In some competitions the rules clearly state that all participating cars must install a restrictor valve structure in the intake system of the engine.The intake air volume of the engine is considerably affected due to...In some competitions the rules clearly state that all participating cars must install a restrictor valve structure in the intake system of the engine.The intake air volume of the engine is considerably affected due to the existence of such a valve.Indeed,a small interface diameter through which gas flows can lead to considerable flow resistance and loss.In this study,a four-cylinder engine for FSC racing is analyzed using a combined method based on numerical simulation and experiments.The analysis reveals that the main factors affecting the intake air volume are the intake manifold and the volume of the resonance chamber.The influence of such factors is assessed using a single variable method and an optimal model and parameters are obtained accordingly.Comparison of different results show that the maximum torque for the optimized system is increased from the original 42.6 N·m to 46.9 N·m,thus demonstrating an increase of 10.6%.These findings provide a theoretical basis for the design of the intake system and the improvement of engine performance.展开更多
This paper adopts an M/G/1 retrial queueing system with imperfect coverage and reboot delay.When the system detects an arrival,it will immediately process the arrival.On the other hand,if the arrivals are not detected...This paper adopts an M/G/1 retrial queueing system with imperfect coverage and reboot delay.When the system detects an arrival,it will immediately process the arrival.On the other hand,if the arrivals are not detected,the system will get into an abnormal state until it is restarted.Using the supplementary variable approach,the stationary probability generating function for the number of retrial arrivals and performance measures are derived.For illustration purposes and to study the impact of system parameters on performance measures,a real-world case of the data transmission mechanism for renewable energy power plants is presented to perform the optimisation analysis.Optimisation analysis is implemented to determine the optimum service rate to minimise the mean operating cost and the mean time of an arrival spent in the system.展开更多
基金Guangxi colleges and universities young and middle-aged teachers basic ability improvement project,which is called“Optimization Analysis of Gasoline Engine Performance Based on the Inlet Throttle for FSC Intake System”(No.2018KY0654)。
文摘In some competitions the rules clearly state that all participating cars must install a restrictor valve structure in the intake system of the engine.The intake air volume of the engine is considerably affected due to the existence of such a valve.Indeed,a small interface diameter through which gas flows can lead to considerable flow resistance and loss.In this study,a four-cylinder engine for FSC racing is analyzed using a combined method based on numerical simulation and experiments.The analysis reveals that the main factors affecting the intake air volume are the intake manifold and the volume of the resonance chamber.The influence of such factors is assessed using a single variable method and an optimal model and parameters are obtained accordingly.Comparison of different results show that the maximum torque for the optimized system is increased from the original 42.6 N·m to 46.9 N·m,thus demonstrating an increase of 10.6%.These findings provide a theoretical basis for the design of the intake system and the improvement of engine performance.
文摘This paper adopts an M/G/1 retrial queueing system with imperfect coverage and reboot delay.When the system detects an arrival,it will immediately process the arrival.On the other hand,if the arrivals are not detected,the system will get into an abnormal state until it is restarted.Using the supplementary variable approach,the stationary probability generating function for the number of retrial arrivals and performance measures are derived.For illustration purposes and to study the impact of system parameters on performance measures,a real-world case of the data transmission mechanism for renewable energy power plants is presented to perform the optimisation analysis.Optimisation analysis is implemented to determine the optimum service rate to minimise the mean operating cost and the mean time of an arrival spent in the system.
