Adaptive functional link network control of near-space vehicles with dynamical uncertainties

The control law design for a near-space hypersonic vehicle（NHV） is highly challenging due to its inherent nonlinearity,plant uncertainties and sensitivity to disturbances.This paper presents a novel functional link network（FLN） control method for an NHV with dynamical thrust and parameter uncertainties.The approach devises a new partially-feedback-functional-link-network（PFFLN） adaptive law and combines it with the nonlinear generalized predictive control（NGPC） algorithm.The PFFLN is employed for approximating uncertainties in flight.Its weights are online tuned based on Lyapunov stability theorem for the first time.The learning process does not need any offline training phase.Additionally,a robust controller with an adaptive gain is designed to offset the approximation error.Finally,simulation results show a satisfactory performance for the NHV attitude tracking,and also illustrate the controller＇s robustness.

Analysis on Attenuation Efficiency of Lightning Current by Lightning Interceptor

Lightning interception technology is one of the three core technical systems of regional lightning protection theory.Among them,the omni-directional multi-pulse lightning interceptor(hereinafter referred to as lightning interceptor,the same below)has the ability to attenuate lightning current≥40%and significantly reduce the intensity of the spatial electromagnetic field around the lightning point.In order to explore the attenuation mechanism and effect of lightning interceptor to lightning current,this paper analyzed a lightning stroke process at 16:00 on August 19,2022,and tried to explain the attenuation effect of lightning interceptor to lightning current with the physical parameters of lightning stroke.

基于SSM框架图书借阅管理系统的研究与实现

基于SSM(Spring+spring MVC+Mybatis)框架研究并实现了一个图书借阅管理系统,前台页面使用当前主流的BootStrap和jQuery框架实现,通过配置拦截器对用户访问的路径进行判断,以实现权限控制。实现程序有很好的可移植性、兼容性、可扩展性以及数据处理的高效性。

阻流板对规则波中船舶阻力及运动特性影响研究

[目的]旨在分析阻流板对规则波中船舶阻力及运动特性的影响。[方法]以一条半排水型方尾船为研究对象,基于RANS方法并结合重叠网格技术进行阻流板安装前后船舶在规则波中的阻力与运动特性数值仿真,总结船舶阻力、姿态与运动响应随波长与航速的变化规律。[结果]结果表明:阻流板在规则波中的减阻率比静水减阻率大1.03%~2.43%;阻流板对垂荡和纵摇传递函数的影响随着波长的增大而变大,λ=2L_(PP)工况下的垂荡传递函数T_(F3)和纵摇传递函数T_(F5)平均降低了3.5%和1.4%;当船舶出现甲板上浪时,阻流板可使T_(F3)和T_(F5)的降低率分别达到9%和3%。[结论]研究方法与研究成果可为船舶节能装置设计与性能预报提供技术参考。

一种分布式协同拦截制导方法及半实物仿真验证

针对考虑速度大范围时变的多拦截弹集群协同拦截问题,提出了一种基于距离协同的、可自由配置弹间通信数量的分布式协同制导方法。其中,基于扩张函数将弹目距离协同转化为期望速度前置角的求解,能够更好地适应拦截弹大范围速度变化,结合比例导引设计了动态逆控制器实现对期望速度前置角的有效跟踪。同时构建了集群半实物仿真系统,在三种不同场景下进行了集群半实物仿真试验。试验结果表明,本文所提算法能够有效提高多拦截弹集群的同时命中效果,验证了协同制导算法的有效性和鲁棒性。

豪华邮轮全船线型优化及截流板设计

为了降低航行阻力,满足豪华邮轮营运经济性的需求,对某8万总吨级豪华邮轮进行了基于阻力性能的全船线型优化及截流板设计。首先,结合CAESES的半参数化变形和SHIPFLOW的势流计算方法,针对目标船进行了兴波阻力最小化的线型优化,再对典型优化方案采用STAR-CCM+计算粘流总阻力,评估优化效果;其次,针对优化的船型方案进行了截流板的设计,进一步降低船型总阻力;最后,通过模型试验验证优化效果。试验结果显示,优化线型安装优选截流板后相对于原型实船有效功率下降了7.8%,证明了所采用的豪华邮轮线型优化和截流板设计方法的可行性。

Optimal structural design for a certain near-space composite propeller of airship using adaptive region division blending model

Near-space airship is a frontier and hotspot in current military research and development,and the near-space composite propeller is the key technology for its development.In order to obtain higher aerodynamic efficiency at an altitude of 22 km,a certain near-space composite propeller is designed as a long and slender aerodynamic shape with a 10 m diameter,which brings many challenges to the composite structure design.The initial design is obtained by the composite structure variable stiffness design method using based on fixed region division blending model.However,it weighs 23.142 kg,exceeding the required 20 kg.In order to meet the structural design requirements of the propeller,a variable stiffness design method using the adaptive region division blending model is proposed in this paper.Compared with the methods using the fixed region division blending model,this method optimizes region division,stacking thickness and stacking sequence in a single level,considering the coupling effect among them.Through a more refined region division,this method can provide a more optimal design for composite tapered structures.Additionally,to improve the efficiency of optimization subjected to manufacturing constraints,a hierarchical penalty function is proposed to quickly filter out the solutions that do not meet manufacturing constraints.The above methods combined with a Genetic Algorithm(GA)using specific encoding are adopted to optimize the near-space composite propeller.The optimal design of the structure weighs 18.831 kg,with all manufacturing constraints and all structural response constraints being satisfied.Compared with the initial design,the optimal design has a more refined region division,and achieves a weight reduction of 18.6%.This demonstrates that a refined region division can significantly improve the mechanical performance of the composite tapered structure.

基于MADIS的Interceptor技术实现分布系统的数据加密传输

本文结合MADIS的Interceptor技术,探讨了用Delphi开发基于Socket连接的三层分布式应用系统的安全性的问题,并给出了数据加密传输的解决方案。

弹载红外探测器对拦截弹的探测能力分析

在弹载平台上加装红外探测器,从而对拦截弹进行探测和预警,是提高弹载平台突防和生存能力的创新性手段。本文针对弹载红外探测器对拦截弹的探测能力,分析了拦截弹的红外辐射特性,并推测了用于探测拦截弹的红外探测器参数。同时,根据探测概率和输入信噪比的关系以及基于辐射差的信噪比模型推导了探测概率模型。在此基础上,分析了对末段、中段防御拦截弹的探测需求,从探测概率、作用距离两个方面对弹载红外探测器的探测能力进行了分析。分析结果表明:弹载红外探测器对末段拦截弹具有较强的探测能力,对于中段拦截弹只有在日照区能够保证探测需求,而在日影区只在一定探测视角下具备探测能力。

利用Interceptor实现分布式环境下的负载平衡

CORBA是当前广泛采用的分布式对象平台,它成功解决了异构平台的互操作问题。为了解决CORBA的分布式系统性能,负载分布成为CORBA应当考虑的问题,然而OMG对负载平衡却没有做出任何规范。本文给出了利用OMG的Interceptor进行静态负载分布和动态负载分布的基本模式以及部分应注意的问题。最后,通过试验分析了这2种模式的性能。

采煤机和掘进机的截齿失效原因及改进措施

采煤机和掘进机使用的截齿容易出现失效问题。正确分析截齿失效形式,是提高截齿使用效率的关键。截齿失效形式主要有磨损失效、断裂失效、刀头脱落失效、腐蚀失效。针对这些失效形式,需要对截齿的材料、结构和表面处理等方面进行改进和优化,例如采用新型材料、改变截齿的结构、加强表面处理等方法,从而延长截齿的使用寿命。同时,人们也需要加强对截齿的维护和更换,及时发现并处理截齿失效问题,确保采煤机和掘进机的正常运转,提高煤矿生产效率。

Evaluation of bioefficacy ofα-cypermethrin in long lasting impregnated net(Interceptor~) using analytical method

Objective:To evaluate relationship betweenα-cypermethrin residues in Interceptor~? nets by using HPTLC methods and mortality percentage in standard WHO’s method 'cone test' after repeated washings.Methods:Interceptor~? containingα-cypermethrin was provided by BASF Company.The washing procedure and bioassay tests were carried out according to the WHO-recommended methods.Malaria vector,An.stephensi was exposed to impregnated bed net for three minutes and then mortality measured after 24 hour recovery period.Chemical analysis was carried out in chemical laboratory by using high performance thin layer chromatography method.Results:Result of cone bioassay method showed that washing reduced the efficacy of Interceptor~? bed net from 100%in unwashed nets to 15%at 20 washes.After 20 washes,nets contain(61.2±2.8) mg/m^2 resulting 15%mortality in cone test.Killing activity was reduced when nets were washed.Conclusions:Results will provide an essential clue for monitoring and evaluation of bioefficacy of any long lasting impregnated bed net for quality control.Findings of this study will be useful for WHO.local investigators and people who wish to use pyrethroid-impregnated bed nets for malaria vector control.

WebWork2中的Interceptor机制研究

J:2EE Web框架一方面要有足够灵活性来迎合各种需求;另一方面又必须足够稳定而且简单,不试图提供万能解决方案。拦截器机制使得Webwork2简单灵活。Webwork2简单,易学易用,能让开发者用尽可能少的工作量来有效完成任务;Web-work2灵活,允许开发者有足够的自由度来与其它技术,如SiteMesh、Velocity、Spring等相结合。对Web框架Webwork2中的核心机制——拦截器机制进行深入的研究,揭示Webwork2框架的这种简单性和灵活性的魅力所在。

网上招标系统(NIPBS)及Interceptor技术在其中的应用

介绍了网上招标系统（ＮＩＰＢＳ）的基本流程，并描述了招标系统的网络传输安全机制．利用Ｉｎｔｅｒｃｅｐｔｏｒ技术；结合目前流行的ＣＡ认证、数字签名等技术，较好地解决了网络上数据传输的安全性问题．

基于Interceptor的容错ORB原型系统

介绍了基于Interceptor机制的容错ORB原型系统的体系结构和运行机制，说明了 该容错CORBA系统设计中的一些重要问题和解决方案。对该系统的测试表明它能提供基本的 容错功能。

Factor analysis of interceptor capture probability

The capture probability of interceptors has been deeply studied.Firstly,the definition of capture probability is analyzed.It is transformed into calculating the probability that the relative position vector between the target and the interceptor locates in a certain cone.The relative position vector and associated covariance matrix are projected in line-of-sight coordinates,and the 3-dimensional integral of a probability function in a cone is calculated to obtain the capture probability.The integral equation is a complicated expression of probability,and it is simplified to an explicit approximate expression according to some assumptions based on the characteristics of the engineering problems.The approximation precision is analyzed by comparative simulation difference,which indicates that approximate assumptions are reasonable.Utilizing the explicit expression,the characteristics of capture probability are analyzed respectively with the factors,such as the distance between the interceptor and the target,the precision of relative position vector,the maximum capture distance and the maximum field angle of interceptor seeker.

Application of Comprehensive Lightning Interceptor in Highway Toll Station

Expressway toll station is listed by lightning protection experts as one of the five difficult problems in the field of international lightning protection.So far,the direct lightning protection of the expressway toll station is mainly based on the electrical geometry model-rolling ball method.Lightning rod or lightning belt is installed on the high pole lamp of the toll square and the ceiling of the toll island as a flash catching device to intercept lightning.The lightning rod is a section of metal conductor with the tip.From the process of the connection between up leader generated by the lightning rod and down leader of lightning,the lightning rod has the ability to attract the lightning rod,and can prevent lightning strike of the protected objects within a certain range.From the perspective of lightning protection methods and means,lightning protection plays an interception role against lightning discharge,also called interceptor.A large number of practice has proved that the lightning rod plays an important role in protecting the building structure from lightning damage.With the development of electronic information society,the limitations of lightning rod are more and more prominent,resulting in more and more lightning strike accidents.In 2019,China invented a new flash connection device-lightning interceptor that can overcome the limitations of lightning rod and has applied it on expressways,which has achieved remarkable results.In this paper,the physical parameters of lightning receiving process by the lightning interceptor and the lightning rod are compared,and the solution to prevent direct lightning strike at expressway toll station is proposed.

Realization of proportional navigation and lateral acceleration autopilot for endoatmospheric kinetic interceptor with pulse thrusters

The guidance and control strategy for endoatmospheric kinetic interceptor controlled by lateral pulse thrusters was detailed.The pulse thruster control system was firstly proposed.The sample-and-hold approach was introduced to design a novel lateral acceleration autopilot on the basis of traditional two-loop topology.Combined with proportional navigation guidance law and the novel autopilot,the overall ballistic trajectory was presented and examined.Simulation results show that the pulse thruster control strategy can greatly improve the control system response speed and the maximal acceleration capability for realizing kinetic kill interception.

Decrease of RMI Application Coupling Degree Based on Dynamic Proxy and Interceptor

Based on Java RMI framework, a new design is introduced to plug common services into RMI application without modifying the remote interface. This design improves the mechanism of RMI, which is based on dynamic proxy and interceptor technology. The implementation of class loader and stub is custom. The design ensures both the integrity of RMI mechanism and the plug-ins of some common services that are based on component. The design improves the modularization of application and decreases the coupling degree among different modules; by this means these middle-ware's modules gain more scalability and flexibility.

基于序列凸规划的拦截弹中制导轨迹优化

针对强非线性多约束条件下拦截弹中制导轨迹优化问题,基于序列凸规划方法和捕获区域,提出一种针对固定时间约束下的轨迹优化算法。序列凸优化方法求解复杂多项式具有高效的计算效率,但在轨迹优化问题中应用序列凸规划有控制变量的强非线性和固定时间内终端约束难以收敛两大难点。首先,采用仿射变量将问题转化为仿射系统,并将仿射系统进行凸化与离散化,来解决非线性问题,然后,提出一种终端约束加权松弛化方法来解决固定时间内终端约束难以收敛问题,并将中制导问题转化为序列凸规划问题。仿真结果表明,所提算法能较快地生成符合多约束条件的拦截弹中制导轨迹。