Fast bearing fault diagnosis of rolling element using Lévy Moth-Flame optimization algorithm and Naive Bayes

Sun, Songlin; Przystupa, Krzysztof; Wei, Ming; Han, Yu; Ye, Zhiwei; Кочан, Орест

doi:10.17531/ein.2020.4.17

Cited by 45 publications

(32 citation statements)

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“…[25,26]. Reliability for the mechanical strength of materials was discussed in papers [27,28]. M. Warszyński [29] defines the reliability of an object or element as its ability to carry loads under specified conditions and over specified time periods while maintaining its required strength.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Strength Reliability of Impregnated Wood after High Temperature Conditions

et al. 2020

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The paper presents the results of the research into the impact of impregnation of wood on its bending strength and elastic modulus under normal conditions and after thermal treatment and investigates its structural reliability. Pinewood, non-impregnated and pressure impregnated with a solution with SiO2 nanoparticles, was used in this research. The use of nanoparticles decreases the flammability of timber among others. Some of the tested samples were treated at 250 °C. This temperature corresponds to the boundary of the self-ignition of wood. This elevated temperature was assumed to be reached by a given speed of heating within 10 min, and then the samples were stored in these conditions for 10 and 20 min. The tests demonstrate that the bending strength of the impregnated wood was slightly improved, the impregnation did not impact the elastic modulus of the material in all such conditions, and the residual strength decreased less for the wood impregnated after being exposed to the elevated temperatures. The reliability analysis proves a positive effect of impregnation with a solution with SiO2 on the durability of wood, both after being exposed to normal and elevated temperatures. The distribution of the failure rates indicates a more intensive degradation of non-impregnated wood. The distribution of the survival function demonstrates a more probable non-destruction of impregnated wood after elevated temperature conditions.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Strength Reliability of Impregnated Wood after High Temperature Conditions

et al. 2020

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“…Therefore, this property should be taken into account by the orthodontist as the biomechanical effect of the apparatus may be affected. (4) It seems that among the tested materials, the material 2A, of which orthodontic plates are made, can be used for applications in which stresses caused by long-term biomechanical loads should be less than 20 MPa.…”

Section: Discussionmentioning

confidence: 99%

“…The functional properties of polymeric materials, including mechanical properties and their experimental assessment have become an important area of research in the field of material engineering [1][2][3][4]. The growing interest is due to the increasing use of polymers in industrial production as well as medical devices [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

et al. 2020

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This paper discusses the issues of strength and creep of polymeric materials used in orthodontic appliances. Orthodontic biomechanics is focused on the movement of individual teeth or dental groups as a result of the force applied by orthodontic appliances. Stresses in the construction of functional and biomechanical appliances is generated when using the apparatus in the oral cavity. The orthodontic appliance must maintain its shape and not be damaged during treatment so strength and creep resistance are fundamental properties. It was assumed that the clinical success of orthodontic appliances can be determined by these performance properties. The aim of the work was the experimental assessment of comparative bending strength and creep resistance of selected popular polymer materials used in the production of biomechanical orthodontic appliances. Four commercial materials manufactured by the world class producers were tested: NextDent Ortho Rigid (Vertex-Dental B.V., Soesterberg, The Netherlands) marked as “1A”; Erkocryl (ERKODENT Erich Kopp GmbH, Pfalzgrafenweiler, Germany)-“2A”; Vertex Orthoplast (Vertex Dental B.V.), blue, marked as “3A” and material with the same name as “3A” but orange, marked in the article as “4A”. All the tests were carried out after aging in artificial saliva for 48 h at a temperature of 37 °C. Flexular strength and flexular modulus were made using the three point bending method according to the ISO 178 technical standard. Creep tests were carried out according to the method contained in ISO 899-2. The creep test was carried out in an artificial saliva bath at 37 °C. The creep tests showed significant differences in the strength, modulus and deformability of the tested materials. The strength reliability of the tested materials also varied. The research shows that the 2A material can be used for orthodontic applications in which long-term stresses should be lower than 20 MPa.

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“…The research work on object detection algorithms has experienced the transition from traditional algorithms to deep learning ones [24]. The traditional object detection methods, such as the algorithm of fast multi-feature pedestrian detection based on the histogram of an oriented gradient (HOG) using discrete wavelet transform proposed by Gwang-Soo Hong [25], and distinctive image features from scale-invariant key points proposed by Lowe D. [26], etc.…”

Section: Methodsmentioning

confidence: 99%

Examination of Abnormal Behavior Detection Based on Improved YOLOv3

et al. 2021

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Examination is a way to select talents, and a perfect invigilation strategy can improve the fairness of the examination. To realize the automatic detection of abnormal behavior in the examination room, the method based on the improved YOLOv3 (The third version of the You Only Look Once algorithm) algorithm is proposed. The YOLOv3 algorithm is improved by using the K-Means algorithm, GIoUloss, focal loss, and Darknet32. In addition, the frame-alternate dual-thread method is used to optimize the detection process. The research results show that the improved YOLOv3 algorithm can improve both the detection accuracy and detection speed. The frame-alternate dual-thread method can greatly increase the detection speed. The mean Average Precision (mAP) of the improved YOLOv3 algorithm on the test set reached 88.53%, and the detection speed reached 42 Frames Per Second (FPS) in the frame-alternate dual-thread detection method. The research results provide a certain reference for automated invigilation.

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Fast bearing fault diagnosis of rolling element using Lévy Moth-Flame optimization algorithm and Naive Bayes

Cited by 45 publications

References 50 publications

Mechanical Properties and Strength Reliability of Impregnated Wood after High Temperature Conditions

Mechanical Properties and Strength Reliability of Impregnated Wood after High Temperature Conditions

Bending Behaviour of Polymeric Materials Used on Biomechanics Orthodontic Appliances

Examination of Abnormal Behavior Detection Based on Improved YOLOv3

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