Xiaomei Xie

University of Electronic Science and Technology of China

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Limei Xu

University of Electronic Science and Technology of China

Omar Mechali

University of Electronic Science and Technology of China

Mingzhu Wei

University of Electronic Science and Technology of China

Min Chen

University of Liverpool

Jamshed Iqbal

University of Hull

Min Chen

University of Electronic Science and Technology of China

Xuesheng Li

University of Electronic Science and Technology of China

Min Yang

Institute of High Energy Physics

Xin Chen

Southeast University

Zhibo Geng

Nanjing University of Aeronautics and Astronautics

Cooperative Institutions

University of Electronic Science and Technology of China

Nanjing University of Aeronautics and Astronautics

Chinese Academy of Sciences

Huzhou University

Sichuan University

Chongqing Medical University

Zhejiang University

Nanjing Tech University

Chongqing University

National University of Defense Technology

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Influence of the Case of the Limiting Current Oxygen Sensor on the Steady-state Temperature of the Sensor

2022 IEEE International Conference on Mechatronics and Automation (ICMA) (2023)

Min Chen Shuai Ni Xiaomei Xie Min Yang Lei Li

The working temperature of the limiting current oxygen sensor is between 400 °C and 500 °C. When the working temperature drifts, the oxygen sensor will result in inaccurate measurement and low efficiency. The reasons that affect the working temperature drift of the oxygen sensor are not only the failure of the heating electrode, but also the heat transfer of the oxygen sensor to the case. Therefore, it is very important to study the influence of the oxygen sensor case on the steady-state temperature of the sensor. In this article, finite element analysis is used to investigate the effect of the case with different materials, heights, and opening diameters on the steady-state temperature of the oxygen sensor. The results show that the difference in case material directly affects the overall heat transfer ability of the oxygen sensor, thereby affecting the working performance of the oxygen sensor. In this process, the most influential indicator is the thermal conductivity of the material; Whether it is changing the height or the diameter of the opening of the outer case, the main impact of the outer case on the steady-state temperature of the oxygen sensor is the heat transfer between solids. Fewer outer case will result in less temperature loss. In summary, by analyzing the effects of different parameters of the oxygen sensor case on its steady-state temperature, this study provides important insights into the design of optimal oxygen sensor cases. The results can be used by researchers to develop new oxygen sensor designs that can perform better in terms of accuracy and efficiency.

Oxygen sensor

Limiting oxygen concentration

Limiting

Oxygen transport

10.1109/icma57826.2023.10215721

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Passive acoustic detection of diver based on SVM

Wu Zhao Hong Chen Longfeng Xiang Xiaomei Xie Min Chen

In terms of divers equipped with open-circuit respirator, this paper studies the radiated mechanism of the divers' breathing signals. A SVM(Support Vector Machine) based approach to identify their radiated signal is proposed. In this method, the received signal is firstly processed using STFT(short-time Fourier transform). Then, the energy characteristics for sub-bands associated with the remarkable frequency is extracted to reduce the effect of random noise. Lastly, SVM-based method is applied to train many samples to obtain classifier related to classifying the diver. Based on the pool experiment, the comparison in accurate rate of recognition between the proposed SVM method and NMF (Normalized multi-band matched filter) based on setting threshold value in frequency domain is conducted. In addition, the problem of low efficiency of discriminating threshold value in detection in the case of irregular breath of diver is discussed. It is noted that passive diver recognition mainly depends on the divers' breathing signals and the SVM method has higher accuracy than the NMF according to the same set of data.

Threshold limit value

10.1109/icma.2016.7558635

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Citations (2)

DEPENDENCY OF EFFECTIVE MODULUS OF POLYCRYSTALLINE AGGREGATES ON MACRO-GEOMETRIC CONFIGURATION

International Journal of Applied Mechanics (2012)

Hui Fan Xiaomei Xie

Polycrystalline aggregates are made in different macro-geometric configurations (line, thin film, bulk configurations etc.) for various engineering applications. Different mechanical behaviors and properties have been noticed among these configurations. In the present study, a finite element scheme with statistical consideration is employed to systematically investigate the effective modulus of polycrystalline copper in various geometric configurations. The numerical results show that the macro-scale geometric configuration is a key factor in determining the effective modulus of polycrystalline aggregates. The influence of microstructure on the effective modulus is examined by comparing the Voronoi model and uniform square grain model. The negligible discrepancy between the above two models indicates that the simple uniform model is feasible in simulating the real microstructure of polycrystalline aggregates with low and medium anisotropy.

Macro

10.1142/s1758825112500317

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Citations (6)

Synchronization and calibration of a stereo vision system

Global Oceans 2020: Singapore – U.S. Gulf Coast (2020)

Xin Chen Xiangfei Wu Shiqi Gao Xiaomei Xie Ya Huang

In this paper, we design a stereo image and video acquisition system with adjustable baseline and relative angle. Stereo vision has been used both for field robotic navigation and 3D wave reconstruction. However, there has been inadequate documentation about the synchronization performance of such system. For a dynamically moving scene, such as the wave, any delay between the two cameras will affects the accuracy of the disparity map. The present study presents a physical process to measure the delay between the two cameras. Firstly, we obtain the maximum frame rate of camera when it is triggered by external signal. Then we adopt a free fall experiment to measure the delay between trigger intervals at maximum frame rate. The relationship between baseline distance, calibration checker box tile size and target distance is discussed. Two calibration tools, i.e. MATLAB and WASS are compared using a range of distances.

Frame rate

Baseline (sea)

Stereo cameras

SIGNAL (programming language)

10.1109/ieeeconf38699.2020.9389422

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Citations (2)

Low-Frequency Impedance Modulation Via Grid-Based Helmholtz Resonator Cavities

Zhonghui Ma Min Chen Xiaomei Xie Xuesheng Li Wonseok Yang

Helmholtz resonator

Modulation (music)

Helmholtz free energy

Helical resonator

10.2139/ssrn.5043133

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Two bipolar blue-emitting fluorescent materials based on 1,3,5-triazine and peripheral pyrene for organic light-emitting diodes

Dyes and Pigments (2017)

Y.F. Li Xiaomei Xie Xue Gong M.L. Liu Robert F. Chen

Solvatochromism

Quantum Efficiency

Triazine

10.1016/j.dyepig.2017.05.017

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Citations (15)

DOA Estimation for Incoherent Wideband Signals with Low Signal-to-noise Ratio

2022 IEEE International Conference on Mechatronics and Automation (ICMA) (2023)

Yuxiu Lin Kaifei Ji Xiaomei Xie Min Chen Xuesheng Li

The test of orthogonality of projected subspaces (TOPS) is a classical incoherent wideband direction of arrival algorithm. However, TOPS and its improved algorithms have limitations in low signal-to-noise ratio (SNR) scenarios, such as poor resolution and the emergence of pseudo-peaks. To overcome these limitations, an improved algorithm is proposed in this paper. The noise subspace is estimated via the covariance matrix to avoid a priori knowledge about the number of sources. Also, a modified matrix using the orthogonality between the array manifold and the noise subspace is constructed and the spatial spectrum of signals using the Frobenius norm of the matrix is determined. Simulation results indicate that the proposed algorithm could effectively enhance the estimation accuracy and resolution even at low SNR while avoiding pseudo-peaks at any SNR.

Wideband

Orthogonality

Signal subspace

Matrix (chemical analysis)

10.1109/icma57826.2023.10215898

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Design and Optimization of 2-MMPPHR Based on Micro-Perforated Panels and Helmholtz Resonators

2022 IEEE International Conference on Mechatronics and Automation (ICMA) (2024)

Wanpeng Jiao Min Yang Zhonghui Ma Yinchong Fu Min Chen

Helmholtz free energy

10.1109/icma61710.2024.10633059