Dynamic analysis of reciprocating compressor system with translational clearance and time-varying load

In this paper, by designing a new type of mechanism, the time-varying cylinder load ofthe reciprocating compressor is simulated. The time-varying cylinder pressure load includes fourprocesses of expansion, suction, compression and exhaust, where the pressure of the expansionprocess is gradually reduced until it is equal to the suction pressure, and the pressures of the suctionand exhaust processes are almost constant. The pressure of the compression process is graduallyincreased until it is equal to the exhaust pressure value. Through the motion simulation of themechanism, four processes of time-varying cylinder pressure load can be realized. This newmechanism will provide new ideas for the time-varying load involved in the simulation of thereciprocating compressor fault test bench.

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Dynamic analysis of reciprocating compressor with two revolute joint clearances

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/677/3/032079 ◽

2019 ◽

Vol 677 ◽

pp. 032079

Author(s):

Shouguo Cheng ◽

Huwei Chen

Keyword(s):

Dynamic Analysis ◽

Reciprocating Compressor ◽

Revolute Joint ◽

Joint Clearances

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Nonlinear dynamic analysis of a microsegment gear system with a time-varying base circle

Transactions of the Canadian Society for Mechanical Engineering ◽

10.1139/tcsme-2019-0086 ◽

2020 ◽

Vol 44 (2) ◽

pp. 279-293

Author(s):

Kang Huang ◽

Fengwei Xu ◽

Yangshou Xiong ◽

Meng Sang ◽

Yong Yi

Keyword(s):

Dynamic Analysis ◽

Nonlinear Dynamic ◽

High Speed ◽

Operating Conditions ◽

Gear System ◽

Resonant Peak ◽

Time Varying ◽

Heavy Load ◽

Involute Gear ◽

Base Circle

A systematic dynamic analysis of a microsegment gear system with a time-varying base circle, time-varying mesh stiffness, and gear backlash is carried out in this paper. By discretizing the meshing process, a six degree-of-freedom nonlinear dynamic model of a microsegment gear pair is established. To study the dynamic response of the microsegment gear and involute gear under various operating conditions, the numerical integration method is adopted. The dynamic transmission error (DTE) of the two gears is analysed in terms of time history charts, phase diagrams, fast Fourier transformation spectra, and Poincaré maps. The effects of support damping and support stiffness on radial vibration are also investigated. Results reveal that, compared with the involute gear system, the microsegment gear system is more stable at the high-speed condition and has a smaller amplitude of DTE under medium-speed and heavy-load, high-speed, and heavy-load conditions. The support damping and support stiffness have great effects on the resonant peak in the radial direction of the microsegment gear. Both the proposed model and numerical results are expected to provide a useful source of reference for the dynamic design of the microsegment gear system.

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Nonlinear Dynamic Analysis of a Multi-Gear Train With Time-Varying Mesh Stiffness Including Modification Coefficient Effect

Volume 6: Structures and Dynamics, Parts A and B ◽

10.1115/gt2011-46286 ◽

2011 ◽

Author(s):

T. N. Shiau ◽

J. R. Chang ◽

K. H. Huang ◽

C. J. Cheng ◽

C. R. Wang

Keyword(s):

Dynamic Analysis ◽

Nonlinear Dynamic ◽

Nonlinear Dynamic Analysis ◽

Gear Train ◽

Work Piece ◽

Time Varying ◽

Gear Pair ◽

Mesh Stiffness ◽

Harmonic Motion ◽

Gear Profile

The nonlinear dynamic analysis of a multi-gear train with time-varying mesh stiffness on account of the modification coefficient effect is in vestigated in this paper. The proposed application of the modification coefficient will revise the center distance of the gear pair, avoid undercut and raise the mesh stiffness of the designed gear system. In this study, the gear profile is generated from the relationship between the rack cutter and the gear work piece by using the envelope theory. The rack cutter with the modification coefficient increases the mesh stiffness and thus enhances the strength of the gear tooth. Then the time-varying mesh stiffness at the contact position of the gear pair is calculated from the tooth deflection analysis using the generated gear profile. With the obtained time-varying mesh stiffness, the nonlinear dynamic behavior of multi-gear train is investigated by using Runge-Kutta integration method. The numerical results of the studied examples show the harmonic motion, sub-harmonic motion, chaotic motion and bifurcation phenomenon of the gear train.

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