Analysis of Vertical Vibration Mechanism of Reciprocating Compressors considering Flexibility of Piston Rod and Crosshead Subsidence

Cheng, Shouguo; Liu, Shulin; Xiao, Shungen; Liu, Dong; Sun, Xin

doi:10.1155/2019/2747205

Cited by 2 publications

(2 citation statements)

References 28 publications

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“…Through the dynamic analysis of the rigid and flexible model of the main moving mechanism of the reciprocating compressor, which regards the crank connecting rod as a rigid body and the piston rod as a flexible cantilever beam, it is found that the stiffness of the piston rod and the dynamic characteristics of the crankshaft change periodically with the change of cylinder pressure. [12][13][14] As the key component of the compressor, the dynamic characteristics of the crankshaft are bound to affect the movement of the piston rod and the dynamic behavior of the piston. Based on this consideration, some scholars established the rigid and flexible coupling dynamics model of the crankshaft system from the perspectives of crankshaft torsional vibration, modal analysis, and piston rod vibration using the multi-body dynamics theory and finite element method, and analyzed the vibration characteristics of the crankshaft, the modal change of the piston rod and the eccentric vibration of the piston under the action of load in detail.…”

Section: Introductionmentioning

confidence: 99%

Research on precise control of piston eccentricity by electromagnetic levitation in labyrinth piston compressor

Zhang

Pan

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The piston in the Labyrinth piston compressor (LPC) usually runs eccentrically in the cylinder, which results in large internal leakage and low volumetric efficiency. An active electromagnetic control method based on the electromagnetic levitation theory was proposed in this paper to control the piston eccentricity, and a triple close-loop multi-factor coupled feedback control strategy composed of a current loop, a velocity loop, and a displacement loop was designed to realize the levitation control of the piston. The experimental research shows that there is serious piston eccentricity in the LPC, and the piston eccentricity is positively correlated with the increase of compressor pressure ratio and speed. By adopting the active electromagnetic control system proposed in this paper, the piston eccentricity is significantly reduced, and the maximum reduction is over 88%. Further research shows that the volume flow rate and volumetric efficiency of the LPC with control are maximum improved by about 45.6% and 44%, respectively. In conclusion, the piston eccentricity in the LPC could be effectively reduced by adopting the active electromagnetic control method proposed in this paper, thus improving its performance.

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Section: Introductionmentioning

confidence: 99%

Research on precise control of piston eccentricity by electromagnetic levitation in labyrinth piston compressor

Zhang

Pan

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Model analysis and vibration analysis of the crankshaft and connecting rod mechanism inside the reciprocating compressor could predict the vibration of the piston rod but not the transverse oscillation motion. [23][24][25][26][27][28] So far, the transverse dynamic oscillation of the piston inside the labyrinth compressor are remained to reveal based on the real physical model of the piston, such as adopting the pressure load on the piston.…”

Section: Introductionmentioning

confidence: 99%

Research of transverse dynamic oscillation for the piston in labyrinth compressor

Zhang

Liu

Hao³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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In labyrinth compressor, non-contact labyrinth sealing clearance was designed between piston and cylinder wall to process oil-free gas containing fine particles. To prevent the collision between piston and cylinder wall, this labyrinth clearance was usually set bigger than 2‰ of the piston diameter. Such a big clearance seriously increased the leakage rate and reduced the volume efficiency of the compressor. Thus, it was necessary to investigate the piston transverse oscillation, and find a way to minimize the oscillation amplitude to reduce the labyrinth clearance set. In this paper, a dynamic model was established to predict the piston transverse oscillation based on inertia mass vibration analysis and finite difference method. Experiments investigation of the piston transverse oscillation track showed high prediction accuracy of the proposed model. Then, structure parameters optimization of the compressor was carried out to reduce piston oscillation amplitude. It was found that ratio of the crank shaft radius to connecting rod length and the position of the guide bearing were two key parameters determining the oscillation amplitude. Finally, a case study showed that the oscillation amplitude could be reduced by 53% by adopting optimized parameters.

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Analysis of Vertical Vibration Mechanism of Reciprocating Compressors considering Flexibility of Piston Rod and Crosshead Subsidence

Cited by 2 publications

References 28 publications

Research on precise control of piston eccentricity by electromagnetic levitation in labyrinth piston compressor

Research on precise control of piston eccentricity by electromagnetic levitation in labyrinth piston compressor

Research of transverse dynamic oscillation for the piston in labyrinth compressor

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