地面系留设施万向滑轮结构优化设计

基于系留缆绳换向及缆绳拉力和倾角的测量,提出了一种优化的机动式系留气球万向滑轮结构设计方案,描述了万向滑轮结构形式、材料选择及工艺实现等,采用三维建模及有限元分析相结合的方法,对万向滑轮结构进行校核分析。结果表明,该结构满足刚度和强度要求,具有较广泛的工程应用价值。     

Temperature effect on buckling properties of ultra-thin-walled lenticular collapsible composite tube subjected to axial compression

This paper seeks to outline the temperature effect on the buckling properties of ultra-thin-walled lenticular collapsible composite tube(LCCT) subjected to axial compression.The buckling tests of the LCCT specimens subjected to axial compression were carried out on INSTRON-500 N servo-hydraulic machine in dry state and at the temperatures of 25 C, 100 C and 80 C. The load–displacement curves and buckling initiation loads were measured and the buckling initiation mechanism was discussed from experimental observations. Experiments show that the buckling initiation load, on average, is only about 2.2% greater at the low temperature of 80 C than at the room temperature of 25 C due to the material hardening, demonstrating an insignificant increase in the buckling initiation load, whereas it is about 19.5% lower at the high temperature of 100 C than at the room temperature owing to the material softening, implying a significant decrease in the buckling initiation load. The failure mode of the LCCT in axial compression tests at three different temperatures can be reckoned to be characteristic of the buckling initiation and propagation around the central region until rupture. The finite element(FE) model is presented to simulate the buckling initiation mechanism based on the eigenvalue-based methodology. Good correlation between experimental and numerical results is achieved.     

发动机高模试验技术研究

基于ANSYS软件平台,建立了发动机高模试验系统传动轴强度和疲劳数值仿真模型,并进行了数值仿真与分析计算,研究了传动轴强度和疲劳与位移之间的关系,得出了传动轴设计准则.通过对发动机高模试验系统扩压器与氮气破空设备的研究、分析与计算,得出了储能气缸和氮气破空环管的设计准则.采用该设计准则设计的发动机高模试验系统解决了发动机试验启动过程压力过高、回火严重、发动机喷管变形等问题,试验系统满足发动机设计对高模试验的要求.通过该试验系统考核的发动机已成功应用于发射卫星的运载火箭系统.     

临时航线运行效果评估研究

依托2012—2015年福建空管分局进近情况及福州长乐国际机场航班延误情况，由专家及一线管制员为各因素不同延误等级所占比重进行打分，建立延误等级模型，再通过打分情况建立物元评估模型，得出关联隶属度评估机场综合延误程度，以及使用临时航线前后延误程度的变化，最后，得到了福州长乐机场延误影响因素及综合延误程度的定性定量分析结果。     

欧拉方程多段翼型绕流计算的嵌套网格方法

本文采用嵌合体埋入技术，将主段翼型和襟翼分成两子域，对多段翼型的复杂构型进行了分区迭代求解，在有限体体积离散的基础上，求解欧拉方程计算各子域流场的解，通过各流场的耦合迭代到多段翼型绕流的解，典型的带３０％襟翼ＧＡ（Ｗ）－１翼型算例表明，该计算方法稳定，能较地模拟多段翼型中主段翼型与襟翼交接处的复杂流动现象计算结果与实验值有较好的一致性。     

A new approach on necking constitutive relationships of ductile materials at elevated temperatures

A new method is presented to determine the full-range, uniaxial constitutive relationship of materials by tensile tests on funnel specimens with small curvature radius and finite element anal-ysis (FEA). An iteration method using FEA APDL (ANSYS parametric design language) program-ming has been developed to approach the necking constitutive relationship of materials. Test results from SAE 304 stainless steel at room temperature show that simulated load vs displacement curve, diameter at funnel root vs displacement curve, and funnel deformation contours are close to mod-eled results. Due to this new method, full-range constitutive relationships and true stress and effec-tive true strain at failure are found for 316L stainless steel, TA17 titanium alloy and A508-III stainless steel at room temperature, and 316L stainless steel at various elevated temperatures.     

航空发动机进气机匣罩模态有限元分析

通过对两种型号发动机的进气机匣罩进行三维建模和在全约束条件下进行固有模态有限元计算分析,给出了前100阶的固有频率和位移曲线。分析结果表明,A型进气机匣罩更容易发生共振,其产生裂纹或失效的风险更大。     

复合材料结构多钉连接设计、分析与试验技术

在理论研究的基础上,应用有限元法进行复合材料多钉连接的载荷分配,并通过有限元法预测连接孔的挤压强度,大大提高了分析的精度;同时利用非线性分析方法分析了复合材料对角接头多钉连接的强度,并通过试验进行了验证,为复合材料主承力结构连接强度设计、分析提供了依据,为复合材料在中、重型直升机上的应用提供了参考。     

PREPROCESSING AND POSTPROCESSING SYSTEM FOR FINITE ELEMENT COMPUTATION

研究了有限元计算中的单元自动划分、曲线处理、节点疏密处理、载荷自动分布、与优化设计的衔接和等应力线绘制等方面的技术问题，阐述了有限元平面八节点单元前后置处理软件的设计过程。     

三自由度并联机床驱动分支动力学分析

动力学分析对于并联机床的设计有着重要的意义,本文应用有限元软件ANSYS,针对一种三自由度并联机床,建立了并联机床驱动分支的有限元模型,并对其进行了模态分析,分别获得了相应的5阶固有频率及其对应的振型图,其结果可以作为并联机床整机模态分析的重要参考。