基于ANSYS的声学升降装置主轴性能研究与分析

发布时间：2018-09-04 16:00

【摘要】：随着海洋科学技术的发展,一些先进的海洋下潜系统(如无人缆控机器人ROV、自航深潜器AUV)应运而生,水下声学定位技术可以实现导航、定位、跟踪等工作。超短基线声学定位系统是一种水声定位系统,因其结构简单、探测精度相对较高、操作容易而得到广泛应用。超短基线声学升降装置的主要功能是实现换能器的升降以及在水下不同位置的测量工作。升降装置从下到上由底座、闸阀、修配箱、轴承、竖杆架、换能器组等八部分组成,其中升降装置主轴组件性能影响整个测试装置的测量精度,是整个升降装置的核心部件。超短基线声学升降装置的技术难点有两个:一是升降装置主轴性能对整体装置测量精度的影响,需要通过提升升降装置主轴的物理性能来提升设备的测量精度;二是升降装置主轴在整个升降装置中的质量比重比较大,严重影响装置的成本和安装性能,因此需要通过主轴的优化来减小设备重量,降低设备成本。本文利用ANSYS Workbench中的Fluent流固耦合分析平台,建立有限元分析模型,分析升降装置主轴的动态特性,同时基于多目标优化的分析方法研究升降装置主轴的变形量与主轴材料、内径、航速之间的关系。对比不同内径升降装置主轴对测量精度的影响,优化升降装置主轴的内径、减轻主轴质量、节约成本。海上工作过程中,为了实时了解海水中升降装置主轴的变形情况,提出一种应变-转角测量方法,运用应变仪获得主轴上端应变,并且建立主轴上端应变和末端转角的函数关系,通过应变间接获得主轴的末端转角。该方法能实时了解升降装置主轴的工作状况,可有效评估换能器测量的准确性,对探测工作的展开具有一定的指导作用。通过陆上试验,验证了应变-转角测量方法的可靠性。
[Abstract]:With the development of marine science and technology, some advanced underwater submersible systems (such as ROV, AUV) emerge as the times require. Underwater acoustic positioning technology can realize navigation, positioning, tracking and so on. The ultrashort baseline acoustic positioning system is a kind of underwater acoustic positioning system, which is widely used because of its simple structure, relatively high detection accuracy and easy operation. The main function of ultrashort baseline acoustic lifting device is to realize the lifting of transducer and the measurement of different positions under water. The lifting device is composed of eight parts from bottom to top, such as base, gate valve, repair box, bearing, vertical pole frame, transducer group, etc. Among them, the performance of main shaft assembly of lifting device affects the measuring accuracy of the whole test device and is the core component of the whole lifting device. There are two technical difficulties in the ultra-short baseline acoustic lifting device: one is the influence of the main shaft performance of the lifting device on the measuring accuracy of the whole device, which needs to improve the measuring accuracy by lifting the physical performance of the main shaft of the lifting device; The second is that the mass proportion of the main shaft in the whole lifting device is relatively large, which seriously affects the cost and installation performance of the device, so it is necessary to reduce the weight and cost of the equipment through the optimization of the main shaft. In this paper, using the Fluent fluid-solid coupling analysis platform in ANSYS Workbench, the finite element analysis model is established to analyze the dynamic characteristics of the main shaft of the lifting device. At the same time, based on the analysis method of multi-objective optimization, the deformation of the main shaft of the lifting device and the material and inner diameter of the spindle are studied. The relationship between speed. By comparing the influence of the main shaft of different inner diameters on the measuring accuracy, the inner diameter of the main shaft of the lifting device is optimized, the quality of the main shaft is reduced and the cost is saved. In order to understand the deformation of the main shaft of the lifting device in seawater in real time, a method of measuring the strain-rotation angle is put forward, and the strain at the upper end of the spindle is obtained by using the strain meter. The function relationship between the upper end strain and the end rotation angle of the spindle is established, and the end rotation angle of the spindle is obtained indirectly by the strain. This method can understand the working status of the main shaft of the lifting device in real time, can effectively evaluate the accuracy of the measurement of the transducer, and has a certain guiding effect on the development of the detection work. The reliability of the method is verified by onshore test.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB565;P715

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