本文關(guān)鍵詞： 地震勘探 電磁式可控震源 掃描信號 系統(tǒng)辨識(shí) 自適應(yīng)控制　出處：《吉林大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國經(jīng)濟(jì)的日益發(fā)展和進(jìn)步,人們對資源的需求也越來越大,但是局限于許多資源的再生周期較長,資源勘探速度遠(yuǎn)遠(yuǎn)低于資源消耗速度,因此推進(jìn)技術(shù)改革和新型地質(zhì)勘探設(shè)備研發(fā)成為當(dāng)下關(guān)注熱點(diǎn)。地震勘探技術(shù)作為礦產(chǎn)資源勘查最行之有效的方法之一,在國內(nèi)外得到了廣泛關(guān)注。可控震源作為地震勘探中主要的激發(fā)源之一,其激發(fā)信號質(zhì)量直接影響地震勘探精度和準(zhǔn)確度。電磁式可控震源作為一種高頻振動(dòng)激發(fā)源,在淺層地質(zhì)勘探領(lǐng)域應(yīng)用廣泛,然而國內(nèi)外對電磁式可控震源系統(tǒng)的研究起步晚、進(jìn)展慢,加之電磁式可控震源系統(tǒng)自身結(jié)構(gòu)的獨(dú)特性和非閉環(huán)控制等缺點(diǎn)使得現(xiàn)有電磁式可控震源系統(tǒng)所激發(fā)掃描信號不可控,隨著振動(dòng)頻率的升高,震源系統(tǒng)的輸出信號衰減嚴(yán)重,無法滿足當(dāng)前地震勘探精度的要求。為了解決電磁式可控震源掃描信號控制問題,本文以500PHVS-型電磁式可控震源為研究對象,在現(xiàn)有硬件結(jié)構(gòu)基礎(chǔ)上分析了系統(tǒng)開環(huán)控制的不足,提出了電磁式可控震源掃描信號自適應(yīng)控制方案。該方案以計(jì)算機(jī)控制系統(tǒng)為核心,掃描信號生成模塊、信號處理系統(tǒng)、電磁激振器和數(shù)據(jù)采集模塊構(gòu)成閉環(huán)系統(tǒng)。在實(shí)現(xiàn)自適應(yīng)控制方案過程中,首先對電磁式可控震源的系統(tǒng)結(jié)構(gòu)進(jìn)行分析,借助于遞推增廣最小二乘系統(tǒng)辨識(shí)方法對震源系統(tǒng)結(jié)構(gòu)和參數(shù)進(jìn)行了求取并確定系統(tǒng)的數(shù)學(xué)模型表達(dá)式,并對辨識(shí)結(jié)果進(jìn)行了分析;然后在電磁式可控震源系統(tǒng)數(shù)學(xué)模型基礎(chǔ)上,借助于自適應(yīng)控制理論,開展了基于Lyapunov理論的Narendra穩(wěn)定自適應(yīng)控制方案,對控制器的設(shè)計(jì)進(jìn)行了數(shù)學(xué)推導(dǎo),并應(yīng)用到電磁式可控震源系統(tǒng)中,最終實(shí)現(xiàn)了電磁式可控震源掃描信號的自適應(yīng)控制,為推動(dòng)電磁式可控震源系統(tǒng)控制技術(shù)的發(fā)展提供了新方法。通過對Narendra穩(wěn)定自適應(yīng)控制器的性能仿真分析和電磁式可控震源系統(tǒng)控制前后的實(shí)際輸出掃描信號對比分析,驗(yàn)證了本文所提方案的可行性與有效性。最后,對全文工作進(jìn)行了總結(jié)分析,對自適應(yīng)控制技術(shù)在電磁式可控震源領(lǐng)域的應(yīng)用進(jìn)行了討論與展望。
[Abstract]:With the development and progress of China's economy, the demand for resources is increasing, but limited to the longer regeneration cycle of many resources, the speed of resource exploration is far lower than the speed of resource consumption. Therefore, to promote technological reform and research and development of new geological exploration equipment has become a hot issue. Seismic exploration technology as one of the most effective methods for mineral resources exploration, As one of the main excitation sources in seismic exploration, the quality of excitation signal directly affects the accuracy and accuracy of seismic exploration. Electromagnetic vibroseis is a kind of high frequency vibration source. It is widely used in shallow geological exploration field. However, the research on electromagnetic vibroseis system at home and abroad started late and made slow progress. In addition, the unique structure of the electromagnetic vibroseis and the non-closed-loop control make the scanning signal excited by the electromagnetic vibroseis uncontrollable. With the increase of the vibration frequency, the output signal of the source system attenuates seriously. In order to solve the problem of scanning signal control of electromagnetic vibroseis, this paper takes 500PHVS- type electromagnetic vibroseis as the research object, and analyzes the deficiency of open-loop control based on the existing hardware structure. An adaptive control scheme for scanning signal of electromagnetic vibroseis is proposed, which takes computer control system as the core, scanning signal generating module and signal processing system. The electromagnetic exciter and the data acquisition module constitute the closed-loop system. In the process of realizing the adaptive control scheme, the system structure of the electromagnetic vibroseis is analyzed. By means of the recursive augmented least squares system identification method, the structure and parameters of the seismic source system are obtained and the mathematical model expressions of the system are determined, and the identification results are analyzed. Then based on the mathematical model of electromagnetic vibroseis system and with the help of adaptive control theory, the Narendra stable adaptive control scheme based on Lyapunov theory is developed, and the design of the controller is derived. And applied to electromagnetic vibroseis system, finally realized the adaptive control of electromagnetic vibroseis scanning signal. In order to promote the development of the control technology of electromagnetic vibroseis system, a new method is provided. Through the simulation analysis of the performance of the Narendra stable adaptive controller and the contrast analysis of the actual output scanning signals before and after the control of the electromagnetic vibroseis system, The feasibility and effectiveness of the proposed scheme are verified. Finally, the work of this paper is summarized and analyzed, and the application of adaptive control technology in the field of electromagnetic vibroseis is discussed and prospected.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P631.4

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