At present, the biggest problem faced by short-distance double-circuit parallel lines is the three-phase parameter asymmetry problem caused by non-transposition. This leads to three-phase current asymmetry, especially during heavy load performance is more prominent. Take a 750 kV double circuit parallel erection line in actual operation as an example, use EMTPE electromagnetic transient simulation software to simulate and analyze the current imbalance phenomenon. This paper studies the influence of phase sequence arrangement, distance between loops, distance between wires, line length, equivalent impedance, ground wire conditions and line power flow on current imbalance, and puts forward reasonable restraining measures. The simulation results show that when the line power flow is heavy, the double circuit lines are arranged in the same phase sequence and the distance between circuits is relatively short, there will be a large amplitude of zero sequence current on the line, mainly circulation current. If it is not suitable to adjust the protection measures, it can be considered to adjust the double-circuit lines to reverse phase sequence operation mode. The research results can provide reference for the engineering design of double-circuit parallel transmission lines.
{"title":"Analysis and treatment of current unbalance abnormal situation of 750 kV double-circuit parallel transmission line","authors":"Yadi Xie, Shan Li, Chong Wang, Dingqiang Yang","doi":"10.1051/ijmqe/2023001","DOIUrl":"https://doi.org/10.1051/ijmqe/2023001","url":null,"abstract":"At present, the biggest problem faced by short-distance double-circuit parallel lines is the three-phase parameter asymmetry problem caused by non-transposition. This leads to three-phase current asymmetry, especially during heavy load performance is more prominent. Take a 750 kV double circuit parallel erection line in actual operation as an example, use EMTPE electromagnetic transient simulation software to simulate and analyze the current imbalance phenomenon. This paper studies the influence of phase sequence arrangement, distance between loops, distance between wires, line length, equivalent impedance, ground wire conditions and line power flow on current imbalance, and puts forward reasonable restraining measures. The simulation results show that when the line power flow is heavy, the double circuit lines are arranged in the same phase sequence and the distance between circuits is relatively short, there will be a large amplitude of zero sequence current on the line, mainly circulation current. If it is not suitable to adjust the protection measures, it can be considered to adjust the double-circuit lines to reverse phase sequence operation mode. The research results can provide reference for the engineering design of double-circuit parallel transmission lines.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57886758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mengfei Xu, Chun Feng, Lijuan Zhu, Shidong Zhu, Lei He
The non-API standard series of oil country tubular goods (OCTG) have been developed rapidly to meet the increasing demand of the oil and gas fields, while the frequent accidents of non-API OCTG still occur due to the lack of a perfect quality management system. In this paper, the main types, service conditions, and the current status of quality evaluation technology of non-API OCTG at home and abroad were introduced. For the quality problems of non-API OCTG during the domestic application, the needs of the industry development needs and continuous improvement of quality management system were taken into consideration. Based on the working conditions, the quantitative evaluation method of quality grading was built by the grading idea represented by capability maturity model integration (CMMI) based on the field working conditions. And an evaluation method, including process maturity level, items, indexes and procedures, was proposed and verified. The results showed that the average value and level of quantitative evaluation results of quality grading were 81.5 and C, respectively, which was in good accordance with the current status of non-API product management. The evaluation method is more quantitative and targeted, which would provide for the completeness of the non-API product quality management system with methodological support and theoretical reference.
{"title":"Grading evaluation of non-API OCTG quality level based on working conditions","authors":"Mengfei Xu, Chun Feng, Lijuan Zhu, Shidong Zhu, Lei He","doi":"10.1051/ijmqe/2023006","DOIUrl":"https://doi.org/10.1051/ijmqe/2023006","url":null,"abstract":"The non-API standard series of oil country tubular goods (OCTG) have been developed rapidly to meet the increasing demand of the oil and gas fields, while the frequent accidents of non-API OCTG still occur due to the lack of a perfect quality management system. In this paper, the main types, service conditions, and the current status of quality evaluation technology of non-API OCTG at home and abroad were introduced. For the quality problems of non-API OCTG during the domestic application, the needs of the industry development needs and continuous improvement of quality management system were taken into consideration. Based on the working conditions, the quantitative evaluation method of quality grading was built by the grading idea represented by capability maturity model integration (CMMI) based on the field working conditions. And an evaluation method, including process maturity level, items, indexes and procedures, was proposed and verified. The results showed that the average value and level of quantitative evaluation results of quality grading were 81.5 and C, respectively, which was in good accordance with the current status of non-API product management. The evaluation method is more quantitative and targeted, which would provide for the completeness of the non-API product quality management system with methodological support and theoretical reference.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57887307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
3D surfaces based on the Archimedes' spiral are widely used in mechanical engineering, especially in the manufacturing the gear milling cutters. The machining process to create this type of surface is usually performed in specialized machines. In this study, relieving grinding process was conducted to machine the Archimedes surface of HSS P18 workpiece material using a specialized machine (1Б811) to investigate the influence of the grinding wheel graininess (G), hardness of grinding wheel (Hd), grinding wheel velocity (V), and feedrate (s) on surface quality including surface roughness (Ra) and surface hardening (ΔHRC). The experimental plan with 27 experiments (L27) was designed using the Taguchi method. Applying the analysis of variance (ANOVA), the influence of G, V, s, and Hd on Ra and ΔHRC was investigated. G, V, s, and Hd have different influences on Ra and ΔHRC in the relieving grinding process. V has the greatest influence on Ra and ΔHRC with 40.96% for Ra and 26.43% for ΔHRC. The grinding wheel hardness that has the lowest influence on Ra (0.82%), whereas the feedrate has a negligible effect on ΔHRC (7.01%). The interaction effect of the input parameters on Ra is not significant (2.91%). However, for ΔHRC, the interaction influence degree of these parameters on this criterion is quite high (33.77%). From the experimental data, Ra and ΔHRC were presented as a quadratic function of G, V, s, and Hd with high values of determination coefficient (R2 = 92.75% for Ra and R2 = 92.00% for ΔHRC). In the surveyed range of the input parameters, Ra decreases if G and V increase, and s decreases. Also in this survey range, the hardening increases if the values of the input parameters (G, V, and s) increase. This study also determined that there is no clear rule about the relationship between Ra and ΔHRC. Further studies need to be carried out to find the input optimal values ensuring the quality criteria of the relieving grinding process.
{"title":"Investigation of influence of grinding wheel and cutting parameters on surface roughness and surface hardening when relieving grinding the gear milling teeth surface based on the Archimedes' spiral","authors":"Huy Kien Nguyen, P. V. Dong, Ve Quoc Tran","doi":"10.1051/ijmqe/2022016","DOIUrl":"https://doi.org/10.1051/ijmqe/2022016","url":null,"abstract":"3D surfaces based on the Archimedes' spiral are widely used in mechanical engineering, especially in the manufacturing the gear milling cutters. The machining process to create this type of surface is usually performed in specialized machines. In this study, relieving grinding process was conducted to machine the Archimedes surface of HSS P18 workpiece material using a specialized machine (1Б811) to investigate the influence of the grinding wheel graininess (G), hardness of grinding wheel (Hd), grinding wheel velocity (V), and feedrate (s) on surface quality including surface roughness (Ra) and surface hardening (ΔHRC). The experimental plan with 27 experiments (L27) was designed using the Taguchi method. Applying the analysis of variance (ANOVA), the influence of G, V, s, and Hd on Ra and ΔHRC was investigated. G, V, s, and Hd have different influences on Ra and ΔHRC in the relieving grinding process. V has the greatest influence on Ra and ΔHRC with 40.96% for Ra and 26.43% for ΔHRC. The grinding wheel hardness that has the lowest influence on Ra (0.82%), whereas the feedrate has a negligible effect on ΔHRC (7.01%). The interaction effect of the input parameters on Ra is not significant (2.91%). However, for ΔHRC, the interaction influence degree of these parameters on this criterion is quite high (33.77%). From the experimental data, Ra and ΔHRC were presented as a quadratic function of G, V, s, and Hd with high values of determination coefficient (R2 = 92.75% for Ra and R2 = 92.00% for ΔHRC). In the surveyed range of the input parameters, Ra decreases if G and V increase, and s decreases. Also in this survey range, the hardening increases if the values of the input parameters (G, V, and s) increase. This study also determined that there is no clear rule about the relationship between Ra and ΔHRC. Further studies need to be carried out to find the input optimal values ensuring the quality criteria of the relieving grinding process.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57886659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fernando das Dores Silva, Ana Paula Margarido, Juliana Luiza de Souza Bonfim, Juliano Endrigo Sordan, Pedro Carlos Oprime
The production of ceramic tiles requires specific technical properties to allow a wide application, including covering floors and walls, building furniture, and decorative items. Current methods of measuring the dimensions of large ceramic tiles seem inadequate for products that exhibit elastic deformation due to their weight affecting the accuracy and precision of measurements. This paper aims to analyze the influence of format, thickness, and typology variables on the elastic deformation of ceramic tiles. Additionally, this study provides an analysis about which products can be measured by the traditional measurement system without compromising the quality of the results. Tests to determine warpage under different support conditions were performed using a laser-equipped coordinate measuring machine. This technology provided typology, thickness and size, and elastic deformation outcomes. In addition, a multilevel factorial design was carried out using analysis of variance (ANOVA) to investigate the influence of the selected variables. The results suggest that all the studied variables affect the elastic deformation due to the weight of ceramic tiles. The effect of interactions between predictor variables is significant mainly for the largest tiles sizes. The results also show that the current measurement method is indicated for tiles smaller than 30 × 30 cm. Further studies will be conducted to develop a new compatible and reliable method to determine the dimensional characteristics of larger ceramic tiles.
{"title":"Proposition for analysis of elastic deformation in ceramic tiles using multilevel factorial design","authors":"Fernando das Dores Silva, Ana Paula Margarido, Juliana Luiza de Souza Bonfim, Juliano Endrigo Sordan, Pedro Carlos Oprime","doi":"10.1051/ijmqe/2023014","DOIUrl":"https://doi.org/10.1051/ijmqe/2023014","url":null,"abstract":"The production of ceramic tiles requires specific technical properties to allow a wide application, including covering floors and walls, building furniture, and decorative items. Current methods of measuring the dimensions of large ceramic tiles seem inadequate for products that exhibit elastic deformation due to their weight affecting the accuracy and precision of measurements. This paper aims to analyze the influence of format, thickness, and typology variables on the elastic deformation of ceramic tiles. Additionally, this study provides an analysis about which products can be measured by the traditional measurement system without compromising the quality of the results. Tests to determine warpage under different support conditions were performed using a laser-equipped coordinate measuring machine. This technology provided typology, thickness and size, and elastic deformation outcomes. In addition, a multilevel factorial design was carried out using analysis of variance (ANOVA) to investigate the influence of the selected variables. The results suggest that all the studied variables affect the elastic deformation due to the weight of ceramic tiles. The effect of interactions between predictor variables is significant mainly for the largest tiles sizes. The results also show that the current measurement method is indicated for tiles smaller than 30 × 30 cm. Further studies will be conducted to develop a new compatible and reliable method to determine the dimensional characteristics of larger ceramic tiles.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135662189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nabil Habibi, A. Jalid, Abdelouahab Salih, Hassane Hanane
The dimensional and geometrical specifications control of a mechanical part is commonly done using a coordinate measuring machine. Collecting and processing measurement data through a probe, it allows measuring the conformity of the part according to specific tolerances. An accurate estimation of the uncertainty of measurement is critical; it is within this framework that our study is oriented; we aim to estimate the measurement uncertainty of parallelism error using the Guide to the Expression of Measurement Uncertainty (GUM), then we will proceed to a Monte Carlo simulation to compare the obtained uncertainty, we will then proceed to an inter-laboratory comparison to validate our model. Our contribution is based on a more detailed and precise estimation of the uncertainties of the measurement process taking into accounts the calibration of the machine and the propagation of uncertainties.
{"title":"Estimation of parallelism measurement uncertainty according to the Geometrical Product Specifications standard using coordinate measuring machine","authors":"Nabil Habibi, A. Jalid, Abdelouahab Salih, Hassane Hanane","doi":"10.1051/ijmqe/2023003","DOIUrl":"https://doi.org/10.1051/ijmqe/2023003","url":null,"abstract":"The dimensional and geometrical specifications control of a mechanical part is commonly done using a coordinate measuring machine. Collecting and processing measurement data through a probe, it allows measuring the conformity of the part according to specific tolerances. An accurate estimation of the uncertainty of measurement is critical; it is within this framework that our study is oriented; we aim to estimate the measurement uncertainty of parallelism error using the Guide to the Expression of Measurement Uncertainty (GUM), then we will proceed to a Monte Carlo simulation to compare the obtained uncertainty, we will then proceed to an inter-laboratory comparison to validate our model. Our contribution is based on a more detailed and precise estimation of the uncertainties of the measurement process taking into accounts the calibration of the machine and the propagation of uncertainties.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57886810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The layout of measurement points is the key to the efficient inspection of free-form surfaces. Two algorithms are proposed for the layout of free-form surface measurement points: the free-form surface Gaussian curvature variation grid method and the isoparametric line curvature variation grid method. The former first divides the free-form surface into a uniform grid, determines the number of measurement points for each grid based on the change in the Gaussian curvature of each grid, and selects points within each grid based on a uniform distribution of the Gaussian curvature. The latter is achieved by first taking points from the curvature change on the initial U- and V-direction isoparametric lines, generating isoparametric lines from the points to divide the free-form surface into a grid, and selecting the grid intersections as measurement points. The effectiveness of the algorithm was verified by designing free-form surfaces, performing coordinate measuring machine (CMM) measurement experiments, and comparing the results with those of existing algorithms.
{"title":"Measurement point layout strategy of free-form surface based on gridding using coordinate measuring machine","authors":"Linan Zeng, Yueping Chen","doi":"10.1051/ijmqe/2023008","DOIUrl":"https://doi.org/10.1051/ijmqe/2023008","url":null,"abstract":"The layout of measurement points is the key to the efficient inspection of free-form surfaces. Two algorithms are proposed for the layout of free-form surface measurement points: the free-form surface Gaussian curvature variation grid method and the isoparametric line curvature variation grid method. The former first divides the free-form surface into a uniform grid, determines the number of measurement points for each grid based on the change in the Gaussian curvature of each grid, and selects points within each grid based on a uniform distribution of the Gaussian curvature. The latter is achieved by first taking points from the curvature change on the initial U- and V-direction isoparametric lines, generating isoparametric lines from the points to divide the free-form surface into a grid, and selecting the grid intersections as measurement points. The effectiveness of the algorithm was verified by designing free-form surfaces, performing coordinate measuring machine (CMM) measurement experiments, and comparing the results with those of existing algorithms.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57886859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nabil Habibi, A. Jalid, Abdelouahab Salih, M. Z. Es-sadek
The validation of the conformity of parts according to the ISO 98-4 standard, cannot be achieved without an accurate estimation of the measurement uncertainty, which can become difficult when it comes to a complex measurement strategy to control a geometrical specification of a mechanical part using a Coordinate Measuring Machine (CMM). The purpose of the study in this paper is to analyze the measurement strategy following the Geometric Product Specification (GPS) Standard, to estimate the associated uncertainty of the different parameters of each step, to be able to achieve the uncertainty of the measurement of a given specification (perpendicularity error in our study) using the Guide to the expression of uncertainty in measurement (GUM). This uncertainty will be thereafter validated by a Monte Carlo simulation, and an interlaboratory comparison will be conducted to compare the obtained results according to the ISO 13528 standard. Our contribution is based on a more accurate estimation of the measurement strategy's parameters uncertainties. This approach can also be used by accredited calibration laboratories (ISO 17025) or in the general case in the control of perpendicularity specification of mechanical parts using a coordinate measuring machine. A case study has been conducted, controlling a perpendicularity specification with a tolerance limit of 15 µm, after the calibration of the CMM to obtain the variance-covariance matrices. The mechanical part perpendicularity error (12.55 µm) was below the limit, however, was judged “not conform” when considering the estimated uncertainty (4.06 µm) and the interlaboratory comparison was satisfactory despite the difference of the acceptance criterion.
{"title":"Perpendicularity assessment and uncertainty estimation using coordinate measuring machine","authors":"Nabil Habibi, A. Jalid, Abdelouahab Salih, M. Z. Es-sadek","doi":"10.1051/ijmqe/2023010","DOIUrl":"https://doi.org/10.1051/ijmqe/2023010","url":null,"abstract":"The validation of the conformity of parts according to the ISO 98-4 standard, cannot be achieved without an accurate estimation of the measurement uncertainty, which can become difficult when it comes to a complex measurement strategy to control a geometrical specification of a mechanical part using a Coordinate Measuring Machine (CMM). The purpose of the study in this paper is to analyze the measurement strategy following the Geometric Product Specification (GPS) Standard, to estimate the associated uncertainty of the different parameters of each step, to be able to achieve the uncertainty of the measurement of a given specification (perpendicularity error in our study) using the Guide to the expression of uncertainty in measurement (GUM). This uncertainty will be thereafter validated by a Monte Carlo simulation, and an interlaboratory comparison will be conducted to compare the obtained results according to the ISO 13528 standard. Our contribution is based on a more accurate estimation of the measurement strategy's parameters uncertainties. This approach can also be used by accredited calibration laboratories (ISO 17025) or in the general case in the control of perpendicularity specification of mechanical parts using a coordinate measuring machine. A case study has been conducted, controlling a perpendicularity specification with a tolerance limit of 15 µm, after the calibration of the CMM to obtain the variance-covariance matrices. The mechanical part perpendicularity error (12.55 µm) was below the limit, however, was judged “not conform” when considering the estimated uncertainty (4.06 µm) and the interlaboratory comparison was satisfactory despite the difference of the acceptance criterion.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57886889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The teaching workload of university teachers is an objective reflection of their instructional input and directly affects the quality of education and teaching. The ultimate goal of studying university teachers' workload is to enhance the quality of higher education. Based on the analysis of data from twelve years' teaching workload of a teaching-research university in China, the results show that the changes of overall teaching workload are in stages. Classroom teaching workload is the majority of the whole teaching workload. The teaching workload is mainly undertaken by university teachers with intermediate and deputy senior professional titles, and changes in teaching workload undertaken by university teachers with junior professional title and intermediate professional title is greater than those with vice senior professional title and senior professional title. Male teachers' workload is slightly more than female teachers, but gender differences have been shrinking over the years. The proportion of classroom teaching workload in teaching-oriented colleges is high, which is about 7:3 and has decreased in the past twelve years. Developing logic, administrative logic and difference logic are generative logic of changes in undergraduate teaching workload. Due to the relevance of the ISO 9000 family of standards in the management of higher education teaching, it is recommended to follow its seven quality management principles and adopt a teaching quality management approach based on the PDCA cycle in a broader context of quality management. This approach aims to manage higher education systematically, establish an organizational environment, and promote teachers' active engagement in teaching, including teaching workload. It also facilitates to improve teacher classification management and evaluation mechanisms.
{"title":"Changes in workload of Chinese university undergraduate teaching from the perspective of education quality management: A case study of a teaching-research university","authors":"Lizhi Sun, Danhui Chen, Jingjing Xu","doi":"10.1051/ijmqe/2023012","DOIUrl":"https://doi.org/10.1051/ijmqe/2023012","url":null,"abstract":"The teaching workload of university teachers is an objective reflection of their instructional input and directly affects the quality of education and teaching. The ultimate goal of studying university teachers' workload is to enhance the quality of higher education. Based on the analysis of data from twelve years' teaching workload of a teaching-research university in China, the results show that the changes of overall teaching workload are in stages. Classroom teaching workload is the majority of the whole teaching workload. The teaching workload is mainly undertaken by university teachers with intermediate and deputy senior professional titles, and changes in teaching workload undertaken by university teachers with junior professional title and intermediate professional title is greater than those with vice senior professional title and senior professional title. Male teachers' workload is slightly more than female teachers, but gender differences have been shrinking over the years. The proportion of classroom teaching workload in teaching-oriented colleges is high, which is about 7:3 and has decreased in the past twelve years. Developing logic, administrative logic and difference logic are generative logic of changes in undergraduate teaching workload. Due to the relevance of the ISO 9000 family of standards in the management of higher education teaching, it is recommended to follow its seven quality management principles and adopt a teaching quality management approach based on the PDCA cycle in a broader context of quality management. This approach aims to manage higher education systematically, establish an organizational environment, and promote teachers' active engagement in teaching, including teaching workload. It also facilitates to improve teacher classification management and evaluation mechanisms.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57886970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper proposes a novel environmental energy harvesting process. The source of energy consists of the electromagnetic (EM) noise emitted by the frequency converter system (inverter) and the harvester is composed by a monopole antenna and a full rectifier circuit. The operation of the frequency converter using MOSFET and IGBT switchers produces parasite currents in high frequency (100 KHz to 30 MHz) which are the principal cause of radiated EM noise. We have demonstrated that we can convert this EM noise into useful electrical energy to power wireless sensor nodes (WSNs) and other electronic devices. Experimentally, the EM noise is produced when the system “frequency converter + charge” is in operation mode. Moreover, the harvester has produced an uninterrupted power of 40 mW measured in accredited ISO/IEC 17025 laboratory. Furthermore, we have presented the output power of our device stored in 1 µF capacitor with demonstration examples of loading charges. These results offer opportunities for self-powered WSNs and electronic devices on a very large area of industrial applications with less use of conventional batteries.
{"title":"First study on harvesting electromagnetic noise energy generated by the frequency converters","authors":"M. H. Raouadi, J. Fanton, O. Touayar","doi":"10.1051/ijmqe/2023004","DOIUrl":"https://doi.org/10.1051/ijmqe/2023004","url":null,"abstract":"This paper proposes a novel environmental energy harvesting process. The source of energy consists of the electromagnetic (EM) noise emitted by the frequency converter system (inverter) and the harvester is composed by a monopole antenna and a full rectifier circuit. The operation of the frequency converter using MOSFET and IGBT switchers produces parasite currents in high frequency (100 KHz to 30 MHz) which are the principal cause of radiated EM noise. We have demonstrated that we can convert this EM noise into useful electrical energy to power wireless sensor nodes (WSNs) and other electronic devices. Experimentally, the EM noise is produced when the system “frequency converter + charge” is in operation mode. Moreover, the harvester has produced an uninterrupted power of 40 mW measured in accredited ISO/IEC 17025 laboratory. Furthermore, we have presented the output power of our device stored in 1 µF capacitor with demonstration examples of loading charges. These results offer opportunities for self-powered WSNs and electronic devices on a very large area of industrial applications with less use of conventional batteries.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57886819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiaqi Xu, Qiang Wang, Juan Zhou, Haiting Zhou, Jiayan Chen
To solve the problem of fault prediction and diagnosis of household air conditioning, an improved Bayesian network (BN) fault diagnosis model is proposed. Firstly, the orthogonal defect classification (ODC) is used to make statistics and analysis of air conditioning fault data, and the structure of BN fault diagnosis model is built based on the analysis results. Then, genetic algorithm (GA) is used to optimize the conditional probability of network nodes and determine the network parameters. Finally, the cooling and heating failure data of household air conditioning were taken as an example to diagnose. Compared with the traditional BN model, the accuracy of fault diagnosis increases from 81.13% to 92.83%, which verifies the effectiveness of the model.
{"title":"Improved Bayesian network-based for fault diagnosis of air conditioner system","authors":"Jiaqi Xu, Qiang Wang, Juan Zhou, Haiting Zhou, Jiayan Chen","doi":"10.1051/ijmqe/2023009","DOIUrl":"https://doi.org/10.1051/ijmqe/2023009","url":null,"abstract":"To solve the problem of fault prediction and diagnosis of household air conditioning, an improved Bayesian network (BN) fault diagnosis model is proposed. Firstly, the orthogonal defect classification (ODC) is used to make statistics and analysis of air conditioning fault data, and the structure of BN fault diagnosis model is built based on the analysis results. Then, genetic algorithm (GA) is used to optimize the conditional probability of network nodes and determine the network parameters. Finally, the cooling and heating failure data of household air conditioning were taken as an example to diagnose. Compared with the traditional BN model, the accuracy of fault diagnosis increases from 81.13% to 92.83%, which verifies the effectiveness of the model.","PeriodicalId":38371,"journal":{"name":"International Journal of Metrology and Quality Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57886876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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