空调机组三维参数化设计及装配仿真

以Pro／Engineer软件为平台,探讨并开发了组合式空调机组三维参数化设计及装配仿真系统。提出了空调机组零部件采用设计变量、用户定义特征库（UDF）、表格驱动与编程相结合的三维参数化设计方法,实现了零部件三维参数化特征建模。建立了合理的装配规划,实现了段体的自动装配、约束识别及装配干涉分析。为实现空调机组产品的三维设计提供了先进的设计手段。     

深水聚酯缆系泊铺设技术与应用

随着我国海洋油气资源开发逐步走向深水,浮式生产平台及系泊系统的应用已逐渐趋于成熟,聚酯缆由于具有强度高、质量轻以及疲劳好等特性,在浮式生产平台系泊系统中具有广阔的应用前景。陵水17-2气田为我国首次应用1 500 m水深聚酯缆锚腿系泊系统,该文将针对我国南海环境条件的特点,确定适用于半潜式平台聚酯缆系泊系统的海上施工方案,从而实现聚酯缆锚腿在陵水17-2项目的工程示范应用,掌握深水聚酯缆系泊系统的安装技术,实现深水系泊应用自主化,希望能为今后类似项目和深水工程提供参考。     

单点系泊系统的模拟建模

用于系泊FPSO的单点系泊系统是海上油气生产的重要设施。该文依托实际生产项目,参考该项目中系泊系统的设计资料和相关标准规范,确定系泊系统模型中各组成部分的物理属性参数和水动力参数;利用专业的水动力软件OrcaFlex建立关于单点系泊系统的完整详细的有限元模型;通过静态分析验证了系泊系统单点转塔的静平衡位置和实际静态在位的位置是一致的。采用50年一遇的极端风暴对非完整性的单点系泊系统进行动态分析,分析结果证明非完整性的单点系泊系统在极端风暴工况下是安全的。对系泊腿钢缆展开动态铺设分析,得出钢缆铺设的天气窗口。该系泊系统的建模方法对单点系泊的更换和安装设计具有一定的参考意义。     

基于UG参数化设计系统的研究

论文是以功率超声珩磨装置的参数化建模为例,在一般零件参数化设计的基础上,提出了一种基于草图装配和草图约束的参数化设计方法。此方法是利用UG建模里的草图功能,在对零件模型进行几何约束和尺寸约束的基础上,用函数表达式建立多个零部件的变量尺寸与装配草图的关系,通过对装配草图里设计变量尺寸的管理,实现整个装置零部件之间的联动。     

雷达典型结构件快速设计系统的研究与开发

给出了雷达典型结构件快速设计系统的总体结构,并对系统功能进行了阐述.针对雷达零部件结构的相似性进行了归纳总结.对雷达典型结构件库的知识表示、参数化建模、知识库的集成、数据库的建立进行了研究.基于以上研究,开发了基于UG的雷达典型结构件快速设计系统.     

双腰轮气体流量计参数化设计研究

介绍了参数化设计概念,根据双腰轮气体流量计基本原理结构,对关键尺寸进行设置,例举了零部件参数化设计过程。基于Solidworks软件的方程式、全局变量等功能,实现整个产品设计参数互联,配合装配约束关系,进行快速参数化设计开发,节约设计成本,提高研发效率。     

面向工程的专用产品参数化CAD系统的研究

 针对目前参数化CAD系统的不足，提出了面向工程的参数化思想，引入了功能约束，分析了对功能约束进行处理的3种方法．采用了基于特征的参数化造型方法，用应用层、描述层和图形层三层体系表达基于特征的参数化模型，将该模型作为参数驱动的基础．将设计中的约束分为3类：工程约束、适配约束和几何约束．通过适配约束在工程约束与几何约束间建立映射关系，使得参数化设计系统既可以受几何参数的驱动，又可以受工程参数的驱动，从而扩大了CAD技术对设计过程支持的范围。     

基于Pro/E的货车转向架参数化设计系统的研究

将参数化设计技术应用于货车转向架的设计,通过设计参数来驱动转向架零部件的几何模型,简化生成和修改零部件模型的操作。在现有计算机辅助设计软件的基础上,运用其二次开发工具、面向对象的程序设计语言、数据库技术及其编程接口进行二次开发,实现了基于参数化设计技术的货车转向架设计系统,提高了货车转向架设计的速度和质量。     

基于特征的典型零件参数化设计

本文针对涡轮通用零部件花键、圆弧端齿和涡轮轴,先经过初步设计将限制条件和尺寸驱动参数连接起来;再通过对UG二次开发完成的参数化建模实现了对零件及特征模型的快速建模和快速修改,验证了参数化设计方法的便捷性,同时在单个零部件参数化建模开发完成之后将其整理成了一整个的典型零部件建模系统,减少其在设计过程中的重复劳动,节省设计时间。     

基于虚拟样机技术的铁路货车轴端电机结构设计

介绍了虚拟样机技术和Pro/E软件,描述了铁路货车轴端电机的结构和功能特点及其虚拟样机模型的三维设计流程.讲述了模块化理念和并行设计方法在轴端电机总体设计中的应用,并详细描述了参数化设计方法在轴端电机详细设计中的应用,主要包括零部件尺寸参数化、装配约束参数化及Pro/E提供的“外部复制几何”和“使用参照”两种参数化工具.以永磁体厚度作参数化变量为例,介绍了多学科分析在轴端电机结构设计中的作用.通过铁路货车轴端电机结构设计的实践表明:先进的三维设计技术和卓越的多学科分析方法是基于虚拟样机技术的产品结构设计的重要工具和组成部分,能有效缩短设计周期、减少设计成本,并能保证产品满足使用者的需求.     

Failure analysis of the turret bearings wear on SYS in the Bohai Bay area

In the China Bohai bay area, a Single anchor leg yoke mooring system (SYS) was mainly used for FPSO's permanent mooring due to the shallow water. This paper investigates the SYS failure and focus on the excessive wear that occurred to underwater turret bearings. The wear mechanism of bearing is researched by using morphology analysis and energy spectrum analysis. Nonlinear finite element analysis is performed to study the contact status between turret table and axial bearings considering the operational and extreme load condition. The comparison wear-test is carried out to clarify the contributions of eccentric load on the wear performance of axial bearing. Wear-test results indicate that eccentric load has a significant impact on wear of turret bearings. Eccentric wear also produce more abrasive particles to accelerate wear rate. A step-like is formed on bearing plate surface due to excessive wear. The failed bolts are attributed to stress corrosion crack under long-term shear fore caused by vessel surge motion.     

Analysis of fracture and cracks of oldham’s couplings used in anchor hoisting. Case study

The usual failure of an anchor hoisting assembly was investigated. The anchor ensures stability in cases of ship mooring in a harbor, anchorage or bay and provides adequate safety combined with convenient and easy handling. For the anchor hoisting a hydraulic motor is used consisting of a main two-speed crankshaft, the oldham’s coupling and a valve spool. The oldham’s coupling of a specific oil-tanker frequently fails during the anchor descent and blocks the whole hoisting system. Three pieces used to the same anchor were examined. Two of them exhibited total fracture while the third one had been plastically deformed. The study involved chemical analysis, hardness measurements and in-depth examination of microstructures and fracture morphologies of specimens derived from the failed parts. The paper presents conclusions related to the fracture mechanism and the type of fractures respectively. It was found that poor design and wrong material selection were the main causes of failure.     

水下嵌入式混凝土锚体锚碇力试验研究

在分析国内外现有嵌入锚锚碇力计算方法和大量物理模型试验的基础上,采用正交试验设计分析方法,定量地研究了土质、埋深、拉力角度、锚型等因素对水下嵌入式混凝土锚体锚碇力的影响程度和规律,在此基础上提出了一套更为合理的锚碇力计算公式。研究成果与已有的工程实例相吻合,并且作为国家军用标准的编制依据之一,已成功地用于实际工程中。研究的锚型和推荐的公式可用于浮码头、单点系泊系统等非临时性浮式设施的水下锚体设计。     

基于数据库的机床卡盘参数化零件设计系统的实现

介绍了ＡｕｔｏＣＡＤＦｏｒＷｉｎｄｏｗ下,一种基于数据库的卡盘参数化零件设计方法,分析了Ｆｏｘ系列数据库／表的结构,了用Ｃ语言进行参数化零件设计,ＡｕｔｏＣＡＤ的界面设计,以及Ｆｏｘ系列数据库的C语言操作通用接口设计的方法.     

深水锚泊线串联浮筒系统的动力特性分析

在时域范围内建立深水锚泊线串联浮筒系统的动力分析模型,考虑锚泊线和海床之间的接触作用,基于Morison公式计算锚泊线的惯性力和拖曳力荷载,并利用单根锚泊线由于上部浮体运动而吸收的能量来计算锚泊阻尼。分析串联浮筒系统对锚泊线张力和阻尼的影响特征,进而对串联浮筒的大小和所处位置进行参数敏感性分析。该结果对深水浮式平台锚泊系统设计中如何有效地减小锚泊张力具有实际意义。     

Multi-objective system reliability-based optimization method for design of a fully parametric concept car body

This article investigates multi-objective optimization under reliability constraints with applications in vehicle structural design. To improve computational efficiency, an improved multi-objective system reliability-based design optimization (MOSRBDO) method is developed, and used to explore the lightweight and high-performance design of a concept car body under uncertainty. A parametric model knowledge base is established, followed by the construction of a fully parametric concept car body of a multi-purpose vehicle (FPCCB-MPV) based on the knowledge base. The structural shape, gauge and topology optimization are then designed on the basis of FPCCB-MPV. The numerical implementation of MOSRBDO employs the double-loop method with design optimization in the outer loop and system reliability analysis in the inner loop. Multi-objective particle swarm optimization is used as the outer loop optimization solver. An improved multi-modal radial-based importance sampling (MRBIS) method is utilized as the system reliability solver for multi-constraint analysis in the inner loop. The accuracy and efficiency of the MRBIS method are demonstrated on three widely used test problems. In conclusion, MOSRBDO has been successfully applied for the design of a full parametric concept car body. The results show that the improved MOSRBDO method is more effective and efficient than the traditional MOSRBDO while achieving the same accuracy, and that the optimized body-in-white structure signifies a noticeable improvement from the baseline model.     

基于CATIA的飞机结构件参数化设计

以CAA作为CAITA的二次开发工具,采用面向对象和可视化界面编程技术,针对飞机结构件开发出参数化设计系统,对特征模板进行交互式参数化设计,提高了对已有设计资源的利用率,实现飞机结构件的快速响应设计．     

Failure analysis of naval vessel's mooring system and suggestion of reducing mooring line tension under ocean wave excitation

A moored ship can experience problems when subjected to heavy environmental loads. In most cases, wind and current loads are the only design considerations for the mooring situation in the harbor, and wave loads are not considered due to the low wave amplitudes in harbors. However, many new harbors are constructed near the open sea, and entrance channels are being built deeper and wider than the classical harbors. So, many cases of mooring failure due to heavy wave loads are recently being reported in harbors. In this paper, failure analysis has been performed on a ship in harbor with mooring failure. The failure analysis results demonstrated that the wave drift forces can cause failure of the mooring system. Therefore, consideration for new design of mooring system, which considers the wave loads, is suggested.     

履带行走机构自动化装配方法与系统实现

针对履带行走机构的自动化装配问题,以某型无负重轮式履带行走机构为对象,研究了自动化装配中的姿态定位和约束添加的关键问题.提出一种采用辅助草图和参考面进行姿态定位和约束添加的履带行走机构自动化装配的方法,开发了履带行走机构自动化装配系统.该方法能够大大提高装备样机设计建模的效率,将设计人员从繁琐的建模与装配工作中解脱出来．