性安装的舰用增压锅炉为研究对象,对影响设备抗冲击能力的因素和抗冲击能力值进行了分析。旨在为今后舰船设备抗冲击性能分析提供方法和手段。     

基于DDAM的中间轴承甩油盘抗冲击性能分析

大量的实例表明舰船设备抗冲击性能薄弱是舰船生命力的短板,舰船设备的抗冲击性能是评价舰船生命力的重要指标之一。本文根据GJB1060.1-91中的动力学分析方法,对某舰船中间轴承座中的甩油盘进行抗冲击性能频域分析,得到了该设备的冲击响应特性,并按照规范对该设备进行了强度校核。     

水下爆炸作用下船舶结构与燃气轮机动态响应的数值研究

本文对水下爆炸作用下舰船结构及燃气轮机结构冲击响应进行了数值研究.首先,基于CEL方法建立了近自由面水下爆炸流固耦合动力学模型.然后结合燃气轮机-船体一体化仿真分析方法,对不同水下爆炸工况下的舰船结构冲击环境,以及燃气轮机冲击损伤特性进行了评估分析,总结了工况参数对燃气轮机冲击响应特征的影响规律,旨在为舰用燃气轮机抗冲击设计提供技术参考.     

舰船设备抗冲击能力的仿真研究

在舰船战争中很容易受敌方武器的攻击,如果是非接触爆炸并不会将船体结构击穿,但是却会严重破坏船用设备。一般情况下,船舶任务的执行需依靠设备系统,如果关键性设备系统被破坏,将严重影响其战斗能力。而且设备抗冲击能力远远低于船体,所以舰船设备抗冲击能力的增强对舰船生命力与战斗力提高十分重要。本文主要研究了船舶的动力设备振动性与抗冲击性,以及其对舰船战斗实力产生的影响,并通过数学建模对船舶设备的受力进行仿真。     

舰用设备与船体一体化强度评估方法研究

舰载复杂设备与船体之间的弹性耦合效应不可忽略,在进行舰载大型设备抗冲击数值实验时必须确定合理的技术来妥善处理外部冲击环境、舰体结构、局部结构和舰用设备之间的关系。基于主从系统耦合振动理论,以舰用炮塔结构为研究对象,设计多种冲击输入对非一体化与一体化舰炮结构进行抗冲击数值计算,并将计算结果进行对比分析,对舰用设备抗冲击分析方法以及适用范围进行探讨,旨在寻找一套适合我国国情的舰用设备抗冲击的研究方法,为舰用设备抗冲击性能设计及性能评估提供参考。     

Shock resistance of supercharged boilers through integration with ship structure

The non-linear finite element software ABAQUS was used to simulate the dynamic response of a marine supercharged boiler when subjected to impact loading. Shock resistance was analyzed by the time-domain simulation method. After exhaustive simulations,the effect of air pressure induced by different working conditions on the shock response of a supercharged boiler was reviewed,leading to conclusions about the variability of structural response with different loading parameters. In order to simulate the real impulsive environments of supercharged boilers,the integration of equipment and ship structure was then primarily used to analyze shock response. These distinctly different equipment shock test methods,run under equivalent work conditions,were compared and the causes of discrepancy were analyzed. The main purpose of this paper is to present references for the anti-shock design of marine supercharged boilers.     

水下远场爆炸下船舶结构响应计算有限元建模方式影响分析

利用有限元软件ABAQUS,针对船舶结构和设备采用不同建模方式,建立4种水下远场爆炸载荷作用下全船结构冲击响应计算的有限元模型,对比分析船体结构局部与总体冲击响应。结果表明:船舶骨材结构与设备的建模方式对结构局部冲击响应如加速度、应力等影响很大,而对结构的总体响应如剖面弯矩等刚性安装设备采用质量点均摊的方式处理以减小建模的工作量。对于大型的弹性安装设备,需采用质量点和弹簧单元仔细建模。     

FEA for designing of floating raft shock-resistant system

Choosing the equipment with good shock-resistant performance and taking shock protection measures while designing the onboard settings, the safety of onboard settings can be assured when warships, especially submarine subjected to non-contact underwater explosion, that is, these means can be used to limit the rattlespace (i. e. , the maximum displacement of the equipment relative to the base) and the peak acceleration experienced by the equipment. Using shock-resistant equipments is one of shock protection means. The shock-resistant performance of the shock-resistant equipments should be verified in the design phase of the equipments. The FEA (finite element analysis) software, for example, MSC. NASTRANw, can be used to verify the shock-resistant performance. MSC. PATRAN and MSC. NASTRAN are used for modeling and analyzing the floating raft vibration isolating equipment. The model of the floating raft and the floating raft vibration isolating system are theoretically analyzed and calculated, and the analysis results are in agreement with the test results. The transient response analysis of the system model follows the modal analysis of the floating raft vibration isolating system. And it is used to verify the shock-resistant performance. The analysis and calculation method used in this paper can be used to analyze the shock-resistant performance of onboard shock-resistant equipments.     

Dynamic response of a surface ship structure subjected to an underwater explosion bubble

Bubble load in a noncontact underwater explosion can cause the ship hull global response and local response. In current literature, the ship hull is usually simplified as a hull girder to analyze its global response. However, literature dealt with the local response of a 3-D surface ship hull subjected to an underwater bubble were limited. This investigation develops a procedure which couples the finite element method with doubly asymptotic approximation (DAA) method to study the problem of transient responses of a ship hull structure subjected to an underwater explosion bubble. Using a 3-D ship model as examples, the global and local responses of the ship model in vertical, transverse and longitudinal directions are performed in detail. The acceleration, velocity and displacement time histories are presented. The characteristics of both the global and local responses of the ship model are discussed. The numerical results show that besides global whipping response, the ship hull also sustains severe local responses in different directions subjected to underwater explosion bubble jetting, which should be taken into consideration.     

水下非接触爆炸作用下潜艇生存概率研究方法分析

建立了一种在进行潜艇生存能力评估过程中，潜艇设备所受冲击加速度的计算方法。将艇体看成初级质量，先求出艇体各处的响应，并把设备看作次级质量，以艇体相应部位的冲击响应输入，然后对设备的冲击响应进行求解，最终给出计算设备损伤概率的计算机仿真流程图。此方法已成功运用于船模实验。     

Dynamic response of the non-contact underwater explosions on naval equipment

Shock resistance capacity of the shipboard equipment especially for large ones, has been a strong concern of navies all over the world for a long time. The shipboard equipment have previously generally been studied separate from hull structure before. In this paper the coupling elastic effect between equipment and hull structure is taken into account. With the ABAQUS software, the integrated model of the equipment coupled with the hull structure is established to study the dynamic response of the shipboard equipment to the shock wave load as well as the bubble pulsation load. In order to verify the numerical method, the simulated results are compared to the experimental data, which are from a specific underwater explosion on an actual ship. On this basis, by changing the charge location, attack angle, equipment installation location and other parameters, the characteristics of dynamic response under different conditions can be obtained. In addition, the results of the integrated calculation and the non-integrated one are compared and the characteristic parameters which affect the equipment shock response are analyzed. Some curves and conclusions are obtained for engineering applications, which provides some insights into the shock resistance of shipboard equipment.