When incidents happen with the positioning spud of a backhoe dredger,the hull loses stability,heels significantly,and may even capsize under extreme conditions.Coupling the hydrodynamics and spud vibrations,this paper...When incidents happen with the positioning spud of a backhoe dredger,the hull loses stability,heels significantly,and may even capsize under extreme conditions.Coupling the hydrodynamics and spud vibrations,this paper investigates the dynamic stability of a backhoe dredger after spud failure based on the time domain method.The maximum dynamic heeling angle verifies the stability of the backhoe dredger.To identify the influences of environmental load,operating conditions,and spud-soil interactions,numerical motion simulations were conducted in the time domain.The main conclusions on dynamic stability consider the influences of relative environmental and operational factors.This study provides a powerful and efficient approach to analyze the dynamic stability of backhoe dredgers and to design flooding angles.展开更多
In order to measure the backhoe vibratory excavating resistance of a hydraulic excavator fast and precisely,the influences of vibratory excavating depth,angle,vibratory frequency,amplitude,bucket inserting velocity an...In order to measure the backhoe vibratory excavating resistance of a hydraulic excavator fast and precisely,the influences of vibratory excavating depth,angle,vibratory frequency,amplitude,bucket inserting velocity and soil type on the vibratory excavating resistance were analyzed.Simulation analysis was carded out to establish the bucket inserting velocity,amplitude and vibratory frequency considered as secondary variables and excavating resistance as primary variable.A fttzzy membership function was introduced to improve the anti-noise capacity of support vector machine,which is a soft-sensing model on the hydraulic excavator＇s backhoe vibratory excavating resistance based on fuzzy support vector machine.The simulation result reveals that its maximum relative training and testing error are nearly 0.68% and-0.47%,respectively.It is concluded that the model has quite high modeling precision and generalization capacity,and it can measure the vibratory excavating resistance accurately,reliably and fast in an indirect way.展开更多
This study identifies the main numerical characteristics of the KOMATSU WB93R-5 backhoe loaders reliability indicators,and has examined the durability of assemblies and units,as well as the time for the replacement of...This study identifies the main numerical characteristics of the KOMATSU WB93R-5 backhoe loaders reliability indicators,and has examined the durability of assemblies and units,as well as the time for the replacement of the KOMATSU WB93R-5 backhoe loaders’elements.To study the characteristics of the reliability indicators,a methodology for experimental research has been developed,using the complex,comparative and formal method,as well as the systematic,cybernetic and statistical approach.展开更多
This study identifies the main numerical characteristics of the Komatsu WB93R-5 backhoe loaders reliability indicators.To study the characteristics of the reliability indicators,a methodology for experimental research...This study identifies the main numerical characteristics of the Komatsu WB93R-5 backhoe loaders reliability indicators.To study the characteristics of the reliability indicators,a methodology for experimental research has been developed,using the complex,comparative and formal method,as well as the systematic,cybernetic and statistical approach.This study is a continuation of a study conducted by the author for another period.展开更多
This study identifies the main numerical characteristics of the KOMATSU WB93R-5 backhoe loaders reliability indicators,and sets the resource distribution laws for the engine components of Komatsu SAA4D104E-1.To study ...This study identifies the main numerical characteristics of the KOMATSU WB93R-5 backhoe loaders reliability indicators,and sets the resource distribution laws for the engine components of Komatsu SAA4D104E-1.To study the characteristics of the reliability indicators,a methodology for experimental research has been developed,using the complex,comparative and formal method,as well as the systematic,cybernetic and statistical approach.展开更多
文摘When incidents happen with the positioning spud of a backhoe dredger,the hull loses stability,heels significantly,and may even capsize under extreme conditions.Coupling the hydrodynamics and spud vibrations,this paper investigates the dynamic stability of a backhoe dredger after spud failure based on the time domain method.The maximum dynamic heeling angle verifies the stability of the backhoe dredger.To identify the influences of environmental load,operating conditions,and spud-soil interactions,numerical motion simulations were conducted in the time domain.The main conclusions on dynamic stability consider the influences of relative environmental and operational factors.This study provides a powerful and efficient approach to analyze the dynamic stability of backhoe dredgers and to design flooding angles.
基金Project(2003AA430200)supported by the National High Technology Research and Development Program of China
文摘In order to measure the backhoe vibratory excavating resistance of a hydraulic excavator fast and precisely,the influences of vibratory excavating depth,angle,vibratory frequency,amplitude,bucket inserting velocity and soil type on the vibratory excavating resistance were analyzed.Simulation analysis was carded out to establish the bucket inserting velocity,amplitude and vibratory frequency considered as secondary variables and excavating resistance as primary variable.A fttzzy membership function was introduced to improve the anti-noise capacity of support vector machine,which is a soft-sensing model on the hydraulic excavator＇s backhoe vibratory excavating resistance based on fuzzy support vector machine.The simulation result reveals that its maximum relative training and testing error are nearly 0.68% and-0.47%,respectively.It is concluded that the model has quite high modeling precision and generalization capacity,and it can measure the vibratory excavating resistance accurately,reliably and fast in an indirect way.
文摘This study identifies the main numerical characteristics of the KOMATSU WB93R-5 backhoe loaders reliability indicators,and has examined the durability of assemblies and units,as well as the time for the replacement of the KOMATSU WB93R-5 backhoe loaders’elements.To study the characteristics of the reliability indicators,a methodology for experimental research has been developed,using the complex,comparative and formal method,as well as the systematic,cybernetic and statistical approach.
文摘This study identifies the main numerical characteristics of the Komatsu WB93R-5 backhoe loaders reliability indicators.To study the characteristics of the reliability indicators,a methodology for experimental research has been developed,using the complex,comparative and formal method,as well as the systematic,cybernetic and statistical approach.This study is a continuation of a study conducted by the author for another period.
文摘This study identifies the main numerical characteristics of the KOMATSU WB93R-5 backhoe loaders reliability indicators,and sets the resource distribution laws for the engine components of Komatsu SAA4D104E-1.To study the characteristics of the reliability indicators,a methodology for experimental research has been developed,using the complex,comparative and formal method,as well as the systematic,cybernetic and statistical approach.
