Vibration analysis of three-screw pumps under pressure loads and rotor contact forces

Li, Wanyou; Lu, Hanfeng; Zhang, Yue; Chuan, Zhu; Lu, Xin; Shuai, Zhi-Jun

doi:10.1016/j.jsv.2015.09.013

Cited by 16 publications

(10 citation statements)

References 21 publications

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“…By using the hydraulic motor noise level test platform and the semi-anechoic room, the noise sound pressure level of the bent-axis type axial piston motor is tested under different working conditions (Zhang et al, 2017). The noise level spectrum under different working conditions (BAHR et al, 2002;Li et al, 2016;Xu et al, 2016) is analyzed to determine the noise source inside the hydraulic motor. To ensure that the experimental results are effective, it is necessary to test the background noise.…”

Section: Background Noise Testmentioning

confidence: 99%

Analysis and application of a new noise test system for the hydraulic motor

Gong

Huang

et al. 2019

JAMDSM

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The loading system of the existing hydraulic motor performance test platform is complicated, the interference is too much, and it is not suitable to measure the hydraulic motor noise level. In this paper, a new platform for measuring the sound pressure level of the hydraulic motor noise is designed. It satisfies the requirement of simplification and less interference in other parts of the noise test except for the test object and ensures the accuracy of test results. This paper firstly introduces the hydraulic system and its principle, calculates the relations of the flow, pressure and power theoretically and verifies them with AMEsim. Then the control part, mechanical structure and semi-anechoic room of the hydraulic system are introduced and the method in the noise experiment is also explained. Finally, the noise level of a bent-axis type hydraulic piston motor is measured in the semi-anechoic room. The background noise and hydraulic motor noise under different conditions are tested by the Danish BK acoustic test system to verify the functionality and stability of the test platform and the noise spectrum, the efficiency of hydraulic system and the effect of the power recovery are analyzed.

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Section: Background Noise Testmentioning

confidence: 99%

Analysis and application of a new noise test system for the hydraulic motor

Gong

Huang

et al. 2019

JAMDSM

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“…A second area is the analysis of thermodynamic processes and the impact of the compressed medium on the functionality of the compressor. [3,4,6] Discrepancies between the values of operating parameters of a compressor with three parallel helical rotors obtained from a mathematical model and corresponding data obtained from a test bench are described in [5]. The differences in the data were related to the value of the decrease in compression pressure and the value of the temperature to which the rotors heated up.…”

Section: Introductionmentioning

confidence: 99%

Finite Elements Strenght Analysis of a Compressor Consisting of Four Helical Rotors

Nieoczym¹,

Szklarek²

2018

Adv. Sci. Technol. Res. J.

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The present article reports the results of tests of a compressor consisting of four helical rotors. Finite element strength analysis of rotors with varied screw thread pitch was performed. The analysis allowed us to determine the stress-strain state of the rotor material and deformation of rotors as an effect of loads generated during operation of the compressor. The analysis also made it possible to calculate the frequencies of the free vibrations of the rotors.

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“…An incline model, which combines bending deformation with linear displacement, is simulated using working conditions of the straddle carrier under inertial force impact as an imitation of vibration amplitude. 3 Li et al 4 investigated the main vibration source (fluid force and screw contact force) in the three-screw pump and found that the frequency of the fluid forces was even multiples of the rotating frequency and the decreasing tendency was dependent on the screw working length. It concluded that the screw contact force is more dominant than the fluid exciting force.…”

Section: Introductionmentioning

confidence: 99%

“…3 Li et al. 4 investigated the main vibration source (fluid force and screw contact force) in the three-screw pump and found that the frequency of the fluid forces was even multiples of the rotating frequency and the decreasing tendency was dependent on the screw working length. It concluded that the screw contact force is more dominant than the fluid exciting force.…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis of air-bearing work-stage under micro-scale effect

Chen

Dong

Pan

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part K:

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Vibration is one of the key factors that influences the ultra-precision machining. Taking the air-bearing work-stage for an example, the vertical vibration of the slide plate will directly affect the surface accuracy of machined parts. There are many factors that affect the vibration of precision machine tools, for example, the fluctuation of gas source, noise, environment, and so on. It will affect the machining accuracy and machining efficiency and cannot work in severe cases. Where the lubrication of the gas film in the air-bearing work-stage is in the micro scale category, its flow characteristics are different from the macroscopic gas flow, and it will also affect the stability of the sliding plate. This paper analyzed the vertical vibration characteristics of the air-bearing work-stage by considering the characteristics of gas film in micro scale when the velocity of the slide plate is 0. Based on the Reynolds equation and the characteristics of gas flow, the stiffness (K) and the damping (C) of the gas film are obtained by considering different micro factors. The gas film is assumed as the spring system. Then the stiffness and damping of the gas film are taken into the vibration equation of the slide plate. Through solving the vibration equations, the influence of the micro factor of the fluid on the vibration of the slide plate is researched. The results show that when considering the micro factors of the lubrication gas film, the vibration amplitude of slide plate and the frequency at the maximum amplitude are different from the one in macroscopic without considering any micro factors. At the same thickness of the gas film, the influence of the micro factors on the amplitude of slide plate is largest when three micro scale factors (the first order velocity slip, the flow factor Q and the effective viscosity) are considered. With the increase of the film thickness, the micro scale factors have the little effect on the frequency at the maximum amplitude. By analyzing the dimensionless parameters of the experimental signals and the different simulation signals, we found that when the micro-scale factors are considered at the same time, the vibration amplitude of the slide plate and the frequency at the maximum amplitude are closest to the experimental result. It is proved that combined with the micro scale factor, the analysis of dynamic characteristics of air-bearing work-stage is more accurate.

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Vibration analysis of three-screw pumps under pressure loads and rotor contact forces

Cited by 16 publications

References 21 publications

Analysis and application of a new noise test system for the hydraulic motor

Analysis and application of a new noise test system for the hydraulic motor

Finite Elements Strenght Analysis of a Compressor Consisting of Four Helical Rotors

Vibration analysis of air-bearing work-stage under micro-scale effect

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