【摘 要】
：
A 3D digital model of a small Unmanned Aerial Vehicle (UAV) is obtained by using the method of scanning reverse modeling and joint mapping.A numerical simulation of a small UAV strikes on rotary engine blades,presented in this paper,was performed with a T
【机 构】
：
School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China;Science and Technolog
论文部分内容阅读
A 3D digital model of a small Unmanned Aerial Vehicle (UAV) is obtained by using the method of scanning reverse modeling and joint mapping.A numerical simulation of a small UAV strikes on rotary engine blades,presented in this paper,was performed with a Transient Nonlinear Finite Element code PAM-CRASH software.A test of motor strike on plate was developed and the dynamic response of the plate were obtained to validate the numerical simulation method of a UAV strike on blades.Based on this,dynamic damage response caused by UAV on the engine blades were studied.It is indicated that the impact process between the UAV and a single blade can be divided into two typical stages:cutting and impact.Cutting mainly leads to the failure of the leading edge material,and impact mainly leads to the plastic deformation of the blade.At the same time,it is compared with the damage impacted by bird with the same mass.For the same mass of bird and UAV,the damage caused by UAV striking fan blade is more serious,and 1.345 kg UAV striking fan blade of typical civil aviation engine is enough to cause damage to flight safety.
其他文献
The multiple jets impingement heat transfer is widely applied in the wing anti-icing sys-tem.It is challenging to apply the similarity criterion to carry out the anti-icing experiments due to the complex flow and heat transfer behavior.In the present stud
Research on the transition phase of tail-sitter Unmanned Aerial Vehicles (UAVs) is cru-cial for trajectory planning and performance analysis.This study focuses on the analysis of the tran-sition characteristics and path of a small dual-rotor tail-sitter U
This paper addresses the robust attitude control problem for quadrotors subject to model mismatch and disturbances.A dynamic inversion based attitude control scheme is proposed,which consists of an outer loop attitude controller and an inner loop angular
An efficient method was proposed to prepare high-performance conductive Aramid-Carbon Blend Fabrics (ACBF) with cobalt-nickel (Co-Ni) alloy coatings,which is conducive to industrial production.The grid-like substrate composed of aramid and carbon fibers w
This paper reports an experimental study on the supersonic jet surface flow structure visualization and shear stress field measurement issuing from a rectangular nozzle with extended shelf.The evolution of the near-field surface flow structures with an in
文章以周宁抽水蓄能电站为例,进行了其引水隧洞充排水试验方案设计、试验过程及试验结果的分析探讨,结果表明,充排水试验是水电站引水隧洞工程施工质量检测及查找引水系统可能存在安全隐患的主要方式,在抽水蓄能电站投产发电前,其引水发电系统充排水试验必不可少。试验结果显示,该抽水蓄能电站引水系统设计合理,施工质量良好,结构性能可靠,且所采取的充排水试验程序合理,措施得当,充排水试验取得了成功。
文章从方法、原理及其应用效果的角度全面研究了锚杆质量无损检测技术,利用波形特征与锚杆注浆密实度之间的关系总结出注浆密实度、有效锚固长度、缺陷的位置及大小等锚杆施工质量问题评价方法,为工程质量评价和检测提供一种有效的无损检测技术。
规模性节水灌溉工程是影响降低我国农业水资源损耗、提高水资源利用率的重要水利工程,同时对区域水土保持工作尤其是地下水位也带来重要的影响。文章将根据新疆某片区大规模、广域型节水工程灌溉项目实例,基于数值分析预测模型,展开了节水灌溉工程对区域地下水位变化规律影响的研究,为区域水土保持工作提供指导。研究发现:①相对于土渠,混凝土节水衬砌渠道具有良好的防渗漏性能,相等水位水力作用下,30d内混凝土渠水的渗透距离仅达到土渠的7.84%,能够起到降低水资源耗费的结果;②数值分析预测模型应用模拟得出水流渗透深度呈指数型增
The optimal yawing angle of sun-tracking solar aircraft is tightly related to the solar azi-muth angle,which results in a large arc flight path to dynamically track the sun position.However,the limited detection range of payload usually requires solar air
Space manipulator with free-swinging joint failure simultaneously contains kinematic and dynamic coupling relationships,so it belongs to a new underactuated system.To allow the manipulator to carry on tasks,an effective robust underactuated control method