This paper reports a cold atmospheric pressure DC-driven air plasma brush. Three stainless steel needles are symmetrically mounted on a slot shaped PVC slab to act as the elec- trodes. The brush driven by a direct cur...This paper reports a cold atmospheric pressure DC-driven air plasma brush. Three stainless steel needles are symmetrically mounted on a slot shaped PVC slab to act as the elec- trodes. The brush driven by a direct current （DC） power supply can generate an air plasma glow up to 30 mm wide with no inert gas addition and no air flow supplement. The plasma glow appears uniform no matter what kinds of material are processed. The measured current and the simulated current all show that each pulsed discharge including two peaks always oc- curs for different gaps between electrodes. Emission spectra measurement result shows that the obtained rotational temperatures are 300 K and the vibrational temperatures are 2250 K. Some reactive species are presented in the plasma glow, which suggest that the proposed plasma brush is beneficial to practical applications.展开更多
This report shows how starting from classic electric circuits embodying commonly electric components we have reached semi-complicated circuits embodying the same components that analyzing the signal characteristics re...This report shows how starting from classic electric circuits embodying commonly electric components we have reached semi-complicated circuits embodying the same components that analyzing the signal characteristics requires a Computer Algebra System. Our approach distinguishes itself from the electrical engineers’ (EE) approach that relies on utilizing commercially available software. Our approach step-by-step shows how Kirchhoff’s rules are applied conducive to the needed circuit information. It is shown for the case at hand the characteristic information is a set of coupled differential equations and that with the help of Mathematica numeric solutions are sought. Our report paves the research road for unlimited creative similar circuits with any degree of complications. Occasionally, by tweaking the circuits we have addressed the “what if” scenarios widening the scope of the investigation. Justification of the accuracy of our analysis for the generalized circuits is cross-checked by arranging the components symmetrizing the circuit leading to an intuitively predictable reasonable result. Mathematica codes are embedded assisting the interested reader in producing and extending our results.展开更多
采用直流电机作为金属带式无级自动变速器(Continuously variable transmission,CVT)的调速驱动机构,与传统的电控液动方式相比,可大大减少系统的零件数目,提高整机效率,提高CVT的速比响应速度和控制精度。在分析电驱动CVT结构的基础上...采用直流电机作为金属带式无级自动变速器(Continuously variable transmission,CVT)的调速驱动机构,与传统的电控液动方式相比,可大大减少系统的零件数目,提高整机效率,提高CVT的速比响应速度和控制精度。在分析电驱动CVT结构的基础上,建立了CVT调速机构和速比变化率的数学模型,设计了基于模糊控制和比例积分(Proportional plus integral controller,PI)控制的位置与速度双闭环控制器,并进行了系统仿真。结果表明,电驱动CVT具有很好的速比响应特性,能满足车辆行驶过程中速比变化的需要。展开更多
基金supported by National Natural Science Foundation of China(No.11105002)Open-End Fund of State Key Laboratory of Structural Analysis for Industrial Equipment(No.GZ1215)+1 种基金Natural Science Foundation for University in Anhui Province of China(No.KJ2013A106)Doctoral Scientific Research Funds of AUST
文摘This paper reports a cold atmospheric pressure DC-driven air plasma brush. Three stainless steel needles are symmetrically mounted on a slot shaped PVC slab to act as the elec- trodes. The brush driven by a direct current （DC） power supply can generate an air plasma glow up to 30 mm wide with no inert gas addition and no air flow supplement. The plasma glow appears uniform no matter what kinds of material are processed. The measured current and the simulated current all show that each pulsed discharge including two peaks always oc- curs for different gaps between electrodes. Emission spectra measurement result shows that the obtained rotational temperatures are 300 K and the vibrational temperatures are 2250 K. Some reactive species are presented in the plasma glow, which suggest that the proposed plasma brush is beneficial to practical applications.
文摘This report shows how starting from classic electric circuits embodying commonly electric components we have reached semi-complicated circuits embodying the same components that analyzing the signal characteristics requires a Computer Algebra System. Our approach distinguishes itself from the electrical engineers’ (EE) approach that relies on utilizing commercially available software. Our approach step-by-step shows how Kirchhoff’s rules are applied conducive to the needed circuit information. It is shown for the case at hand the characteristic information is a set of coupled differential equations and that with the help of Mathematica numeric solutions are sought. Our report paves the research road for unlimited creative similar circuits with any degree of complications. Occasionally, by tweaking the circuits we have addressed the “what if” scenarios widening the scope of the investigation. Justification of the accuracy of our analysis for the generalized circuits is cross-checked by arranging the components symmetrizing the circuit leading to an intuitively predictable reasonable result. Mathematica codes are embedded assisting the interested reader in producing and extending our results.
文摘采用直流电机作为金属带式无级自动变速器(Continuously variable transmission,CVT)的调速驱动机构,与传统的电控液动方式相比,可大大减少系统的零件数目,提高整机效率,提高CVT的速比响应速度和控制精度。在分析电驱动CVT结构的基础上,建立了CVT调速机构和速比变化率的数学模型,设计了基于模糊控制和比例积分(Proportional plus integral controller,PI)控制的位置与速度双闭环控制器,并进行了系统仿真。结果表明,电驱动CVT具有很好的速比响应特性,能满足车辆行驶过程中速比变化的需要。
