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IEEE Conference on Decision and control

作者： B. Lennartson R. Middleton A.-K. Christiansson T. McKelvey Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden Complex Dynamic Systems & Control School of Electrical Engineering & Computer Science University of Newcastle Callaghan NSW Australia University of Trollhättan/Uddevalla Trollhattan Sweden Department of Signals and Systems Chalmers University of Technology Goteborg Sweden

A procedure for H/sub /spl infin// optimization of low order controllers for discrete-time and sampled-data systems is presented in this paper. Generally, low order H/sub /spl infin// controllers may be achieved by solving bilinear matrix inequalities (BMIs). In this paper an iterative alternation between two LMIs gives a suboptimal solution. To avoid local minima in this search the initial controller is obtained by a frequency weighted controller reduction scheme, where the closed loop properties of a full order controller is taken into account. A minimal number of parameters in the state space realization of the controller also reduces the complexity and improves numerical robustness. The complete presentation is based on delta operator models, which shows a close relationship between the continuous- and discrete-time solutions. The sensitivity of the ordinary discrete-time shift operator LMI formulation to small sampling periods is also analyzed.

关键词： control systems Linear matrix inequalities Sampling methods Automatic control Frequency Weight control Robust control Signal processing State-space methods Robustness

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A Reinforcement Learning-Based Energy Management Strategy for Fuel Cell Electric Vehicle Considering Coupled-Energy Sources Degradations

SSRN

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SSRN 2022年

作者： Huo, Weiwei Liu, Teng Li, Fajia Institute of Electromechanical Engineering Beijing Information Science & Technology University Beijing100192 China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing Information Science & Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China University of Jinan Jinan250024 China

The energy management strategy (EMS) is crucial for fuel cell electric vehicles (FCEV) by decreasing the equivalent fuel consumption and postponing fuel cell deterioration. An improved EMS based on the Twin Delayed Deep Deterministic Policy Gradient (TD3) deep reinforcement learning considering energy sources degradation and economic factor is proposed in this paper. The working condition identification (WCI) implemented by ensemble bagged trees (EBT) is used to expand the diversity of EMS application scenarios . The drastic loading change of fuel cell is avoided for minimizing the instantaneous cost (MIC), which reduces fuel cell degradation greatly. TD3 is applied to optimize the total cost combined with WCI and MIC. The training results based on 13 classic working conditions show that the degradation of the fuel cell system is effectively suppressed, decreasing the overall cost and accelerating the algorithm's convergence time significantly. © 2022, The Authors. All rights reserved.

关键词： Energy management

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Investigation into Influence Factors of synchronous movement of Multi-cylinders

Investigation into Influence Factors of synchronous movement...

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2016 IEEE/CSAA International Conference on Aircraft Utility Systems(AUS)

作者： Chao Hu Pengfei Zhang Xiaoping Ouyang Houtao Ku Qinghe Zhou Enxiao Zhang State Key Lab.of Fluid Power Transmission and Control Zhejiang University Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration State Key Lab.of Fluid Power Transmission and Control Zhejiang Univ. The High School Attached to Zhejiang University

Seal is one of the most important characteristics for cylinders and suitable seal configuration will guarantee the long life cycle of the seal and the *** is the only way which can demonstrate the best seal configuration in *** this paper,one approach is brought forward for testing the seal performance of cylinders with different seals configurations at the same load working condition for saving the test *** the test-rig,the synchronization of cylinders is one of the key *** test system is modelled in the AMESim *** effect caused by the changes of the different physical parameters is analyzed,such as load stiffness,viscous damping coefficient of cylinder,dead volume of cylinder and internal leakage *** experiment is carried out and test results agree with the simulation ***,the appropriate solution is proposed for improving the synchronization of the multi-cylinders further.

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Investigation into influence factors of synchronous movement of multi-cylinders

Investigation into influence factors of synchronous movement...

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IEEE International Conference on Aircraft Utility Systems (AUS)

作者： Chao Hu Pengfei Zhang Xiaoping Ouyang Houtao Ku Qinghe Zhou Enxiao Zhang State Key Lab. of Fluid Power Transmission and Control Zhejiang University Hangzhou China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China The High School Attached to Zhejiang University Hangzhou China

ISBN: (纸本)9781509010882

Seal is one of the most important characteristics for cylinders and suitable seal configuration will guarantee the long life cycle of the seal and the cylinder. Experiment is the only way which can demonstrate the best seal configuration in applications. In this paper, one approach is brought forward for testing the seal performance of cylinders with different seals configurations at the same load working condition for saving the test time. In the test-rig, the synchronization of cylinders is one of the key technologies. The test system is modelled in the AMESim software. The effect caused by the changes of the different physical parameters is analyzed, such as load stiffness, viscous damping coefficient of cylinder, dead volume of cylinder and internal leakage coefficient. The experiment is carried out and test results agree with the simulation results. Finally, the appropriate solution is proposed for improving the synchronization of the multi-cylinders further.

关键词： Synchronization Valves Seals Damping Load modeling Springs Servomotors

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Reliability-aware control of Power Converters in Mobility Applications

Reliability-aware Control of Power Converters in Mobility Ap...

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European control Conference (ECC)

作者： Amin Rezaeizadeh Gioele Zardini Emilio Frazzoli Silvia Mastellone Institute of Electric Power Systems University of Applied Science Northwest Switzerland Windish Switzerland Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA USA Institute for Dynamic Systems and Control ETH Zürich Switzerland

ISBN: (数字)9783907144107

ISBN: (纸本)9798331540920

The large scale adoption of Battery Electric Vehicles (BEVs) is still limited by cost, reliability and lifetime considerations. The power converters of a BEVs, and more specifically the semiconductor switching devices, are the second most likely component to fail due to the damage caused by the current-induced temperature cycling. In this paper we address the active mitigation of damage in e-mobility power converters, by introducing a novel frequency-domain speed controller for the power train that reduces the thermal stress on the power electronic Insulate Gate Bipolar Transistors (IGBTs), while simultaneously ensuring effective speed tracking performance. We integrate the multi-objective problem in an $\mathcal{H}_{\infty}$ control framework, which embeds the semiconductor reliability model in the weights functions. The method is tested using standardised driving cycles in two different scenarios: reliability-aware, and performance-oriented cases. Finally a lifetime analysis of the IGBTs, in both scenarios is performed leveraging the Rainflow algorithm and temperature data.

关键词： Insulated gate bipolar transistors Degradation Temperature distribution Switches Insulation life Temperature control Reliability

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Research on the Cushioning Effect of Protective Materials under High Impact

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Journal of Physics: Conference Series 2020年第1期1635卷

作者： Runfeng Chen Li Sui Qiang Liu Qiangqiang Qiu Science and Technology on Electromechanical Dynamic Control Laboratory Beijing Institute of Technology Beijing China Northwest Industries Group Co. Ltd. Xi'an China

Aiming at the protection of the internal components of the projectile during penetration, the cushion performance of common protective materials such as polyurethane, felt, polytetrafluoroethylene (PTFE), and copper were tested. The test results show that the copper and felt have a certain cushioning effect, which can reduce the acceleration amplitude of 23,000 g by 18% and extend the pulse width of acceleration overload. The cushioning effect of PTFE material is not obvious, but it can play a role in mechanical filtering, making the acceleration curve smoother. Polyurethane material will increase the acceleration amplitude of the buffered part, it is not suitable as a buffer material.

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Temperature and electric-field induced phase transitions, and full tensor properties of C-poled domain-engineered tetragonal 0.63Pb(Mg1/3Nb2/3)−0.37PbTiO3 single crystals

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Physical Review B 2016年第9期93卷 094104-094104页

作者： Limei Zheng Yujia Jing Xiaoyan Lu Ruixue Wang Gang Liu Weiming Lü Rui Zhang Wenwu Cao Condensed Matter Science and Technology Institute Harbin Institute of Technology Harbin 150080 China Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin 150001 China Center for High Pressure Science and Technology Advanced Research Shanghai 201203 China Department of Mathematics Materials Research Institute The Pennsylvania State University University Park Pennsylvania 16802 USA

The phase-transition sequence of 0.67Pb(Mg1/3Nb2/3)−0.37PbTiO3 (PMN-0.37PT) single crystals driven by the electric (E) field and temperature is comprehensively studied. Based on the strain-E field loop, polarization-E field loop, and the evolution of domain configurations, the E field along the [011]C induced phase transitions have been confirmed to be as follows: tetragonal (T) → monoclinic (MC)→ single domain orthorhombic (O) phase. As the E field decreases, the induced O phase cannot be maintained and transformed to the MC phase, then to the coexistence state of MC and T phases. In addition, the complete sets of dielectric, piezoelectric, and elastic constants for the [011]C-poled domain-engineered PMN-0.37PT single crystal were measured at room temperature, which show high longitudinal dielectric, piezoelectric, and electromechanical properties (ɛ33T=10661,d33=1052pC/N, and k33=0.766). Our results revealed that the MC phase plays an important role in the high electromechanical properties of this domain-engineered single crystal. The temperature dependence of the domain configuration revealed that the volume fraction of the MC phase decreases with temperature accompanied by the reduction of ɛ33T,d31, and k31 due to the substantially smaller intrinsic properties of the T phase.

关键词： Electric polarization Ferroelectricity Phase transitions Piezoelectricity Ferroelectrics Piezoelectrics Relaxor ferroelectrics Polarization

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Comparison of Several Active Disturbance Rejection control Methods for Rigid-Flexible Coupling Motion Stage

Comparison of Several Active Disturbance Rejection Control M...

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第三十八届中国控制会议

作者： Hao Peng Han Sun Zhijun Yang Wenchao Xue Sen Chen State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong Provincial Key Laboratory of Micro-Nano Manufacturing Technology and Equipment School of Electromechanical Engineering Guangdong University of Technology Key Lab.of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences

The accuracy of traditional direct drive motion stage with mechanical bearing is difficult to be effectively improved due to the nonlinear friction *** this paper,a rigid-flexible coupling motion stage is invented,which uses the elastic deformation of flexure hinges to compensate the friction dead ***,the high-frequency disturbance of the friction is transformed into the low-frequency elastic *** the invented motion stage is composed of both rigid and elastic parts,the control for the stage remains *** proportional-integral-derivative(PID)control and the active disturbance rejection control(ADRC)designed with eight different extended state observers(ESO)are rigorously ***,for the rigid-flexible coupling motion stage,the tracking performance of the ADRC is obviously better than the PID ***,the convergence speed of the reduced order ESO(RESO)is not necessarily fast than the full-order ***,among the different ESOs,the cascaded ESO design consisting of two full-order ESOs(ESO-ESO)has the fastest convergence speed.

关键词： Rigid-flexible coupling motion stage active disturbance rejection control extended state observers

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Tracking control of a compliant XY nano-positioner under plant uncertainty using a transfigured loop-shaping H∞ controller

Tracking control of a compliant XY nano-positioner under pla...

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IEEE International Conference on Automation science and Engineering (CASE)

作者： Hui Tang Yangmin Li Qinmin Yang Department of Electromechanical Engineering Faculty of Science and Technology University of Macau Taipa Macao China Overseas Distinguished Professor at the State Key Laboratory of Robotics of Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Department of Control Science and Engineering Zhejiang University Hangzhou China

This paper presents tracking control of a compliant XY nano-positioner using a transfigured loop-shaping H ∞ (TLSH) control strategy, which is capable of achieving satisfied positioning performance. The employed compliant nano-positioner is featured with a symmetric 4-PP (P represents prismatic joint) structure in which four-bar flexures are designed as the prismatic joints, meanwhile two embedded piezoelectric ceramic actuators (PZT) are adopted. Based on the identified plant transfer function of the nano-positioner, the presented control strategy and the traditional PID controller are implemented with different input scanning frequencies of 0.5 Hz and 2.5 Hz for comparisons. Both the simulation results and the practical experimental results demonstrate that the presented TLSH control method obviously performs better than the traditional PID method in the presence of plant model uncertainty, which will be applied to perform practical micromanipulation tasks.

关键词： Mathematical model Uncertainty Hysteresis Nanobioscience Actuators Robustness

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LSTM-based Frequency Hopping Sequence Prediction

LSTM-based Frequency Hopping Sequence Prediction

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Gao Li Jianliang Xu Weiguo Shen Wei Wang Zitong Liu Guoru Ding Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information Technology Nanjing University of Aeronautics and Astronautics Nanjing China Science and Technology on Communication Information Security Control Laboratory No.36 Research Institute of CETC Jiaxing China College of Communications Engineering Army Engineering University China

ISBN: (数字)9781728172361

ISBN: (纸本)9781728172378

The continuous change of communication frequency brings difficulties to the reconnaissance and prediction of non-cooperative communication. The core of this communication process is the frequency-hopping (FH) sequence with pseudo-random characteristics, which controls carrier frequency hopping. However, FH sequence is always generated by a certain model and is a kind of time sequence with certain regularity. Long Short-Term Memory (LSTM) neural network in deep learning has been proved to have strong ability to solve time series problems. Therefore, in this paper, we establish LSTM model to implement FH sequence prediction. The simulation results show that LSTM-based scheme can effectively predict frequency point by point based on historical HF frequency data. Further, we achieve frequency interval prediction based on frequency point prediction.

关键词： Predictive models Time-frequency analysis Frequency control Training Time series analysis Logic gates Spread spectrum communication

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