The Study of the Sound Waves Transmission along the Fluid Line through the TsN-2 Electric Pump

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Abstract

BACKGROUND: Noise at production site or at any other place where technical equipment operates is a huge issue. It has a strong negative effect on human nervous system, reduces average lifespan and causes a number of severe diseases. That is why reduction of noise, produced by pumps, is one of the current priorities of hydraulic engineering.

AIMS: In this study, the experimental research of sound transmission through an operating pump and a non-operating pump was carried out. The aim of the research is to find out, whether the last stage of a multistage pump is the main source of hydrodynamic noise (HDN) in pressure line (or the first stage in suction line), or all stages somehow contribute to HDN.

METHODS: The experiment was carried out on the TsN-2 two-stage impeller pump. In order to generate a sinusoidal signal, an imbedded generator, a vibration test rig and a power amplifier were used. Data acquisition for measurement of HDN and vibrations was performed with use of a conditioning amplifier, a hydrophone and an accelerometer. A 4-channel spectrum analyzer served as a device for processing the studied signal. In addition, a theoretical calculation, considering some physical assumptions, was carried out in order to obtain a more general and accurate concept.

RESULTS: After completing the experiment, hydrodynamic noise levels and differences for three cases were obtained. These cases are for the switched-on pump, the switched-off pump and for the pump with the removed stage. The data obtained with hydrophones (hydrodynamic noise levels) was correlated with the data obtained with accelerometers (vibration levels). As the correlated data analysis result, the sound insolation distribution over the spectrum was obtained.

CONCLUSIONS: According to the study results, it can be concluded that the absence of one of two stages ambiguously affected on the sound-insolation properties of the pump. Moreover, no firm conclusions can be drawn about the pump operation influence on the change in its sound-insolation properties.

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About the authors

Boris P. Brainin

Research and Production Association of Hydraulic Machines (Gidromash)

Email: braynin@gidromash.com.ru
ORCID iD: 0000-0002-0645-5052
SPIN-code: 5897-4004

Cand. Sci. (Tech.), Deputy General Director for Development

Russian Federation, Moscow

Alexey A. Veselov

Bauman Moscow State Technical University

Author for correspondence.
Email: veselov.aleksei98@gmail.com
ORCID iD: 0000-0003-3505-5848
SPIN-code: 5777-6490

Student

Russian Federation, Moscow

Vladimir O. Lomakin

Bauman Moscow State Technical University

Email: lomakin@bmstu.ru
ORCID iD: 0000-0002-9655-5830
SPIN-code: 3467-7126

Dr. Sci. (Tech.), Head

Russian Federation, Moscow

Konstantin G. Mikheev

Research and Production Association of Hydraulic Machines (Gidromash); Bauman Moscow State Technical University

Email: zamgdpro@gidromash.com.ru
ORCID iD: 0000-0002-3142-6755
SPIN-code: 4536-2941

Technical Director

Russian Federation, Moscow; Moscow

Alexey I. Petrov

Bauman Moscow State Technical University

Email: alex_i_petrov@mail.ru
ORCID iD: 0000-0001-8048-8170
SPIN-code: 7172-0320

Cand. Sci. (Tech.), Associate Professor

Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. The № 6-46 test rig layout.1 – compressor; 2 – compressor valve; 3 – vacuum pump; 4 – vacuum pump valve; 5 – tank purge valve; 6 – tank; 7 – pressure vacuum meter; 8 – electric pump purge valve TsN-2; 9 – pressure gauge; 10, 11 – gate valve DN 300; 12 – water supply valve; 13 – electric pump TsN-2; 14 – valve DN 100; 15 – flow meter; 16 – vibration test rig; 17 – hydrophones.

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3. Fig. 2. The № 6–46 test rig.

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4. Fig. 3. The TsN-2 electric pump layout.

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5. Fig. 4. Sensor mounting layout. Sensor mounting layout: 1.1 – accelerometer on the suction line; 1.2 – accelerometer on the pump housing; 1.3 – accelerometer on the discharge line; 2.1 – hydrophone in the suction line; 2.2 – hydrophone in the discharge line.

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6. Fig. 5. The standard assembly. The HDN levels for combined action of the pump and the oscillator.

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7. Fig. 6. The standard assembly. The comparison of ‘pressure-suction’ HDN differences for the stopped pump and for the operating pump. The oscillator operates.

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8. Fig. 7. The HDN levels comparison. The pump is stopped. The oscillator operates.

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9. Fig. 8. The standard assembly. The Z-axis vibration levels comparison. The pump is stopped. The oscillator operates.

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10. Fig. 9. The first stage wheel is dismantled. The HDN levels for combined action of the pump and the oscillator.

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11. Fig. 10. The HDN level differences comparison. The pump operates. The oscillator operates.

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