研究了恒定导通时间(constant on-time,COT)控制buck变换器的多开关周期振荡现象,揭示了buck变换器输出电容等效串联电阻(equivalent series resistance,ESR)对COT控制buck变换器控制性能的影响.研究结果表明,输出电容等效串联电阻是buc...研究了恒定导通时间(constant on-time,COT)控制buck变换器的多开关周期振荡现象,揭示了buck变换器输出电容等效串联电阻(equivalent series resistance,ESR)对COT控制buck变换器控制性能的影响.研究结果表明,输出电容等效串联电阻是buck变换器发生多开关周期振荡现象的关键因素,并给出了COT控制buck变换器发生多开关周期振荡的临界ESR值.当输出电容ESR值小于临界值时,发生多开关周期振荡现象;而当ESR大于临界值时,多开关周期振荡现象消失.最后,仿真结果验证了理论分析的正确性.展开更多
Platooning represents one of the key features that connected automated vehicles may possess as it allows multiple automated vehicles to be maneuvered cooperatively with small headways on roads. However, a critical cha...Platooning represents one of the key features that connected automated vehicles may possess as it allows multiple automated vehicles to be maneuvered cooperatively with small headways on roads. However, a critical challenge in accomplishing automated vehicle platoons is to deal with the effects of intermittent and sporadic vehicle-to-vehicle data transmissions caused by limited wireless communication resources. This paper addresses the co-design problem of dynamic event-triggered communication scheduling and cooperative adaptive cruise control for a convoy of automated vehicles with diverse spacing policies. The central aim is to achieve automated vehicle platooning under various gap references with desired platoon stability and spacing performance requirements, while simultaneously improving communication efficiency. Toward this aim, a dynamic event-triggered scheduling mechanism is developed such that the intervehicle data transmissions are scheduled dynamically and efficiently over time. Then, a tractable co-design criterion on the existence of both the admissible event-driven cooperative adaptive cruise control law and the desired scheduling mechanism is derived. Finally, comparative simulation results are presented to substantiate the effectiveness and merits of the obtained results.展开更多
In this article, we consider an optimal proportional reinsurance with constant dividend barrier. First, we derive the Hamilton-Jacobi-Bellman equation satisfied by the expected discounted dividend payment, and then ge...In this article, we consider an optimal proportional reinsurance with constant dividend barrier. First, we derive the Hamilton-Jacobi-Bellman equation satisfied by the expected discounted dividend payment, and then get the optimal stochastic control and the optimal constant barrier. Secondly, under the optimal constant dividend barrier strategy, we consider the moments of the discounted dividend payment and their explicit expressions are given. Finally, we discuss the Laplace transform of the time of ruin and its explicit expression is also given.展开更多
A new adaptive filtering principle based on capability control and semi-blind method is presented. A new semi-blind space-time equalizer based on constant modulus characteristic and structure risk minimum （SRM） crit...A new adaptive filtering principle based on capability control and semi-blind method is presented. A new semi-blind space-time equalizer based on constant modulus characteristic and structure risk minimum （SRM） criterion is also proposed. The equalizer sufficiently exploits the learning information of communication signals by using the structure information of filter itself through capability control technique. Namely, it maximizes the amount of learning information to im- prove filter tracking performance. Simulations are carried out and the result is compared with that of typical recursive least squares space-time equalizer （RLS-STE） and constant modulus semi-blind space-time equalizer （ CM-SB-STE ）. The results show that, even if with insufficient training data, the SRM constant modulus semi-blind space-time equalizer （SCM-SB-STE） keeps good tracking per- formance, showing promises in mobile wireless communications.展开更多
A novel and effective approach to exponentially stable analysis for dynamic systems on time scales is investigated using the nonlinear operator named the generalized Dahlquist constant in this paper, and simple yet ge...A novel and effective approach to exponentially stable analysis for dynamic systems on time scales is investigated using the nonlinear operator named the generalized Dahlquist constant in this paper, and simple yet generic criteria are derived ensuring the robust stability.展开更多
恒定导通时间(constant on-time,COT)控制Buck变换器的稳定性不仅受输出电容等效串联电阻(equivalent series resistance,ESR)的影响,还受电感和负载电阻的影响。为了研究电感和负载电阻的稳定性机理,建立了COT控制Buck变换器的分段线...恒定导通时间(constant on-time,COT)控制Buck变换器的稳定性不仅受输出电容等效串联电阻(equivalent series resistance,ESR)的影响,还受电感和负载电阻的影响。为了研究电感和负载电阻的稳定性机理,建立了COT控制Buck变换器的分段线性模型。利用分岔图、特征根轨迹研究了输出电容ESR较小时COT控制Buck变换器随电感和负载电阻变化时的动力学特性。结果表明,随着电感减小或负载电阻增大,Buck变换器由阵发混沌状态经边界碰撞分岔进入到稳定的电感电流断续导电模式(discontinuous conduction mode,DCM)周期1状态。进一步,推导了确保变换器稳定工作的电感和负载电阻的临界表达式。最后,数值仿真和理论分析得到了实验结果的验证。研究结果可以有效地指导COT控制Buck变换器的电路参数设计。展开更多
文摘研究了恒定导通时间(constant on-time,COT)控制buck变换器的多开关周期振荡现象,揭示了buck变换器输出电容等效串联电阻(equivalent series resistance,ESR)对COT控制buck变换器控制性能的影响.研究结果表明,输出电容等效串联电阻是buck变换器发生多开关周期振荡现象的关键因素,并给出了COT控制buck变换器发生多开关周期振荡的临界ESR值.当输出电容ESR值小于临界值时,发生多开关周期振荡现象;而当ESR大于临界值时,多开关周期振荡现象消失.最后,仿真结果验证了理论分析的正确性.
基金supported in part by the Australian Research Council Discovery Early Career Researcher Award(DE200101128)。
文摘Platooning represents one of the key features that connected automated vehicles may possess as it allows multiple automated vehicles to be maneuvered cooperatively with small headways on roads. However, a critical challenge in accomplishing automated vehicle platoons is to deal with the effects of intermittent and sporadic vehicle-to-vehicle data transmissions caused by limited wireless communication resources. This paper addresses the co-design problem of dynamic event-triggered communication scheduling and cooperative adaptive cruise control for a convoy of automated vehicles with diverse spacing policies. The central aim is to achieve automated vehicle platooning under various gap references with desired platoon stability and spacing performance requirements, while simultaneously improving communication efficiency. Toward this aim, a dynamic event-triggered scheduling mechanism is developed such that the intervehicle data transmissions are scheduled dynamically and efficiently over time. Then, a tractable co-design criterion on the existence of both the admissible event-driven cooperative adaptive cruise control law and the desired scheduling mechanism is derived. Finally, comparative simulation results are presented to substantiate the effectiveness and merits of the obtained results.
基金Supported in part by the National Natural Science Foun-dation of China and the Ministry of Education of China
文摘In this article, we consider an optimal proportional reinsurance with constant dividend barrier. First, we derive the Hamilton-Jacobi-Bellman equation satisfied by the expected discounted dividend payment, and then get the optimal stochastic control and the optimal constant barrier. Secondly, under the optimal constant dividend barrier strategy, we consider the moments of the discounted dividend payment and their explicit expressions are given. Finally, we discuss the Laplace transform of the time of ruin and its explicit expression is also given.
基金Supported by the National Natural Science Foundation of China(60772056)
文摘A new adaptive filtering principle based on capability control and semi-blind method is presented. A new semi-blind space-time equalizer based on constant modulus characteristic and structure risk minimum （SRM） criterion is also proposed. The equalizer sufficiently exploits the learning information of communication signals by using the structure information of filter itself through capability control technique. Namely, it maximizes the amount of learning information to im- prove filter tracking performance. Simulations are carried out and the result is compared with that of typical recursive least squares space-time equalizer （RLS-STE） and constant modulus semi-blind space-time equalizer （ CM-SB-STE ）. The results show that, even if with insufficient training data, the SRM constant modulus semi-blind space-time equalizer （SCM-SB-STE） keeps good tracking per- formance, showing promises in mobile wireless communications.
文摘A novel and effective approach to exponentially stable analysis for dynamic systems on time scales is investigated using the nonlinear operator named the generalized Dahlquist constant in this paper, and simple yet generic criteria are derived ensuring the robust stability.
