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2. Fruit classification system based on the pressure sensor coupled with support vector machine

Author

WANG Feifei, LIU Peng, SUN Fengwei, and ZHOU Qiong

Subjects
pressure sensor, support vector machine, gaussian kernel function, fruit, classification, sorting manipulator, Food processing and manufacture, TP368-456
Abstract

Objective: To improve fruit classification accuracy while considering low computational cost and low sensor cost. Methods: A fruit classification system based on capacitive pressure sensor was proposed. The system used support vector machine algorithm with a Gaussian kernel function (GKF-SVM) to classify fruits. The capacitive pressure sensors used were made of thin copper sheets and a layer of vinyl acetate, and these sensors were fixed to the thumb and index finger of a polyamide spandex glove that simulates a robotic hand. The obtained capacitance value was expressed in the form of digital level, and the data was extracted by data processing software, and the capacitance data was processed by SVM algorithm with kernel functions to determine the category of a fruit. Results: The classification results of 11 kinds of fruits in the designed classification system shown that the smart glove using GKF-SVM algorithm could achieve high accuracy classification of fruits, which could trade off between classification accuracy, calculation cost and low sensor cost according to actual fruit classification needs. Conclusion: The research results can be used to develop electronic systems for fruit classification to improve the fruit classification performance of classification manipulators.

Published
2023
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7. Stability Analysis of Surrounding Rock and Initial Support of Tunnel Undercrossing Multi-Situational Goafs: A Reference of Construction Guidance.

Author

Zhao, Meng, Guo, Jiaqi, Li, Shaohua, Liang, Shifan, and Sun, Fengwei

Subjects
HIGH speed trains, FINITE differences, DISPLACEMENT (Psychology), ROCK deformation, TUNNELS
Abstract

To ensure the construction and operational safety of tunnel undercrossing multi-situational goafs, the Huaying Mountain High-Speed Rail Tunnel, a critical section of the Xi'an-Chongqing High-Speed Railway, was taken as a case study. Based on a three-dimensional finite difference numerical simulation platform, twelve situations were established to analyze the effects of three factors: distance, scale, and angle. The stability analysis was conducted by examining the displacement and deformation characteristics of the surrounding rock, stress changes, and axial forces of the initial support for each situation. The results show that in tunnel undercrossing multi-situational goafs, the vertical deformation, horizontal convergence of the surrounding rock, and the maximum axial force of initial support are all affected. Within a certain range, changes in distance significantly impact subsidence and settlement deformation of the surrounding rock. However, as the distance increases, the horizontal and vertical displacements of the tunnel and the axial force of the initial support tend to decrease. Conversely, the scale and angle of the goaf have an opposite effect on the surrounding rock: as the scale and angle increase, the stability of the surrounding rock deteriorates. In this case study, when the distance exceeds 1.13 times the tunnel span, the influence of the goaf on the stability of the surrounding rock gradually decreases. When the angle exceeds 45°, vertical displacement decreases, and the increasing trend of horizontal displacement gradually diminishes. The conclusions of this paper can provide guidance for designing reinforcement schemes for tunnels crossing through multi-situational goafs. The findings provide valuable insights and guidance for similar engineering projects. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Research on Partial Discharge Detection methods for Electrical Equipment Diagnosis

Author

Liu Ren, Jinglong Mu, Pin Lv, Xie Xinnan, Liu Bo, Sun Fengwei, Bo Zhang, Wu Shaoyong, Zhu Bo, Qingguo Meng, and Zhang Fuliang

Subjects
Engineering, business.industry, Electrical engineering, Testing equipment, Troubleshooting, Fault (power engineering), Transient voltage suppressor, Fault detection and isolation, Switchgear, Reliability engineering, Electrical equipment, Partial discharge, business, human activities
Abstract

Switchgear charged for fault detection, principles and methods the live test from switchgear partial discharge, analyzes the use of ultrasonic detection assays and transient voltage for the switchgear cabinet feasibility of fault diagnosis; using a combination of switchgear partial discharge founding live testing equipment failure cases, by power testing experimental analysis confirmed the presence of switchgear failure to verify the validity of partial discharge detection in live test switchgear fault diagnosis.

Published
2016

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