基于IETM的航空装备数字化修理工艺系统建设需求分析

修理工艺是连接修理研发和修理生产的桥梁,贯穿航空装备修理业务的研发、生产、外场服务全流程,是航空装备修理企业的核心竞争力之一。本文以分析国营芜湖机械厂装备修理工艺技术现状和存在的主要问题为基础,基于装备电子交互式手册(IETM),提出了在航空装备修理中建立数字化修理工艺系统的典型需求、系统架构,为推进航空装备修理企业的技术、工艺文件精细化设计与管控提供了一种可行途径。     

航空装备修理科研投入成本费用问题研究

<正>基于航空装备修理科研活动在装备修理保障能力形成过程中的重要作用及意义,从航空装备修理科研现状入手,剖析了当前航空装备修理科研投入成本费用补偿机制存在的主要问题,提出了实施航修科研经费专项预算制度、设立航修科研部级专项基金、推进装备价格管理机制温和改革、积极获取国家财政资金支持、建立市场化开放型航修科研基金等多位一体的补偿机制。航空装备修理科研,是指为获得航空修理科学与技术(不包括人文、社会科学)新知识,创造性运用科学技术新知识,或实质性改进技术、产品(服务)而持续进行的具有明确目标的活动。航空修理系统根据《空军航空修理系统科     

航空部附件图像识别辅助维修设备应用及探索

基于当前航空部附件的修理模式,结合航空修理产品维修流程以及数字化图像识别技术,以实现航空装备数字化修理高效、零人为差错目标为前提,对航空部附件图像识别辅助维修设备的应用进行阐述,为加快推动航空装备数字化高效维修和图像识别技术提供一定理论参考。     

航空装备修理模式对修理成本的影响

目前,我军航空装备修理费用已占到购置费用的15%,航空装备修理成本已经成为全寿命周期成本的重要组成部分。而究其根本,航空装备修理模式是影响修理成本的关键所在,本文将从国外军机、民航飞机、国内军机三个角度出发,研究航空装备修理模式对修理成本的影响,并提出控制军机修理成本的对策建议。     

断路器风险分析在航空装备修理中的应用

对断路器开展风险分析是对航空装备修理质量的保障。针对断路器在航空装备各系统中的功用,识别出各断路器的风险级别,并将风险分析结论应用于航空装备修理中,可提高航空装备的修理质量。     

以数字化工卡为核心技术的修理新模式探索

针对航空修理企业和现状,提出以数字化工卡为核心的修理新模式,阐述了数字化工卡的概念,描述了以数字化工卡为核心的修理模型,重点针对数字化工卡驱动修理过程中各信息系统要素的修理模式进行了分析和探索,为从信息化层面有效整合航修企业各项资源,搭建快捷、高效的航空装备修理平台,加快转变航空装备修理保障能力生成模式提供了有效途径。     

航空修理中电磁兼容问题的思考

电磁兼容性是现代航空装备的重要技术指标之一,装备研制的全过程已对其进行了严格控制.但因其测量复杂且昂贵,在使用维护、修理甚至是批生产中还很少有具体的检查控制要求,相关配套的技术资料也少之又少.本文从实际问题出发,对如何在修理中保持航空装备的电磁兼容性问题进行了分析和思考.     

安徽省航空复合材料维修工程技术研究中心

正国营芜湖机械厂建有安徽省航空复合材料维修工程技术研究中心,主要承担各型军、民用航空装备先进复合材料结构损伤检测、修理及质量验证技术研发,承接航空复合材料维修领域高新技术产业化、工程化转化相关工作,为工厂深化能力建设和修理保障工作提供了有力保证。中心致力于各型航空装备先进复合材料维修技术研发工作,大力推进损伤检测、评估、修理以及修理质量验证等核心能力建设。拥有X射线计算机扫描系统(CR)、A型/C型超声检测仪等无损检测设备42台,具备各型     

复杂系统工程在基地级航空装备修理能力建设上的应用

分析了复杂系统工程发展现状及传统系统工程的局限性,紧贴当前基地级航空装备修理能力建设的发展需求,探索如何通过系统工程的全局思维视角提升航空装备修理能力建设的发展思路。     

航空装备修理技术标准体系研究

介绍航空装备维修特点、国内航空装备维修标准现状,重点阐述了航空装备修理技术标准构建思路、架构和重点研究领域。     

ν-gap度量及其在飞行控制律评估中的应用

 传统控制律评估方法主要用于单输入单输出（SISO）系统，且对模型参数摄动考虑不够全面,针对这些不足，研究了ν-gap度量方法。在介绍系统广义稳定裕度相关概念的基础上，给出了ν-gap度量的定义、特点和性质以及近似摄动模型的计算，提出ν-gap度量评估控制律的步骤。实例结果表明，该方法不仅克服了上述传统评估方法的缺陷，而且还有根据所求的各摄动影响情况忽略影响小的元素，以减少计算量及可以找到最坏情况下的参数摄动组合等优点。     

Integrated Entry Guidance for Reusable Launch Vehicle

A method for the implementation of integrated three-degree-of-freedom constrained entry guidance for reusable launch vehicle is presented. Given any feasible entry conditions, terminal area energy management interface conditions, and the reference trajectory generated onboard then, the method can generate a longitudinal guidance profile rapidly, featuring linear quadratic regular method and a proportional-integral-derivative tracking law with time-varying gains, which satisfies all the entry corridor constraints and meets the requirements with high precision. Afterwards, by utilizing special features of crossrange parameter, establishing bank-reversal corridor, and determining bank-reversals according to dynamically adjusted method, the algorithm enables the lateral entry guidance system to fly a wide range of missions and provides reliable and good performance in the presence of significant aerodynamic modeling uncertainty. Fast trajectory guidance profiles and simulations with a reusable launch vehicle model for various missions and aerodynamic uncertain-ties are presented to demonstrate the capacity and reliability of this method.     

基于飞机油箱模型形状特征油量测量切片步长选择方法研究

 在分析飞机数字式油量测量过程中目前广泛使用的切片法油量测量原理的基础上,针对现有的定步长切片法无法得到准确、可靠的燃油质量特性数据库的缺陷,结合对飞机油箱模型形状特征的分析,提出了基于飞机油箱模型形状特征的油量测量切片步长选择方法。此方法包括切片步长整体和局部选择两个过程,整体选择以实现相邻两切片平面所夹油箱模型体积近似相等为目的来确定切片步长,以体现油箱模型截面整体变化规律;局部选择以设计切片平面与截面突变平面重合或尽可能接近的方式,突出油箱截面的局部变化特征。实验结果表明：该切片步长选择方法较定步长方法能够建立更为合理、可靠的燃油质量特性数据库,从而提高了油量测量精度。     

The effect of inlet conditions on the flow and heat transfer in multiple rotating cavity with axial throughflow

This paper discusses experimental results from two different build configurations of a heated multiple rotating cavity test rig.Measurements of heat transfer from the discs and tangential velocities are presented.The test rig is a 70% full scale version of a high pressure compressor stack of an axial gas turbine engine.Of particular interest are the internal cylindrical cavities formed by adjacent discs and the interaction of these with a central axial throughflow of cooling air.Tests were carried out for a range of non-dimensional parameters representative of high pressure compressor internal air system flows(Re up to 5×106 and Rez up to 2×105).Two different builds have been tested.The most significant difference between these two build configurations is the size of the annular gap between the(non-rotating) drive shaft and the bores of the discs.The heat transfer data were obtained from thermocouple measurements of surface temperature and a conduction solution method.The velocity measurements were made using a two component,LDA system.The heat transfer results from the discs show differences between the two builds.This is attributed to the wider annular gap allowing more of the throughflow to penetrate into the cavity.There are also significant differences between the radial distributions of tangential velocity in the two builds of the test rig.For the narrow annular gap,there is an increase of non-dimensional tangential velocity V/Ωr with radial location to solid body rotation V/Ωr=1.For the wider annular gap,the non-dimensional velocities show a decrease with radial location to solid body rotation.      

二维翼段颤振的μ控制

 采用超声电机作为作动器来实现含控制面的翼段颤振鲁棒抑制。针对作者设计的二维翼段颤振主动抑制系统，通过理论与实验相结合的方法，建立了考虑沉浮方向阻尼和作动器模型参数不确定性的控制系统模型，设计了μ控制器，并对控制器做了降阶处理。数值仿真和风洞试验表明，μ控制器可有效地抑制颤振的发生，将颤振临界速度提高23.4%。相对于H_∞控制器，μ控制器的控制效果和鲁棒性更好。     

航空发动机管路测量数据分割方法

 为了提高航空发动机管路测量数据的反求建模效率,提出了一种区域增长分割算法。该方法主要是利用管路表面在曲面索引系数映射、主曲率映射、高斯映射上的特性,并基于均值漂移算法和遗传算法提出了区域分割算法中种子区域的选择策略。然后利用区域增长分割方法实现了对管路测量数据的分割。经过仿真和实测数据验证,所提管路分割算法具有较好的分割质量和效率。     

Abnormal Shape Mould Winding

为解决网格化芯模的缠绕问题,本文提出了复合材料面片缠绕机理;接着详细分析了面片缠绕过程中的芯模凹曲面上纤维滑线和架空现象,应用微分几何曲面理论和空间几何理论,提出判据及其解决方案;最后,针对飞机发动机进气道的缠绕成型,编制缠绕控制程序并进行相应的实验,验证了面片缠绕方法的可行性。     

Interfacial Properties Modification of Carbon Fiber/ Polyarylacetylene Composites

This work was dedicated to performing surface oxidation and coating treatments on carbon fibers (CF) and investigating the changes of fiber surface properties after these treatments, including surface composition, relative volume of functional groups, and sur- face topography with X-ray photoelectron spectroscopy (XPS) and atom force microscopy (AFM) technology. The results show that, after oxidation treatments, interfacial properties between CF and non-polar polyarylacetylene (PAA) resin are remarkably modified by removing weak surface layers and increasing fiber surface roughness. Coating treatment by high char phenolic resin solution after oxida- tion makes interface of CF/PAA composites to be upgraded and the interfacial properties further bettered.     

Thermal Stresses and Cracks During the Growth of Large-sized Sapphire with SAPMAC Method

本文利用有限元法对冷心放肩微量提拉法(SAPMAC)生长大尺寸蓝宝石单晶过程中的热应力进行了模拟计算,应用临界缺陷理论解释了裂纹的萌生与扩展机理。研究表明,晶体内的热应力主要与晶体生长速率,环境温度和结晶取向有关;较大热应力多出现在结晶界面,放肩、收尾以及直径急剧变化等位置;最大热应力总是出现在籽晶与新生晶体的界面附近。裂纹将在临界缺陷位置产生,并在应力作用下沿a或m面扩展。计算结果与实验结果基本吻合,通过晶体生长系统和生长工艺的改进,对晶体的开裂问题得到了有效的抑制。     

Optimization Design System for Composite Structures Based on Grid Technology

To solve the topology optimization of complicated multi-objective continuous/discrete design variables in aircmit structure design, a Parallel Pareto Genetic Algorithm （PPGA） is presented based on grid platform in this paper. In the algorithm, the commercial finite element analysis （FEA） software is integrated as the calculating tool for analyzing the objective functions and the filter of Pareto solution set based on weight information is introduced to deal with the relationships among all objectives. Grid technology is utilized in PPGA to realize the distributed computations and the user interface is developed to realize the job submission and job management locally/remotely. Taking the aero-elastic tailoring of a composite wing for optimization as an example, a set of Pareto solutions are obtained for the decision-maker. The numerical results show that the aileron reversal problem can be solved by adding the limited skin weight in this system. The algorithm can be used to solve complicated topology optimization for composite structures in engineering and the computation efficiency can be improved greatly by using the grid platform that aggregates numerous idle resources.