长板件数控加工技术的探索与研究

结合某型机板件在数控加工中的研制生产状况和存在的问题,论述了实现各种长板件类结构零件装夹定位、刀具及其参数、加工方案及程编策略.通过这些技术措施的实施,在一定程度上解决了在加工长板类零件装夹和定位时出现的零件变形、让刀效率低、质量不稳定等问题.     

供热系统集约化运行的能耗监测及节能调节问题探讨

对我校供热系统的现状进行了分析；指出了锅炉热效率及能耗监控方面的不足，并针对锅炉热效率提高和二次网循环泵变频调节进行了节能分析计算；同时根据我校实际情况对循环泵设备配置及控制进行了分析，提出了要加强技术指标量化考核和能耗监测，提高效率、节能降耗，实现供热系统的科学化、集约化运行。     

温差法在航空机轮导轨装配中的应用

该文介绍了将机轮导轨的冷压装改为热压装工艺,从而降低了生产成本,提高了产品装配质量。     

直升机风险科目“斜坡起降”驾驶要领探讨

直升机在执行“紧急救援”和“抗震救灾”等特殊任务过程中往往不得已要进行风险科目“斜坡起降”。在这种情况下，操作上稍有不慎就会酿成重大事故，有的新机型在进行“斜坡起降”这一科目试验时甚至请国外飞行员来完成这项工作。文章就直升机“仰坡起降”、“顺坡起降”、“左横坡起降”和“右横坡起降”的操作要领作几点阐述，供飞行试验工程技术人员和飞行人员参考。     

基于测控系统的质量信息监测系统设计与应用

在测控试验现场,针对测控设备状态和测控数据的质量信息,采用智能自动监测技术对设备和测控数据进行实时监视以及动态分析,提出了科学的异常判决方法和处理方案,开发了试验质量信息综合分析实时监测系统,实现了测控流程智能化管控、测控信息自动分析处理和质量信息自动化管理。在多颗卫星的跟踪验证中,质量信息监测系统对卫星长期管理的宏参数宏配置下发、标校和目标捕获与跟踪等任务过程能够进行准确监视,可以及时监测到测控数据和测控时间的异常并报警,并能够自动生成任务实施登记表等测控质量报表。实验表明,质量信息监测系统软硬件设计完善、状态监测点设置合理、判读测控事件方法有效。     

加装吊舱对飞机操稳特性的影响及其尺寸界定

在机身等部位加装吊舱会导致飞机气动外形发生变化,为保证飞行安全,需要评估吊舱对飞机操稳特性的影响.通过CFD方法计算了某型飞机在加装不同尺寸吊舱下的气动特性,在原型机基础上通过增量法建立飞机飞行动力学模型,以必要的操稳特性指标为依据,评估加装吊舱对原型机操稳特性的影响,并结合飞行品质标准及飞机使用限制,给出了吊舱尺寸界限.结果表明,加装吊舱对原型机短周期模态、螺旋模态、定常直线平飞和俯仰拉升时的操纵有一定的影响,依据影响绘制尺寸界定区域图可为飞机改装提供依据.     

Optimization and verification of free flight separation similarity law in high-speed wind tunnel

Based on the similarity of separation time, a similarity law optimization method for high-speed weapon delivery test is derived. The typical separation state under wind load is simulated by the numerical method. The real separation data of aircraft, separation data of previous test methods, separation data of ideal wind tunnel test of previous methods, and simulation data of the proposed optimization method are obtained. A comparison of the data shows that the method proposed can improve the performance of tracking. Similarity law optimization starts with the development of motion equations and dynamic equations in the windless state to address the problems of mismatching between vertical and horizontal displacement, and to address the problems of separation trajectory distortion caused by insufficient gravity acceleration of the scaling model of existing light model. The ejection velocity of the model is taken as a factor/vector, and is adjusted reasonably to compensate the linear displacement insufficiency caused by the insufficient vertical acceleration of the light model method, so as to ensure the matching of the vertical and horizontal displacement of the projectile, and to improve the consistency between the test results of high-speed projection and the actual separation trajectory. The optimized similarity law is applicable to many existing free-throwing modes of high-speed wind tunnels. The optimized similarity law is not affected by the ejection velocity and hanging mode of the projectile. The optimized similarity law is suitable not only for the launching of the buried ammunition compartment and external stores, but also for the test design of projectile launching and gravity separation.     

试论高职院校对企业文化资源的利用

如何充分利用企业资源,有效开展工学结合、产学合作是各高职院校共同面临的课题和任务。就企业文化资源在高职院校办学和教育教学改革过程中的独特性及高职院校如何利用企业文化资源来培养技术技能型人才问题,作一些初步的分析和论述,希望引起教育研究者的思考和各类办学主体的重视。     

基于高速存储平台的高性能RS编译码器设计

目前,星载高速存储设备中采用商用RS编译码IP核来实现数据纠错功能,能够实现的编译码最高速率为800 Mbps,只能依靠多个IP核同时工作达到吉比特高速数据存取速率的要求。星载存储数据发生错误的主要原因是存储区单粒子翻转和存储介质本身特性产生的单比特数据错误。针对星载存储数据的误码特性,本文提出一种RS编译码改进算法,通过对编码算法中的剩余多项式及译码算法中的伴随多项式进行降次处理,减小编译码过程中运算的迭代次数及计算量,以及对编译码算法中的基本运算单元有限域乘法器采用子项复用技术,实现对传统RS编译码算法的改进。结果表明改进后的编译码器能达到最高数据速率为10.5 Gbps,编码器资源较单个商用IP核减少15%,译码器资源减少40%,能够满足后续高速存储平台的应用要求。     

Downsizing an orbital space robot: A dynamic system based evaluation

Small space robots have the potential to revolutionise space exploration by facilitating the on-orbit assembly of infrastructure, in shorter time scales, at reduced costs. Their commercial appeal will be further improved if such a system is also capable of performing on-orbit servicing missions, in line with the current drive to limit space debris and prolong the lifetime of satellites already in orbit. Whilst there have been a limited number of successful demonstrations of technologies capable of these on-orbit operations, the systems remain large and bespoke. The recent surge in small satellite technologies is changing the economics of space and in the near future, downsizing a space robot might become be a viable option with a host of benefits. This industry wide shift means some of the technologies for use with a downsized space robot, such as power and communication subsystems, now exist. However, there are still dynamic and control issues that need to be overcome before a downsized space robot can be capable of undertaking useful missions. This paper first outlines these issues, before analyzing the effect of downsizing a system on its operational capability. Therefore presenting the smallest controllable system such that the benefits of a small space robot can be achieved with current technologies. The sizing of the base spacecraft and manipulator are addressed here. The design presented consists of a 3 link, 6 degrees of freedom robotic manipulator mounted on a 12U form factor satellite. The feasibility of this 12U space robot was evaluated in simulation and the in-depth results presented here support the hypothesis that a small space robot is a viable solution for in-orbit operations.