本文選題：海底冷泉滲漏 + 聲特性�。� 參考：《廣東工業(yè)大學(xué)》2014年碩士論文

【摘要】：海底冷泉滲漏氣泡-水介質(zhì)聲學(xué)特性的研究在經(jīng)濟建設(shè)與生態(tài)保護等領(lǐng)域均具有重要的意義。海底冷泉滲漏氣泡-水介質(zhì)主要的聲學(xué)物理特性參數(shù)包括：聲速、聲衰減和氣泡流速。目前海底冷泉滲漏氣泡流量可以采用超聲回波測量,由于開放環(huán)境下氣泡的流動狀態(tài)不穩(wěn)定,反向超聲回波不但經(jīng)歷了海水的衰減,而且受到隨機分布氣泡的前向與逆向散射,回波信號是一種不穩(wěn)定的信號,造成測量精度難以保證。因此,為滿足海底冷泉滲漏流量研究的需要,在本課題組前期研究的基礎(chǔ)上,本文模擬海底冷泉滲漏,研制了以氣泡破碎均勻裝置為預(yù)處理模塊、矩形換能器為傳感器的海底冷泉滲漏聲波測量裝置,采用透射聲波波形-幅度測量氣泡流量。 論文介紹了海底冷泉滲漏氣泡測量的研究現(xiàn)狀,包括非聲波測量法與聲波測量法。概述了海底冷泉滲漏氣泡主要的聲特性。針對本實驗測量原理,分析了氣泡-水介質(zhì)的聲速、聲衰減和氣泡流速的計算方法。 闡述了海底冷泉滲漏聲波測量裝置的總體設(shè)計和結(jié)構(gòu)設(shè)計的兩部分：氣泡收集與預(yù)處理裝置和傳感器測量裝置。氣泡收集與預(yù)處理裝置主要介紹了氣泡破碎網(wǎng)格與氣泡破碎均勻裝置,并對其結(jié)構(gòu)及工作原理作了介紹。傳感器測量裝置主要介紹了發(fā)射換能器模塊和矩形換能器。對測量裝置的關(guān)鍵部件—聲波分路器進行了詳細設(shè)計與實驗驗證,通過在空氣中與水中的實驗驗證了聲波分路器設(shè)計的合理性與有效性。 通過發(fā)射與接收換能器模塊的耦合接觸,求出測量系統(tǒng)的傳播時間。運用設(shè)計的聲學(xué)特性測量系統(tǒng),以1MHz的矩形換能器為傳感器,模擬海底冷泉滲漏氣泡-聲波特性測量實驗。對采集到的聲波信號進行分析處理,主要包括氣泡-水介質(zhì)的聲速、聲衰減和氣泡流速。研究不同容積含氣率聲特性參數(shù)的變化情況。研究不同水深對實驗測量結(jié)果的影響,對比分析了不同水深下,氣泡-水介質(zhì)的聲速、聲衰減和氣泡流速的變化情況。 根據(jù)系統(tǒng)調(diào)試與實驗測量中發(fā)現(xiàn)的問題,提出海底冷泉滲漏氣泡-聲波特性測量需進一步改進意見。
[Abstract]:The study of acoustic characteristics of percolation bubble-water medium in cold spring is of great significance in the fields of economic construction and ecological protection. The main acoustic physical parameters of the percolation bubble-water medium include sound velocity sound attenuation and bubble velocity. At present, the leakage bubble flow of cold spring can be measured by ultrasonic echo. Due to the instability of bubble flow in open environment, the reverse-ultrasonic echo not only undergoes the attenuation of seawater, but also is subjected to the forward and reverse scattering of randomly distributed bubbles. Echo signal is a kind of unstable signal, which makes the precision of measurement difficult to guarantee. Therefore, in order to meet the need of the research on the leakage flow of submarine cold spring, based on the previous research of our group, this paper simulates the leakage of cold spring on the sea floor, and develops a preprocessing module based on the uniform device of bubble breakage. The rectangular transducer is a sensor for measuring the acoustic leakage of the cold spring at the bottom of the sea. The acoustic wave waveforms and amplitude are used to measure the flow rate of the bubble. In this paper, the research status of bubble leakage measurement in cold spring is introduced, including non-acoustic wave measurement and acoustic wave measurement. In this paper, the main acoustic characteristics of leakage bubbles in submarine cold springs are summarized. According to the principle of this experiment, the calculation methods of sound velocity, sound attenuation and bubble velocity of bubble-water medium are analyzed. In this paper, the general design and structure design of the acoustic wave measuring device for cold spring leakage in submarine are described: the bubble collecting and preprocessing device and the sensor measuring device. Bubble collecting and preprocessing device mainly introduces bubble breaking mesh and bubble breaking uniform device, and introduces its structure and working principle. Sensor measuring device mainly introduces the transmitter module and rectangular transducer. The design and experimental verification of the acoustic splitter, the key component of the measuring device, are carried out in detail. The rationality and validity of the design of the acoustic splitter are verified by experiments in air and water. The transmission time of the measurement system is calculated by the coupling contact between the transmitter and the receiving transducer module. Using the designed acoustic characteristic measurement system and using the rectangular transducer of 1MHz as the sensor, the experiment of measuring the bubble and acoustic wave characteristics of the cold spring leakage in the seafloor is simulated. The acoustic signals collected are analyzed and processed, including the sound velocity, sound attenuation and bubble velocity of the bubble-water medium. The change of acoustic characteristic parameters of different volume gas holdup was studied. The effects of different water depths on the experimental results are studied. The variation of sound velocity, sound attenuation and bubble velocity in bubble water medium under different water depths are compared and analyzed. According to the problems found in the system debugging and experimental measurement, it is suggested that the measurement of bubble-acoustic characteristics of submarine cold spring leakage should be further improved.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：P716.4

【引證文獻】

相關(guān)期刊論文 前1條

1 劉潤華;鄒大鵬;龍建軍;胡少興;;超聲多普勒測量海底滲漏氣泡流速的實驗研究[J];海洋技術(shù)學(xué)報;2016年02期

相關(guān)碩士學(xué)位論文 前1條

1 劉潤華;海底冷泉滲漏氣泡流速的超聲多普勒測量實驗研究[D];廣東工業(yè)大學(xué);2015年

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本文編號：1977552