例句與造句

1. The origin and evolvement of cuk converter are introduced and the voltage and current waveforms of every period are analyzed and presented . the state differential equations of ideal cuk converter are deduced and the simulation models of ideal cuk converter , ac power supply and pulse width modulator ( pwm ) are erected
   論文介紹了cuk型dc / dc變換器由來、演變；分析了各個環(huán)節(jié)、期間的電壓、電流的變化情況及波形；推導(dǎo)了理想cuk變換器的狀態(tài)方程；建立了cuk主電路以及相關(guān)交流電源、脈沖寬度調(diào)制器的simulink仿真模型。
2. In the positioning servo - system , which generally is configured by the d . c . pulse width modulator ( pwm ) velocity governing system and position servo - loop , the parameter perturbance of pwm velocity loop really exist by reason of such as the load behavior ; power voltage supply ; operating setting value , etc . 1 , 2 ， and it cannot be ignored . by using the identification technique to form the mathematical model of the system , authors have confirmed the facts . therefore , to design the discrete sliding mode controller ( dsmc ) of the positioning servo - system , the perturbed parameters value bounds of the pwm velocity loop , which is as the controlled plant of position servo - loop , should be accounted . consequently , the design principle of dsmc for accounting system with parameter perturbance is proposed by the authors . the proposed method can ensure the stability of system with parameter perturbance and the behavior of non - overshoot , fast precise positioning . in order to reveal the effects of the design method , the comparative research work is done by the authors . also , it has been tested in an industrial experiment , the results proved it is satisfactory
   由直流脈寬調(diào)速系統(tǒng)( pwm )和位置環(huán)構(gòu)成的定位系統(tǒng)中，速度環(huán)的參數(shù)隨負(fù)載特性；電網(wǎng)電壓；給定工況而攝動是不容忽視的.作者通過系統(tǒng)辨識建模也證實了這一事實1 , 2 .因此在設(shè)計位置環(huán)的離散滑?？刂茣r，必須針對速度環(huán)(即位置環(huán)的控制對象)的參數(shù)攝動范圍采用“對象參數(shù)攝動離散滑?？刂破鞯脑O(shè)計方法” ，以確保系統(tǒng)在參數(shù)攝動時的穩(wěn)定性和快速、無超調(diào)、準(zhǔn)確定位的優(yōu)良動態(tài)品質(zhì).為剖析該設(shè)計方法的控制效果，本文作了對比性研究，并將該設(shè)計方法用于工業(yè)試驗中，取得了滿意的結(jié)果
3. It's difficult to find pulse width modulator in a sentence. 用pulse width modulator造句挺難的