舵机试验台流量、压力现场校准技术研究

通过对流量、压力现场校准方法的研究和相应校准装置的研制,实现了对某型号舵机试验台流量、压力测量系统的现场校准。     

高姿态稳定度敏捷卫星的VSCMGs操纵律研究

  研究采用变速控制力矩陀螺群（VSCMGs）作为姿态控制执行机构的高姿态稳定度敏捷卫星的操纵律设计问题。将VSCMG分为控制力矩陀螺(CMG)和动量轮(MW)两种工作模式,针对每种工作模式进行奇异性分析,并给出逃避奇异的方法。为了获得较好的控制效果,还研究了VSCMG群转子转速向标称转速平衡的方法以及通过调整转子轴构型使转子转速快速返回到标称值的方法。最后通过对算例进行仿真,验证了所设计的操纵律的有效性。     

功率电传机载作动系统方案分析

综述了目前正在验证中的各种功率电传机载作动系统的发展状况,并详尽描述其工作原理,在分析其各自的优缺点之后,针对当今技术发展现状以及新型作战飞机对作动系统的要求,提出了两种新型的功率电传作动系统——电机-泵复合控制功率电传作动系统和电机-泵-阀复合控制功率电传作动系统,初步实验分析证明了该两种方案作为向全电作动系统的过渡是可行的,将对未来机载作动系统的研制具有实际指导意义.      

干涉SAR卫星编队波束同步方法

考虑到干涉SAR卫星编队姿态偏航导引要求,提出了两种兼顾偏航导引的编队波束同步方法。第一种方法结合星地、星间位置关系并通过坐标变换,规划了使系统满足波束同步要求的卫星姿态。考虑到该方法建模抽象、求解繁琐等不足,又提出了基于欧拉旋转的波束同步方法。数值仿真结果表明,两种方法均可有效实现系统波束同步,且后者效果更优。     

大型飞机地面转弯操纵方法研究

分析了飞机地面转弯运动时的受力特点及几何关系,参考国外相关飞机,给出了大型飞机地面转弯操纵方法,特别是大型飞机在小宽度道面完成180?转弯掉头操纵要领,并经飞机地面试验验证,该方法可以在小宽度道面上实现顺畅掉头。     

小型化高负载飞行器前轮转弯控制系统研究

介绍了一种前轮转弯控制系统,主要由转弯机构、控制器和位移传感器组成。转弯机构采用丝杠拨叉式传动方案,实现小型化、高负载的要求;控制器采用双冗余422总线通信设计方案,保证通信链路可靠性;通过采集线位移、角位移传感器两路反馈信号,实现位置闭环运算和前轮摆角实时监测。经地面及飞行试验验证,本系统各项指标均能满足要求。     

集成主动转向功能的电动助力转向参数优化(英文)

建立了融合主动转向功能的电动助力转向系统(新型EPS系统)动力学模型和整车三自由度转向模型;提出了新型EPS系统转向路感、转向灵敏度和转向稳定性的概念及量化公式;并根据多元函数有约束优化问题的特点设计了遗传算法。以转向路感为优化目标,以转向稳定性和转向灵敏度为约束条件,对EPS系统参数进行了多参数变量优化设计。仿真结果表明:应用多目标遗传算法进行EPS系统参数优化可在保证系统具有较好的转向稳定性和转向灵敏度基础上,有效提高了系统的转向路感,为新型EPS系统的设计和优化提供了理论基础。     

浅谈空客适航限制项目(ALS)的管理

从空客适航限制项目(ALS)的定义和分类出发,介绍了适航限制项目各个部分项目的来源、内涵意义及控制要求,分享了ALS的管理方法,提出从文件接收到文件评估以及将文件纳入客户化维修方案进行管理控制的完整管理方案,最后结合案例分享了ALS管理的成功经验,为航空公司管理空客适航限制项目提供参考。     

Ground maneuver for front-wheel drive aircraft via deep reinforcement learning

The maneuvering time on the ground accounts for 10%–30% of their flight time, and it always exceeds 50% for short-haul aircraft when the ground traffic is congested. Aircraft also contribute significantly to emissions, fuel burn, and noise when taxiing on the ground at airports. There is an urgent need to reduce aircraft taxiing time on the ground. However, it is too expensive for airports and aircraft carriers to build and maintain more runways, and it is space-limited to tow the aircraft fast using tractors. Autonomous drive capability is currently the best solution for aircraft, which can save the maneuver time for aircraft. An idea is proposed that the wheels are driven by APU-powered (auxiliary power unit) motors, APU is working on its efficient point; consequently, the emissions, fuel burn, and noise will be reduced significantly. For Front-wheel drive aircraft, the front wheel must provide longitudinal force to tow the plane forward and lateral force to help the aircraft make a turn. Forward traction effects the aircraft’s maximum turning ability, which is difficult to be modeled to guide the controller design. Deep reinforcement learning provides a powerful tool to help us design controllers for black-box models; however, the models of related works are always simplified, fixed, or not easily modified, but that is what we care about most. Only with complex models can the trained controller be intelligent. High-fidelity models that can easily modified are necessary for aircraft ground maneuver controller design. This paper focuses on the maneuvering problem of front-wheel drive aircraft, a high-fidelity aircraft taxiing dynamic model is established, including the 6-DOF airframe, landing gears, and nonlinear tire force model. A deep reinforcement learning based controller was designed to improve the maneuver performance of front-wheel drive aircraft. It is proved that in some conditions, the DRL based controller outperformed conventional look-ahead controllers.     

一种柱面共形单脉冲相控阵天线

为满足导引头大视角探测及波束快速扫描等需求,设计了一种柱面共形单脉冲相控阵天线。阐述了其系统组成及工作原理,详细论述了该天线的设计方法,并对它的馈电及开关网络、波束控制等关键技术进行了分析。对研制的天线原理样机进行测试,实测方向图表明该天线很好地满足了工程需求。