Abstract
In a bolted disk–drum joints structure, assembly parameters, such as the number and pretightening force of the tightening bolts, will affect the vibration characteristics of the structure. In this article, the influences are discussed. First, the influences of contact and structural stiffness on the natural characteristics of the joint structure are analyzed theoretically. Considering the micro-contact between the contacting surfaces of the bolts’ connected structure, the stress diffusion between the bolt head and the disk is investigated. Then, the relationship between the tightening torque and contact stiffness, as well as the relationship between the number of tightening bolts and structural stiffness, is established. Furthermore, the relationship between assembly parameters and the natural frequencies is obtained. Hence, the regularity of the influence on the structural natural frequencies can be summarized as a consequence. The results of experiment showed that the minimum error between theoretical calculation and experimental data was 1.5%, which provides a reliable analysis tool for the investigation of vibration characteristics on the bolted disk–drum joints structure.
Highlights
Bolt connection has been widely used in the structure of aeroengine
The virtual material method was used to simulate the bolt pretightening force in the modal analysis by Huang and Jin,[3] where the simulation results of natural frequencies and vibration mode had an excellent fit with
To directly draw out the relationship between parameters of bolts joints and vibration characteristics of the bolted disk–drum joints structure, how the joint stiffness and contact stiffness are affected by the number and pretightening force of bolts is studied in this article
Summary
Bolt connection has been widely used in the structure of aeroengine. Based on the requirement of high speed and thrust–weight ratio, the connection’s influence on the aeroengine’s vibration characteristics has become increasingly important. To directly draw out the relationship between parameters of bolts joints and vibration characteristics of the bolted disk–drum joints structure, how the joint stiffness and contact stiffness are affected by the number and pretightening force of bolts is studied in this article. According to formulas (2)–(5), the stiffness of structural tangential contact and normal contact has a proportional relationship with the bolt pretightening force. The stiffness of bolted joints structure with different number of tightening bolts and torque is calculated through the FE method.[7,16,17] the tightness between the matching surfaces and structural stiffness has the proportional relationship with the pretightening force, which will affect the natural characteristics of the structure. As the number of bolts increases, the effect of pretightening force on the structural stiffness will become more obvious
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