發(fā)布時間：2017-12-30 22:34

  本文關鍵詞：海洋原位聲學測試裝置設計及釋放穩(wěn)定性研究　出處：《浙江理工大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 海洋原位測試裝置 有限元分析 釋放穩(wěn)定性 動力學仿真分析

【摘要】：隨著海洋資源開發(fā)與海底環(huán)境監(jiān)測技術地不斷推進,各種海洋測試裝置應運而生,其中海洋原位聲學測試裝置是釋放在淺海海底,通過對海底底質進行取樣分析,以及對沉積物的聲學特性分析對海底環(huán)境進行長時間實時監(jiān)測,并將監(jiān)測數(shù)據(jù)通過光纜實時傳輸至海岸基站的測試裝置,該系統(tǒng)不僅可以為海洋生態(tài)系統(tǒng)的研究提供更多可靠的實時數(shù)據(jù),還可以為海底介質與微生物的研究給予支持,對海底生態(tài)環(huán)境進行長期實時監(jiān)測。本文深入研究設計了海洋聲學原位測試裝置,并進行了加工和現(xiàn)場海試,分別利用虛擬樣機模擬技術和計算流體力學方法對裝置的釋放過程進行了動力學仿真分析,本文從以下幾個部分完成原位裝置的設計加工并分析其釋放過程中的穩(wěn)定性:1.根據(jù)實際工況要求,設計并加工出尺寸形狀合適,便于長途運輸,采用重力下行方式,外形似長矛,能搭載水聽器、聲速儀、高度計、測試矛桿、相關電纜及零配件的海洋原位測試裝置,建立裝置及其相關機構的三維模型,并利用有限元仿真軟件對重要的零部件和主要受力點進行力學分析以及強度校核,并根據(jù)仿真結果改善危險截面的受力情況和最大變形量,提高海洋原位測試裝置在海洋環(huán)境下的安全系數(shù)。2.分析復雜海洋載荷條件下釋放船的運動規(guī)律以及受到的海洋環(huán)境載荷,為后面的虛擬樣機分析提供必要的輸入?yún)?shù),再運用ADAMS虛擬樣機技術,建立海洋原位測試裝置在水上釋放過程中的虛擬樣機模型,研究和分析了原位裝置在各種海況以及不同布放速度下的動力學特性,從裝置的橫向擺動、速度、加速度、繩子拉力等各個方面比較分析,給出了海試實際釋放參數(shù)的選取依據(jù),為舟山現(xiàn)場海試提供理論基礎。3.運用流體計算力學分析軟件CFD建立了海洋原位測試裝置在水中運動的流體動力學模型,分析了原位裝置在水下運動時的流場分布和受力情況,仿真結果表明原位測試裝置在水中下降過程中穩(wěn)定性良好,傾斜角度滿足實際工況要求,為海試過程中的釋放方案、裝置結構設計以及參數(shù)選擇提供了有力的數(shù)據(jù)支撐。4.在嘉興近海進行了穩(wěn)定性釋放試驗,多次試驗結果表明原位裝置能夠安全平穩(wěn)地釋放。在舟山淺海也進行了原位裝置的釋放試驗,試驗結果與仿真計算結果相近,證明海洋原位測試裝置釋放穩(wěn)定性良好,海洋原位測試裝置能夠順利垂直地插入海底沉積物。
[Abstract]:With the continuous development of marine resources and seabed environmental monitoring technology, a variety of marine testing equipment came into being, in which the marine in-situ acoustic testing device is released in the shallow sea bottom. By sampling and analyzing the bottom sediment and analyzing the acoustic characteristics of sediment, the underwater environment is monitored for a long time, and the monitoring data is transmitted to the coastal base station in real time through optical cable. The system can not only provide more reliable real-time data for the study of marine ecosystem, but also support the research of submarine medium and microorganism. In this paper, the marine acoustics in-situ testing device is designed, and the processing and field sea test are carried out. The release process of the device was simulated and analyzed by using the virtual prototype simulation technology and the computational fluid dynamics (CFD) method respectively. This paper completes the design and processing of the in-situ device from the following parts and analyzes the stability of the device during its release process. According to the requirements of the actual working conditions, the design and processing of the size and shape of the device is suitable, which is convenient for long-distance transportation. Adopting gravity downward mode, the shape looks like a spear, can carry hydrophone, sonic speedometer, altimeter, test spear rod, related cable and spare parts of the marine in-situ testing device, establish the three-dimensional model of the device and its related mechanism. The finite element simulation software is used to analyze and check the strength of the important parts and the main force points, and according to the simulation results, the stress and the maximum deformation of the dangerous section are improved. Improve the safety factor of marine in-situ testing device under marine environment. 2. Analyze the motion law of release ship under complex marine load and the marine environmental load. It provides the necessary input parameters for the later virtual prototype analysis, and then uses the ADAMS virtual prototyping technology to establish the virtual prototype model of marine in-situ testing device in the process of water release. The dynamic characteristics of the in-situ device under various sea conditions and different placement velocities are studied and analyzed. The lateral swing velocity acceleration and rope tension of the device are compared and analyzed. The selection basis of the actual release parameters in the sea trial is given. 3. The hydrodynamic model of marine in-situ measurement device in water is established by using the fluid computational mechanics analysis software CFD. The flow field distribution and stress of the in-situ device in underwater motion are analyzed. The simulation results show that the in-situ testing device is stable in the process of water descent, and the tilt angle meets the actual requirements. It provides a strong data support for the release scheme, device structure design and parameter selection during the sea trial. 4. The stability release test is carried out in Jiaxing offshore. The results of many tests show that the in-situ device can be released safely and smoothly, and the in-situ device release test is also carried out in the shallow water of Zhoushan, and the experimental results are close to those of the simulation calculation. It is proved that the marine in-situ test device has good release stability, and the marine in-situ test device can be successfully inserted vertically into the seabed sediment.
【學位授予單位】：浙江理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH766

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