摘要：红外图像去噪在军事及民用领域应用广泛。现有基于深度学习的图像去噪方法主要为可见光图像设计,此类方法容易过度平滑图像细节,从而导致弱小目标丢失,为后续的检测任务带来困难。为了在去除噪声的同时保留好红外图像中的目标信息,本文提出了一种基于梯度可感知通道注意力模块的红外弱小目标检测前去噪网络。该网络首先采用编码器-解码器结构来去除图像中的加性噪声,然后通过梯度可感知通道注意力模块对图像高频区域进行自适应增强,有效保持红外弱小目标的响应强度。此外,本文提出了领域第一个包含3981张含噪声的红外图像数据集。实验结果表明,该网络能够在有效去除加性噪声的同时避免过度平滑,很好地保留了红外图像中的目标信息,最终实现了在含噪声环境下的高鲁棒性红外弱小目标检测。

摘要：直升机前飞时,气动环境会导致不同方位角的桨叶出现气动载荷的瞬间不对称,通过基础结构传递会在机身形成大幅度的低频振动。为了消除多方向幅值变化的振动力,利用结构响应主动控制原理,设计了基于x-LMS算法的主动消振电力作动器系统,并进行了减振实验。首先,通过比较确定了单台作动器中两台电机同向旋转的方案。通过两台作动器的组合使用,推导出输出力的数学模型。其次,采用负载相位差交叉耦合的控制策略设计系统控制框图。针对存在耦合的相位外环,通过回差阵特征值法确定满足系统稳定裕度要求的参数范围,再根据灵敏度函数和输入跟踪性能在所得的参数稳定域内寻找最优解。然后,提出了基于x-LMS算法的直升机主动振动控制系统,并通过仿真验证了该系统的减振效果。最后,研制的实验样机进行了动稳态实验以及减振实验,验证了系统的实际减振效果。

摘要：为提高灵巧机电作动器(Electromechanical actuator,EMA)系统的频率响应和抗干扰特性,并针对多作动器同步工作时的力纷争问题,提出并设计了基于双闭环负载前馈控制的多输入多输出(Multi input multi output,MIMO)位置差交叉耦合的协调控制策略。该策略利用回差矩阵奇异值法设计满足系统稳定裕度要求的参数范围,并采用灵敏度函数和H_(∞)范数理论在所得的参数稳定域内设计并确定最优解,使多作动器系统兼具优异的同步性、稳定性和抗干扰性。同时,建立了集成一体化灵巧机电作动器系统的数学模型,根据点‑点控制要求,确定并设计了双环控制和负载前馈补偿的控制器,以提高单作动器的频响和抗干扰能力。最后,搭建了270 V高压灵巧机电作动器系统实验平台,进行了频率响应、负载前馈补偿、协调控制实验,验证了位置差交叉耦合控制策略的正确性和参数设计的合理性,使系统达到带宽6 Hz、最大输出力20000 N、同步误差≤0.1 mm的伺服控制指标,有效解决了力纷争问题。

摘要：针对传统连续控制方法在计算多变量冲突解脱时计算复杂度高,并且易陷入局部最优解的问题,提出了一种动态规划-序列二次规划的组合算法(Dynamic programming-sequential quadratic programming,DP-SQP)。动态规划算法用以根据航空器间隔模型的时间特性将冲突解脱的决策过程离散为一系列易于求解的子阶段,并从初始阶段逐段递推至最终阶段解出全局最优解;针对各子阶段采用序列二次规划算法求解最优值函数以及最优控制律。通过设计与传统算法的对比仿真,验证了组合算法的优越性。通过设计跟驰和交叉冲突仿真实例验证了组合算法对于不同冲突场景的适应性。仿真结果表明组合算法的间隔配置策略在中短距离以及较大航路夹角的情况下,能够保证两机间隔维持在最小安全间隔以上,并具有较好的间隔配置结果。

摘要：A theoretical calculation method of off-design performance is developed for an axial flow fan of oil cooling system in helicopter,including calculation of aerodynamic parameters and performance *** calculating inlet shock loss,the shock loss coefficient is obtained by comparing results of theoretical calculation,experimental and numerical *** theoretical results and numerical results show that all air velocity components increase from hub to shroud in main flow area at rated *** leakage vortex moves downstream as flow rate *** flow rate decreases,Re decreases,and boundary layer thickness from hub to shroud area all increases *** leakage vortex moves upstream,and secondary loss *** speed area in the passage is widened along with high speed area moving to hub area,influenced by boundary layer *** wake area and jet area at fan outlet are both larger than rated *** optimization design for off-design performance of the fan is required on aerodynamic parameters influencing fan loss.A reliable method is supplied for estimating altitude performance of lubricating system in helicopter.

摘要：Modularized circuit designs for chaotic systems are introduced in this ***,a typical improved modularized design strategy is proposed and applied to a new hyper-chaotic system circuit *** this paper,the detailed design procedures are *** simulations and physical experiments are conducted,and the simulation results are compared with Matlab simulation results for different system parameter *** results are consistent with each other and they verify the existence of the hyper-chaotic attractor for this new hyper-chaotic system.

摘要：经由在空中的位置和取向系统(POS ) 获得的数据在 WGS 84 全球以地球为中心的引用框架，当为在中国的地志的印射的国家并列引用系统通常是 Gauss-Kruger 设计坐标系统时。因此，经由 POS 获得的数据必须被转变到国家坐标系统。由于地球弯曲和顶点偏差的效果，在从转动，沥青，和标题的角度转变的过程有一些错误(桅，螛，经由 POS 直接获得到图象的态度角度的唯)( 蠁，蠅，在摄影测量学需要的魏) 。根据外面的取向上的地球弯曲和顶点偏差的效果理论图象的尖元素，使用一个赔偿矩阵从态度角度改正转变错误的一个方法经由 POS 获得了到外面的取向图象的尖元素在这份报纸被建议。而且，赔偿矩阵的严密公式被推出。经由 POS AV 510 获得的实际数据的二个集合，在规模和地面不同，被选择并且过去常执行实验。实验结果不仅显示赔偿矩阵在这建议纸正确、实际而且证明尖元素基于赔偿矩阵经由 POS 获得了的外面的取向的那转变精确性与 Gauss-Kruger 设计的垂直的轴(中央顶点的设计)的选择相关坐标系统；合适的垂直的轴应该是调查区域在定位的设计地区的中央顶点的 Gauss-Kruger 设计。然而，外面的取向的转变精确性尖元素与坐标系统的起源的选择无关；坐标系统的起源在调查区域的中心点定位，是适当的。而且，尖元素基于在这份报纸推出的赔偿矩阵完成了的外面的取向的转变精确性比经由处理软件的存在 POS 获得了的高。

摘要：An adaptive outlier controlling multirate model based on Hong’s multirate kinetic model was represented in order to resist the outliers and utilize their useful information. Wavelet transform was introduced to detect and control the outliers. The multirate information extraction and the controlling of outliers were properly integrated to establish an adaptive outlier controlling multirate model. The proposed model was applied to multisensor state fusion with interacting multiple model (IMM), and a robust interacting multisensor state fusion algorithm was established based on adaptive outlier controlling multirate model. The Monte-Carlo simulation shows that it could improve the accuracy of fusion estimation by 70% compared to Hong’s algorithm and at least 14% to Xiao’s algorithm.

摘要：A novel hybrid switching architecture using optical circuit switching for intra-subnet communication and fiber channel(FC)for inter-subnet communication is *** proposed scheme utilizes small-size arrayed waveguide grating routers(AWGRs)and legacy FC switches to construct the large-scale avionic network,thus has the potential of the lower latency,the satisfactory network bandwidth and the lower power *** simulation results verify that the proposed architecture outperforms FC switched architecture in terms of real time performance and power consumption.

摘要：The squirrel-cage elastic support is one of the most important components of an aero-engine rotor system.A proper structural design will favor the static and dynamic performances of the *** view of the deficiency of the current shape optimization techniques,a new mapping approach is proposed to define shape design variables based on the parametric equations of 3D curves and *** is then applied for the slot shape optimization of a squirrel-cage elastic *** this end,an automatic design procedure that integrates the Genetic Algorithm (GA) is developed to solve the *** typical examples with different shape constraints are *** results provide reasonable optimum designs for the improvement of stiffness and strength of the squirrel-cage elastic support.