Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9612793
W. Wen
With the development of Internet, mobile Internet, artificial intelligence, and other information technology, “Internet + education” is profoundly affecting the reform and connotation of higher education, information-based teaching is bound to become the general direction of China’s teaching reform. Universities are important bases for training talents, and the key to improving the quality of education is to improve the quality of teaching. The rapid development of modern information technology has had a profound impact on the curriculum reform of universities. In this paper, in order to further improve the quality of mixed online teaching mode as the goal, to select part of the teachers and students in colleges and universities as the research object, the key links in implementing mixture with online teaching mode in-depth research and analysis on the teaching pattern of the popularity and identity, found that the factors influencing the quality of online teaching, puts forward the effective method to improve the teaching quality of online mixing. At the same time, the research data were analyzed and summarized, and the main problems and Suggestions were put forward, hoping to play a positive role in promoting the reform of online education and teaching under the background of the Internet.
{"title":"The Factors Affecting the Quality of Teaching on the Internet Background","authors":"W. Wen","doi":"10.1109/PHM-Nanjing52125.2021.9612793","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9612793","url":null,"abstract":"With the development of Internet, mobile Internet, artificial intelligence, and other information technology, “Internet + education” is profoundly affecting the reform and connotation of higher education, information-based teaching is bound to become the general direction of China’s teaching reform. Universities are important bases for training talents, and the key to improving the quality of education is to improve the quality of teaching. The rapid development of modern information technology has had a profound impact on the curriculum reform of universities. In this paper, in order to further improve the quality of mixed online teaching mode as the goal, to select part of the teachers and students in colleges and universities as the research object, the key links in implementing mixture with online teaching mode in-depth research and analysis on the teaching pattern of the popularity and identity, found that the factors influencing the quality of online teaching, puts forward the effective method to improve the teaching quality of online mixing. At the same time, the research data were analyzed and summarized, and the main problems and Suggestions were put forward, hoping to play a positive role in promoting the reform of online education and teaching under the background of the Internet.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115236419","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9612662
Xu He, Bo Li, Tao Hong
As the heart of drilling engineering, drilling pump affects drilling engineering. Because of its working environment and nature, it is prone to failure. In order to avoid the decrease of work efficiency and the increase of cost caused by faults, it is necessary to diagnose faults quickly and accurately. At present, the traditional method of drilling pump fault diagnosis is fault tree analysis. However, the fault tree cannot represent the fault of a certain part of the drilling pump in a fixed order, resulting in inaccurate diagnosis results. Therefore, dynamic logic gate is introduced and dynamic fault tree is established to solve the dynamic problem of drilling pump fault. To improve the reliability and accuracy of the diagnosis results, the dynamic fault tree diagnosis model is studied and improved. Taking the hydraulic end of drilling pump as an example, the diagnosis results are consistent with the actual situation, which proves the effectiveness of the improved algorithm.
{"title":"A Fault Diagnosis Method For Hydraulic End Of Drilling Pump Based On Dynamic Fault Tree","authors":"Xu He, Bo Li, Tao Hong","doi":"10.1109/PHM-Nanjing52125.2021.9612662","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9612662","url":null,"abstract":"As the heart of drilling engineering, drilling pump affects drilling engineering. Because of its working environment and nature, it is prone to failure. In order to avoid the decrease of work efficiency and the increase of cost caused by faults, it is necessary to diagnose faults quickly and accurately. At present, the traditional method of drilling pump fault diagnosis is fault tree analysis. However, the fault tree cannot represent the fault of a certain part of the drilling pump in a fixed order, resulting in inaccurate diagnosis results. Therefore, dynamic logic gate is introduced and dynamic fault tree is established to solve the dynamic problem of drilling pump fault. To improve the reliability and accuracy of the diagnosis results, the dynamic fault tree diagnosis model is studied and improved. Taking the hydraulic end of drilling pump as an example, the diagnosis results are consistent with the actual situation, which proves the effectiveness of the improved algorithm.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115297335","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9613083
Qiang Chen
The traditional foundation settlement prediction method of high-rise buildings cannot achieve average distribution in the distribution of unit weight ratio, resulting in poor accuracy of foundation settlement prediction calculation. In order to improve the prediction accuracy, a foundation settlement prediction method of high-rise buildings based on GPS baseline solution is proposed. The expression of three-phase system composed of soil particles, pore water and pore gas is constructed, and the variation trend of density pressure between foundation surface water and soil is analyzed; Based on the GPS baseline solution, the unit weight ratio is allocated to improve the detection accuracy of cycle slip, accurately calculate the ionospheric residuals before and after epochs, reset the proportion and redistribute the weight of a posteriori variance component estimation; The Poisson curve expression is established to calculate the main consolidation settlement of high-rise buildings, and the foundation settlement prediction model is established. A comparative experiment is designed to test the accuracy of the three prediction methods. In the prediction test of untreated foundation settlement and the prediction test of foundation settlement after filling treatment, the algorithm is better than the other two algorithms. It can be seen that the prediction result of GPS baseline solution algorithm is more accurate.
{"title":"Prediction method of high-rise building foundation settlement based on GPS Baseline Solution","authors":"Qiang Chen","doi":"10.1109/PHM-Nanjing52125.2021.9613083","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9613083","url":null,"abstract":"The traditional foundation settlement prediction method of high-rise buildings cannot achieve average distribution in the distribution of unit weight ratio, resulting in poor accuracy of foundation settlement prediction calculation. In order to improve the prediction accuracy, a foundation settlement prediction method of high-rise buildings based on GPS baseline solution is proposed. The expression of three-phase system composed of soil particles, pore water and pore gas is constructed, and the variation trend of density pressure between foundation surface water and soil is analyzed; Based on the GPS baseline solution, the unit weight ratio is allocated to improve the detection accuracy of cycle slip, accurately calculate the ionospheric residuals before and after epochs, reset the proportion and redistribute the weight of a posteriori variance component estimation; The Poisson curve expression is established to calculate the main consolidation settlement of high-rise buildings, and the foundation settlement prediction model is established. A comparative experiment is designed to test the accuracy of the three prediction methods. In the prediction test of untreated foundation settlement and the prediction test of foundation settlement after filling treatment, the algorithm is better than the other two algorithms. It can be seen that the prediction result of GPS baseline solution algorithm is more accurate.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114655602","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9612898
Xing Guanghua, GU Xin, S. Yan, Zhang Ping
The Onboard Maintenance System (OMS) is key system to implement the Prognostics and Health Management (PHM) technology in the transport category airplane. Integrated Modular Avionics (IMA) and Avionics Full Duplex Switched Ethernet (AFDX) with the faster data exchange is utilized in the newly developed aircraft. This paper briefly introduces the system function and architecture of IMA-based OMS. The airworthiness certification requirement of Part 25 and Special Condition are systemically analyzed. The approaches and some key technology concerns of airworthiness certification for IMA-based OMS installed on transport category airplane are discussed in detail, which can be used as reference for aviation industry to achieve the airworthiness certification.
{"title":"Airworthiness Certification of IMA-based OMS on Transport Category Airplane","authors":"Xing Guanghua, GU Xin, S. Yan, Zhang Ping","doi":"10.1109/PHM-Nanjing52125.2021.9612898","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9612898","url":null,"abstract":"The Onboard Maintenance System (OMS) is key system to implement the Prognostics and Health Management (PHM) technology in the transport category airplane. Integrated Modular Avionics (IMA) and Avionics Full Duplex Switched Ethernet (AFDX) with the faster data exchange is utilized in the newly developed aircraft. This paper briefly introduces the system function and architecture of IMA-based OMS. The airworthiness certification requirement of Part 25 and Special Condition are systemically analyzed. The approaches and some key technology concerns of airworthiness certification for IMA-based OMS installed on transport category airplane are discussed in detail, which can be used as reference for aviation industry to achieve the airworthiness certification.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116642810","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9613042
Fang Hu, Xin Su, Shouqing Huang, Zhiwei Lv, Yanan Wang
In view of the demand for explosion decompression test of aviation and plateau electronic products and the immature test technology at home and abroad, the explosion decompression test technology is studied, and the test scheme of nesting low-pressure chamber and atmospheric chamber is put forward. Based on the experimental scheme, the theory of compressible gas isentropic flow and RNG-k-$varepsilon$ The turbulence model establishes the transient mathematical model of explosion decompression, studies the influencing factors of decompression time, carries out explosion decompression simulation analysis based on ANSYS Workbench platform, and quantitatively analyzes the influencing factors. The simulation results show that reducing the initial pressure of the low-pressure chamber can effectively reduce the decompression time. When the initial pressure drops to 10kPa and below, the decompression time is about 70ms. The lag time of the pressure change at the monitoring point compared with the pressure change at the product placement point accounts for about 15% of the total decompression time. Combined with the simulation and test data, a scheme optimization method is proposed. The design pressure drop area falls within 90% of the total pressure drop area, which can make the decompression time meet the requirements of explosion decompression test.
{"title":"Modeling and simulation of explosive decompression test for units and decompression time analysis","authors":"Fang Hu, Xin Su, Shouqing Huang, Zhiwei Lv, Yanan Wang","doi":"10.1109/PHM-Nanjing52125.2021.9613042","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9613042","url":null,"abstract":"In view of the demand for explosion decompression test of aviation and plateau electronic products and the immature test technology at home and abroad, the explosion decompression test technology is studied, and the test scheme of nesting low-pressure chamber and atmospheric chamber is put forward. Based on the experimental scheme, the theory of compressible gas isentropic flow and RNG-k-$varepsilon$ The turbulence model establishes the transient mathematical model of explosion decompression, studies the influencing factors of decompression time, carries out explosion decompression simulation analysis based on ANSYS Workbench platform, and quantitatively analyzes the influencing factors. The simulation results show that reducing the initial pressure of the low-pressure chamber can effectively reduce the decompression time. When the initial pressure drops to 10kPa and below, the decompression time is about 70ms. The lag time of the pressure change at the monitoring point compared with the pressure change at the product placement point accounts for about 15% of the total decompression time. Combined with the simulation and test data, a scheme optimization method is proposed. The design pressure drop area falls within 90% of the total pressure drop area, which can make the decompression time meet the requirements of explosion decompression test.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116961141","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9612914
Yang Ji, Chang-yuan Chen, Li-fan Huang
The current construction carbon emission control methods mainly focus on the construction stage of the project as the research object, which can not control the carbon emission of each link in the construction, resulting in the carbon emission control effect is not ideal. Therefore, in order to achieve the goal of emission reduction, design the carbon emission control method of construction based on the whole life cycle. According to the life cycle theory, the energy consumption data of construction link is collected, and the carbon emission prediction model of construction is constructed. According to the prediction results, carbon emission control schemes and measures are selected. So far, the design of carbon emission control method based on the whole life cycle of construction is completed. Experiments show that this method can effectively reduce the carbon emissions in construction and promote the green development of construction.
{"title":"Research on Carbon Emission Control Method of Construction Based on Whole Life Cycle","authors":"Yang Ji, Chang-yuan Chen, Li-fan Huang","doi":"10.1109/PHM-Nanjing52125.2021.9612914","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9612914","url":null,"abstract":"The current construction carbon emission control methods mainly focus on the construction stage of the project as the research object, which can not control the carbon emission of each link in the construction, resulting in the carbon emission control effect is not ideal. Therefore, in order to achieve the goal of emission reduction, design the carbon emission control method of construction based on the whole life cycle. According to the life cycle theory, the energy consumption data of construction link is collected, and the carbon emission prediction model of construction is constructed. According to the prediction results, carbon emission control schemes and measures are selected. So far, the design of carbon emission control method based on the whole life cycle of construction is completed. Experiments show that this method can effectively reduce the carbon emissions in construction and promote the green development of construction.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117344680","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9613100
Han Ming, Liu Han
In order to solve the problem that the current vision system produces motion blur during imaging, a fast enhancement method for motion blur images based on improved deep learning is proposed. By detecting the contour of the motion blur image target, the Wiener filtering restoration model is established, combined with the improved deep learning method to decompose the gray tone function, and the BNL-Means algorithm is used to calculate the similarity between high-frequency image blocks to improve the accuracy of spatial image feature extraction. Realize the enhancement of motion blurred images. Compared with the existing methods, it is proved by experiments that the accuracy of the fuzzy kernel estimation of the design method reaches 95.63%, which is higher than the comparison of the three literature methods. The method has a better effect of enhancing the motion blur image and has strong practicability.
{"title":"Research on Fast Enhancement of Motion Blurred Image Based on Improved Deep Learning","authors":"Han Ming, Liu Han","doi":"10.1109/PHM-Nanjing52125.2021.9613100","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9613100","url":null,"abstract":"In order to solve the problem that the current vision system produces motion blur during imaging, a fast enhancement method for motion blur images based on improved deep learning is proposed. By detecting the contour of the motion blur image target, the Wiener filtering restoration model is established, combined with the improved deep learning method to decompose the gray tone function, and the BNL-Means algorithm is used to calculate the similarity between high-frequency image blocks to improve the accuracy of spatial image feature extraction. Realize the enhancement of motion blurred images. Compared with the existing methods, it is proved by experiments that the accuracy of the fuzzy kernel estimation of the design method reaches 95.63%, which is higher than the comparison of the three literature methods. The method has a better effect of enhancing the motion blur image and has strong practicability.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124836591","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9612753
Xin Li, Hongfu Zuo, Pengcheng Hao, Ya Su, Haoyue Liu, Cheng Xue
Early fault detection and prognostics and health management (PHM) are of importance in the gear transmission system. Most of the existing fault detection methods rarely considered the influence of load variation. A novel gear fault detection scheme based on time synchronous averaging (TSA) and vector autoregressive (VAR) is proposed, which enables to implement early fault detection of a gearbox under varying load. Six time series models are established for different load conditions. The gear residual signal is selected to reduce the interference of variable conditions to real signals. The root mean square, variance and kurtosis are used to analyze the degradation trend of the gearbox. The results show that the proposed method can detect the abnormal condition of the gearbox 35 flies ahead of the traditional method, which verifies the effectiveness of the proposed approach.
{"title":"Early Fault Detection of Gearbox Using TSA and VAR Model Considering Load Variation","authors":"Xin Li, Hongfu Zuo, Pengcheng Hao, Ya Su, Haoyue Liu, Cheng Xue","doi":"10.1109/PHM-Nanjing52125.2021.9612753","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9612753","url":null,"abstract":"Early fault detection and prognostics and health management (PHM) are of importance in the gear transmission system. Most of the existing fault detection methods rarely considered the influence of load variation. A novel gear fault detection scheme based on time synchronous averaging (TSA) and vector autoregressive (VAR) is proposed, which enables to implement early fault detection of a gearbox under varying load. Six time series models are established for different load conditions. The gear residual signal is selected to reduce the interference of variable conditions to real signals. The root mean square, variance and kurtosis are used to analyze the degradation trend of the gearbox. The results show that the proposed method can detect the abnormal condition of the gearbox 35 flies ahead of the traditional method, which verifies the effectiveness of the proposed approach.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115450836","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9612947
Yifei Wang, C. Su, Mingjiang Xie
Pipeline corrosion is a serious problem in the oil industry at present. It can lead to small leakage, burst and unstable fracture of pipeline. Therefore, it is necessary to use inspection and maintenance methods to prevent pipeline failure. In this context, this study discusses the optimal inspection and maintenance planning of corroded pipelines under external metal loss corrosion. Firstly, the limit state functions of different failure modes are established, and the corresponding failure probability is obtained by Monte Carlo simulation. The service age reduction factor is introduced to represent the maintenance effect of imperfect maintenance, and it is used to update the failure rate and failure probability. Genetic algorithm is applied to optimize the inspection plan. Finally, an example is given to verify the effectiveness of the proposed method.
{"title":"Optimal inspection and maintenance plans for corroded pipelines","authors":"Yifei Wang, C. Su, Mingjiang Xie","doi":"10.1109/PHM-Nanjing52125.2021.9612947","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9612947","url":null,"abstract":"Pipeline corrosion is a serious problem in the oil industry at present. It can lead to small leakage, burst and unstable fracture of pipeline. Therefore, it is necessary to use inspection and maintenance methods to prevent pipeline failure. In this context, this study discusses the optimal inspection and maintenance planning of corroded pipelines under external metal loss corrosion. Firstly, the limit state functions of different failure modes are established, and the corresponding failure probability is obtained by Monte Carlo simulation. The service age reduction factor is introduced to represent the maintenance effect of imperfect maintenance, and it is used to update the failure rate and failure probability. Genetic algorithm is applied to optimize the inspection plan. Finally, an example is given to verify the effectiveness of the proposed method.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"314 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116359541","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}
Pub Date : 2021-10-15DOI: 10.1109/PHM-Nanjing52125.2021.9613037
Xiao Yunxian, Zhang Chao
Vibration induced fatigue is one of the main forms of structural failure. Especially, the failure mode of aircraft and mechanical structures, which are in complex vibration environment for a long time, usually belongs to vibration fatigue. However, due to the limitations of existing measurement technology, the generation and development process of vibration fatigue damage is still uncertain. A guided wave based method is proposed that a laser ultrasonic system is set up to scan the 2024-O aluminum alloy intermittently in the vibration fatigue process. The propagation characteristics of wave in the specimen are collected, so that the fatigue degree of local area can be characterized based on the change of wave velocity. This experimental method can track the development of fatigue damage, record the process of fatigue accumulation, and further realize the stiffness calculation of the most serious fatigue area.
{"title":"Evaluation of vibration induced local fatigue in aluminum alloy structure by using laser ultrasonic technique","authors":"Xiao Yunxian, Zhang Chao","doi":"10.1109/PHM-Nanjing52125.2021.9613037","DOIUrl":"https://doi.org/10.1109/PHM-Nanjing52125.2021.9613037","url":null,"abstract":"Vibration induced fatigue is one of the main forms of structural failure. Especially, the failure mode of aircraft and mechanical structures, which are in complex vibration environment for a long time, usually belongs to vibration fatigue. However, due to the limitations of existing measurement technology, the generation and development process of vibration fatigue damage is still uncertain. A guided wave based method is proposed that a laser ultrasonic system is set up to scan the 2024-O aluminum alloy intermittently in the vibration fatigue process. The propagation characteristics of wave in the specimen are collected, so that the fatigue degree of local area can be characterized based on the change of wave velocity. This experimental method can track the development of fatigue damage, record the process of fatigue accumulation, and further realize the stiffness calculation of the most serious fatigue area.","PeriodicalId":436428,"journal":{"name":"2021 Global Reliability and Prognostics and Health Management (PHM-Nanjing)","volume":"425 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116403230","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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