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A modified averaging scheme with application to the secondary Hopf bifurcation of a delayed van der Pol oscillator 被引量:9
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作者 Z.H.Wang H.Y.Hu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2008年第4期449-454,共6页
In this paper, a modified averaging scheme is presented for a class of time-delayed vibration systems with slow variables. The new scheme is a combination of the averaging techniques proposed by Hale and by Lehman and... In this paper, a modified averaging scheme is presented for a class of time-delayed vibration systems with slow variables. The new scheme is a combination of the averaging techniques proposed by Hale and by Lehman and Weibel, respectively. The averaged equation obtained from the modified scheme is simple enough but it retains the required information for the local nonlinear dynamics around an equilibrium. As an application of the present method, the delay value for which a secondary Hopf bifurcation occurs is successfully located for a delayed van der Pol oscillator. 展开更多
关键词 time delay ·Secondary Hopf bifurcation·The averaging technique van der Pol oscillator
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Logarithmic Growth Algorithm of Sleep Mode of Broadband Mobile Access Terminal
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作者 唐朝伟 邵艳清 唐晖 《Transactions of Tianjin University》 EI CAS 2010年第6期452-456,共5页
The sleep mode which works upon low arrival traffic is introduced in IEEE802.16e standard to reduce the power consumption of the mobile access terminal. Due to the rapid growth in the sleep interval in the exponential... The sleep mode which works upon low arrival traffic is introduced in IEEE802.16e standard to reduce the power consumption of the mobile access terminal. Due to the rapid growth in the sleep interval in the exponential growth algorithm prescribed in IEEE802.16e, the power saving efficiency of the mobile access terminal is limited and the average delay time of receiving data frames is prolonged when the arrival rate of data frames is low. To obtain lower power consumption and shorter average delay time, the l... 展开更多
关键词 IEEE802.16E sleep mode mobile access terminal average power consumption average delay time logarithmic growth algorithm
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Multi-Objective Optimization of Traffic Signal Timing at Typical Junctions Based on Genetic Algorithms
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作者 Zeyu Zhang Han Zhu +3 位作者 Wei Zhang Zhiming Cai Linkai Zhu Zefeng Li 《Computer Systems Science & Engineering》 SCIE EI 2023年第11期1901-1917,共17页
With the rapid development of urban road traffic and the increasing number of vehicles,how to alleviate traffic congestion is one of the hot issues that need to be urgently addressed in building smart cities.Therefore... With the rapid development of urban road traffic and the increasing number of vehicles,how to alleviate traffic congestion is one of the hot issues that need to be urgently addressed in building smart cities.Therefore,in this paper,a nonlinear multi-objective optimization model of urban intersection signal timing based on a Genetic Algorithm was constructed.Specifically,a typical urban intersection was selected as the research object,and drivers’acceleration habits were taken into account.What’s more,the shortest average delay time,the least average number of stops,and the maximum capacity of the intersection were regarded as the optimization objectives.The optimization results show that compared with the Webster method when the vehicle speed is 60 km/h and the acceleration is 2.5 m/s^(2),the signal intersection timing scheme based on the proposed Genetic Algorithm multi-objective optimization reduces the intersection signal cycle time by 14.6%,the average vehicle delay time by 12.9%,the capacity by 16.2%,and the average number of vehicles stop by 0.4%.To verify the simulation results,the authors imported the optimized timing scheme into the constructed Simulation of the Urban Mobility model.The experimental results show that the authors optimized timing scheme is superior to Webster’s in terms of vehicle average loss time reduction,carbon monoxide emission,particulate matter emission,and vehicle fuel consumption.The research in this paper provides a basis for Genetic algorithms in traffic signal control. 展开更多
关键词 Multi-objective GA optimization traffic light timings average delay time the average number of stops traffic capacity SUMO simulation
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