Modal Analysis of L Type Compressor Crankshaft

Xiaoyan Niu

doi:10.11648/j.ajmie.20180304.14

Abstract

Reciprocating compressor is an important equipment in industrial production. The crankshaft turns the thrust of the compressor piston rod into torque, which is an important component of the compressor. When reciprocating compressor works, there will be various forms of vibration such as torsion and bending. Therefore, the study of the crankshaft vibration becomes particularly important. Analyze the modal analysis of L type compressor crankshaft by using the finite element simulation. The first six order natural frequency and the corresponding mode of vibration of the crankshaft are obtained. And analyze the influence of the hollow and solid on the natural frequency and mode of vibration of the crankshaft. The results show: With the increase of vibration order, the natural frequency of the crankshaft increase. The crankshaft deformation is mainly bending at low frequency. The deformation of crankshaft is mainly composed of bending and torsional vibration at higher frequency. Moreover, the ends of solid crankshafts are less restrained. Extend the service life and performance of the crankshaft and other parts of the compressor by increasing the strength and stiffness of the crankshaft's local materials. And increasing the fillet radius at the transition point are adopted to reduce the deformation and torsion of the crankshaft.

Highlights

Reciprocating compressors are important power equipment in production [1], such as petroleum, natural gas, chemical industry, electric power and so on
It will optimize the design of the crankshaft, and it is of great significance to the development of the compressor to the multi column and high speed
In the modal analysis, considering the actual working condition of the compressor crankshaft in this paper, the fixed end constraint is applied to the left end of the crankshaft, and the radial constraint along the direction of the X axis is applied to the front end

Summary

Introduction

Reciprocating compressors are important power equipment in production [1], such as petroleum, natural gas, chemical industry, electric power and so on. Because this vibration usually occurs when the crankshaft is rotating at high speed, it becomes one of the important factors that cause compressor resonance [5]. The modal analysis of the compressor crankshaft makes it not resonate in the normal work and is strengthened in the place of easy bending and torsion deformation. It will optimize the design of the crankshaft, and it is of great significance to the development of the compressor to the multi column and high speed. The influence of hollow and solid on the natural frequencies and vibration modes of crankshaft L crankshaft is studied in this paper

The Establishment of the Model

Calculation Principle

Mode Analysis

Conclusion