Research on dynamic modeling and electromagnetic force centering of piston/piston rod system for labyrinth piston compressor

Author:

Cheng Junming1,Zeng Xiangjun2,Liu Zhan1,Yu Xiaoling1,Feng Quanke1

Affiliation:

1. School of Energy and Power, Xi’an Jiaotong University, Xi’an, China

2. School of Electrical Engineering, Xi’an Jiaotong University, Xi’an, China

Abstract

Inside labyrinth piston compressor, the piston/piston rod system is main moving part. They suffer from very large periodically varying loads caused by gas force and inertia force. This may result in the piston rod’s bending and vibration. Therefore, the piston is always running eccentrically inside cylinder. It is difficult to calculate and predict the piston’s eccentricity accurately by the traditional analytical method. However, an accurate radial clearance between the piston and the cylinder wall must be calculated in the early design of the labyrinth piston compressor. Thus, this article proposes a new numerical method of studying the piston’s dynamic behavior, which is based on flexible body dynamics and finite element method. The method overall considers the piston rod’s characteristics of bending and vibration, effect of the radial clearance between the piston rod and the guide bearing, as well as crosshead and slideway. Through the model, the piston’s radial eccentric path can be better predicted. In addition, this article also introduces a new idea for realizing piston/piston rod system’s centering and utilizing an electromagnetic guiding system instead of traditional mechanical structure. The new centering technology will simplify greatly the inner structure of the compressor by removing the guide bearing. We have designed theoretically the structure of an electromagnetic guiding system and built its control model. Simulation verifies the effectiveness of this method, and good control result is obtained.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Control and Systems Engineering

Reference17 articles.

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Automatic Piston-Type Flow Standard Device Calibration System;Mathematics;2023-09-05

2. Research on precise control of piston eccentricity by electromagnetic levitation in labyrinth piston compressor;Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science;2023-08-09

3. Models and Algorithms for Determining the Safety Valves Critical Flow at Petrochemical Facilities;Cyber-Physical Systems: Modelling and Industrial Application;2022

4. Research of transverse dynamic oscillation for the piston in labyrinth compressor;Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering;2021-01-21

5. Leakage Characteristic Identification of Labyrinth Seals on Reciprocating Piston through Transient Simulations;Mathematical Problems in Engineering;2019-09-25

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