Simulation of Metal Surface Crack Detection of RFID TagantennaZhang, Shuang; Zhai, Wencheng; Hou, Daishuang
doi: 10.1088/1742-6596/2395/1/012036pmid: N/A
In view of the current situation of the traditional non-destructive testing technology for metal components, which is characterized by bulky equipment, slow detection speed, small detectable range, and low automation, a method based on the combination of microstrip antenna characteristics and radio frequency technology is proposed to design a microstrip RFID tag antenna based on microstrip antenna characteristics. By calibrating the position of the RFID reader with the tag antenna and the power of its transmitting antenna, the resonant frequency of the tag antenna is affected when cracks exist on the metal surface, resulting in a change in the recognition distance of the RFID system, thus realizing the detection of cracks on the metal surface. The antenna structure is optimized using the HFSS software to simulate the antenna in the presence of cracks on the metal surface, and the simulation results are found to be effective for metal surface crack detection.
Study on Process Parameters of Low-power Semiconductor Laser Stripping PTFE Insulating Layer of Aviation WireLi, Pin; Huang, Huiping; Wang, Ping; Huang, Guangwen; Zhou, Peimin; Tian, Chunlin
doi: 10.1088/1742-6596/2395/1/012025pmid: N/A
Faced with the increasingly high-quality requirements for the insulation layer stripping at the end of aviation wires, laser wire stripping technology is becoming more and more popular due to its good processing quality and production efficiency. Traditional laser wire strippers generally have problems of bulky size and high control cost and are not suitable for the decentralized processing of large wire harness products. This work explores the feasibility of using a low-power semiconductor laser to strip the PTFE insulating layer of aviation wires. The influence of the parameter changes of each processing factor on the cut morphology of the insulating layer was studied separately. It was found that higher laser power removed more insulating layers per unit of time, but reduced the cutting quality. High laser scanning speed can obtain good insulation cutting quality, but too large or too small scanning speed will reduce the stripping efficiency. Simultaneous improvements in insulation cutting quality and efficiency depend on the right mix of power and scanning speed.
Analysis of 330 kV B busbar tripping accident in a 330 kV substationJiang, Fei; Zhang, Zhaoyu; Zhang, Suhui; Gao, Jian
doi: 10.1088/1742-6596/2395/1/012013pmid: N/A
In this paper, the damage to the bus conductor and expansion joint caused by the tripping accident of bus B of a 330 kV line in Northwest China was taken as an example, and the reasons for the tripping accident were analyzed and improvement measures were proposed utilizing macro inspection and cross-cut test. The results showed that the main reason for this failure is that the manufacturer did not strictly implement the coating process, resulting in insufficient coating adhesion, and the coating gradually cracked and fell off during operation. The peeling coating caused air gap breakdown and ground flashover.
Orderly charging strategy for electric vehicles based on carrier wave communicationLv, Linjun; Zhang, Zhaoyun; Jia, Peiru
doi: 10.1088/1742-6596/2395/1/012008pmid: N/A
To solve the problem of the poor wireless signal in the use of charging piles in residential communities, this paper proposes a communication method using a power line carrier in the community charging system to achieve safe and reliable data communication. And the problem is that a large number of electric vehicles charging in a disorderly manner leads to an increase in the total peak load of the grid and affects the safe operation of the grid. In this paper, we propose to develop a suitable orderly charging plan to ensure the safe operation of the grid, with the least electricity price as the optimization target, and combined with V2G technology. The users are guided to charge during the valley period of electricity consumption, and when the grid operation load is too high, the grid operation pressure is linked by discharging electric vehicles to the grid. This strategy takes into account the security of the grid and the economy of the users, and to a certain extent, realizes the purpose of grid scheduling is to cut the peaks and fill the valleys, avoiding the sudden load change
PMSM Demagnetization Fault Diagnosis Based on Back-EMF SignalNian, Fule; Yu, Yinquan
doi: 10.1088/1742-6596/2395/1/012041pmid: N/A
To study the irreversible demagnetization fault of the permanent magnets (PMs) in the permanent magnet synchronous motor (PMSM), a two-dimensional Finite Element (FE) model of the PMSM is built by the Finite Element Method (FEM). Analysis of demagnetization faulty mechanism of the electric and magnetic signals under local demagnetization conditions is conducted. The no-load Back-EMF signal is adopted as the indicator of the demagnetization faults of PMSM. In this paper, the faults of uniform demagnetization and single magnet demagnetization are studied through FEA. Therefore, the relationship between the amplitude of the back EMF and the degree of demagnetization is obtained. Moreover, the fitting curve is obtained by using the least squares method from multiple sets of FEA results. The results show that the method can effectively diagnose the demagnetization fault of the PMs of the PMSM, and could provide the guideline for online health monitoring of the PMSM in future research works.
Study on Single Event Transient Pulse Characteristics of 16nm SOI FinFET DevicesYang, Shao-Hua; Lin, Qian; Zhang, Zhan-Gang; Peng, Chao; Wu, Fu-Gen
doi: 10.1088/1742-6596/2395/1/012019pmid: N/A
In this paper, the single event transient (SET) characteristics of the advanced 16 nm SOI FinFET device are investigated. The impacts of five different variables on the SET response of the 16 nm SOI FinFET device are investigated, including the incident position, particle LET value, particle characteristic radius, incident angle, and drain bias. It is found that 1) unlike traditional planar devices, the SET shape of the 16 nm SOI FinFET device changes significantly. The “SET tail” caused by charge diffusion disappears, the SET time width is at the magnitude of tens of ps, and the total collected charge is at the magnitude of fC. 2) The most sensitive region of SET is the center of the gate. Under the condition that the incident position is the center of the gate, the amount of collected charge is 1.33 times that of the center of the drain. 3) Under the premise of the same LET value, the larger the radius of the particle, the smaller the SET amplitude generated, due to the entire electron-hole pairs participating in the SET response with a smaller radius. 4) The larger the incident angle of the particle, the smaller the SET amplitude generated by the FinFET device. When the incident angle is 45°, the amount of charge collected at the drain is only 0.23 times that of the normal incidence. 5) Changing the drain bias of the device results in a nearly constant SET curve, which is one of the features that distinguishes the FDSOI device from other devices.
Vibration Analysis of the Non-abrasive Cryogenic Polishing Experimental DevicesXu, Anjun; Wang, Yan; Qi, Zhihui; Mu, Guozhen; Lv, Qiongying
doi: 10.1088/1742-6596/2395/1/012040pmid: N/A
Non-abrasive cryogenic polishing is a new method that can obtain ultra-smooth surfaces. For experimental devices, the vibration displacement, vibration frequency, and natural frequency can be obtained through model analysis under a 3D experimental model using ANSYS. Results show that the faster the ice wheel rotates, the smaller vibration of the experimental devices, and the higher the vibration frequency.
CNN-SVM Spectrum Sensing in Cognitive Radio Based on Signal Covariance MatrixWang, Qi; Guo, Bin
doi: 10.1088/1742-6596/2395/1/012052pmid: N/A
Among the basic components of cognitive radio technology is spectrum sensing technology. Cooperative spectrum sensing is also a crucial factor research directions of spectrum sensing. Due to the problems of channel fading and hidden nodes, the spectrum sensing based on a single node cannot meet the requirements of the cognitive radio system for the primary user (PU) detection performance. A spectrum sensing algorithm is based on CNN-SVM and covariance matrix. In this algorithm, the covariance matrix of the signal is input into the convolutional neural network for feature extraction. Secondly, the result of the fully connected layer is taken as the input of the support vector machine for training to obtain a classifier, and finally, spectrum sensing is performed. The simulation outcomes demonstrate that the algorithm suggested in this research works outperform other algorithms in this paper. When the signal-to-noise ratio is -14 dB, the false alarm probability is 0.1, the number of secondary users is 32, and the detection probability reaches 0.81.
Study on the Kinematics of Key Components of Film Bidirectional Synchronous Stretching EquipmentPan, Mingyu; Wang, Zheng
doi: 10.1088/1742-6596/2395/1/012020pmid: N/A
In this paper, the stretching chain clamp model in the film synchronous biaxial stretching equipment is simplified. And we establish the kinematic model. The variation rule of kinematic parameters of each joint of the chain clamp during the film stretching process is obtained. We use ADAMS software to inverse the trajectory of the stretching chain clamp to get the theoretical track and optimize the stretching rate of the stretching chain clamp. We compare the theoretical track with the initial stretching track model, optimize of stretching system structure, and achieve reliability and stability requirements for stretching chain clamp movement. This is important for the design of the stretching system and the improvement of film stretching quality.