无线电能传输技术综述及应用前景

传统的电能传输方式大多通过导线或插座将电能传输到终端产品。这种传输方式会带来摩擦,易产生电火花等问题,从而影响电气设备的安全可靠性。而无线电能传输技术能使我们摆脱传统的电能传输方式,通过电磁感应、高频振荡、电磁共振、微波等多种形式实现非接触式的新型电能传输。文章讲述了无线电能传输技术在国内外的研究现状,详细叙述了现有理论框架下的四种无线电能传输技术,并比较了四种技术的特点和应用领域。最后,阐述了新型无线电能传输技术的应用技术领域。     

神经网络控制的应用和发展

神经网络控制的应用和发展ＴｈｅＡｐｐｌｉｃａｔｉｏｎａｎｄＤｅｖｅｌｏｐｍｅｎｔｏｆＮｅｕｒａｌＮｅｔｗｏｒｋＣｏｎｔｒｏｌ●费峻涛鲍远律朱民杨梅ＦｅｉＪｕｎｔａｏＢａｏＹｕａｎｌｕＺｈｕＭｉｎＹａｎｇＭｅｉ１引言神经网络首先用于解决模式识别问题。随...     

双凸极电励磁发电机系统非奇异终端滑模控制器的设计与仿真

针对双凸极电励磁发电机调压系统,提出了一种非奇异终端滑模控制的调压控制策略。介绍了双凸极电励磁发电机的结构,并构建了数学模型。在此基础上,详细分析了基于非奇异终端滑模控制的调压器工作原理,给出了相应的滑模面方程与滑模控制律。通过李雅普诺夫稳定性方程和固定PWM控制载波交截等限制条件,给出了控制律系数的计算选取方法。基于电磁有限元瞬态分析技术与控制电路构建了"场-路"联合仿真系统,并对发电机的稳态与动态运行性能进行了仿真,结果表明基于非奇异终端滑模控制的双凸极电励磁发电机调压系统具有良好的稳态性能和优良的动态特性,具有输出电压静差和纹波小、动态恢复时间短和动态输出电压变化小的优越性能。     

基于新颖自适应方法的微振动陀螺仪研究

针对微振动陀螺仪存在的制造误差以及本身参数易受环境影响,从而导致输入角速率难以测量的问题,提出了一种新颖的自适应方法来获取输入的角速率以及微陀螺仪的各项参数.该方法通过对微陀螺仪的数学模型进行变换,设计出一种新型的自适应辨识嚣,在线实时更新微陀螺仪角速率估计值.估计值的自适应律基于李雅普诺夫方法设计,保证了辨识器的全局...     

Atmospheric Pressure Plasma Jet in Organic Solution: Spectra,Degradation Effects of Solution Flow Rate and Initial pH Value

The organic compounds of p-nitrophenol （PNP） solution was treated by the active species generated in a stirred reactor by an atmospheric pressure plasma jet （APPJ）. The emission intensities of hydroxyl （OH）, oxygen （O）, nitric oxide （NO）, hydrogen （H） and molecular （N2） were measured by optical emission spectroscopy （OES）. The relations between the flow rates of the PNP solution and degradation, the degradation effects and initial pH value of the solution were also investigated. Experimental results show that there exist intense emissions of O （777.1 nm）, N（337.1 nm）, OH （306-310 nm） and NO band （200-290 nm） in the region of plasma. Given the treatment time and gas flow rate, the degradation increased as a function of discharge energy and solution flow rate, respectively. The solution flow rate for the most efficient degradation ranged from 1.414 m/s to 1.702 m/s, and contributed very little when it exceeded 2.199 m/s. This indicates the existence of diffusion-controlled reactions at a low solution flow rate and activation- controlled reactions at a high solution flow rate. Moreover, increasing or decreasing the initial pH value of neutral PNP solution （pH=5.95） could improve the degradation efficiency. Treated by APPJ, the PNP solutions with different initial pH values of 5.95, 7.47 and 2.78 turned more acidic in the end, while the neutral solution had the lowest degradation efficiency. This work clearly demonstrates the close coupling of active species, photolysis of ultraviolet, the organic solution flow rate and the initial pH value, and thus is helpful in the study of the mechanism and application of plasma in wastewater treatment.     

“自动控制原理”双语课程教学探索

首先分析了"自动控制原理"双语课程建设目标没,分别介绍了教学内容,教学方法、手段,教材和考核方法,剖析了双语课程的特色,最后对存在的问题提出改进计划。     

Regulation characteristics of oxide generation and formaldehyde removal by using volume DBD reactor

Discharge plasmas in air can be accompanied by ultraviolet(UV) radiation and electron impact,which can produce large numbers of reactive species such as hydroxyl radical(OH·),oxygen radical(O·),ozone(O3),and nitrogen oxides(NOx),etc.The composition and dosage of reactive species usually play an important role in the case of volatile organic compounds(VOCs) treatment with the discharge plasmas.In this paper,we propose a volume discharge setup used to purify formaldehyde in air,which is configured by a plate-to-plate dielectric barrier discharge(DBD) channel and excited by an AC high voltage source.The results show that the relative spectral-intensity from DBD cell without formaldehyde is stronger than the case with formaldehyde.The energy efficiency ratios(EERs) of both oxides yield and formaldehyde removal can be regulated by the gas flow velocity in DBD channel,and the most desirable processing effect is the gas flow velocity within the range from2.50 to 3.33 m s-1.Moreover,the EERs of both the generated dosages of oxides(O3 and NO2) and the amount of removed formaldehyde can also be regulated by both of the applied voltage and power density loaded on the DBD cell.Additionally,the EERs of both oxides generation and formaldehyde removal present as a function of normal distribution with increasing the applied power density,and the peak of the function is appeared in the range from 273.5 to 400.0 W l-1.This work clearly demonstrates the regulation characteristic of both the formaldehyde removal and oxides yield by using volume DBD,and it is helpful in the applications of VOCs removal by using discharge plasma.