Analysis of Influence of Assembly Process Parameters on Mechanical Properties of Bolted Joint with Spigots

doi:10.12068/j.issn.1005-3026.2024.09.007

Abstract

Abstract:

The bolted joint with spigots of the aero?engine rotor system is taken as the research object， and the non?linear characteristics of the bending stiffness of the single bolted joint are analyzed. The bending stiffness of the bolted joint is analyzed by ANSYS， and the influence laws of such assembly process parameters as the bolted joint with or without a spigot， the initial preload of bolts， bolt diameter， and the interference of the spigot on the joint bending stiffness are discussed. The influence of the spigot on the inherent characteristics of the aero?engine rotor system is analyzed. The results show that the bending stiffness of the joint with the spigot presents piecework characteristics. Increasing preload of bolts， the bolt diameter and the interference of the spigot can improve the bending stiffness of the bolted joint. The relative error of the first three order natural frequency is less than 2% for rotor system with or without spigots. The bolted joint with spigots can reduce the maximum vibration amplitude of the rotor system.

Key words: bolted joint with spigots, bending stiffness, contact interface, assembly process parameter, vibration characteristics

CLC Number:

V 232.7

Zhong LUO, Yong-heng LUO, Xin XIONG, Fa-yong WU. Analysis of Influence of Assembly Process Parameters on Mechanical Properties of Bolted Joint with Spigots[J]. Journal of Northeastern University(Natural Science), 2024, 45(9): 1268-1276.

Figures/Tables 26

Fig.1 Connection structure diagram of the rotor system

Fig.2 Deformation zone analysis of the connection structure

Fig.3 Mechanical behavior under different axial loads

Fig.4 Simplified beam model

Fig.5 Axial deformation of the connection structure

Fig.6 Finite element model of the connection structure

Table 1 Element type selection

特征类型	单元类型
实体建模	Solid 185
接触设置	Targe 170与Conta 174
预紧力设置	Prets 179
过盈配合	CNOF

Table 2 Material parameters of the connection structure

参数	数值
弹性模量/GPa	108
泊松比	0.34
密度/(kg·m^-3)	4 500
摩擦系数	0.15

Fig.7 Variation of bending stiffness

Fig.8 Variation of the bending stiffness in literature [2]

Fig.9 Results of numerical analysis of bending stiffness

Fig.10 Contact status nephogram

Fig.11 Bolt 1 schematic diagram

Fig.12 Multiple relation of the bolt preload

Fig.13 Bending stiffness of the connection structure under different bolt preload

Fig.14 Multiple relation of the bolt preload under different preload

Fig.15 Bending stiffness of the connection structure under different bolt diameters

Fig.16 Multiple relation of the bolt preload under different bolt diameters

Fig.17 Bending stiffness of the connection structure under different interference

Fig.18 Multiple relation of the bolt preload under different interference

Fig.19 Comparison of assembly process parameters on increase of bending stiffness

Fig.20 Finite element model of the low pressure rotor system

Fig.21 First three modes of the rotor system with the spigot

Fig.22 First three modes of the rotor system without the spigot

Table 3 First three natural frequencies of the rotor

模态阶数	频率/Hz		相对误差%
模态阶数	止口	无止口	相对误差%
一阶	34.958	34.953	0.014
二阶	53.004	52.725	0.53
三阶	360.75	366.53	1.58

Fig.23 Amplitude?frequency characteristic curve of the rotor system

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