Using direct current generator principle , set up electromagnetic limit speed auto - rotate nozzle stable state operate circuit , mechanics , energy equation 应用直流发电机原理,建立电磁限速的自旋转喷头稳态运行时的电路、力学、能量方程。
According to the theory of the bandgap reference , a ptat current generator was designed , then the proportional voltage value to temperature could be achieved 利用带隙基准原理设计获得与绝对温度成正比( ptat )电流,进而获得与温度成正比的电压值。
Hf electrothermal equipment production company , be applied to smelting . qian welding . heat treatment . forging hf hanguan . large direct current generator mechanics 我公司生产中高频电热设备,可应用于熔炼.钎焊.热处理.锻造高频焊管.大型直流电动机调速等
I hf electrothermal equipment production company , be applied to smelting . qian welding . heat treatment . forging hf hanguan . large direct current generator mechanics 我公司生产中高频电热设备,可应用于熔炼.钎焊.热处理.锻造高频焊管.大型直流电动机调速等
If the subscription is a scheduled subscription , the scheduled time occurred in the interval between the last generator rule firing and the current generator rule firing 如果订阅是计划订阅,计划时间位于上次生成器规则触发和当前生成器规则触发之间的间隔中。
The first is to fix and debug the impulse current generator and fix kinds of channel models of lightning current by which to generate artificial lightning current 论文主要分为三个部分。第一部分论述安装、维修、调试冲击电流发生器,制作各种雷电流通道模型。
This paper starts the research of the liquid floated pendulous accelerometer testing system according to the engineering . at first , this paper gives the brief introduction of the history and present status of accelerometer and its testing technology , the working principium and math model of the liquid floated pendu - lous accelerometer , and then , decides the binary width pulse force retrim loop as the design proposal of testing system , researches the transfer function of every part in the system emphasizly , analyses the stability of the whole accelerometer testing system from the angle of control theoretics by the open loop transfer function of system , and designed the correcting net , analyses the basal problems such as resolution , sampling restraint , precision and so on , designs the hardware testing circuits such as preamplification , band - pass filter , alternating amplifier , phase sensitive demodulatorn , pulse - width modulation , frequency scale circuit , moment current generator . finally , using the graphics program language labv - iew which is designed for testing field especially by ni accomplishes the solfware design of testing system , realized the testing functions 首先对加速度计及其测试技术的发展历史和现状,液浮摆式加速度计的工作原理和数学模型等作了简要的介绍,然后确定了以二元调宽脉冲再平衡测试回路为设计方案,并从控制理论的角度进行了分析,着重研究了系统中各部分的传递函数,利用系统开环传递函数分析了系统的稳定性,同时设计了系统的校正网络;分析了二元调宽脉冲再平衡测试回路的分辨率、采样约束以及测试精度等基本问题,并按照系统分析的结果设计了包括前置放大、带通滤波、交流放大、相敏解调、脉宽调制、频标电路以及力矩电流发生器等测试系统各部分硬件电路,验证了电路的正确性,最后按照测试系统的要求,采用了美国ni公司专为测试领域所开发的虚拟仪器工具? ? labview作为测试软件开发工具,利用该图形化编程语言完成了测试系统软件部分的设计,实现了测试功能。
On the one hand , the design uses low voltage cascode op framework to improve its gain ; on the other hand , it applies self - bias and cascode structure to the whole sensing circuit . by using the improved method , we have successfully obtained low power consumption , low offset , high linear and high psrr ptat current generator under low power supply 在电路设计上一方面改进运放结构,采用低压共源共栅结构以提高其增益,另一方面整体传感电路采用自偏置结构和共源共栅电流镜结构,在低电源电压下成功设计了低功耗、低失调、高线性度和高电源电压抑制比的ptat电流产生电路。
The research shows that students misunderstand the relation between force and motion . gravity and action / reaction ; that in dc circuit , students of different age groups have the belief of " consumption of current " , " clashing currents " and " the battery as a constant current generator " ; that in understanding the concepts of electricity students lack th e knowledge of relating the micro with the macro ; and that students have serious difficulties in understanding the propagation of mechanics wave , the speed of wave and superposition , and do not make a distinction between the initial conditions and the medium properties of the system 具体表现在:学生对力和运动的关系、重力和平衡、作用力与反作用力存在一些误解;对直流电路,不同年龄的学生不同程度地存在电流消耗、碰撞电流、恒定电流源等观念,而且对电学概念的理解缺乏宏观与微观的联系;学生在机械波的传播、波速、波的叠加上存在严重的困难,对于机械波的传播学生不能区分初始条件和媒质特性,并错误地将动力学某些观念与机械波进行类比。