检索结果-南通市图书馆

制导控制系统半实物仿真总体方案设计及集成联试

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

系统仿真学报 2024年第1期36卷 83-96页

作者：常晓飞焦佳玥陈康符文星闫杰西北工业大学无人系统技术研究院陕西西安710072

半实物仿真作为一个大型分布式仿真系统,其总体方案的设计优劣和集成联试的是否顺利,直接影响了系统性能指标的表现和建设目标的实现。归纳总结了总体方案设计的工作内容,分析了实时性、兼容性、扩展性和安全性的性能要求;给出了包括功... 详细信息

半实物仿真作为一个大型分布式仿真系统,其总体方案的设计优劣和集成联试的是否顺利,直接影响了系统性能指标的表现和建设目标的实现。归纳总结了总体方案设计的工作内容,分析了实时性、兼容性、扩展性和安全性的性能要求;给出了包括功能层次、运行机制和结构组成在内的典型半实物仿真系统总体方案;概括了仿真系统的集成联试内容,总结了典型系统的集成联试步骤,给出了系统验收测试的内容和系统可信度评估方法。

关键词：半实物仿真总体方案集成联试运行机制

Lightweight hybrid visual-inertial odometry with closed-form zero velocity update

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2020年第12期33卷 3344-3359页

作者： QIU Xiaochen ZHANG Hai fu wenxing School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Science and Technology on Aircraft Control Laboratory Beijing 100191China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing 100074China

Visual-Inertial Odometry(VIO) fuses measurements from camera and Inertial Measurement Unit(IMU) to achieve accumulative performance that is better than using individual *** VIO is an extended Kalman filter-based solution which augments features with long tracking length into the state vector of Multi-State Constraint Kalman Filter(MSCKF). In this paper, a novel hybrid VIO is proposed, which focuses on utilizing low-cost sensors while also considering both the computational efficiency and positioning precision. The proposed algorithm introduces several novel contributions. Firstly, by deducing an analytical error transition equation, onedimensional inverse depth parametrization is utilized to parametrize the augmented feature *** modification is shown to significantly improve the computational efficiency and numerical robustness, as a result achieving higher precision. Secondly, for better handling of the static scene,a novel closed-form Zero velocity UPda Te(ZUPT) method is proposed. ZUPT is modeled as a measurement update for the filter rather than forbidding propagation roughly, which has the advantage of correcting the overall state through correlation in the filter covariance matrix. furthermore, online spatial and temporal calibration is also incorporated. Experiments are conducted on both public dataset and real data. The results demonstrate the effectiveness of the proposed solution by showing that its performance is better than the baseline and the state-of-the-art algorithms in terms of both efficiency and precision. A related software is open-sourced to benefit the community.

关键词： Inverse depth parametrization Kalman filter Online calibration Visual-inertial odometry Zero velocity update

Smart homing guidance strategy with control saturation against a cooperative target-defender team

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2019年第2期30卷 366-383页

作者： GUO Hang fu wenxing fu Bin CHEN Kang YAN Jie School of Astronautics Northwestern Polytechnical University

A smart homing guidance strategy with control saturation against a target-defender team is derived. It is noteworthy that a cooperative strategy of the target-defender team is applied,which has been proved more challenging for the homing *** defender missile is launched by the target and guided by a cooperative augmented proportional navigation(APN). At the same time, the target performs a one-switch maneuver to cooperate and minimize the defender's acceleration requirement. The problem is analyzed for arbitrary-order linear dynamics of the agents in the linearized form but validated by the mathematical simulations by using nonlinear kinematics. The perfect information of three agents' states is assumed. Then, a method to deal with the target-defender team is proposed. It contains a combined performance index penalizing the miss distance relative to the target and energy consumption in the whole duration. Besides, the specific miss distance related to the defender is regarded as an inequality constraint. An analytical solution for the smart guidance strategy against the APN guided defender is derived. Meanwhile, the control saturations are introduced to get more realistic and reasonable insights to this practical target-missile-defender problem. A simple but effective iterative searching technique is proposed to determine the saturation time points. The solution provides an optimal homing strategy to evade the defender with a specific miss distance and intercept the target with the minimum miss distance in the minimum energy manner. Nonlinear two-dimensional simulation results are used to validate the theoretical analysis. By comparison with the optimal differential game guidance(ODGG) and the combined minimum effort guidance(CMEG), the superiority of this smart guidance strategy is concluded.

关键词： smart homing guidance control saturation targetmissile-defender iterative searching technique

Impact angle constrained fuzzy adaptive fault tolerant IGC method for Ski-to-Turn missiles with unsteady aerodynamics and multiple disturbances

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2022年第5期33卷 1210-1226页

作者： GUO Hang WANG Zheng fu Bin CHEN Kang fu wenxing YAN Jie Research Center for Unmanned System Strategy Development Northwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China

An impact angle constrained fuzzy adaptive fault tolerant integrated guidance and control method for Ski-to-Turn(STT)missiles subject to unsteady aerodynamics and multiple disturbances is *** aerodynamics appears when flight vehicles are in a transonic state or confronted with unstable ***,actuator failures and multisource model uncertainties are ***,the boundaries of these multisource uncertainties are assumed *** target is assumed to execute high maneuver movement which is unknown to the ***,impact angle constraint puts forward higher requirements for the interception accuracy of the integrated guidance and control(IGC)*** impact angle constraint and the precise interception are established as the object of the IGC ***,the boundaries of the lumped disturbances are estimated,and several fuzzy logic systems are introduced to compensate the unknown nonlinearities and ***,a series of adaptive laws are developed so that the undesirable effects arising from unsteady aerodynamics,actuator failures and unknown uncertainties could be ***,an impact angle constrained fuzzy adaptive fault tolerant IGC method with three loops is constructed and a perfect hit-to-kill interception with specified impact angle can be ***,the numerical simulations are conducted to verify the effectiveness and superiority of the proposed method.

关键词： integrated guidance and control(IGC) impact angle constraint unsteady aerodynamics fault tolerant control(FTC) actuator failures

Aero-thermal heating constrained midcourse guidance using state-constrained model predictive static programming method

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2018年第6期29卷 1263-1270页

作者： fu Bin GUO Hang CHEN Kang fu wenxing WU Xingyu YAN Jie School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China Xi’an Microelectronic Technology Institute Xi’an 710065China

This paper proposes a multiple-constraints-guaranteed midcourse guidance law for the interception of the hypersonic targets. In traditional midcourse law design, the constraints of the aero-thermal heating are rarely taken into consideration. The performance of the infrared detection system may be degraded and the instability of the flight control system may be *** address this problem, a state-constrained model predictive static programming method is introduced such that both terminal constraints(position and angle) and optimal energy consumption can be ensured. As a result, a sub-optimal midcourse guidance,guaranteeing the aforementioned multiple-constraints to be never violated, is synthesized. Simulation results demonstrate the effectiveness of the proposed method.

关键词： midcourse guidance model predictive control optimal control state constraint

Optimal two-iteration sculling compensation mathematical framework for SINS velocity updating

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2014年第6期25卷 1065-1071页

作者： Tong Zhang Kang Chen wenxing fu Yunfeng Yu Jie Yan School of Astronautics Northwestern Polytechnical University

A new two-iteration sculling compensation mathematical framework is provided for modern-day strapdown inertial navigation system（SINS） algorithm design that utilizes a new concept in velocity updating. The principal structure of this framework includes twice sculling compensation procedure using incremental outputs from the inertial system sensors during the velocity updating interval. Then, the moderate algorithm is designed to update the velocity parameter. The analysis is conducted in the condition of sculling motion which indicates that the new mathematical framework error which is smaller than the conventional ones by at least two orders is far superior. Therefore, a summary is given for SINS software which can be designed with the new mathematical framework in velocity updating.

关键词： strapdown inertial navigation system(SINS) two-iteration velocity updating sculling optimized coefficients

Antioxidant high-conductivity copper paste for low-cost flexible printed electronics

在线全文

学校读者我要写书评

暂无评论

npj Flexible Electronics 2022年第1期6卷 176-184页

作者： Shuqing Hong Chimin Liu Shuqiang Hao wenxing fu Jian Peng Binghui Wu Nanfeng Zheng Pen-Tung Sah Institute of Micro-Nano Science and Technology State Key Laboratory for Physical Chemistry of Solid SurfacesCollaborative Innovation Center of Chemistry for Energy MaterialsNational&Local Joint Engineering Research Center of Preparation Technology of NanomaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of fujian Province(IKKEM) Xiamen 361005China

The flexible printed electronics(e.g.,wearable devices,roll-up displays,heating circuits,radio frequency identification(RFID)tags)calls for high-conductivity and low-cost materials,particularly for copper *** is still a big challenge to develop reliable copper pastes for both antioxidant and high-conductivity flexible printed films and *** this work,an antioxidant copper paste was achieved using copper microflakes with surface passivation by formate ions and thiols,with high conductivity of 13400 S cm^(−1)(the same order of magnitude of silver pastes,1.8-2.5×10^(4) S cm^(−1)).The universal applications of as-prepared copper paste in flexible printed electronics(e.g.,electromagnetic interference(EMI)shielding films,anti-fog films,and RFID tags)via screen printing and curing at 170℃ under ambient atmosphere were *** as-printed electronics showed high performance in flexibility,stability,and *** work shows the great potential of anti-oxidation copper pastes in low-cost flexible printed electronics for commercial usage.

关键词： paste copper cost

Liquefaction of Banana Pseudo-stem and Preparation of Polyurethane Adhesive from Liquefied Products

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2018年第6期33卷 1437-1443页

作者： ZHOU Wei ZHANG Yueang College of Materials and Chemical Engineering Hainan University

Banana pseudo-stem was liquefied in the mixture of polyhydric alcohols of polyethylene glycol(PEG400) and glycerol. Hydroxyl value of liquefied products ranged from 294.8 to 370.2 mg KOH/g and M_n was about 430. Liquefied products(LBPP) could be used as raw materials for polyurethane by reacting with 4, 4'-diphenylmethane diisocyanate(4, 4'-MDI) and PEG400 to synthesize liquefied product-based polyurethane(LBPP-PU) adhesive. To analyze in depth the creation of urethane linkage among LBPP, PEG400 and 4, 4'-MDI, factors which had effects on the residue content were all investigated. They were characterized by FT-IR and TG. The shear strength of LBPP-PU adhesive was improved when decreasing the percentage of the substitution of PEG400 by LBPP. The adhesive strength was obtained from T-peel of aspen/polyurethane adhesive joints, and the maximum lap shear strength(4.40 MPa) was obtained when 16.70% of LBPP was added to the LBPP & PEG400 system.

关键词： liquefaction banana pseudo-stem polyhydric alcohols polyurethane adhesive

基于红外传感器的多无人机对高速飞行器协同定位跟踪方法综述

在线全文

学校读者我要写书评

暂无评论

无人系统技术 2024年第1期7卷 20-35页

作者：王晨昕符文星张通朱苏朋杨光宇西北工业大学无人系统技术研究院西安710072 西北工业大学航天学院西安710072

为了实现高精度远距离稳定定位与跟踪,多无人机搭载红外传感器对高速飞行器的定位跟踪方法成为研究热点。就此背景进行了综合评述,以相关技术难点及关键技术为切入点,分析了瞬时定位和动态跟踪问题的研究现状和发展方向。在瞬时协同定... 详细信息

为了实现高精度远距离稳定定位与跟踪,多无人机搭载红外传感器对高速飞行器的定位跟踪方法成为研究热点。就此背景进行了综合评述,以相关技术难点及关键技术为切入点,分析了瞬时定位和动态跟踪问题的研究现状和发展方向。在瞬时协同定位方面,首先对目标瞬时定位的算法进行了分析对比,然后对造成定位误差的影响因素进行分析并探讨了误差补偿方法,最后针对传感器资源优化,讨论了能够使计算结果最优的传感器分布阵型。在动态跟踪方面,首先探讨了时间不同步问题对目标跟踪的影响及补偿方法,然后对目标运动学建模的问题进行了分析,最后对最优估计问题中各种滤波算法的应用进行对比。综述表明,无人机搭载红外传感器对高速飞行器进行定位和跟踪,存在误差来源多、相对运动速度快的技术难点,需要特别关注定位算法、误差来源及最优估计算法的影响,以尽可能实现稳定跟踪。

关键词：高速飞行器无人机定位跟踪红外传感器确定性误差补偿随机误差校正时间配准运动学模型最优估计