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Research On Design Of Crankshaft Shaft System Of 30A-2 Star-type Reciprocating Compressor

Posted on:2020-10-05Degree:MasterType:Thesis
Country:ChinaCandidate:C L ZouFull Text:PDF
GTID:2392330572483486Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
With the rapid development of domestic manufacturing technology,compressors are widely used in modern industrial production as mechanical equipment for increasing gas pressure or conveying gas.Therefore,the performance requirements for reciprocating compressors are also increasing.It becomes an important goal to control the vibration and noise level of machine during the research and development stage in the reciprocating compressor industry.The vibration generated by the high-speed rotation of the crankshaft is an important factor of the compressor unit.The shafting dynamics affects not only the service life of the crankshaft,but also the safety and stability of the unit.In this paper,the 30A-2 star-type reciprocating compressor is taken as the research object.Based on the theoretical analysis,the multi-body system dynamics and finite element analysis method are used to analyze the vibration characteristics of the star-type compressor crankshaft shafting.The main contents include:1.The movement rule of each moving member in the crank-link mechanism is theoretically analyzed,and the kinematics model is derived.The function relationships are obtained between design parameters of major-minor connecting rod crank-link mechanism and the crank angle a.2.Based on the dynamics theory,the multi-body dynamics analysis software ADAMS is used to analyze the dynamics of the Master-Auxiliary crank-link mechanism of 30A-2 star-type compressor.The mechanical relationship between the crankshaft,connecting rod and piston is obtained.Other dynamic parameters,and generate a dynamic load file of the shaft force,providing load boundary conditions for the next finite element analysis.3.The solid simulation model of the star-type compressor crankshaft system is established by the PRO/E.Based on the finite element theory,the crankshaft shaft system is analyzed and the first 10 modes frequency of the crankshaft shaft are calculated by ANSYS Workbench software.The main failure modes of the shafting are determined according to the vibration of the shafting system,and the transient dynamic response analysis of the crankshaft shafting is performed.The dynamic response results show that the crankshaft shaft of the compressor has sufficient resistance to fatigue failure,which proves the effectiveness of the method in solving the calculation of the shafting vibration of the star-type reciprocating compressor unit.4.Based on the kinematics and dynamic characteristics of the main and auxiliary crankshaft linkage system of the 30A-2 star-type reciprocating compressor,this paper proposes six different crank-link mechanism design scheme for four-star-type compressors.The dynamic analysis of the crankshaft connecting rod and the analysis of the vibration characteristics of the shafting are carried out for each scheme mechanism,and the optimal design scheme is obtained.The purpose is to study the influence of the arrangement of the major-minor connecting rod crank-link mechanism on the shaft system of the star-type compressor,which is important for reducing the force of the moving parts of the star-type compressor and ensuring the fatigue strength of the crankshaft shafting.The research results in this paper can provide a theoretical basis for the vibration analysis of the star-type reciprocating compressor unit,and is expected to provide some references for the design and research and development of the new compressor.
Keywords/Search Tags:Star-type compressor, Crankshaft shafting, Multi-body dynamics, Modal analysis, Transient response analysis
PDF Full Text Request
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