海洋原位声学测试装置设计及释放稳定性研究

发布时间：2017-12-30 22:34

本文关键词：海洋原位声学测试装置设计及释放稳定性研究　出处：《浙江理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着海洋资源开发与海底环境监测技术地不断推进,各种海洋测试装置应运而生,其中海洋原位声学测试装置是释放在浅海海底,通过对海底底质进行取样分析,以及对沉积物的声学特性分析对海底环境进行长时间实时监测,并将监测数据通过光缆实时传输至海岸基站的测试装置,该系统不仅可以为海洋生态系统的研究提供更多可靠的实时数据,还可以为海底介质与微生物的研究给予支持,对海底生态环境进行长期实时监测。本文深入研究设计了海洋声学原位测试装置,并进行了加工和现场海试,分别利用虚拟样机模拟技术和计算流体力学方法对装置的释放过程进行了动力学仿真分析,本文从以下几个部分完成原位装置的设计加工并分析其释放过程中的稳定性:1.根据实际工况要求,设计并加工出尺寸形状合适,便于长途运输,采用重力下行方式,外形似长矛,能搭载水听器、声速仪、高度计、测试矛杆、相关电缆及零配件的海洋原位测试装置,建立装置及其相关机构的三维模型,并利用有限元仿真软件对重要的零部件和主要受力点进行力学分析以及强度校核,并根据仿真结果改善危险截面的受力情况和最大变形量,提高海洋原位测试装置在海洋环境下的安全系数。2.分析复杂海洋载荷条件下释放船的运动规律以及受到的海洋环境载荷,为后面的虚拟样机分析提供必要的输入参数,再运用ADAMS虚拟样机技术,建立海洋原位测试装置在水上释放过程中的虚拟样机模型,研究和分析了原位装置在各种海况以及不同布放速度下的动力学特性,从装置的横向摆动、速度、加速度、绳子拉力等各个方面比较分析,给出了海试实际释放参数的选取依据,为舟山现场海试提供理论基础。3.运用流体计算力学分析软件CFD建立了海洋原位测试装置在水中运动的流体动力学模型,分析了原位装置在水下运动时的流场分布和受力情况,仿真结果表明原位测试装置在水中下降过程中稳定性良好,倾斜角度满足实际工况要求,为海试过程中的释放方案、装置结构设计以及参数选择提供了有力的数据支撑。4.在嘉兴近海进行了稳定性释放试验,多次试验结果表明原位装置能够安全平稳地释放。在舟山浅海也进行了原位装置的释放试验,试验结果与仿真计算结果相近,证明海洋原位测试装置释放稳定性良好,海洋原位测试装置能够顺利垂直地插入海底沉积物。
[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.
【学位授予单位】：浙江理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH766

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