To reduce vibration and noise and increase transmission efficiency, a three segment method for modifying the pinion profile was proposed. Cutter surface equations were deduced by changing the shape of the cutter-edge,...To reduce vibration and noise and increase transmission efficiency, a three segment method for modifying the pinion profile was proposed. Cutter surface equations were deduced by changing the shape of the cutter-edge, substituting three segment parabolas for the line. The influence of longitudinal tooth modifications on tooth surface load distributions was discussed. Transmission error minimization and uniformity of tooth surface load distribution were chosen as optimization goals and the modified parameters were obtained by applying the complex method. Finally, an experiment comparing the loaded transmission error, vibration, and noise both before and after modifications was carried out. The results indicate that the modified design is reliable.展开更多
This paper gives an insight on the effect of transmission line temperature variations, resulting from loading and weather conditions changes, on a power system＇s steady state and dynamic performance. The impact of dy...This paper gives an insight on the effect of transmission line temperature variations, resulting from loading and weather conditions changes, on a power system＇s steady state and dynamic performance. The impact of dynamic load models on system stability is also studied. The steady-state and dynamic stability simulation results of a 39 bus system for constant line impedance （the traditional simulation practice） are compared to the results with estimated, but realistic, temperature varied line impedances using PSLF （positive sequence load flow） software. The modulated line impedances will affect the thermal loading levels and voltage profiles of buses under steady state response, while the dynamic results will show improved damping in electro-mechanical oscillations at generator buses.展开更多
As a multi-dimensional complex system that integrates computing,network,and physical environments,cyber-physical system(CPS)involves a large amount of system data in its real-time control process.The efficiency of dat...As a multi-dimensional complex system that integrates computing,network,and physical environments,cyber-physical system(CPS)involves a large amount of system data in its real-time control process.The efficiency of data processing and transmission in CPS plays an important role in its control performance,however,few results have addressed such problems.This paper proposes a novel data-driven event-trigger mechanism to alleviate the data processing and transmission load for the data-driven predictive control method in CPS.The design of the event-triggered law can be transformed into solving a linear matrix inequality(LMI)based on the measured system data,while ensuring the stability of the integrated system.The improved performances are illustrated by the explicit simulation results,which indicates its potential application in CPS.展开更多
基金Supported by the National Natural Science Foundation under Grant No. 50875211
文摘To reduce vibration and noise and increase transmission efficiency, a three segment method for modifying the pinion profile was proposed. Cutter surface equations were deduced by changing the shape of the cutter-edge, substituting three segment parabolas for the line. The influence of longitudinal tooth modifications on tooth surface load distributions was discussed. Transmission error minimization and uniformity of tooth surface load distribution were chosen as optimization goals and the modified parameters were obtained by applying the complex method. Finally, an experiment comparing the loaded transmission error, vibration, and noise both before and after modifications was carried out. The results indicate that the modified design is reliable.
文摘This paper gives an insight on the effect of transmission line temperature variations, resulting from loading and weather conditions changes, on a power system＇s steady state and dynamic performance. The impact of dynamic load models on system stability is also studied. The steady-state and dynamic stability simulation results of a 39 bus system for constant line impedance （the traditional simulation practice） are compared to the results with estimated, but realistic, temperature varied line impedances using PSLF （positive sequence load flow） software. The modulated line impedances will affect the thermal loading levels and voltage profiles of buses under steady state response, while the dynamic results will show improved damping in electro-mechanical oscillations at generator buses.
基金supported in part by the National Key R&D Program of China[grant number 2022YFB4003800]in part by the National Natural Science Foundation of China[grant numbers 61903132 and 62203159]+1 种基金in part by the Natural Science Foundation of Hunan Province[grant numbers 2024JJ4014 and 2022JJ40097]in part by the Major project of Xiangjiang Laboratory[grant number 22xj01006].
文摘As a multi-dimensional complex system that integrates computing,network,and physical environments,cyber-physical system(CPS)involves a large amount of system data in its real-time control process.The efficiency of data processing and transmission in CPS plays an important role in its control performance,however,few results have addressed such problems.This paper proposes a novel data-driven event-trigger mechanism to alleviate the data processing and transmission load for the data-driven predictive control method in CPS.The design of the event-triggered law can be transformed into solving a linear matrix inequality(LMI)based on the measured system data,while ensuring the stability of the integrated system.The improved performances are illustrated by the explicit simulation results,which indicates its potential application in CPS.
