A miniature robotic plane meteorological sounding system

This article presents a miniature robotic plane meteorological sounding system (RPMSS), which consists of three major subsystems: a miniature robotic plane, an air-borne meteorological sounding and flight control system, and a ground-based system. Take-off and landing of the miniature aircraft are guided by radio control, and the flight of the robotic plane along a pre-designed trajectory is automatically piloted by an onboard navigation system. The observed meteorological data as well as all flight information are sent back in real time to the ground, then displayed and recorded by the ground-based computer. The ground-based subsystem can also transmit instructions to the air-borne control subsystem. Good system performance has been demonstrated by more than 300 hours of flight for atmospheric sounding.     

无人值守人工爆破观测记录仪

本文介绍一种无人值守人工爆破观测记录仪,采用编码数字钟控制,定时启动,脉宽调制盒式磁带记录,1980年12月在河南省初次试用,现已发展为8路记录,每路采样率为100样/秒,动态范围优于40分贝,等待功耗低于10毫瓦,总重量小于15公斤,适于野外现场操作。近年又在云南、四川等地使用,结果表明仪器性能良好,稳定可靠。     

无人值守岩体力学监测系统

按照岩体流变理论,岩体稳定和变形具有明显的时间效应,用于岩体力学参数（位移、声发射……）的监测记录系统,必须长期代替人工操作的要求。无人值守岩体力学监测系统是能满足这一要求的全自动化设备。它在自动绘制位移、应变的同时,能将岩体变形出现的声发射信息以电磁波的形式进行发射和接收,能将遥测信息进行自动记录、报警、开     

吊舱式直升机频率域电磁系统 在广东龙门地区的勘查效果

以2005年广东龙门地区1:5万比例尺的直升机航空电磁、磁综合测量资料为基础,并结合地质矿产资料,对广东龙门地区的航磁异常特征、航空电磁异常特征与矿产的关系进行了分析与研究.尤其是利用本次工作研究的电磁异常特征分类法对该区的航空电磁局部异常进行了分类,有效地识别了电磁干扰异常,优选了对找矿有意义的电磁异常.经过对优选的3处局部异常进行地面查证,空地异常对应良好,并指出了多处对找矿有意义的地下良导体.     

电子罗盘应用于无人船测向的IIR滤波性能分析

测向是无人船自动控制所需的一项重要数据,然而其通常会受到自身精度、航向突变和环境等影响,目前准确的动态测向还存在一定困难。针对所研发无人船的转向特性,在实验室内通过HMR3000电子罗盘转动实验模拟了无人船常规和极端两种转动情况,选择不同的滤波参数分析了IIR滤波特性,最后获得适用于本无人船的测向滤波参数。在无人船的湖试中,基于该电子罗盘的航向自动跟踪控制效果良好。实验结果验证了该滤波参数选择的正确性,可用于无人船的最佳滤波。     

风光互补无人监测船神经网络MPPT优化策略

为提高风光互补无人监测船长期作业的续航能力和工作稳定性,针对传统风光互补发电的优化最大功率点追踪(MPPT)控制策略需要对风力发电和光伏发电两个子系统分别进行MPPT控制而导致的综合输出功率不高问题,提出径向基函数(RBF)神经网络和单个升压(Boost)电路MPPT优化控制策略。该方案以风力发电和光伏发电两个子系统输出的电流和电压作为RBF神经网络的输入电流和电压,通过神经网络输出统一的占空比,经由单个Boost电路调整风光互补发电系统的输出电压,提高风光互补发电系统的综合输出功率。使用MATLAB仿真进行验证,结果表明此优化策略与传统MPPT控制策略相比综合输出功率更高且更稳定。     

水下UUVs集群协同定位技术发展现状及趋势北大核心CSCD

随着水下装备逐渐走向自主化、无人化、智能化,水下无人航行器(UUV)以集群的形式协同作业成为必然的发展方向。本文介绍了UUVs集群设备的发展现状及相关项目开展情况;系统梳理了UUVs集群协同定位技术在编队构型设计、观测量误差建模、模型与解算方法及水声通信技术方面取得的研究进展;重点讨论了UUVs集群协同定位技术的发展趋势,即协同编队构型设计的可视化、多源传感器误差建模的精细化、集群协同定位算法的智能化及定位结果质量控制的实时化;最后对UUVs集群协同定位技术的发展作出展望。     

Numerical Study of Submerged Vertical Plane Jets Under Progressive Water Surface Waves

When wastewater is discharged into a coastal area through an ouffall system, it will always be subjected to the action of waves. It is important to study and quantify the mixing of the discharge with the ambient water so that accurate environmental impact assessment can be made for such discharge conditions. The present work aims to study the phenomenon of a plane jet discharged into water environment with regular waves. A 3D numerical model based on the full Navier- Stokes equations （NSE） in the a-coordinate is developed to study the present problem. Turbulence effects are modeled by a subgrid-scale （SGS） model using the concept of large eddy simulation （LES）. The operator splitting method is used to solve the modified NSE. The model has been applied to the simulation of three different eases of submerged plane jets with surface waves： jet with strong waves, jet with weak waves and jet without waves. Numerical results show that the waves enhance the mixing of the jet with the ambient fluid, and cause a periodic deflection of the jet. The size of the recirculation is about 1.5- 2.4 h （water depth） . The velocity profile of the jet is serf-similar in the zone of established flow for both the pure jet and jet in wave circumstances. The spreading characteristic constant a is 0. 100 and 0. 105 for pure momentum jets with Re numbers 1025 and 2050. The value of a increases from 0. 130 to 0. 147 for a jet in weak and strong wave circumstances, showing that waves have an obvious effect on the mixing and dilution properties of jets. Numerical results are in good agreement with the experimental data for the cases of pure jets and jets with waves.     

基于LES的ROV导管推进器梢隙流动数值研究

导管推进器是一种普遍应用于无人遥控潜水器（ROV）等潜器中的特种推进器。在桨叶与导管之间的梢隙中存在非常复杂的流动,本研究基于大涡模拟（LES）对导管推进器的梢隙流动进行了数值模拟分析。通过对时间步长的收敛性研究,建立两套基于不同网格类型的计算模型。将计算结果与试验进行对比,比较两种不同类型网格模拟结果的差异发现,切割体网格能够更好地捕捉到泄涡的细节,并结合梢隙流场的原理分析泄涡发展的过程,梢隙涡的驱动力是吸力面与压力面之间的压差。此外,随着进速系数增大,梢隙周向的涡管轴向分布范围减小,主泄涡发生位置延后,泄出涡的长度和数量都有所减少。