Fe—Ni—Cu—C合金粗粉注射成形的热脱脂工艺研究

对平均粒度为60μm的Fe—Ni—Cu—C合金粗粉注射成形坯进行了热脱脂，用差热分析仪测定了粘结剂各组元的DTA和TGA曲线，制定了合理有效的热脱脂工艺。结果表明：对于石蜡基多聚合物粘结剂体系，采用分步热脱脂，有利于维持坯体形状；热脱脂的升温速率对脱脂坯质量影响显著。     

Ignition models and simulation of solid propellant of thermodynamic undersea vehicle

The starting characteristics of thermodynamic undersea vehicle systems are determined by the geometry, size and combustion area of solid propellants, which directly effect liquid propellant pipeline design. It is necessary to establish accurate burning models for solid propellants. Based on combustion models using powder rings and two different solid ignition grains, namely star-shaped ignition grains and stuffed ignition grains, a mathematic model of the ignition process of the propulsion system was built. With the help of Matlab, a series of calculations were made to determine the effects of different grains on ignition characteristics. The results show that stuffed ignition grain is best suited to be the ignition grain of a thermodynamic undersea vehicle system.     

路基稳定性无损检测方法技术研究

研究目的:通过路基稳定性检测可测出基床强度(承载力)、道碴陷槽、翻浆冒泥等基床病害,同时还要满足不干扰行车、安全、快速、经济、可靠等客观条件的要求。研究方法:针对过去路基检测要破损路基,且不能全面反映路基的现状,结合实际采用无损检测技术对路基进行全面研究,从而对路基稳定性作出评价。研究结果:用地质雷达和瞬态瑞雷波法等检测技术检测既有铁路路基,通过测定适当的物理量,并与规范数值进行相关比较,准确地揭示出路基现状及病害,并对既有铁路路基稳定性作出评价。研究结论:用地质雷达和瞬态瑞雷波法等检测既有铁路路基,总结出一整套操作性较强的快速、准确、简便、无损、有效的检测方法;可准确地揭示出路基现状及病害,并可对检测区段路基稳定性作出评价,使既有线提速路基稳定性检测在质和量两方面得到较大提高和突破;成果已得到了广泛推广应用,经济和社会效益显著。     

两船在波浪中靠帮模型运动的试验预报

近来由于航道以及水域的限制，两船或多船定点靠帮进行装卸货物或补给越来越普遍，两船或多船之间相互影响也越来越引起工程师们的关注。通过两种船型（驳船和双体船）在4级上限和5级上限海况下分别与大船（panamax）进行靠帮的水池模型试验研究，给出它们的实船预报以及对应位置处的碰撞概率，分析两种船型在靠帮中运动的优劣，试验结果可为工程设计单位提供参考。     

The development of a stochastic non-linear and dynamic jack-up design and analysis method

This paper describes the development of a non-linear, dynamic jack-up analysis method in the time domain. It provides background as to why and when such analysis is required.

The theoretical background of the methods applied are discussed and the main features of the programme are described.     

提速铁路过渡段的动力响应测试分析

为了评价提速线路路桥过渡段对于轨道结构动力响应的改善程度,本文对京九线过渡段的设计及轨道动力响应测试进行了研究,过渡段的设计采用20m的级配碎石填筑,轨道动力响应测试参数为钢轨垂直力、钢轨加速度、轨枕加速度。测试表明,当路桥连接处设了轨道过渡段时,列车从低刚度轨道到高刚度轨道时,钢轨垂直力、钢轨加速度、轨枕加速度是由小逐渐增大的,没有突变;当列车从高刚度轨道到低刚度轨道时,钢轨垂直力、钢轨加速度、轨枕加速度是由大逐渐减小,没有突变。当路桥连接处没有设置轨道过渡段时,列车从高刚度轨道到低刚度轨道运行时,其动力响应突然减小,有突变。通过对设有过渡段及没有设过渡段的路桥连接处实测分析可知,当列车速度小于200 km／h时,采用长度为20 m的级配碎石填筑轨道过渡段,对减小过渡段轨道动力响应非常有利。     

超大型FPSO原油质量分布模拟与水弹性响应研究

FPSO在近海油气田开发中得到了越来越广泛的应用.大多数在渤海海域服役的FPSO工作在浅水海域.主尺度大与水深吃水小,直接导致FPSO水动力特性与深水条件下船舶的水动力特性有较大区别,因此采用水弹性理论研究超大型FPSO在浅水中的运动与波浪诱导载荷响应具有重要意义.浅水超大型FPSO满载时原油重量将近占载重量的80%,因此如何正确模拟原油重量分布对干结构的固有频率、广义质量和振型的计算非常重要.本文建立了基于三维水弹性理论的数值模型,开发了有限水深复合格林函数的数值计算程序模块,对一艘300K DWT FPSO在特定水深海况下的运动与波浪载荷响应进行了研究;同时采用三种方法模拟了原油质量分布.计算结果表明,不同的原油质量分布模拟方法对水弹性计算分析影响很大.     

船舶在远场水下爆炸载荷作用下动态响应的数值计算方法

提出了一个利用MSC／DYTRAN数值模拟水面船舶在远距离水下爆炸载荷作用下动力响应的方法。用FORTRAN语言编译用户子程序，在近场水域边界处加上冲击波载荷以模拟远场爆炸效应，进而利用DYTRAN中强大的流固耦合计算功能，计算船体在水下冲击波作用下的动态响应。同时研究了边界定义和单元划分对冲击波传播的影响。该方法弥补了DYTRAN计算远场水下爆炸的某些不足，计算所得到的船体附近的自由场压力与经验公式的结果基本一致，船体的冲击响应与相关实验结果比较表明本文计算结果可信。     

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.