電大機電控制工程基礎期末復習資料及參考答案小抄-免費閱讀
【正文】 s public security bureau shows some 100 foreign visitors enjoyed the 72hour policy by the end of March, most of them from the United States, the United Kingdom and Germany. Chengdu also reported robust growth in its overall tourist industry last year. Official statistics show that it received some 150 million tourists last year, an increase of 28 percent from 2021. Around million came from abroad, an increase of 12 percent. Total revenue from tourism surpassed 133 billion yuan ($). During his visit to Kazakhstan in September, Chinese President Xi Jinping proposed that China and Central Asia join hands to build a Silk Road economic belt to boost cooperation. The idea has been widely echoed in Central Asian countries, being an encouraging blueprint for Chinese areas along the Silk Road that has linked Asia and Europe for more than 2,000 years. In the next three weeks, China Daily reporters will travel through the belt in China and in Kazakhstan, Uzbekistan and Turkey. They will show the progress and expectations of the countries, businesses and peoples on the route. Shaanxi the start of the ancient Silk Road has positioned itself as the new starting point for the development of the Silk Road Economic Belt, which will strengthen China39。 解： 信號流圖如下： 《機電控制工程基礎》復習資料 第 8 頁 共 9 頁 應用梅森公式求傳遞函數(shù)： P1=G3G2， P2=G1G2 L1=G2H1， L2=G1G2H2 C sR s G G G GG H G G H( )( ) ? ?? ?3 2 1 22 1 1 2 21 3. 試判斷具有下述傳遞函數(shù)的系統(tǒng)是否穩(wěn)定，其中 G(s)為系統(tǒng)的前向通道傳遞函數(shù)， H(s)為系統(tǒng)的反饋通道傳遞函數(shù)： 1()( 1)( 3)Gs s s s? ??， ( ) 10Hs? 。 答： 定義：是開環(huán)頻率特性幅值為 1 時對負實軸的相位差值。 17. 二階系統(tǒng)在階躍信號作用下，其調(diào)整時間 ts 與阻尼比、 _____ __和 ____ ___有關。 《機電控制工程基礎》復習資料 第 4 頁 共 9 頁 幅頻 相頻 10. 某環(huán)節(jié)的傳遞函數(shù)為 G(s)=e－ 2s，它是 環(huán)節(jié) 延時 11. 校正元件的作用是改善系統(tǒng)的 性能。 222100A ( ) 1 ?? ???? ? 2. 對于最小相位系統(tǒng)而言，系統(tǒng)的相對穩(wěn)定性是指，相位裕量γ和幅值裕量 Kg都應該 。 21an? ? ??? 7. 判別系統(tǒng)穩(wěn)定性的出發(fā)點是系統(tǒng)特征方程的根必須為 ，即系統(tǒng)的特征根必須全部在 是系統(tǒng)穩(wěn)定的充要條件。 180186。 答： 控制系統(tǒng)的希望輸出與實際輸出之差；系統(tǒng)的結構不同，產(chǎn)生穩(wěn)態(tài) 誤差不同（或系統(tǒng)的類別越高，誤差越?。? 2. 什么是頻率響應？ 答： 系統(tǒng)對正弦信號或諧波信號的穩(wěn)態(tài)響應 3. 什么是線性系統(tǒng)？ 答： 組成系統(tǒng)元件的特性均是線性的（ 3 分），其輸入輸出關系都能用線性微分方程描述。 答： 在奈奎斯特圖上，奈奎斯特圖與負實軸 交點處幅值的倒數(shù)，稱幅值裕量 Kg。s largest breeding and resear
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