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Modified Three-Loop Autopilot for Acceleration control Performance Improvement of a Canard-controlled Aircraft

Transactions of the Korean Institute of Electrical Engineers 2024年第7期73卷 1220-1231页

作者： Han, Kwang-Hee Han, Jieun Whang, Ick-Ho Ra, Won-Sang School of Mechanical and Control Engineering Handong Global University Korea Republic of Department of Mechanical and Control Engineering Handong Global University Korea Republic of

This paper proposes a new autopilot topology with its optimal design methodology for canard-controlled unmanned aerial vehicles(UAVs). While the traditional three-loop autopilot has been considered as a rule of thumb to control a tail-controlled UAV, it is questionable whether this topology also becomes one of the best choices for UAVs with other wing configurations. To identify a probable improvement of the existing approach, the topological property of the conventional three-loop autopilot is investigated. As a result, it is shown that the three-loop autopilot consists of a full-state feedback controller with an angle-of-attack estimator as well as an integral compensator in its feedforward path. Based on this observation, a modified three-loop autopilot is suggested by replacing the integral compensator with the proportional-integral one to improve the acceleration tracking performance. The control gains of our autopilot are designed by solving the optimal output feedback control problem. To cope with the lack of stability margin due to un-modeled actuator dynamics, the weighting matrix associated with the cost function of the problem is systematically chosen to guarantee the desired phase margin and the gain cross-over frequency. Simulation results confirm that the proposed method shows better performance for canard-controlled UAVs than the existing topology. Copyright © The Korean Institute of Electrical Engineers.

关键词： Topology

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F-doping effects on microstructure and electrochemical performance of cathode material Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)

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Particuology 2024年第12期95卷 82-91页

作者： Xiaoqian Sun Yunhui Du Weiyi Zhang Mengjiao Jin Ruiang Fan Peng Zhang School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing10004China School of Department of Mechanical Engineering Stanford UniversityStanfordCA94305United States

Lithium-rich manganese-based(Li-rich Mn-based)cathode materials possess high specific capacity,low self-discharge rate and steady working voltage,but cycle performance and rate performance need to be further *** this study,cathode materials Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2-x)F_(x)(x=0,0.02,0.05,0.08)are synthesized by the co-precipitation method with the two-step calcination *** the F-doping effects on the microstructure and the electrochemical performance are investigated in the cathode materials Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2).The results indicate that among all the F-doped cathode materials,the crystal lattice parameters are increased,order degree and stability of the layered structure are *** for x=0.05,cathode material Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(1.95)F_(0.05)(LMO-F_(0.05))shows the best cycle performance and rate performance with its capacity retention rate 87.7%after 100 cycles at 0.2 C and discharge capacity 117 mAh g−1 at 5 C high *** can be seen that F doping is a simple and crucial strategy to promote the Li ion diffusion and develop high performance layered cathode materials.

关键词： F-doped Li-rich Mn-Based cathode material Microstructure Cycling performance Rate performance

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Energy and Exergy Analysis of Pyramid-Type Solar Still Coupled with Magnetic and Electrical Effects by Using Matlab Simulation

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Frontiers in Heat and Mass Transfer 2024年第1期22卷 217-262页

作者： Karrar A.Hammoodi Hayder A.Dhahad Wissam H.Alawee Z.M.Omara Air Conditioning Engineering Department Faculty of EngineeringWarith Al-Anbiyaa UniversityBaghdadIraq Mechanical Engineering Department University of TechnologyBaghdadIraq Control and Systems Engineering Department University of TechnologyBaghdadIraq Mechanical Engineering Department Faculty of EngineeringKafrelsheikh UniversityKafrelsheikhEgypt

In the face of an escalating global water crisis,countries worldwide grapple with the crippling effects of scarcity,jeopardizing economic progress and hindering societal *** energy emerges as a beacon of hope,offering a sustainable and environmentally friendly solution to *** distillation technology,harnessing the power of the sun,transforms seawater into freshwater,expanding the availability of this precious *** solar still performance under specific climatic conditions and evaluating different configurations is crucial for practical implementation and widespread adoption of solar *** this study,we conducted theoretical investigations on three distinct solar still configurations to evaluate their performance under Baghdad’s climatic *** solar stills analyzed include the passive solar still,themodified solar still coupled with a magnetic field,and themodified solar still coupled with bothmagnetic and electrical *** results proved that the evaporation heat transfer coefficient peaked at 14:00,reaching 25.05 W/m^(2).℃for the convention pyramid solar still(CPSS),32.33 W/m^(2).℃for the magnetic pyramid solar still(MPSS),and 40.98 W/m^(2).℃for elecro-magnetic pyramid solar still(EMPSS),highlighting their efficiency in converting solar energy to ***,exergy efficiency remained notably lower,at 1.6%,5.31%,and 7.93%for the three still types,even as energy efficiency reached its maximum of 18.6%at 14:00 with a corresponding peak evaporative heat of 162.4 W/m^(2).

关键词： Pyramid solar still solar desalination energy and exergy analysis innovative solar still technique theoretical study Matlab

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Lubricant Transport Mechanism and Dynamics Model for Nepenthes-shaped Biomimetic Microtexture

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Chinese Journal of mechanical engineering 2025年第2期38卷 235-252页

作者： Xiaoming Wang Min Yang Teng Gao Lan Dong Yusuf Suleiman Dambatta Xin Liu Yuying Yang Qinglong An Yanbin Zhang Changhe Li Key Lab of Industrial Fluid Energy Conservation and Pollution Control Ministry of EducationQingdao University of Technology School of Mechanical and Electrical Engineering Qingdao Binhai University Mechanical Engineering Department Ahmadu Bello University School of Mechanical Engineering Dalian University of Technology School of Mechanical Engineering Qilu University of Technology (Shandong Academy of Sciences) School of Mechanical Engineering Shanghai Jiao Tong University Qingdao Jimo Qingli Intelligent Manufac turing Industry Research Institute

During the metal cutting process, especially in continuous contact conditions like turning, the challenge of lubricants failing to effectively reach the cutting point remains unresolved. Micro-textured cutting tools offer a potential solution for tool-chip contact challenges. Inspired by the evolutionary achievements of the biosphere, micro-textures are expected to overcome lubrication limitations in cutting zones. Drawing on the anti-gravity water transport seen at the mouth edge of the Nepenthes plant, an innovative microchannel with Nepenthes-shaped contours was designed on the rake face to enable controlled lubricant transport. However, the dynamics of lubricant delivery on textured surfaces are not fully understood. This study first analyzed the microstructure and water transport mechanism of Nepenthes to reconstruct a micro-textured surface for controlled lubricant transport. A dynamic model was then developed to describe lubricant transport within open microchannels, with mathematical simulations predicting transport speed and flow distance. To validate this model, diffusion experiments of alumina soybean oil nanolubricant on polycrystalline diamond(PCD) cutting tool surfaces were conducted, showing an average prediction deviation of 5.01%. Compared with the classical Lucas-Washburn model, the new model improved prediction accuracy by 4.72%. Additionally, comparisons were made to examine droplet spreading and non-uniform diffusion on textured surfaces, revealing that the T2 surface exhibited the strongest unidirectional diffusion characteristics. The contact angle ratio, droplet unidirectional spreading ratio, and droplet spreading aspect ratio were 0.48, 1.75, and 3.99, respectively. Finally, the anti-wear, friction-reducing, and efficiency-enhancing mechanisms of micro-textured surfaces in minimum quantity lubrication turning were analyzed. This approach may support continuous cutting of difficult-tomachine materials.

关键词： Biomimetic microtexture Capillary flow Nanolubricant Nepenthes

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Event-Based Dissipative Path Following control for Autonomous Ground Vehicles With External Disturbances and Actuator Faults

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年第9期9卷 1-10页

作者： Li, Wenfeng Wong, Pak Kin Xie, Zhengchao Gao, Jinwu Hu, Yunfeng Zhao, Jing School of Mechanical Engineering and Automation Northeastern University Shenyang China Department of Electromechanical Engineering University of Macau Macau China Department of Mechanical Engineering South China University of Technology Guangzhou China State Key Laboratory of Automotive Simulation and Control Department of Control Science and Engineering Jilin University Changchun China

In this paper, a novel event-based dissipative fuzzy control method is proposed for path following systems of autonomous ground vehicles subject to external disturbances and actuator faults. As the varying longitudinal velocity causes highly nonlinearities in the path following systems, a Takagi-Sugeno fuzzy vehicle dynamics model is established for controller design. Moreover, the time delay, multiple actuator faults and external disturbances are fully considered in the modeling of vehicle dynamic systems. For the improvement of path following performance, a dissipative performance index is employed in the controller design to strengthen the reliability of the control method. To achieve a better economization of the limited resource, an enhanced adaptive event-triggered mechanism is introduced into the controller design. Based on an augmented Lyapunov-Krasovskii functional candidate, a less conservative theorem is obtained by employing some extended integral inequalities. The theorem guarantees that the resulted fuzzy path following control system meets the strict dissipative performance on the premise of asymptotic stability. Finally, experimental results validate the superiority of the proposed method. IEEE

关键词： Linear matrix inequalities

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Performance Analysis of a Hexagon Rolling Mechanism with Single Degree of Freedom

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Journal of Mechanisms and Robotics 2025年第8期17卷 081001页

作者： Zhang, Qianqian Li, Yezhuo Yan, Shaoze Yao, Yan-An Department of Mechanical Engineering Tsinghua University Beijing100084 China School of Mechanical Electronic and Control Engineering Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control Technology Beijing Jiaotong University Beijing100044 China

This article presents a comprehensive performance analysis of the step-climbing and passive rolling modes of a hexagon rolling mechanism with single-degree-of-freedom, based on its structural characteristics and the constraints of centroid stability. First, a step-climbing model, incorporating motion parameters and support distance parameters, is established by leveraging the symmetrical posture movement characteristics of the hexagon rolling mechanism. Building on this foundation, the impact of each parameter on the mechanism's step-climbing ability is thoroughly analyzed, and the maximum height achievable during step climbing is also examined. Subsequently, the existence and sufficient conditions for the hexagon rolling mechanism to achieve passive rolling are analyzed using the centroid fluctuation curve and its slope curves. The analysis results indicate that, due to its unique coupling structure design, the hexagon rolling mechanism possesses a passive rolling capability that is not available in conventional planar linkage mechanisms. Finally, the correctness of the theoretical model is validated through both simulation and prototype experiments. Copyright © 2025 by ASME.

关键词： Degrees of freedom (mechanics)

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Sampled-data-based synchronization of complex networks under scaling attacks

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Mathematical Methods in the Applied Sciences 2024年第18期47卷 14487-14504页

作者： Murugesan, Sathishkumar Ishizaki, Takayuki Liu, Yen-Chen Department of Systems and Control Engineering Tokyo Institute of Technology Tokyo Japan Department of Mechanical Engineering National Cheng Kung University Tainan Taiwan

In this study, our main objective is to address the issue of sampled-data-based synchronization of complex networks subjected to stochastic scaling attacks using a looped-functional approach. To begin with, the design of a Lyapunov functional, which involves tuning parameters and slack variables, considers the error state information of (Formula presented.) and (Formula presented.). Then, the scaling attack is a type of deception attack that is formulated using an interval matrix approach. In addition, the complex networks considered in this study incorporate uncertain inner coupling strengths, which are more general than the existing ones, owing to the presence of uncertainties in the coupling strengths. Using a looped-functional approach to construct an appropriate Lyapunov–Krasovskii functional, we derive a set of sufficient conditions to achieve mean-square asymptotic synchronization for considered complex networks under scaling attacks. In the end, the proposed results are illustrated using three examples, including a practical example that highlights their effectiveness and superiority. © 2024 John Wiley & Sons Ltd.

关键词： Synchronization

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Comparison of the feedback linearization plus LQR controller and the PID controller for greenhouse indoor climate

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International Journal of Agricultural and Biological engineering 2025年第1期18卷 74-82页

作者： Kidist Ameha Mengesha Gang-Gyoo Jin Yung-Deug Son Department of Electrical Power and Control Engineering Adama Science and Technology UniversityAdama 888Ethiopia Department of Mechanical Facility Control Engineering Korea University of Technology and EducationChungnam 31253Republic of Korea

Greenhouse environmental control systems can improve the growth and quality of the plants within greenhouses by keeping a constant *** climate is a multi-input multi-output system that is significantly affected by climate factors like temperature,relative humidity,and carbon dioxide *** to the nonlinearity and existence of coupling among climate factors,the designed controller should provide good control *** study proposed both the feedback linearization plus linear quadratic regulator(LQR)controller and the proportional-integral-derivative(PID)controller for indoor air temperature and humidity control of a greenhouse *** nonlinear greenhouse model was transformed into its equivalent linear form using input-output feedback ***,a proportional-integral type LQR controller was designed for the linear form to achieve the overall nonlinear feedback control *** addition,the practical PID controller was designed and its gains were tuned using a genetic algorithm by considering the integral of absolute error and control deviation,and the integral of squared error and control deviation.A set of simulation works done on the nonlinear model illustrates the effectiveness of the two control *** control methods,feedback linearization plus LQR and PID,demonstrated effective performance in both setpoint tracking and disturbance *** feedback linearization plus LQR controller exhibited superior disturbance rejection capabilities,characterized by reduced perturbation peaks and faster recovery ***,the PID controller demonstrated superior setpoint tracking performance with minimal overshoot.

关键词： greenhouse climate control feedback linearization plus LQR control PID control genetic algorithm

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Influencing factor analysis of interception probability and classification-regression neural network based estimation

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Journal of Systems engineering and Electronics 2023年第4期34卷 992-1006页

作者： NAN Yi YI Guoxing HU Lei WANG Changhong TU Zhenbiao Department of Control Science and Engineering Harbin Institute of TechnologyHarbin 150001China Beijing Electro-mechanical Engineering Institute Beijing 100074China

The interception probability of a single missile is the basis for combat plan design and weapon performance evaluation,while its influencing factors are complex and mutually *** calculation methods have very limited analysis of the influence mechanism of influencing factors,and none of them has analyzed the influence of the guidance *** paper considers the influencing factors of both the interceptor and the target more *** parameters include speed,guidance law,guidance error,fuze error,and fragment killing ability,while target performance includes speed,maneuverability,and *** this paper,an interception model is established,Monte Carlo simulation is carried out,and the influence mechanism of each factor is analyzed based on the model and simulation ***,this paper proposes a classification-regression neural network to quickly estimate the interception probability based on the value of influencing *** proposed method reduces the interference of invalid interception data to valid data,so its prediction accuracy is significantly better than that of pure regression neural networks.

关键词： interception probability simulation modeling analysis of influencing factors probability estimation neural networks

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A review of motion planning for redundant space manipulators

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Science China(Technological Sciences) 2025年第3期68卷 30-53页

作者： Ziqiang ZHANG Xiaoshuo LIU Meng NING Xiaohui LI Weihui LIU Ye LU College of Mechanical and Energy Engineering Beijing University of TechnologyBeijing100124China School of Mechanical Engineering Jiangnan UniversityWuxi214122China Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control EngineeringBeijing100094China Department of Civil Engineering Monash UniversityMelbourne3800Australia

Redundant space manipulators(RSM)exhibit high flexibility and can assist astronauts in completing various onorbit service(OOS)tasks,which have been applied to the International Space Station(ISS)and China Space Station(CSS).Motion planning stands as a fundamental technology within RSM,guiding the manipulator to reach designated positions smoothly and execute operational tasks with optimal ***,the intricate nature of the space environment presents challenges to the motion planning of *** this paper,in response to issues such as maintenance difficulties after RSM failures,base floating caused by weightlessness,flexible deformation of structures due to large-scale operations,and multiple obstacles with uncertainty,fault-tolerant motion planning,motion planning considering base floating,motion planning under structural flexibility deformation,and obstacle avoidance motion planning are *** present,the increasingly complex OOS tasks have brought new challenges to the motion planning of *** challenges encompass motion planning for new mechanism configurations,dynamic motion planning,multi-RSM and multi-task planning,the improvement of motion planning efficiency,and the efficient implementation and precise process monitoring of *** the advancement of motion planning technology,RSM is poised to play an increasingly significant role in ISS and CSS.

关键词： redundant space manipulator on-orbit service motion planning main challenges

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