In this paper,the problem of training a recurrent neural network(RNN) controller to approximate an active disturbance rejection control(ADRC) is *** learning methods,online learning and offline learning,are *** the on...
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ISBN:
(数字)9789887581536
ISBN:
(纸本)9781665482561
In this paper,the problem of training a recurrent neural network(RNN) controller to approximate an active disturbance rejection control(ADRC) is *** learning methods,online learning and offline learning,are *** the online setting,the RNN learning controller is trained by the error of the control quantity compared to that of ADRC in real time,while for the offline setting,the RNN controller is trained by the error of the whole state trajectory compared to that of ADRC obtained in *** randomized weight initialization,success rates of trained online and offline RNN learning controllers are compared by ***,the robustness property of the trained RNN controller is analyzed.A metric of robustness,which can be calculated from the weights of the trained RNN controller is also proposed.
Mono-crystalline silicon is widely applied in the photovoltaic and the integrated circuit *** power supply,as the key element of the mono-crystalline silicon growth furnace,plays an important role in the performance o...
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ISBN:
(纸本)9781509009107
Mono-crystalline silicon is widely applied in the photovoltaic and the integrated circuit *** power supply,as the key element of the mono-crystalline silicon growth furnace,plays an important role in the performance of the whole *** this paper,we propose a new kind of two-stage silicon growth furnace heating power supply topology *** first stage three phase rectifier employs the compound active clamp zero voltage soft switching(CACZVS) three-phase power factor correction(PFC) converter to achieve unity power factor and DC bus voltage regulation,and the second stage DC/DC converter employs phase shifted full bridge zero voltage and zero current soft switching converter(FB-ZVZCS) to regulate the output *** with the heating power supply of non-controlled rectifier type or three-phase power factor correction circuit using hard switching,the proposed two-stage converter structure can achieve high power factor,high efficiency and more flexibility of *** simulation results show the correctness of the analysis.
In this paper, a new machine learning framework is developed for complex systemcontrol, called parallel reinforcement learning. To overcome data deficiency of current data-driven algorithms, a parallel system is buil...
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In this paper, a new machine learning framework is developed for complex systemcontrol, called parallel reinforcement learning. To overcome data deficiency of current data-driven algorithms, a parallel system is built to improve complex learning system by self-guidance. Based on the Markov chain(MC) theory, we combine the transfer learning, predictive learning, deep learning and reinforcement learning to tackle the data and action processes and to express the knowledge. Parallel reinforcement learning framework is formulated and several case studies for real-world problems are finally introduced.
The gearbox of wind turbine has the longest downtime due to mechanical failure, and fatigue is the most important failure form of gearbox. Traditional wind reliability model not considering the influence of gear box o...
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ISBN:
(纸本)9781665434263
The gearbox of wind turbine has the longest downtime due to mechanical failure, and fatigue is the most important failure form of gearbox. Traditional wind reliability model not considering the influence of gear box of immobilized fatigue, this paper proposes a meter and gearbox fatigue reliability evaluation method of wind farms, this method is intuitive reflect the extent to which each gearbox fatigue damage caused by different failure rate difference, and applicable to other fatigue as the main failure forms of component reliability modeling. The fatigue failure rate model of wind turbine gearbox was established based on the fatigue analysis of wind turbine gearbox, and the fatigue failure state was embedded into the conventional wind turbine Markov model through the failure rate, which was applied to the reliability evaluation of containing wind farm to improve the evaluation accuracy. The results show that ignoring the gearbox fatigue failure will lead to the wind turbine outage risk assessment results are relatively conservative, overestimate the reliability level of wind farm, and the more serious the accumulation of gearbox fatigue damage, the more significant the impact on the system reliability.
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 configurat...
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.
In this paper, the frequency properties of Active Disturbance Rejection control（ADRC） are quantitatively studies. It’s proved that ADRC can guarantee a nice tracking performance as well as satisfied capabilities of...
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In this paper, the frequency properties of Active Disturbance Rejection control（ADRC） are quantitatively studies. It’s proved that ADRC can guarantee a nice tracking performance as well as satisfied capabilities of resisting external disturbance and suppressing high-frequency noise. Then the phase margin and the permitted time delay with the variation of parameters of ADRC are quantitatively analyzed. Furthermore, based on the quantitative results, the relationship between the parameter ■ of ADRC, which is an estimation for unknown gain b, and the time delay permitted in the closed-loop systems is discussed. The simulation results are provided to show the significance of the theoretical results.
In this paper, a quantitative lower bound to the bandwidth of the extended state observer（ESO） used in the active disturbance rejection control（ADRC） is given for a class of second-order nonlinear uncertain system...
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In this paper, a quantitative lower bound to the bandwidth of the extended state observer（ESO） used in the active disturbance rejection control（ADRC） is given for a class of second-order nonlinear uncertain systems with unknown gain b of control input. Then, it is proved that the closed-loop systems are stable and have satisfied dynamic tracking performance under the above quantitative lower bound condition of ESO bandwidth. Furthermore, based on the theoretical results, the relationship between the parameter ■ of ADRC, which is an estimation for unknown gain b, and the dynamic performance of the closed-loop systems is discussed. The simulation results are provided to show the significance of the theoretical results.
Train ground communication systems for different applications are deployed and managed independently in current urban rail transit systems with Wireless Local Area Network(WLAN) technology. Investing and constructing ...
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ISBN:
(纸本)9781509009107
Train ground communication systems for different applications are deployed and managed independently in current urban rail transit systems with Wireless Local Area Network(WLAN) technology. Investing and constructing communication infrastructures repeatedly not only waste substantial social resources but also bring many difficulties to maintain all these infrastructures. In this paper, we design an Integrated TD-LTE based train ground communication system which includes all the applications in the urban rail transit system and analyze its theoretical throughput. In order to test the throughput of the Integrated TD-LTE based train ground communication system, a real testing environment is set up. The testing environment simulates the real urban rail transit environment, including the real train and real equipment. Test results show that the designed Integrated TD-LTE based train ground communication system throughput satisfies urban rail transit communication requirement and has strong comprehensive bearing capability.
Motor systems are critical equipment in modern *** make the equipment maintenance more efficient,this paper proposes an online and remote machine condition monitoring and fault diagnosis system for motor system based ...
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ISBN:
(纸本)9781479900763
Motor systems are critical equipment in modern *** make the equipment maintenance more efficient,this paper proposes an online and remote machine condition monitoring and fault diagnosis system for motor system based on WIA-PA(Wireless network for Industry Automation Process Automation).The system continuously monitors the status of the target motor systems using wireless vibration *** extracting the feature of vibration signals,the wireless vibration transmitters send feature data to host computer through WIA-PA wireless sensor *** data are processed further in host computer to make diagnosis for the motor system using the customized expert *** paper describes the structure of the system,vibration transmitter,WIA-PA wireless network and host computer system in *** proposed system was tested in field,and the results are presented.
Crack detection is very important for long-term large-scale structural health monitoring(SHM).Fiber optic sensor has been approved to have good performance in application in *** this paper,we present a novel method to...
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Crack detection is very important for long-term large-scale structural health monitoring(SHM).Fiber optic sensor has been approved to have good performance in application in *** this paper,we present a novel method to monitoring the crack by using long-gauge FBG sensor.A FBG with a gauge length of 50 mm is *** the crack pass through the FBG,the reflect spectrum of FBG will be expanded or *** position of the crack will result in different Shape of the *** analyzing the characteristics of the spectrum,the position of the crack can be detected and the opening width of the crack can be estimated.
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