测控技术与仪器专业英语 张凤登UNIT-14.System Analysis.pptVIP

UNIT 14 System Analysis 14.1 Text Time-Domain Analysis 时域分析 14.4 General Knowledge  英文通知和便笺  通知(announcement)和便笺（short note）这两种文体的共同特征是简短且标题单一。它们的写作要求是表达准确、条理清晰、醒目易读等。 英文通知和便笺（续） * New Words sinusoidal [sain?s?id?l] a. 正弦的 abscissa [?bsis?] n. 横坐标 ramp [r?mp] n. 斜坡 parabolic [,p?r?b?lik] a. 抛物线形的 infer [inf?:] v. 推断[理，论，知]，推导（出） Notes fall into 自然地分作 From this standpoint the system time-domain analysis is well justified. 从这个观点来看，对系统进行时域分析是很合理的 This is important, as the time-domain analysis of systems higher than second order become rather involved. 这一点是重要的，因为高于二阶的系统的时域分析相当复杂。 Exercises 1. Answer the following questions. The response is a term generally used to describe the output of a system for a given input. There are two categories of responses. They are the time-domain response and the frequency-domain response. The step response of a system is broken down into two parts: the transient and steady-state portions. In the ramp response of the second-order system, its steady-state portion increases with time in ramplike fashion, while the difference between the input and the output remains constant. Since we are dealing with linear systems, any combination of the standard inputs must result in a combination of corresponding responses at the output of the system. We can obtain the order from the differential equations that represent the system. Depending on the location of their poles in the s plane, these systems can often be approximated by a first-order or second-order system. The system speed is inferred from the transient component. This classification indicates the number of integrations contained in the forward-path transfer function of the system and is very useful in predicting the system steady-state error for a given input. The values of poles can be adjusted by changing the system parameter values. Exercises (continue) 2. Replace the underlined parts in the following sentences with words or phrases from the text that best keep the