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research on urban water demand prediction based on machine learning and feature engineering

Water Supply 2024年第7期27卷 2247-2258页

作者： Yan, dongfei Tao, Yi Zhang, Jianqi Yang, Huijia Post-Doctoral Research Center Xi'an Aerospace Automation Co. Shaanxi Xi'an710065 China R&D Center Xi'an Aerospace Automation Co. Shaanxi Xi'an710065 China

Urban water demand prediction is not only the foundation of water resource planning and management, but also an important component of water supply system optimization and scheduling. Therefore, predicting future water demand is of great significance. For univariate time series data, the issue of outliers can be solved through data preprocessing. Then, the data input dimension is increased through feature engineering, and finally, the LightGBM (Light Gradient Boosting Machine) model is used to predict future water demand. The results demonstrate that cubic polynomial interpolation outperforms the Prophet model and the linear method in the context of missing value interpolation tasks. In terms of predicting water demand, the LightGBM model demonstrates excellent forecasting performance and can effectively predict future water demand trends. The evaluation indicators MAPE (mean absolute percentage error) and NSE (Nash-Sutcliffe efficiency coefficient) on the test dataset are 4.28% and 0.94, respectively. These indicators can provide a scientific basis for short-term prediction of water supply enterprises. © 2024 The Authors.

关键词： Machine learning

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Seamless Edge-Server Collaboration for real-Time digital Twin in Machining Process 20

Seamless Edge-Server Collaboration for Real-Time Digital Twi...

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20th CIrP Conference on Modeling of Machining Operations in Mons, CIrP CMMO 2025

作者： Besirova, Cemile Yucesan, Yigit Anil Sahin, Mehmet Alper Uresin, Ugur Lazoglu, Ismail Ford Otosan R&D Center Istanbul34885 Turkey Koç University Manufacturing and Automation Research Center Istanbul34450 Turkey

With the rise of smart manufacturing systems aimed at creating efficient and cost-effective environments for mass production, various process data acquisition techniques and data models have been developed for CNC manufacturing to enable the creation of digital Twin (dT) models. This article proposes an edge-server collaborative data architecture collecting crucial CNC machine data, including servo motor parameters, cutting tool information, and sensor data such as vibration, pressure, and temperature. The architecture is designed to process real-Time data during mass production with minimal latency, considering the high-speed nature of machining processes, while also storing historical data in a data Lake for the development of AI models. An infrastructure for digital Twin of the brake disc machining process is created, a particularly challenging task due to the complex geometry of the disc and the unique material characteristics of cast iron. during machining, sudden tool failures or even brake disc breakages can occur due to the heterogeneous nature of cast iron. Given that brake discs are critical safety components in automobiles, monitoring process data linked to the cast iron and cutting tool supply chain during mass production is essential. digital Shadow serves as a foundation for real-Time anomaly detection, predictive maintenance, and tool wear prediction models. This paper also proposes several deterministic modeling approaches for real-Time anomaly detection, predictive maintenance, and remaining useful life predictions for cutting tools. These models leverage machine data such as spindle and feed-drive motor currents, load, and positional errors during brake disc machining, in combination with sensor data, including temperature, pressure, electrical power, and vibration, to enhance the monitoring and optimization of the machining process. © 2025 The Authors.

关键词： Machining centers

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Converter Station Monitoring System ser Optimization Technology 8

Converter Station Monitoring System ser Optimization Technol...

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8th Asia Conference on Power and Electrical Engineering, ACPEE 2023

作者： Wu, Shiwei Liu, Wenbiao Ji, Ling Tan, Tingfang Automation Limited Company R&D Center of GuoDian Nanjing Nanjing China

ISBN: (纸本)9798350345520

In the context of the demand for large-scale clean energy grid connected transmission, the development of flexible dC transmission projects in China has been accelerated, and the controllability of flexible dC transmission projects for power transmission has been further enhanced. In addition to the process control of power production and transmission, the control of power electronic devices such as converter valves is added, which increases the number of control objects and expands the scale. In order to ease the monitoring work of operators, the coupling relationship between devices and the hierarchical relationship of alarms are analyzed from the primary device model and connection relationship, so as to facilitate the analysis of abnormal alarm information. © 2023 IEEE.

关键词： Electric power transmission

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dual Safety-Oriented Urban rail Transit Cloud Signaling System 24

Dual Safety-Oriented Urban Rail Transit Cloud Signaling Syst...

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24th COTA International Conference of Transportation Professionals: resilient, Intelligent, Connected, and Lowcarbon Multimodal Transportation, CICTP 2024

作者： Zhao, Xiaofeng Dept. of R&D Center Shanghai Electrical Automation D&R Institute Co. Ltd. Shanghai China

ISBN: (数字)9780784485484

ISBN: (纸本)9780784485484

In order to promote overall construction of smart urban rail and improve digitalization level of signaling, on the basis of ensuring functional safety and cyber security, signaling Cloud-Edge collaboration solution is planned to be researched, including system-level cloud platform architecture and failure mode, automatic train supervision ATS subsystem cloud application standardization, wayside automatic train protection ATP/automatic train operation ATO and interlocking subsystems SIL4 data center architecture, onboard ATP/ATO subsystems Cloud-Edge collaboration mechanism, and data communication dCS subsystem integration with cloud platform. At last, for more and more signaling retrofit projects, discuss the feasibility of Cloud-Edge collaboration solution involved in communication-based train control CBTC system, fully automatic operation FAO system, and train autonomous circumambulation TACS system. © ASCE.

关键词： Automatic train control

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The Simulation Study of Miro-Inductor Based Planar Spiral MEMS Coil Arrays 3

The Simulation Study of Miro-Inductor Based Planar Spiral ME...

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3rd International Symposium on Sensor Technology and Control, ISSTC 2024

作者： Pi, Xingyu Zhao, Lingzhe Sun, Xuecheng Zhang, Jianchun Qiu, Xiang Li, Shenhao Shanghai University Microelectronic R&D Center Shanghai University School of Mechatronic Engineering and Automation Shanghai China

ISBN: (纸本)9798331541637

The miniaturization of portable electronic devices has driven the demand for smaller electronic components. Traditional inductors limited by conventional manufacturing processes was hard to achieve both small size and high inductance. and are limited by conventional manufacturing processes. recently, with MEMS technology developing, it is possible to fabricate of high-performance micro-inductor. This paper was aim to design a high-performance micro-inductor based on a planar spiral MEMS coil array. The structure was analyzed and optimized by simulation. The simulation results show that with optimized parameters, the designed micro-inductor significantly improves in inductance value and maximum current-carrying capacity, meeting the application needs of electronic products. © 2024 IEEE.

关键词： Miniature instruments

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The Simulation of AC Power Grid detection By MEMS Microcoils 3

The Simulation of AC Power Grid Detection By MEMS Microcoils

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3rd International Symposium on Sensor Technology and Control, ISSTC 2024

作者： Chen, Xiaolong Wang, Pengyu Sun, Xuecheng Shanghai University Microelectronic R&D Center Shanghai University School of Mechatronic Engineering and Automation Shanghai China

ISBN: (纸本)9798331541637

Smart grid monitoring plays a pivotal role in optimizing power distribution and minimizing energy wastage, especially relying on current detection methods. The traditional current detection device was bulky, costly and inconvenient to install. This paper was aim to study the theoretical feasibility of alternating current detection of based microcoil fabricated by MEMS technology for Power grid monitoring. The power transmission line and microcoil model was established, and the influence of different coil arrangement on the detection current was studied. The simulation results verified that the detection of alternating power grid based on MEMS microcoil was feasible. driven by an alternating current of 500 amperes at a frequency of 50 Hertz, the microcoils arranged in an array can induce a current of up to 68 microampere at a certain distance, and the detection performance can be further improved by adjusting the array and placement mode. The results of simulation calculations provided a certain theoretical guidance for the design and fabrication of current sensors based on MEMS microcoils. © 2024 IEEE.

关键词： Power grids

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Sequential delay-free strategy for sliding mode position observer considering analog and digital implementations of PMSM drives

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International Journal of Computer Integrated Manufacturing 2024年第4期37卷 408-422页

作者： Li, Wenzhen Liu, Jinglin Han, Yaofei Gong, Chao School of Automation Northwestern Polytechnical University Shaanxi Xi’an China National Maglev Transportation Engineering R&D Center Tongji University Zhejiang Shanghai China

This paper proposes a sequential delay-free strategy to avoid side effects of the delays arising from both analog and digital implementations of permanent magnet synchronous machine (PMSM) drives on the accuracy of sliding mode position observers used in the high-speed conditions. First, after establishing the sliding mode observer (SMO) used for position estimation, the principles of the analog delay, low-pass filter (LPF) delay and execution delay together with their impacts are presented at length, posing the necessity of investigating the delay-free techniques. Then, novel current-based, position-based and speed-prediction-based compensation strategies are developed to deal with the three kinds of delays, respectively. Because the proposed compensation strategies are achieved based on the direct signal compensation theories, they are simple to be understood and implemented in practice. Third, the implementation sequence of the sequential delay compensation-based SMO is illustrated clearly. Thanks to the proposed delay compensation approaches, not only the position estimation accuracy but also the current regulation process of the closed-loop control can be improved. Finally, experiment is conducted on a three-phase 8000 rpm PMSM to verify the effectiveness of the proposed delay compensation-based SMO algorithms. © 2022 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Permanent magnets

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robotic System Performing dynamic Interaction in Human-robot Cooperative Work for Assembly Operation

Robotic System Performing Dynamic Interaction in Human-Robot...

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2024 IEEE/SICE International Symposium on System Integration, SII 2024

作者： Nakamura, Satoshi Arias, Carolina Higuera Bhardwaj, Mohak Boots, Byron Hitachi Ltd. Connective Automation Innovation Center R&d Group Robotics Research Department Japan University of Washington United States

ISBN: (纸本)9798350312072

In order to realize human-robot cooperative work, it is necessary to have dynamic interaction for unexpected human's motion that are difficult to define in advance. In this research, we propose a robotic system that supports operator work without interfering with human work by reacting and avoiding operator motion through real-time motion generation and activation re-planning. This system is included 3d recognition of the robot's surroundings and real-time motion generation technology. We implemented in the setup of assembly work assuming a high-mix, low-volume production site, and was demonstrated in a support task that robot distribute the parts for operator's assembly work. Experimental results show that the robot can conduct the cooperative work without interfering with operator work by performing appropriate avoidance actions against operator motion. © 2024 IEEE.

关键词： robot programming

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research on Motion Characteristics of AC Breaking Arc Under different Contact reed Circuits 3

Research on Motion Characteristics of AC Breaking Arc Under ...

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3rd Asia Power and Electrical Technology Conference, APET 2024

作者： Zhang, Peng Peng, Yong Zhang, Linliang Chen, Jianyi Zheng, Xubin Liu, Xiangjun School of Electrical Engineering and Automation Fuzhou University Fuzhou China R&D Center Zhejiang Great Electrical Co. Ltd Jiaxing China

ISBN: (纸本)9798350367690

Unlike most dC relays that require permanent magnets for arc blowout, AC magnetic latching relays do not have a permanent magnet installed, nor do they have any other arc-extinguishing measures. Instead, they rely on the contact separating to lengthen the arc, and extinguish the arc at the zero crossing of the AC current. The AC arc, under the influence of the magnetic field generated by the contact reed system, undergoes motion. This moving arc not only erodes the contacts but also potentially ablates and damages the plastic connecting rod in the force transmission mechanism, dynamic reed, and walls of the arc extinguishing chamber. Therefore, the simulation models of two kind of AC magnetic latching relay with different contact reed structure are established. Based on electromagnetic field and magneto-hydrodynamic simulation, the arc motion directions under U-shaped and Z-shaped contact reed systems are studied and the accuracy of the models are verified by experiments. The results show that the arc motion directions are significantly influenced by the configuration of the contact reed system. Specifically, the arc blows towards the connecting rod in the U-shaped circuit, while it blows away from the connecting rod in the Z-shaped circuit. The research presented in this paper provides valuable insights for the optimal design, performance improvement, and load capacity enhancement of AC relays. © 2024 IEEE.

关键词： Permanent magnets

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Forward Monitoring for Automated Train Operation based on Sensor Fusion of Stereo Camera and LidAr

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Japanese railway Engineering 2023年第2期63卷 21-23页

作者： Suzuki, Yoshihiko Kimura, Katsityuki Ohdake, Tatsuya Takahashi, Yusuke Automation and Image Applied Systems R&D Department Infrastructure Systems Research and Development Center Toshiba Infrastructure Systems & Solutions Corporation Japan IoT Edge Laboratory Information and Communications Platform Laboratories Corporate Research & Development Center Toshiba Corporation Japan Assistance System Project Team Automation and Image Applied Systems R&D Department Infrastructure Systems Research and Development Center Toshiba Infrastructure Systems & Solutions Corporation Japan

This article describes the challenges in the use of the stereo camera for forward obstacle detection for automatic operation and verifies the possibility of the use of LidAr as a complementing device. Particularly, we evaluated the detection performance of LidAr under environmental conditions in which the stereo camera has difficulty in distance measurement. We confirmed that the detection performance of the stereo camera can be complemented by combining with LidAr to improve forward obstacle detection performance. We will further collect data under various weather conditions and conduct evaluation and performance verification. © 2023 Japan railway Engineers' Association. All rights reserved.

关键词： Optical radar

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