Effect of longitudinal vibration of fluid-filled pipe with elastic wall on sound transmission character
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摘要: 弹性充液管道在一端固定,另一端受到谐和力作用时自身会产生稳态纵振动。相比于管道自身模态的谐振,弹性管道稳态纵振动的幅度更大,对于声场的影响也更大。对于管道稳态纵振动的研究可以更好地说明充液管道对管口辐射声场的影响。通过等效梁模型的解析计算及与实验结果的对比,验证了等效梁模型用于计算管道稳态纵振动的正确性,同时,提出一种用于隔离管道纵振动的方法,并通过实验验证了其有效性。Abstract: When one end of a fluid-filled pipe with an elastic wall is fixed and a harmonic force effect acts on the other end, a steady longitudinal vibration will be produced. Compared to the pipeline resonance mode, the amplitude of the steady longitudinal vibration of an elastic pipe is greater, and the effect on the sound is also greater. The study of the steady longitudinal vibration of pipes can better describe the effects of fluid-filled pipelines on the radiation sound field of the pipe opening. Through the contrast between the analysis calculation of the equivalent beam model and the experimental results, the accuracy of the equivalent beam model for the calculation of the steady longitudinal vibration of pipelines is verified, and a method of isolating the steady longitudinal vibration state is proposed and verified.
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表 1 管道截止频率的解析解和测量值
Table 1. Analytical solutions and measurement values of the pipeline cutoff frequency
Analytical solution Measurement value Cutoff frequency fn/kHz 24.0 15.0 表 2 厚壁钢管的谐振频率与测量值(声源1)
Table 2. The resonance frequencies and measuring values of thick wall pipeline (source 1)
谐振频率fz/Hz 阶数 理论值 测量值 7 3 294 3 280 9 4 308 4 176 11 5 321 5 312 14 6 842 6 704 15 7 349 7 296 16 7 856 7 808 17 8 363 8 496 19 9 376 9 552 21 10 390 10 470 23 11 404 11 220 24 11 910 11 940 25 12 417 12 300 26 12 924 12 860 27 13 431 13 680 28 13 938 14 060 29 14 445 14 370 表 3 厚壁钢管的谐振频率与测量值(声源2)
Table 3. The resonance frequencies and measuring values of thick wall pipeline (source 2)
谐振频率/z/Hz 阶数 理论值 测量值 9 4 308 4 160 15 7 349 7 080 16 7 856 7 840 18 8 869 8 616 19 9 376 9 248 20 9 883 9 752 21 10 390 10 470 23 11 404 11 550 25 12 417 12 300 26 12 924 12 810 27 13 431 13 480 28 13 938 14 130 29 14 445 14 420 -
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2017-1-116_en.pdf
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