光流场测试图像序列和真实数据生成方法

本文提出了一种利用光线跟踪算法生成光流场测试图像序列和真实数据的新方法，用该方法得到的图像序列和真实数据可用于光流场算法的定量比较和定性分析，对光流场计算有重要意义。     

全尺寸飞行器地面振动试验数字化协同探索与实践

全尺寸飞行器地面振动试验是飞行器研制的必须试验,具有协调界面多、试验系统复杂、实施周期长、试验风险高等特点,面向先进飞行器高效协同研制需求,必须引入数字化手段提升物理试验能力。本文通过梳理传统模式飞行器地面振动试验流程,剖析数字化协同试验要素,从试验方案与实施流程的数字化、试验对象的数字化、试验系统的数字化等方面出发,探索并初步构建了全尺寸飞行器地面振动试验的数字化方案。结合某全尺寸火箭地面振动试验案例表明,当前数字化协同模式对降低试验风险、提高试验效率具有显著助益,未来需进一步推进数实融合仿真、应用平台开发,以推动该技术模式成熟落地。     

地效飞行器波浪地面飞行气动性能数值研究

 使用Fluent软件求解非定常可压缩流动的质量加权平均N-S方程和标准k-ε湍流模型,采用滑移网格技术数值模拟地效飞行器在波浪地面上方飞行的全机流场,研究波浪地面对气动性能的影响。在余弦波浪地面上方飞行,气动力呈现周期性,文中给出了一个周期内气动力的变化规律,分析了飞行高度和迎角对气动力平均值和气动力波动幅度的影响规律。一个周期内翼剖面的压力分布表明,波浪地面主要影响机翼下表面的压力分布,对机翼上表面的压力分布影响很小。     

Application of Road Information in Ground Moving Target Tracking

A new algorithm is developed to achieve accurate state estimation in ground moving target tracking by means of using road information. It is an adaptive variable structure interacting multiple model estimator with dynamic models modification （DMM VS-IMM for short）. Firstly, road information is employed to modify the target dynamic models used by filter, including modification of state transition matrix and process noise. Secondly, road information is applied to update the model set of a VS-IMM estimator. Predicted state estimation and road information are used to locate the target in the road network on which the model set is updated and finally IMM filtering is implemented. As compared with traditional methods, the accuracy of state estimation is improved for target moving not only on a single road, but also through an intersection. Monte Carlo simulation demonstrates the efficiency and robustness of the proposed algorithm with moderate computational loads.     

机载电子显示器接地设计一例

从产品实际应用过程中发现的问题出发，通过试验，阐述了接地设计中“地环路”的影响及其解决方法。     

起落架四点布局无人机地面运动研究

以起落架四点布局无人机为研究对象,在考虑摩擦力、侧向力和角速率等各种因素的情况下,全面分析研究了四轮无人机地面滑跑时的运动特点和受力情况,建立了四轮无人机地面运动的动力学方程和运动学方程。在此基础上,对全量非线性模型进行了起飞、着陆时地面滑跑情况的仿真,仿真结果表明了系统模型的正确性。     

舰载机斜板滑跃起飞情况地面载荷

设置舰艏斜板以减少舰载机起飞滑跑距离、降低甲板风要求,从而实现无弹射系统情况下的短距起飞作业,这已在一些“蓝水”海军强国的航空母舰上得到了多年应用。给定航母起飞甲板长度和斜板曲线构型,飞机能否成功滑跃起飞取决于它的气动特性、最大起飞质量、发动机推力、出口速度和起落架强度。 本文提出了一种舰载机斜板滑跃起飞情况地面载荷的计算方法,也建立了完整的斜板曲线方程（曲线已经过飞机适配性优化）。文中还应用本方法计算了某双座多用途舰载教练机的滑跃起飞地面载荷。     

地效飞行器近波浪地面大迎角飞行分离流动数值研究

数值模拟了地效飞行器近波浪地面大迎角飞行的分离流场,研究飞行高度和地面波浪对气动性能的影响.使用Fluent软件求解非定常可压缩流动的质量加权平均NS方程和标准k-ε湍流模型,使用滑移网格处理地效飞行器和波浪地面间的相对运动.飞行高度降低,机翼上翼面的附着流动转化为分离流动.波浪地面飞行气动力平均值和水平地面飞行气动力随飞行高度变化的规律完全一致.     

Rosetta Ground Segment and Mission Operations

At the European Space Operations Centre in Darmstadt (Germany) the activities for ground segment development and mission operations preparation for Rosetta started in 1997. Many of the characteristics of this mission were new to ESOC and have therefore required an early effort in identifying all the necessary facilities and functions. The ground segment required entirely new elements to be developed, such as the large deep-space antenna built in New Norcia (Western Australia). The long duration of the journey to the comet, of about 10 years, required an effort in the operations concept definition to reduce the cost of routine monitoring and control. The new approaches adopted for the Rosetta mission include full transfer of on-board software maintenance responsibility to the operations team, and the installation of a fully functioning spacecraft engineering model at ESOC, in support of testing and troubleshooting activities in flight, but also for training of the operations staff. Special measures have also been taken to minimise the ground contact with the spacecraft during cruise, to reduce cost, down to a typical frequency of one contact per week. The problem of maintaining knowledge and expertise in the long flight to comet Churyumov–Gerasimenko is also a major challenge for the Rosetta operations team, which has been tackled early in the mission preparation phase and evolved with the first years of flight experience.     

全尺寸旋翼试验塔无地效试验

本文介绍了利用旋翼试验塔进行全尺寸旋翼无地效试验的情况,包括试验系统组成、试验方案、试验内容及状态等,并将其试验结果与有地效试验进行了比较。试验表明,在旋翼试验塔进行试验能够很好的满足旋翼无地效试验的要求,所得结果有效反映了旋翼的无地效性能指标,并提示在同一地效高度下地面效应对单位功率产生的额外拉力基本上恒定而不随功率状态变化。