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2024 7th International Conference on Mechanical, Electrical and Material Application, MEMA 2024

作者： Le, Wang Pengtao, Huang Jun, Xiao Maofei, Geng State Key Laboratory of High-end Compressor and System Technology Hefei General Machinery Research Institute Co. Ltd. State Hefei230031 China University of Liverpool Liverpool United Kingdom

Low pressure compressor (LPC) serves the role of enhancing pressure levels of secondary steam at nominal pressure ratios (1.5), procured from the evaporator as a primary thermal energy source. A loss model has been proficiently proposed to rapidly predict the performance of the LPC. Instead of conventional lump sum loss equations, the model adopts well-established one-dimensional (1D) loss formulations scattered across scholarly publications. Given an explicit configuration of the LPC, the environmental conditions, rotational velocity, and capacity, static and total temperatures, static and total pressures, pressure reductions, polytropic head, and efficiencies of each individual segment of the compressor can be calculated. Validation of this model was done using computational fluid dynamics (CFD) analysis. This model renders it feasible to conduct a parametric examination of the impact of each loss apparatus on the LPC's capability, thereby aiding designers in substantiating design choices that minimize these losses and consequently positively influencing the comprehensive efficiency. © Published under licence by IOP Publishing Ltd.

关键词： compressors

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A Modified Iterative Learning Control Approach for the Active Suppression of Rotor Vibration Induced by Coupled Unbalance and Misalignment

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 242-253页

作者： Yifan Bao Jianfei Yao Fabrizio Scarpa Yan Li College of Mechanical and Electrical Engineering Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of High-end Compressor and System Technology Beijing 100029China Beijing Key Laboratory of High-end Mechanical Equipment Health Monitoring and Self-Recovery Beijing University of Chemical TechnologyBeijing 100029China Key Lab of Engine Health Monitoring-Control and Networking of Ministry of Education Beijing University of Chemical TechnologyBeijing 100029China Bristol Composites Institute(ACCIS) University of BristolBristol BS81TRUK Dynamics and Control Research Group(DCRG) University of BristolBristol BS81TRUK

This paper proposes a modified iterative learning control(MILC)periodical feedback-feedforward algorithm to reduce the vibration of a rotor caused by coupled unbalance and parallel *** control of the vibration of the rotor is provided by an active magnetic actuator(AMA).The iterative gain of the MILC algorithm here presented has a self-adjustment based on the magnitude of the *** filters are adopted to extract the synchronous(1×Ω)and twice rotational frequency(2×Ω)components of the rotor *** the notch frequency of the filter and the size of feedforward storage used during the experiment have a real-time adaptation to the rotational *** method proposed in this work can provide effective suppression of the vibration of the rotor in case of sudden changes or fluctuations of the rotor *** and experiments using the MILC algorithm proposed here are carried out and give evidence to the feasibility and robustness of the technique proposed.

关键词： Rotor vibration suppression Modified iterative learning control Unbalance Parallel misalignment Active magnetic actuator

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Research on Motor Fault Identification Method Based on Vibration Current Multisource Data Fusion and Deep Learning 14

Research on Motor Fault Identification Method Based on Vibra...

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14th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Hangzhou 2023

作者： He, Yiyi Feng, Kun Liu, Baoxia Key Lab of Engine Health Monitoring-Control and Networking of Ministry of Education Beijing University of Chemical Technology Beijing100029 China State Key Laboratory of High-end Compressor and System Technology Beijing University of Chemical Technology Beijing100029 China National Pipe Networknorth Company Pipeline Compressor Unit Maintenance Center Beijing University of Chemical Technology Beijing100029 China

ISBN: (纸本)9798350301359

Traditional motor fault diagnosis techniques are usually based on a single type of state parameter. However, the monitoring range of a single type of motor state parameters is very limited, and it is difficult to meet the needs of comprehensive fault diagnosis. The purpose of this paper is to propose a fault diagnosis method for typical AC induction motors by fusing two types of parameters, i. e. vibration data and current data, in order to improve the accuracy of diagnosis. Based on the analysis of the basic faults of typical AC asynchronous motors, this paper studies the methods of motor fault feature extraction, including Fast Fourier Transform (FFT) and Hilbert-Huang Transform (HHT). Then, the method of motor multi-sensor parameter fusion is studied, and the realization scheme of data fusion is designed. Convolutional neural network is constructed as a feature fusion tool. The results of fast Fourier transform (FFT) of current data and Hilbert-Huang transform (HHT) of voltage data of different fault types are input into CNN as fault features, and the deep-seated features are extracted by using CNN's feature extraction ability. Finally, the CNN network series Multilayer perceptron (MLP) was constructed to realize fault classification, and the motor fault identification and fault diagnosis were realized based on the motor vibration and current parameters. The results show that the motor fault diagnosis technology based on data fusion can improve the accuracy of diagnosis results, reduce the uncertainty caused by single parameter, and improve the accuracy of motor fault diagnosis. © 2023 IEEE.

关键词： data fusion deep learning fault diagnosis

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Mechanism of Seebeck coefficient variation at the output of NiCr/NiSi thin film thermocouple with different wires 3

Mechanism of Seebeck coefficient variation at the output of ...

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2023 3rd International Conference on Measurement Control and Instrumentation, MCAI 2023

作者： Liu, Zhihui Guo, Tengda Cheng, Yongjun Wang, Bi Shen, Kai Hu, Kai Zhou, Jiankang Zhang, Chuanbing Wang, Zixi Ding, Wanyu State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China College of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China Laboratory of Low Frequency Electromagnetic Communication Technology Wmcrt Cssc China State Key Laboratory of High-end Compressor and System Technology Hefei Anhui230031 China

In this paper, by using magnetron sputtering to prepare NiCr/NiSi thin film thermocouples, the static calibration method is used for NiCr/NiSi thermocouples with rapid temperature calibration experiments. Different temperature calibration curves are obtained. The Seebeck coefficient of NiCr/NiSi thin film thermocouples connected to NiCr/NiSi wires is significantly higher (41.39 μV/°C) than that of NiCr/NiSi wires (0 μV/°C). The Seebeck coefficient (41.39 μV/°C) of the NiCr/NiSi thin-film thermocouple connected to copper wire is significantly higher than that of the thermocouple connected to copper wire (0 μV/°C). The problem of the Seebeck coefficient of the K-type thermocouple is analyzed by experimental data, which provides the relevant parameter basis for the use of the K-type thermocouple. The method has the advantages of simple equipment, convenient operation, accurate and reliable data, and provides a basis for the sensor to measure the temperature measurement. © Published under licence by IOP Publishing Ltd.

关键词： Temperature measurement

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Anti-crosstalk Piezoresistive Flexible Three-dimensional Force Sensor for Dexterous Robot Hand 4

Anti-crosstalk Piezoresistive Flexible Three-dimensional For...

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4th International Conference on Sensing, Diagnostics, Prognostics, and Control, SDPC 2020

作者： Wang, Song Wang, Chenying Lin, Qijing Tian, Bian Peng, Niancai Jing, Weixuan Yang, Ping Niu, Zhongnan Han, Feng Jiang, Zhuangde Xi'An Jiaotong University State Key Laboratory for Manufacturing System Engineering Xi'an Shaanxi China Xi'An Jiaotong University Collaborative Innovation Center of High-End Manufacturing Equipment International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi'an Shaanxi China State Key Laboratory for Manufacturing System Engineering Xi'An Jiaotong University Xi'an Shaanxi China

ISBN: (纸本)9781728170503

The crosstalk and flexibility are two problems in three-dimensional force sensor with sandwich structure. In this paper, a piezoresistive flexible three-dimensional force sensor is presented. It consists of three parts: The bump layer, the pressure sensitive layer and the flexible electrode layer. The threedimensional force sensor has several independent pressure units isolated by PDMS and single-layer electrode structure. This kind of structure not only can suppress the crosstalk, but also has better flexibility. The three-dimensional force is measured by each layer cooperated. The measuring principle and preparation method of the three-dimensional force are studied here. It shows that the anti-crosstalk piezoresistive three-dimensional force sensor is realizable in the field of intelligent perception such as dexterous robot hand. © 2020 IEEE.

关键词： Crosstalk

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Applied to calibrate the new intelligent bearing of NiCr/NiSi film thermocouple 7

Applied to calibrate the new intelligent bearing of NiCr/NiS...

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7th International Conference on Aeronautical, Aerospace and Mechanical Engineering, AAME 2024

作者： Liu, Zhihui Guo, Tengda Cheng, Yongjun Wang, Bi Li, Yangsen Chen, Weiyu Wang, Zixi Ding, Wanyu State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing100084 China College of Materials Science and Engineering Dalian Jiaotong University Dalian116028 China Laboratory of Low Frequency Electromagnetic Communication Technology with the WMCRT CSSC China State Key Laboratory of High-end Compressor and System Technology Anhui Hefei230031 China State Grid Fuiian Electric Power Co. Ltd China Fujian Power Transmission and Transformation Engineering Co. Ltd China

The purpose of this paper is to study the calibration method of new intelligent bearing applied to NiCr/NiSi film thermocouple. Firstly, the basic principle and characteristics of NiCr/NiSi film thermocouple and intelligent bearing are introduced, and then the design and realization process of intelligent bearing are elaborated, including material selection, structural design, manufacturing process and so on. Then, this paper puts forward the calibration method of intelligent bearing, and verifies its effectiveness through experiments. The experimental results show that the Seebeck coefficient of NiCr/NiSi thin film thermocouple new intelligent bearing is 41.00 μV/°C, and the Seebeck coefficient of standard K thermocouple is 41.20 μV/°C. The new intelligent bearing has high sensitivity and stability, and can achieve fast response and accurate measurement. Finally, this paper summarizes the research results, and looks forward to the future research direction. © Published under licence by IOP Publishing Ltd.

关键词： Thermocouples

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FINITE ELEMENT-BASED COMPRESSION SIMULATION AND PERMEATION PERFORMANCE MEASUREMENT AND CONTROL OF high TEMPERATURE SEALING MATERIALS

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UPB Scientific Bulletin, Series D: Mechanical Engineering 2023年第2期85卷 103-118页

作者： Chen, Lifang Guo, Yixiang Key Lab of Engine Health Monitoring Control and Networking of Ministry of Education Beijing University of Chemical Technology Beijing100029 China State Key Laboratory of High-end Compressor and System Technology Beijing University of Chemical Technology Beijing100029 China

To obtain the characteristic operational parameters of spacecraft heat seals, a customized tester is used to carry out the structure and performance research of the P-shaped heat seals. A heat-sealing test system is built to simulate real working conditions. The structure and the plan of the tester are optimized based on the finite element thermal analysis method. For different compression rates and pore-opening structures, the leakage rates of the P-shaped seal are tested at room temperature, high temperature, and different air pressures. The test results show that the leakage of the P-shaped sealing ring decreases with the increase of compression rate and the number of openings on the outer high-pressure side. These results are following those of the finite element theoretical analysis. The main control factors that affect the size of seal leakage have been preliminarily determined, and the data obtained from the test has laid the foundation for future research on sealing theory. © 2023, Politechnica University of Bucharest. All rights reserved.

关键词： Seals

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Research on Working Characteristics Ofcomposite Two-Stage Ventilation Heat Recovery system with Heat Pipe and Heat Pump

SSRN

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SSRN 2023年

作者： Xu, Shuxue Niu, Jianhui Ma, Guoyuan Ma, Hongxia Wu, Junfeng Beijing University of Technology Beijing100124 China Hebei University of Architecture Zhangjiakou075000 China State Key Laboratory of High-end Compressor and System Technology Anhui Hefei230031 China

In this paper, a heat pipe heat pump composite two-stage ventilation heat recovery system is proposed, heat pipe is used to recover the exhaust air energy to improve the operating performance of the system under all operating conditions. The split heat pipe heat exchanger is designed and manufactured, the working characteristics and performance of the composite heat recovery system under different working conditions are tested, and it is compared with the parallel-loop heat pump ventilation heat recovery system also. The results show that the optimal working fluid charge rate of the split heat pipe used in the composite system is 50%~60%, the temperature efficiency of the composite system in winter is higher than 64.31%, the heating COP is up to 7.17, and the total heating capacity is 5.09 kW. Temperature efficiency and heating capacity of the system are 4.01%~66.6% and 7.68%~67.19% higher than that of the double loop heat pump heat recovery system, respectively. © 2023, The Authors. All rights reserved.

关键词： Heat pipes

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An Improved Initial Parameter Setting Method for Variational Time-Domain Decomposition

An Improved Initial Parameter Setting Method for Variational...

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Sensing, Measurement & Data Analytics in the era of Artificial Intelligence (ICSMD), International Conference on

作者： He Li Jiniie Zhang Zhinong Jiang Zhiwei Mao Key Laboratory of Engine Health Monitoring Control and Networking Ministry of Education Beijing University of Chemical Technology Beijing China State Key Laboratory of High-end Compressor and System Technology Beijing University of Chemical Technology Beijing China

Effectively decomposing vibration signals is crucial for identifying fault features and evaluating the performance of mechanical systems. Reciprocating mechanical vibration signals typically exhibit complex non-stationary and multi-impact characteristics, posing challenges in signal decomposition. Currently, in response to this issue, the Variational Time-Domain Decomposition (VTDD) method has been proposed to achieve outstanding adaptive impact separation in reciprocating mechanical vibration signals. However, VTDD has limitations in the initial parameter value settings, particularly when dealing with reciprocating mechanical signals under strong noise conditions, which result in slow convergence and less accurate decomposition. To address these limitations, this paper proposes an improved initial parameter value setting method based on a noise threshold-driven impact center estimation algorithm. This method preserves the impacts from vibration signals by estimating the noise threshold, then accurately estimates the number and positions of impacts, which is applied to replace the original VTDD parameter setting approach. Experimental results demonstrate that this improved method delivers excellent decomposition outcomes and applicability for both simulated and real mechanical vibration signals. In summary, by enhancing the initial parameter value setting, the VTDD method performance provides a more reliable tool for vibration signal analysis, especially in the challenging task of recognizing complex impact signals.

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Design and Performance Study of a Novel Variable Cross-Sectional Rotor for Twin-Screw Vacuum Pumps

SSRN

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SSRN 2024年

作者： Hou, Ruijie Li, Teng Wang, Jun Wang, Zengli Li, Zengyao Pan, Shiyang Cui, Dong Qingdao266580 China State Key Laboratory of High-end Compressor and System Technology Hefei General Machinery Research Institute Co. Ltd. Anhui Hefei230031 China

The variable cross-sectional rotor is considered as a potential technology to further improve the performance of twin-screw vacuum pumps, due to its remarkable advantages of large internal volume ratio. In this study, a mathematical model of variable cross-sectional rotors was established to obtain its generation method. A novel type of variable cross-sectional rotor was constructed by using the proposed method, and this rotor exhibits superior sealing performance. The variable cross-sectional rotor was geometrically compared with the traditional equal cross-sectional rotor. Then the accuracy of the proposed generation method as well as the advance of the generated variable cross-sectional rotor were verified by experimental test results. Results show that this design method achieves the construction of high accuracy variable cross-sectional rotors by generating 3-D helical surfaces. Compared with the traditional equal cross-sectional rotor, the geometric pumping speed and internal volume ratio of the variable cross-sectional rotor are increased by 7.57% and 10.45%, respectively. The volumetric efficiency of the variable cross-sectional rotor is increased by 6.52% and the time to reach the ultimate pressure is reduced by 9.42%, demonstrating superior pumping and sealing performance. © 2024, The Authors. All rights reserved.

关键词： Vacuum pumps

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