检索结果-南通市图书馆

Hybrid Model Predictive Control and Fault Detection of Wind Energy Conversion System Based on Mixed Logical Dynamic

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hybrid Model Predictive Control and Fault Detection of Wind ...

Trajectory Tracking of Quadrotor Aerial Robot Using Improved Dynamic Inversion Method

第26届中国控制与决策会议

作者： Shi Yun-tao Qiao Shu-juan Hou Yan-jiao Li Zhi-jun Sun De-hui key lab of field bus and automation of beijing North China University of Technology

The main contribution of this paper is the development of hybrid model predictive control and fault detection strategy for wind energy conversion system（WECS） based on mixed logic dynamic（MLD） model framework. The MLD model for WECS including multiple work regions is established. Also the hybrid model predictive control method based on the MLD model of WECS is adopted to implement the variable speed constant frequency control and variable pitch control for the optimal power tracking. The mixed logic dynamic fault（MLDF） model is also established for generator speed sensor fault and the pitch actuator fault of WECS. Moving horizon estimation（MHE） method is applied to estimate the fault states of WECS based on MLDF model of WECS. The performance and the efficiency of the proposed approaches validated via simulations.

关键词： Wind Energy Convert System Hybrid Model Predictive Control Moving Horizon Estimation Fault Detection.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Intelligent Control and automation 2013年第4期4卷 343-348页

作者： Lifeng Wang Yichong He Zhixiang Zhang Congkui He field bus Technology & automation lab North China University of Technology Beijing China

This paper presents trajectory tracking control works concerning quadrotor aerial robot with rigid cross structure. The quadrotor consists of four propellers which are two paired clockwise rotate and anticlockwise rotate. A nonlinear dynamic model of the quadrotor is provided, and a controller based on the improved dynamic inverse is synthesized for the purpose of stabilization and trajectory tracking. The proposed control strategy has been tested in simulation that can balance the deviation of model inaccuracy well.

关键词： Aerial Robot Quadrotor Nonlinear Model Dynamic Inversion Robust Control

Design of multi-section luffing apple pruning equipment and cutting test of the key components

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2024年第1期17卷 109-117页

作者： Siyuan Tong Wenbin Li Yaxiong Wang Lei Zhang Feng Kang School of Technology Beijing Forestry UniversityKey Lab of State Forestry and Grassland Administration for Forestry Equipment and AutomationBeijing 100083China

In order to reduce the labor intensity and improve the efficiency of pruning,this study designed a multi-section luffing apple pruning equipment suitable for apple orchards in hilly and mountainous areas of *** the essay,the structure and working principle of the equipment are expounded,the cutter was analyzed,and the parameters were *** the self-made test bench to simulate the field experiment,this study selected the ratio of cutting speed to feeding speed and feeding speed as the influencing factors and took the cut-off rate,cutting efficiency and cutting power as the objectives to carry out single factor experiment and quadratic regression orthogonal *** test results show that the cutting power increases with the increase of ratio of cutting speed to feeding speed,and the cut-off rate and cutting efficiency first increase and then *** the feeding speed increases,the cutting efficiency and power increase,and the cut-off rate *** the cutoff rate was greater than 80%,the optimal combination of operating parameters was the feeding speed of 0.55 m/s and ratio of cutting speed to feeding speed of *** this combination,the cut-off rate was 84.9%,the cutting efficiency was 13.1,and the cutting power was 175.7 *** error between the predicted target value of the model and the average measured target value was less than 7%,so the test results are *** to the obtained optimal operating parameters,the actual cutting experiment of the pruning equipment in the field was carried out,and the cutting rate was 96.3%,which meet the design *** study can also meet the needs of mechanized pruning of fruit trees with different crown shapes,improve the applicability of pruning equipment,and provide support for the development of mechanized pruning equipment in China.

关键词： apple pruning equipment cutting test optimal parameters regression analysis

Data-model coupling driven stress field measurements

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2024年第4期14卷 280-290页

作者： Guangbo Wang Jian Zhao Jiahui Liu Dong Zhao School of Technology Beijing Forestry UniversityBeijing 100083China key lab of State Forestry Administration on Forestry Equipment and automation Beijing Forestry UniversityBeijing 100083China State key laboratory of Efficient Production of Forest Resources Beijing 100083China

This paper presents a method for measuring stress fields within the framework of coupled data models,aimed at determining stress fields in isotropic material structures exhibiting localized deterioration behavior without relying on constitutive equations in the deteriorated *** approach contributes to advancing the field of intrinsic equation-free *** methodology combines measured strain fields with data-model coupling driven *** gradient and Canny operators are utilized to process the strain field data,enabling the determination of the deterioration region's ***,an adaptive model building method is proposed for constructing coupling driven *** address the issue of unknown datasets during computation,a dataset updating strategy based on a differential evolutionary algorithm is *** resulting optimal dataset is then used to generate stress field *** against finite element method calculations demonstrates the accuracy of the proposed method in obtaining full-field stresses in specimens with local degradation behavior.

关键词： Stress field measurements Data-model coupling driven Differential evolutionary algorithm Material dataset

Model-Plant Performance Matching from the Limited Number of Measured Quantities for Gas Power Generator

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Model-Plant Performance Matching from the Limited Number of ...

key technologies of light field capture for 3D reconstruction in microscopic scene

2012年计算机应用与系统建模国际会议

作者： Wang Lifeng Zhong Datian field bus Technology & automation lab North China University of Technology beijing Aerospace Propulsion Institute

The matching technique of model-plant performance data can be used to solve several problems, such as fault diagnosis, the model calibration and deterioration estimation etc. In present paper, model-plant performance matching from the limited number of measured quantities is proposed. A gas power generator is modeling in simulating environments to constitute a benchmark case. Assumed the health factors are constant at adjacent zone of operating points, several discrete points are selected to compensate the number of measured quantities. Depending on the interrelated equations between measured residuals and health factors, the nonlinear Least Square is used to optimize the object value of components health factors. Several sets of simulated deterioration and fault data are naturalized as the testing case, the better matching of model-plant is obtained from the simulating results.

关键词： Engine model deterioration estimation fault diagnosis model-plant matching

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2010年第10期53卷 1917-1930页

作者： WANG Yu, JI XiangYang & DAI QiongHai Broadband Networks & Digital Media lab of automation Department, Tsinghua University, beijing 100084, China Broadband Networks & Digital Media lab of automation Department Tsinghua University Beijing China

Light field capture for 3D reconstruction in microscopic scene is a very promising and useful technology, which can be extensively applied to life sciences, medicine, materials science, etc. This paper summarizes the key technologies in the evolution of microscopes for capturing 3D information, including wavefrontreconstruction, holography, fluorescence, tomography and so on. To give in-depth insights into them, detailed analyses and comparisons are provided. Finally, some future potential work in terms of light field capture and its application are discussed at length.

关键词： light field 3D reconstruction microscopy

Synchrophasor-based Online State Estimated in Large-scale Power Grid

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2023年第5期9卷 1613-1622页

作者： Junjie Lin Chao Lu Wenchao Song Yingduo Han Yinsheng Su He Huang Licheng Li the College of Electrical Engineering and automation Fuzhou UniversityFuzhouChina the Department of Electrical Engineering Tsinghua UniversityBeijingChina the State key lab of Power systems Department of Electrical EngineeringTsinghua UniversityBeijingChina China Southern Power Grid GuangzhouChina

With integration of a larger amount of clean power sources and power electronic equipment,operation and dynamic characteristics of the power grid are becoming more and more complicated and ***,it is necessary and urgent to obtain accurate real-time states,which is difficult from traditional state *** paper systematically develops a phasor measurement unit(PMU)based real-time state estimator for a realistic large-scale power grid for the first *** estimator mainly relies on three refined algorithms,i.e.,an improved linear state estimation algorithm,a practical bad data identification method and a distributed topology check ***,a novel system architecture is designed and implemented for the China Southern Power *** simulations and extensive field operation results of the state estimator recorded under both normal and abnormal situations are *** the tests and field results demonstrate the advantages of the proposed algorithms in terms of online system monitoring and feasibility of refreshing the states of the whole system at intervals of tens of milliseconds.

关键词： PMU-based state estimation design and implementation bad data identification topology analysis

Active electronic skin:an interface towards ambient haptic feedback on physical surfaces

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Flexible Electronics 2024年第1期8卷 684-710页

作者： Yuan Guo Yun Wang Qianqian Tong Boxue Shan Liwen He Yuru Zhang Dangxiao Wang State key lab of Virtual Reality Technology and Systems BeijingChina School of Mechanical Engineering and automation Beihang UniversityBeijingChina Department of Strategic and Advanced Interdisciplinary Research Peng Cheng LaboratoryShenzhenChina

In the era of ubiquitous computing with flourished visual displays in our surroundings,the application of haptic feedback technology still remains in its *** the gap between haptic technology and the real world to enableambient haptic feedback on various physical surfaces is a grand challenge in the field of human-computer *** paper presents the concept of an active electronic skin,characterized by three features:richness(multi-modal haptic stimuli),interactivity(bi-directional sensing and actuation capabilities),and invisibility(transparent,ultra-thin,flexible,and stretchable).By deploying this skin on physical surfaces,dynamic and versatile multi-modal haptic display,as well as tactile sensing,can be *** potential applications of this skin include two categories:skin for the physical world(such as intelligent home,intelligent car,and intelligent museum),and skin for the digital world(such as haptic screen,wearable device,and bare-hand device).Furthermore,existing skin-based haptic display technologies including texture,thermal,and vibrotactile feedback are surveyed,as well as multidimensional tactile sensing *** analyzing the gaps between current technologies and the goal of ambient haptics,future research topics are proposed,encompassing fundamental theoretical research on the physiological and psychological perception mechanisms of human skin,spatial-temporal registration among multimodal haptic stimuli,integration between sensing and actuation,and spatial-temporal registration between visual and haptic *** concept of active electronic skin is promising for advancing the field of ambient haptics,enabling seamless integration of touch into our digital and physical surroundings.

关键词： Active ambient electronic

Convolution Neural Network-based Load Model Parameter Selection Considering Short-term Voltage Stability

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第3期10卷 1064-1074页

作者： Ying Wang Chao Lu Xinran Zhang School of Technology Beijing Forestry UniversityBeijing 100083China State key laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua UniversityBeijing 100084China School of automation Science and Electrical Engineering Beihang UniversityBeijing 100083China IEEE

The recently proposed ambient signal-based load modeling approach offers an important and effective idea to study the time-varying and distributed characteristics of power ***,it also brings new *** the load model parameters of power loads can be obtained in real-time for each load bus,the numerous identified parameters make parameter application *** order to obtain the parameters suitable for off-line applications,load model parameter selection(LMPS)is first introduced in this ***,the convolution neural network(CNN)is adopted to achieve the selection purpose from the perspective of short-term voltage *** begin with,the field phasor measurement unit(PMU)data from China Southern Power Grid are obtained for load model parameter identification,and the identification results of different substations during different times indicate the necessity of ***,the simulation case of Guangdong Power Grid shows the process of LMPS,and the results from the CNNbased LMPS confirm its effectiveness.

关键词： Ambient signal CNN field PMU data load model parameter selection short-term voltage stability