需求可拆分的无人机与卡车协同路径优化问题

基于无人机配送优势,提出一类无人机与卡车分区域协同配送问题。考虑需求稀疏地区由无人机配送,需求密集地区由卡车与无人机协同配送的情形。由于无人机的载重能力较小,无人机访问的顾客需求允许被拆分。结合无人机与卡车的访问路径关系,以最小化运输成本和使用卡车的人力成本为目标建立混合整数规划模型,并设计一种改进变邻域搜索算法对问题进行求解。小规模算例的特性分析表明,运输成本对无人机的载重能力及单位运输成本敏感性较高。多个不同规模的算例测试表明,改进变邻域搜索算法能在较短时间内有效求解各规模算例,且算法稳定性较好。     

“天地一体化”技术在安徽输变电工程环水保监管核查中可靠性分析

输变电工程具有空间距离长、扰动区域分散等特点,而传统环水保监管手段受人力物力限制,已无法满足工程需要,急需引入一种新的监管手段加强环水保监管工作。本文基于卫星遥感、无人机及现场核查特点,将"天地一体化"技术应用于输变电工程。结果表明,"天地一体化"技术可靠,可有效获取工程线路环水保信息,包括施工扰动范围、施工便道长宽、环水保措施等,可提高监管能力,减少人员投入和经济损失,起到减员增效的作用。     

TOD法实现光电成像系统目标识别距离检测

光电成像系统多用于对重点区域的监视和重要目标的精确跟踪、定位及引导等,其对目标的跟踪、识别能力决定了系统的作用范围,因此,对光电成像系统目标识别距离的检测具有重要意义。本文针对光电成像系统性能测试,就光电靶标设计研究,分析了传统测试方法所存在的问题,提出采用三角方向辨别阈值法,介绍了该方法的基本思想;根据被测对象,设计靶标结构及测试方法,分析了在特定环境条件下测试使用的结果,并给出试用结论。     

玻璃钢蒙皮/聚氨酯泡沫塑料夹芯结构无人机机翼制造（一）工艺方案设计

某型号无人机机翼为内部结构复杂的玻璃钢蒙皮／全容腔填充聚氨酯泡沫塑料夹芯结构,本文介绍了一种采用灌注发泡法制造该机翼的工艺技术,采用该技术制造的杨翼已经过了飞行试验并通过了系统设计定型。     

植保无人机在农作物病虫害防治中的应用分析

文章介绍了植保无人机的基本概念及其优、劣势,分析其发展现状及应用前景,最后就植保无人机的应用推广提出几点建议。     

Visual-GPS combined ‘follow-me’ tracking for selfie drones

ABSTRACT

The ‘follow-me’ mode, where the drone autonomously follows and captures the user or target, is a new and attractive feature for camera drones, especially selfie drones. For this purpose, today’s commercial drones use the difference between two GPS data in the drone and user-side mobile GCS, e.g. a smartphone, but the targeting performance is often not satisfactory due to the inaccuracy of the GPS data, ranging from a few to tens of meters. Visual tracking can be considered for a solution to this problem, but the reliability of visual tracking is still questionable for long-term tracking in un-expected operating environments. The paper proposes a hybrid approach that combines the high accuracy of a visual tracking algorithm in short-term tracking and the reliability of GPS-based one in long-term tracking. The experiment with our prototype drone system demonstrates that the proposed combined approach can accomplish the follow-me operation very successfully, capturing the target in the center of video contents over 50% higher accuracy than the GPS-based ones. Also, the extreme scenario experiments verify the system can recover vision tracking failure and Wi-Fi failure quickly in a short-term, e.g. 3–7?s.     

滑坡地表位移可视化监测系统的研究

主要介绍研究一种非接触式、可视化监测滑坡方法,利用近景摄像仪在固定测点对滑坡体表面及安装的靶标进行实时监测;将得到的数字图像进行自动分析处理,计算出地表的变形量;然后把数据无线传输到室内监测中心,结合实时滑坡外貌图像及其它监测参数进行对比印证,探索实现滑坡全过程监测预警方法。     

光电活动靶标建模及仿真分析

介绍了光电活动靶标的原理与组成，分析了光电活动靶标与被检测光电跟踪系统的空间关系数学模型，利用MATLAB仿真分析了不同设计参数对光电活动靶标性能的影响及其在工程设计中的一个实际应用．     

Radar detection of drones responding to honeybee queen pheromone

The response of honey bee (Apis mellifera L.) drones to queen pheromone(s) (either natural from a mated queen, or synthetic from a lure) was recorded using an X-band, ground-based radar. The distribution of drones (insect targets on the radar screen) changed from a scattered distribution to a line concentration (downwind) when the pheromone was released. Displacement within the line concentration was toward the pheromone. This response was seen as far as 800±15 m downwind from a lure with 10 mg of synthetic 9-oxodec-trans-2-enoic acid (9-ODA) and as far as 420±15 m from a mated queen. These studies demonstrate that queen pheromone can be detected by drones at much greater distances than previously believed and illustrate how X-band radar may be used to establish the distances at which insects of similar or larger size respond to pheromones.Mention of a commercial or proprietary product does not constitute an endorsement by the USDA.     

导弹遇靶碰撞的过载仿真分析

通过LS-DYNA显式动力学商业软件对导弹遇靶的几种典型状态进行模拟,用简化模型分析了导弹和靶机碰撞时头部的过载情况。结果表明:最大过载并非发生在碰撞初始时刻,而是在碰撞进行到一定程度时;随碰撞时弹轴与靶机轴夹角减小,最大过载减小。