海洋平臺(tái)減振系統(tǒng)的時(shí)滯非脆弱控制方法研究
發(fā)布時(shí)間:2018-10-26 14:48
【摘要】:海洋平臺(tái)是在海上開發(fā)油氣資源的重要技術(shù)裝備,長(zhǎng)期處在海洋環(huán)境中會(huì)受到地震、波浪、風(fēng)以及冰等多種環(huán)境載荷的耦合作用,而且由于平臺(tái)自身結(jié)構(gòu)特性會(huì)產(chǎn)生自激波浪力,這都將會(huì)使平臺(tái)發(fā)生振動(dòng)。因此,研究經(jīng)濟(jì)、可靠的減振控制方法以提高海洋平臺(tái)系統(tǒng)的穩(wěn)定性,對(duì)改善平臺(tái)作業(yè)人員的工作環(huán)境和保證機(jī)械設(shè)備的正常運(yùn)行有著極其重要的理論和實(shí)際價(jià)值。 本文對(duì)海洋平臺(tái)減振控制方法的研究主要基于時(shí)滯非脆弱控制和魯棒H_∞控制兩種方法,討論了控制增益攝動(dòng)和時(shí)滯對(duì)控制器減振效果的影響,具體內(nèi)容如下: 第一,研究了海洋平臺(tái)在非線性自激波浪力作用下,,時(shí)滯非脆弱控制方法的設(shè)計(jì)過程。首先,給出了海洋平臺(tái)在非線性自激波浪力干擾下的簡(jiǎn)化模型,得到了時(shí)滯非脆弱控制方法存在的充分條件;并進(jìn)一步給出了時(shí)滯非脆弱控制方法的兩種特殊形式及其存在的充分條件。最后,仿真實(shí)驗(yàn)表明:i)考慮控制器存在增益攝動(dòng)的情形下,時(shí)滯非脆弱控制方法對(duì)平臺(tái)的減振控制效果優(yōu)于時(shí)滯控制方法,而且施加的控制力更。籭i)在非脆弱控制器中人為的引入一個(gè)時(shí)滯,能提高控制器的作用效果;iii)與滯后動(dòng)態(tài)輸出反饋控制方法相比較,本文設(shè)計(jì)的時(shí)滯非脆弱控制方法允許的時(shí)滯上界更大。 第二,研究了海洋平臺(tái)不確定系統(tǒng)的時(shí)滯魯棒非脆弱H_∞控制方法中時(shí)滯的正作用。首先,給出了海洋平臺(tái)系統(tǒng)在參數(shù)攝動(dòng),自激波浪力和外部擾動(dòng)力同時(shí)作用時(shí)的模型,得到了時(shí)滯魯棒非脆弱H_∞控制方法存在的充分條件;然后,出于對(duì)比實(shí)驗(yàn)結(jié)果的目的,給出了時(shí)滯魯棒非脆弱H_∞控制方法特殊形式及其存在的充分條件。最后,仿真實(shí)驗(yàn)表明:i)不論標(biāo)稱系統(tǒng)還是不確定系統(tǒng),在控制器中人為的引入一個(gè)適當(dāng)大小的時(shí)滯,能有效的改善控制器作用效果;ii)與其他文獻(xiàn)中的控制方法相比較,本文設(shè)計(jì)的時(shí)滯魯棒非脆弱H_∞控制方法允許的時(shí)滯上界更大。
[Abstract]:Offshore platform is an important technical equipment for offshore exploitation of oil and gas resources. In the marine environment for a long time, it will be coupled by earthquake, wave, wind, ice and other environmental loads. Moreover, the structure of the platform will produce self-excited wave force, which will make the platform vibrate. Therefore, it is of great theoretical and practical value to study the economic and reliable vibration control methods to improve the stability of offshore platform system, to improve the working environment of platform operators and to ensure the normal operation of mechanical equipment. In this paper, the research of vibration control method for offshore platform is mainly based on time-delay non-fragile control and robust H _ 鈭
本文編號(hào):2296077
[Abstract]:Offshore platform is an important technical equipment for offshore exploitation of oil and gas resources. In the marine environment for a long time, it will be coupled by earthquake, wave, wind, ice and other environmental loads. Moreover, the structure of the platform will produce self-excited wave force, which will make the platform vibrate. Therefore, it is of great theoretical and practical value to study the economic and reliable vibration control methods to improve the stability of offshore platform system, to improve the working environment of platform operators and to ensure the normal operation of mechanical equipment. In this paper, the research of vibration control method for offshore platform is mainly based on time-delay non-fragile control and robust H _ 鈭
本文編號(hào):2296077
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