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2024 IEEE International Conference on robotics and Biomimetics, ROBIO 2024

作者： Lan, Tianbo Ding, Jiang Li, Jingyu Xie, Fengran He, Kai Zuo, Qiyang School of Mechanical Engineering Guangxi University Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology Nanning530004 China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China Guangxi University State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Nanning530004 China School of Artificial Intelligence Shenzhen Polytechnic University Shenzhen518055 China

ISBN: (纸本)9781665481090

This paper presents a novel biomimetic rudder-controlled autonomous underwater vehicle (BRCAUV) that is capable of operating at all speed range (i.e. including high, medium, low, and even zero speeds) for both wide-area cruising and localized fine observation tasks. This AUV integrates a top rudder, a propeller, and two-degree-of-freedom (DOF) biomimetic rudder wings on both sides of the aft section, enabling it to perform various tasks in a single underwater operation. These tasks include wide-area cruising at medium to high speeds and fine observation at low and even zero speeds. The prototype is equipped with a propeller, a biomimetic dorsal fin, two pectoral fins(i.e. two-DOF biomimetic rudder wings), and a buoyancy regulation system. At medium to high speeds, the AUV utilizes a combination of the propeller and pectoral fin movements for ascent and descent. At low or zero speeds, the biomimetic pectoral fins are used for complex maneuvers such as buoyancy adjustment, roll, and pitch. This paper develops a dynamic model of the pectoral fins based on quasi-steady theory, elucidating the principles of low-speed steering. Experimental were carried out and the results validate the prototype's low-speed steering capabilities, so that new approaches were presented to enhance the maneuverability, multifunctionality, and practicality for underwater vehicles. © 2024 IEEE.

关键词： Buoyancy

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10-Hertz squeezed light source generation on the cesium D_(2)line using single photon modulation

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Frontiers of physics 2023年第3期18卷 167-174页

作者： Guan-Hua Zuo Yu-Chi Zhang Gang Li Peng-Fei Zhang Peng-Fei Yang Yan-Qiang Guo Shi-Yao Zhu Tian-Cai Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Collaborative Innovation Center of Extreme OpticsInstitute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China College of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China Department of Physics Zhejiang UniversityHangzhou 310027China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China

Generation of squeezed light source is a promising technique to overcome the standard quantum limit in precision ***,we demonstrate an experimental generation of quadrature squeezing resonating on the cesium D_(2)line down to 10 Hz for the first *** maximum squeezing in audio frequency band is 5.57 ***,we have presented a singlephoton modulation locking to control the squeezing angle,while effectively suppressing the influence of laser noise on low-frequency *** whole system operates steadily for *** generated low-frequency squeezed light source can be applied in quantum metrology,light–matter interaction investigation and quantum memory in the audio frequency band and even below.

关键词： squeezed state optical parametric amplifier low-frequency squeezing

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Electrification Test Device and Method for Two-Phase Flow 18th

Electrification Test Device and Method for Two-Phase Flow

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Liu, Yufan Xu, Yongsheng Luo, Bing Zhao, Zhibin State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China Electric Power Research Institute China Southern Power Grid United Laboratory of Advanced Electrical Materials and Equipment Support Technology CSG Guangzhou China

ISBN: (纸本)9789819714193

Phase change cooling system is a key component of high power electronic equipment, and its insulation performance plays a very important role in the stable operation of power system. Aiming at the problem of two-phase flow charging in the phase change cooling system, a device for generating and detecting two-phase flow charging is designed in this paper, and a test method for two-phase flow and single-phase flow charging is proposed. First of all, it can generate two-phase flow, control the two-phase flow in a certain boiling state to measure the flush current, simulate the actual condition of phase change media in high-power power electronic equipment. Secondly, it can measure the charging of single-phase liquid flow at the same time and compare the charging degree of the same phase change medium in the two-phase state and the monomeric state. Finally, the specific operation process of charging the two-phase flow and single-phase flow is given. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Two phase flow

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10 λ ×3.26Tb/s CPRI-Equivalent Rate 1024-QAM DA-RoF Fronthaul in Single-Mode Fiber Using Coherent-Compliant DSP

10 λ ×3.26Tb/s CPRI-Equivalent Rate 1024-QAM DA-RoF Fronth...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Yixiao Zhu Xiansong Fang Chenbo Zhang Lingjun Zhou Jiayu Zheng Yicheng Xu Xiaopeng Xie Fan Zhang Qunbi Zhuge Weisheng Hu State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing China

We experimentally demonstrate high-capacity coherent DA-RoF fronthaul leveraging pilot symbol- and BPS-based carrier phase recovery. Up to 4.42- This and 32.6- This CPRI-equivalent rates are achieved with single-carri...

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Experimental Study on Insulation of Submerged Phase Change Cooling Deicing Device 1

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Yu, Shuaiyun Xu, Yongsheng Luo, Bing Zhao, Zhibin State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Electric Power Research Institute China Southern Power Grid United Laboratory of Advanced Electrical Materials and Equipment Support Technology CSG Guangzhou China

ISBN: (数字)9789819714209

ISBN: (纸本)9789819714193

The submerged phase change cooling technology has excellent heat transfer performance, can reduce the ground occupation of the ice melting device, and has good economic benefits. The application of immersion phase change cooling technology to the converter valve of the ice melting device will make the valve section in the complex environment of gas-liquid two-phase state, and it is necessary to carry out insulation test on the valve section in the two-phase flow state. This paper provides the method of reliable and stable generation of two-phase flow, summarizes the insulation test items that need to be carried out in the valve section of two-phase flow, and provides the criterion of passing the insulation test. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Two phase flow

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Study on the tightening scheme of electronic component screw assemblies based on finite element simulation

Study on the tightening scheme of electronic component screw...

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2024 International Conference on Mechatronics, robotics and Control system, MRCS 2024

作者： Guan, Wei Yi, Qingsi Mo, Qiuyun Jiang, Tao Wang, Siyuan Lei Zhao, Ying Country State-owned Changhong Machinery Factory Guangxi541004 China College of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guangxi541004 China Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology Guangxi541004 China

To improve the fastening effect of electronic components in mechatronic equipment, the tightening sequence and frequency have a significant impact on the structural performance of these components. This study identifies an optimal fastening method through experimental verification, although some measurement errors were noted;the method remains highly reliable. First, theoretical calculations and experimental analyses were conducted to determine the torque values under different conditions. Then, simulations were performed to study the impact on the stress of each screw. Finally, experimental validation of the simulation results was carried out, and a linear relationship (with a value of 0.82) between the measured and theoretical values was explored. Consequently, an optimized screw group fastening method is proposed, and the torque calculation process is simplified, thereby enhancing the reliability and lifespan of electronic components in mechatronic systems. © Published under licence by IOP Publishing Ltd.

关键词： Screws

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Comparative Analysis on Switching Characteristics of Discrete SiC MOSFET in Press-pack Package and Wire-bonded Package 3

Comparative Analysis on Switching Characteristics of Discret...

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3rd IEEE International Power Electronics and Application Conference and Exposition, PEAC 2022

作者： Zhu, Zheyan Yao, Ran Li, Hui Li, Jinyuan Chen, Zhongyuan Chong Qing University State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing China Beijing Institude of Smart Energy State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (数字)9781665491419

ISBN: (纸本)9781665491419

In view of the problem that the package parasitic inductance of the TO-247-3 wire-bonded discrete SiC MOSFET seriously affects its high-frequency switching characteristics, a press-pack package structure for discrete SiC MOSFET is designed and the influence of the two package structures on the switching characteristics of SiC MOSFET is compared in this paper. Firstly, a press-pack packaging method for small-sized discrete SiC MOSFET is proposed. Next, the parasitic inductance of the two packages is extracted by Ansys Q3D, and the switching characteristics of the SiC MOSFET in two package structures are evaluated by Pspice. Finally, an inductance clamped double-pulse test platform is built for experimental verification. Simulation and experimental results show that at the same current level, the press-pack package discrete SiC MOSFET has the lower package parasitic inductance, resulting in faster switching speed and less switching loss. © 2022 IEEE.

关键词： Inductance

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Research on Identification Strategy of Fault-Sensitive Frequency for Planetary Gearboxes

Research on Identification Strategy of Fault-Sensitive Frequ...

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TEPEN International Workshop on Fault Diagnostics and Prognostics, TEPEN-IWFDP 2024

作者： Xie, Ruitong Zhang, Mian Chen, Jiwei Zhu, Songsong Wang, Zhiyuan Zhao, Mengxiong Xiang, Hongbiao Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechanical System Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Binshuixidao 391 Xiqing District Tianjin300384 China State Key Laboratory of Water Resources Engineering and Management Wuhan University Wuhan430072 China

ISBN: (纸本)9783031694820

Planetary gearboxes find extensive application in wind power generation, aerospace, industrial production and other fields. Harsh operational conditions and prolonged periods of continuous work often lead to various gear damages. Therefore, it is important to continuously monitor the health status of planetary gearboxes. However, the fault-sensitive frequencies of planetary gearboxes used in the existing signal models and fault diagnosis indicators are calculated theoretically or searched artificially. In response to this, this paper proposes a strategy for identifying fault-sensitive frequencies in planetary gearboxes intelligently by combining spectral amplitude analysis with three models: Random Forest (RF), Support Vector Machine (SVM) and Deep Neural Network (DNN). Experiments are carried out to verify the effectiveness and superiority of the proposed strategy. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Deep neural networks

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Manual Alignment of Dual End-Effectors for Piezo-Driven Microhand

Manual Alignment of Dual End-Effectors for Piezo-Driven Micr...

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2024 IEEE International Conference on Real-Time Computing and robotics, RCAR 2024

作者： Pang, Jichao Liu, Dan Tang, Xiaoqing Chen, Yan Huang, Qiang Arai, Tatsuo Liu, Xiaoming Key Laboratory of Biomimetc Robots and Systems Ministry of Education State Key Laboratory of Intelligent Control and Decision of Complex System Beijing Advanced Innovation Center for Intelligent Robots and Systems School of Mechatronical Engineerin Beijing Institute of Technology Beijing100081 China The University of Electro-Communications Center for Neuroscience and Biomedical Engineering Tokyo182-8585 Japan

ISBN: (纸本)9798350372601

In recent years, micromanipulator with dual end-effectors called microhand has been widely used in industrial and biological fields. Whether the tip positions of the two end-effectors of the microhand can be accurately aligned seriously affects the precise grasping of the microhand. However, few researchers have presented practical ways for precisely aligning the tip positions of a 6-DOF microhand's two end- effectors. This paper proposes a novel, inexpensive, lightweight, robust, and easy-to-use microhand dual end-effectors clamping device that can precisely and quickly align the two end-effectors of a 6-DOF microhand. First, we describe the microhand dual end-effectors clamping device's lightweight structural design. After that, we simplify the microhand dual end-effectors clamping device model and create a mathematical model to determine the relationship between the end-effectors' tip position and the rotation angles of screw No.1, screw No.2, screw No.3 of the microhand dual end-effectors clamping device. Through experimentation, we are able to attain precise alignment of the two end-effectors tip positions of the 6-DOF microhand, so we confirm that our mathematical model is true. Finally, we use the impulse response of PZT in the microhand's lower module to confirm the stability of the microhand dual end- effectors clamping device. We believe that the proposed the microhand dual end-effectors clamping device has great potential in industrial and biological applications as a universal tool for precise alignment of the tip positions of the two end-effectors of a 6-DOF microhand. © 2024 IEEE.

关键词： Clamping devices

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An Order Demodulation Analysis Method for Planetary Gearboxes

An Order Demodulation Analysis Method for Planetary Gearboxe...

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TEPEN International Workshop on Fault Diagnostics and Prognostics, TEPEN-IWFDP 2024

作者： Chen, Jiwei Xie, Ruitong Zhu, Songsong Zhao, Mengxiong Wang, Zhiyuan Zhang, Mian Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechanical System Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Binshuixidao 391 Xiqing District Tianjin300384 China State Key Laboratory of Water Resources Engineering and Management Wuhan University Wuhan430072 China

ISBN: (纸本)9783031694820

In addressing challenges such as the speed change of planetary gearbox (PG) during operation and the complexity in extracting fault features, an order demodulation analysis method based on order tracking (OT) and variational mode decomposition (VMD) is proposed. Non-stationary time domain signals are transformed into relatively stable angular domain signals through angular resampling. The intrinsic mode function (IMF) is obtained by demodulation of the angular multi-component signal using the VMD method. The instantaneous order of a proper IMF is calculated via Hilbert Transform. The sensitive single component is selected by matching the meshing order and the central order of the instantaneous order. Finally, the amplitude of the characteristic order components extracted from the instantaneous order spectrum was used as features and Support Vector Machine (SVM) was employed for the classification of four different conditions in the sun gear. Comparing the results of the proposed method with Deep Neural Networks (DNN) and Convolutional Neural Networks (CNN), the experimental results demonstrate the effectiveness of the proposed method in diagnosing PGs under non-stationary conditions. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Epicyclic gears

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