The whole angle mode gyroscope(WAMG)is considered to be the next generation architecture,but it is suffered from the asymmetry errors to conduct real products.This paper proposes a novel high frequency injection based...The whole angle mode gyroscope(WAMG)is considered to be the next generation architecture,but it is suffered from the asymmetry errors to conduct real products.This paper proposes a novel high frequency injection based approach for the error parameters online identification for the WAMG.The significance is that it can separate physical and error fingerprints to enable online calibration.The nonlinear WAMG dynamics are discretized to meet the requirement of numerical precision and computation efficiency.The optimized estimation methods are then constructed and compared to track asymmetry error parameters continuously.In the validation part,its results firstly prove that the proposed scheme can accurately identify constant asymmetry parameters with an overall tracking error of less than 1 ppm and the extreme numerical convergence can reach 10^(-12)ppm.Under the dynamic asymmetry variation condition,the root mean square errors(RMSE)indicate that the tracking accuracy can reach the level of10^(-3),which shows the robustness of the proposed scheme.In summary,the proposed method can effectively estimate the WAMG asymmetry errors online with satisfied performance and practical values.展开更多
Time-delayed rockbursts abruptly release huge energy,characterized by suddenness,randomness,and destructiveness,leading to substantial damage to both lives and property.This study explores the occurrence of time-delay...Time-delayed rockbursts abruptly release huge energy,characterized by suddenness,randomness,and destructiveness,leading to substantial damage to both lives and property.This study explores the occurrence of time-delayed rockbursts through statistical analysis of case studies in deep tunnels,including an extremely intensive time-delayed rockburst case.Through on-site surveys,blasting vibration tests,numerical calculations,and true triaxial compression experiments,this study analyzes the main factors and prevention and control strategies of time-delayed rockbursts based on an extremely intense time-delayed rockburst case.The results show that most time-delayed rockbursts are of high intensity.Paramount factors influencing their occurrence consider in-situ stresses,structural planes,and dynamic disturbances.Both high in-situ stress and its gradients provide the necessary conditions for such events,while the presence of abundant structural planes and frequent dynamic disturbances largely increase the risk of rockburst potential.To mitigate the risk of time-delayed rockbursts,energy control strategies are essential,incorporating measures such as energy reduction,prerelease,energy transformation,and energy absorption.Additionally,wave-absorbed support technology can reduce the amplitude and frequency of dynamic disturbances,further decreasing the likelihood of a rockburst occurring.Time-delayed rockburst occurrence requires long disturbance durations,compared to immediate rockbursts.Long-term,continuous,and multiple dynamic events will cause significant damage accumulation and formation of microcracks in hard rock.This study offers insights into the mechanisms underpinning time-delayed rockbursts and proposes prevention strategies for their control.展开更多
基金funded by the National Natural Science Foundation under grant No.62171420Natural Science Foundation of Shandong Province under grant No.ZR201910230031。
文摘The whole angle mode gyroscope(WAMG)is considered to be the next generation architecture,but it is suffered from the asymmetry errors to conduct real products.This paper proposes a novel high frequency injection based approach for the error parameters online identification for the WAMG.The significance is that it can separate physical and error fingerprints to enable online calibration.The nonlinear WAMG dynamics are discretized to meet the requirement of numerical precision and computation efficiency.The optimized estimation methods are then constructed and compared to track asymmetry error parameters continuously.In the validation part,its results firstly prove that the proposed scheme can accurately identify constant asymmetry parameters with an overall tracking error of less than 1 ppm and the extreme numerical convergence can reach 10^(-12)ppm.Under the dynamic asymmetry variation condition,the root mean square errors(RMSE)indicate that the tracking accuracy can reach the level of10^(-3),which shows the robustness of the proposed scheme.In summary,the proposed method can effectively estimate the WAMG asymmetry errors online with satisfied performance and practical values.
基金supported by the National Natural Science Foundation of China(Grant Nos.52222810 and 52178383).
文摘Time-delayed rockbursts abruptly release huge energy,characterized by suddenness,randomness,and destructiveness,leading to substantial damage to both lives and property.This study explores the occurrence of time-delayed rockbursts through statistical analysis of case studies in deep tunnels,including an extremely intensive time-delayed rockburst case.Through on-site surveys,blasting vibration tests,numerical calculations,and true triaxial compression experiments,this study analyzes the main factors and prevention and control strategies of time-delayed rockbursts based on an extremely intense time-delayed rockburst case.The results show that most time-delayed rockbursts are of high intensity.Paramount factors influencing their occurrence consider in-situ stresses,structural planes,and dynamic disturbances.Both high in-situ stress and its gradients provide the necessary conditions for such events,while the presence of abundant structural planes and frequent dynamic disturbances largely increase the risk of rockburst potential.To mitigate the risk of time-delayed rockbursts,energy control strategies are essential,incorporating measures such as energy reduction,prerelease,energy transformation,and energy absorption.Additionally,wave-absorbed support technology can reduce the amplitude and frequency of dynamic disturbances,further decreasing the likelihood of a rockburst occurring.Time-delayed rockburst occurrence requires long disturbance durations,compared to immediate rockbursts.Long-term,continuous,and multiple dynamic events will cause significant damage accumulation and formation of microcracks in hard rock.This study offers insights into the mechanisms underpinning time-delayed rockbursts and proposes prevention strategies for their control.
