Fluid-Structure Interaction Vibration Characteristics Analysis of Thick-Walled Pressurized Fluid-Conveying Pipes
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摘要: 针对船舶工程中厚壁充液加压管道的轴向流固耦合振动问题, 开展理论推导及频域求解研究。通过与文献算例对比验证所建立的计算方法的可靠性, 利用有限元计算及轴向流体压力波波速分析, 探讨厚壁理论与薄壁理论的适用性, 并以直管和拼接组合管为研究对象, 分析流速、内部静压对管道振动噪声传递的影响规律。计算结果表明, 厚壁理论用于计算厚径比大于0.5的管道振动响应时更为精确; 轴向流体压力波波速主要受管道材料、管道截面厚径比及长径比影响; 管内压力主要影响横向振动, 尤其作用于低阶频率, 会增强振动传递效应。Abstract: The theoretical derivation and frequency-domain solution for axial fluid-structure interaction vibration of thick-walled fluid-filled pipes with internal pressure in marine engineering were carried out. The proposed calculation method was validated by comparison with literature examples. The applicability of thick-walled and thin-walled theories was investigated using finite element method (FEM) calculation and axial fluid pressure wave speed analysis. The effects of flow velocity and internal static pressure on vibration and noise transmission of straight pipes and assembled pipes were discussed. Results show that the thick-walled theory is more accurate for calculating the vibration response of pipes with a thickness-to-radius ratio greater than 0.5; the axial fluid pressure wave speed is mainly affected by pipe material, sectional thickness-to-radius ratio and length-to-diameter ratio; internal pressure mainly influences transverse vibration, especially lower-order frequencies, and enhances vibration transmission.
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图 4 钢管薄壁理论与厚壁理论轴向流体压力波波速对比
Figure 4. Comparison of axial fluid pressure wave speeds of steel pipes calculated by thin-walled theory and thick-walled theory
图 5 橡胶管薄壁理论与厚壁理论轴向流体压力波波速对比
Figure 5. Comparison of axial fluid pressure wave speeds of rubber pipes calculated by thin-walled theory and thick-walled theory
图 6 橡胶管轴向位移响应对比
Figure 6. Comparison of axial displacement responses of the rubber pipe
图 7 不同长径比下橡胶管道2种理论轴向位移响应对比
Figure 7. Comparison of axial displacement response of the rubber pipe with different length-to-radius ratios calculated by two theories
图 8 不同静水压力下管道横向位移响应
Figure 8. Transverse displacement responses of the pipe under different hydrostatic pressures
图 9 不同静水压力下管道轴向位移响应
Figure 9. Axial displacement responses of the pipe unde different hydrostatic pressure
图 11 L型管道末端x方向振动速度响应
Figure 11. x-direction vibration velocity response at the end of the L-type pipe
表 2 不同管道类型及内压下总速度级和总声压级对比
Table 2. Comparision of total velocity levels and total sound pressure levels for different pipe types under internal pressure
管道类型 内部静压/MPa 总速度级/dB 总声压级/dB 含柔性管道 0 152.6 175.7 20 160.3 175.4 不含柔性管道 0 155.4 176.4 20 171.6 174.2 
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