In the vehicle trajectory application system, it is often necessary to detect whether the vehicle deviates from the specified route. Trajectory planning in the traditional route deviation detection is defined by the d...In the vehicle trajectory application system, it is often necessary to detect whether the vehicle deviates from the specified route. Trajectory planning in the traditional route deviation detection is defined by the driver through the mobile phone navigation software, which plays a more auxiliary driving role. This paper presents a method of vehicle trajectory deviation detection. Firstly, the manager customizes the trajectory planning and then uses big data technologies to match the deviation between the trajectory planning and the vehicle trajectory. Finally, it achieves the supervisory function of the manager on the vehicle track route in real-time. The results show that this method could detect the vehicle trajectory deviation quickly and accurately, and has practical application value.展开更多
Natural ester insulating oil is widely used in transformers due to its good fire resistance and biodegradability.It is mainly composed of triglycerides,and there are some differ-ences in fatty acid composition and con...Natural ester insulating oil is widely used in transformers due to its good fire resistance and biodegradability.It is mainly composed of triglycerides,and there are some differ-ences in fatty acid composition and content among natural esters.Therefore,the fault diagnosis methods based on dissolved gas analysis are different.Three kinds of natural ester insulating oils are used to study the dissolved gas in oil under typical electrical and thermal faults of power transformers.Thermal faults from 200°C to 800°C and electrical faults with different discharge energies,which include partial discharge,breakdown discharge,and arc discharge,are simulated.The characteristic gases and their variation trends of natural esters under thermal and electrical faults are obtained through the experimental results.The gas generation characteristics of the three natural ester insu-lating oils under typical electrical and thermal faults are almost similar,but the relative percentages of characteristic gases have certain differences.Natural ester insulating oil with a higher unsaturation degree tends to produce more H2 and less C2H4.Finally,the fault diagnosis methods are used to determine the fault gas data,and the Duval pentagon is modified and improved according to the gas generation characteristics of natural esters.展开更多
文摘In the vehicle trajectory application system, it is often necessary to detect whether the vehicle deviates from the specified route. Trajectory planning in the traditional route deviation detection is defined by the driver through the mobile phone navigation software, which plays a more auxiliary driving role. This paper presents a method of vehicle trajectory deviation detection. Firstly, the manager customizes the trajectory planning and then uses big data technologies to match the deviation between the trajectory planning and the vehicle trajectory. Finally, it achieves the supervisory function of the manager on the vehicle track route in real-time. The results show that this method could detect the vehicle trajectory deviation quickly and accurately, and has practical application value.
基金supported by the National Natural Science Foundation of China under Grant U1866603.
文摘Natural ester insulating oil is widely used in transformers due to its good fire resistance and biodegradability.It is mainly composed of triglycerides,and there are some differ-ences in fatty acid composition and content among natural esters.Therefore,the fault diagnosis methods based on dissolved gas analysis are different.Three kinds of natural ester insulating oils are used to study the dissolved gas in oil under typical electrical and thermal faults of power transformers.Thermal faults from 200°C to 800°C and electrical faults with different discharge energies,which include partial discharge,breakdown discharge,and arc discharge,are simulated.The characteristic gases and their variation trends of natural esters under thermal and electrical faults are obtained through the experimental results.The gas generation characteristics of the three natural ester insu-lating oils under typical electrical and thermal faults are almost similar,but the relative percentages of characteristic gases have certain differences.Natural ester insulating oil with a higher unsaturation degree tends to produce more H2 and less C2H4.Finally,the fault diagnosis methods are used to determine the fault gas data,and the Duval pentagon is modified and improved according to the gas generation characteristics of natural esters.
