深海用波纹管式压力平衡装置的研究
发布时间：2019-05-24 21:30
【摘要】：深海环境下的大压力问题是进行深海资源探索开发的仪器设备所面临的首要解决的共性问题。压力平衡的方法已成为解决这一问题的首选方案。波纹管作为弹性平衡元件在各种压力位移补偿场合得到了广泛的应用，而波纹管结构的选取决定了平衡性能的优劣。 首先，利用有限元法对波纹管进行了非线性分析（材料非线性、波纹管的大挠度），并由此计算得到波纹管的允许位移；进一步分析了波纹管的几何参数对波纹管性能的关系。这里主要分析了外径、波数、壁厚、波高对波纹管轴向刚度的影响，总结了波纹管式压力平衡结构的设计原则。并运用正交试验的方法对波纹管的各几何参数对其性能影响关系进行优化，并由此得到了最优的参数组合。 其次，对深海压力平衡用波纹管的疲劳寿命进行了分析，并得到各结构参数（壁厚、波数、外径）对波纹管疲劳寿命影响的关系，为波纹管的设计选用提供了指导作用。 最后，运用数值积分法，提出了波纹管的体积变化量的计算方法；基于液体的可压缩性，推导出了波纹管变形后的体积变化量与波纹管的内外压差的关系式，并给出了波纹管的工作水深与内外压差的详细计算流程；针对以上的分析，设计了一种波纹管式压力平衡装置，能够测量深海下大压力的同时也能测量微小压力的变化。
[Abstract]:The problem of great pressure in deep-sea environment is the first common problem for instruments and equipment for deep-sea resources exploration and development. The method of pressure balance has become the first choice to solve this problem. As an elastic balance element, bellows have been widely used in various pressure and displacement compensation occasions, and the selection of bellows structure determines the advantages and disadvantages of the balance performance. Firstly, the nonlinear analysis of bellows (material nonlinear, large deflection of bellows) is carried out by using finite element method, and the allowable displacement of bellows is calculated, and the relationship between geometric parameters of bellows and the performance of bellows is further analyzed. In this paper, the effects of outer diameter, wavenumber, wall thickness and wave height on the axial stiffness of bellows are analyzed, and the design principles of bellows pressure balance structures are summarized. The orthogonal test method is used to optimize the relationship between the geometric parameters of bellows and their performance, and the optimal combination of parameters is obtained. Secondly, the fatigue life of bellows for deep sea pressure balance is analyzed, and the relationship between the influence of structural parameters (wall thickness, wavenumber, outer diameter) on the fatigue life of bellows is obtained, which provides guidance for the design and selection of bellows. Finally, the numerical integration method is used to calculate the volume change of bellows. Based on the compressibility of liquid, the relationship between the volume change of bellows after deformation and the internal and external pressure difference of bellows is derived, and the detailed calculation flow chart of working water depth and internal and external pressure difference of bellows is given. In view of the above analysis, a bellows pressure balance device is designed, which can measure the large pressure in the deep sea and the change of the small pressure at the same time.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P742
本文编号：2485191
[Abstract]:The problem of great pressure in deep-sea environment is the first common problem for instruments and equipment for deep-sea resources exploration and development. The method of pressure balance has become the first choice to solve this problem. As an elastic balance element, bellows have been widely used in various pressure and displacement compensation occasions, and the selection of bellows structure determines the advantages and disadvantages of the balance performance. Firstly, the nonlinear analysis of bellows (material nonlinear, large deflection of bellows) is carried out by using finite element method, and the allowable displacement of bellows is calculated, and the relationship between geometric parameters of bellows and the performance of bellows is further analyzed. In this paper, the effects of outer diameter, wavenumber, wall thickness and wave height on the axial stiffness of bellows are analyzed, and the design principles of bellows pressure balance structures are summarized. The orthogonal test method is used to optimize the relationship between the geometric parameters of bellows and their performance, and the optimal combination of parameters is obtained. Secondly, the fatigue life of bellows for deep sea pressure balance is analyzed, and the relationship between the influence of structural parameters (wall thickness, wavenumber, outer diameter) on the fatigue life of bellows is obtained, which provides guidance for the design and selection of bellows. Finally, the numerical integration method is used to calculate the volume change of bellows. Based on the compressibility of liquid, the relationship between the volume change of bellows after deformation and the internal and external pressure difference of bellows is derived, and the detailed calculation flow chart of working water depth and internal and external pressure difference of bellows is given. In view of the above analysis, a bellows pressure balance device is designed, which can measure the large pressure in the deep sea and the change of the small pressure at the same time.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P742
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