Damping Prediction Technique of the Bolted Joint Structure Considering Pretension Force

Sun, Dongbai; Liao, Ridong

doi:10.2174/1874149501509010622

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…The pyroshock is attenuated as it travels through these structures, and the propagation characteristics can vary depending on the bolt load. Previous studies have shown that as the bolt load increases, the connection strength between the structures increases, resulting in higher natural frequencies and lower damping ratios due to increased stiffness (Xu and Hess, 2013; Sun and Liao, 2015; Kulkarni and Kulkarni, 2017). Therefore, the magnitude of the shock passing through bolted structures is expected to increase.…”

Section: Introductionmentioning

confidence: 99%

Characteristic study of pyroshock propagation in a structure using a pyroshock simulator

Kim,

Lee

2023

Journal of Vibration and Control

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Pyroshock is a large mechanical response with a wide frequency range that occurs instantaneously in a structure owing to the detonation of pyrotechnics or explosives. This response can cause critical damage to the surrounding electronics of aerospace systems. Therefore, designing a structure to prevent damage to electronic equipment from pyroshock is necessary. However, the characteristics of pyroshock change depending on the shape of the structure, boundary conditions, and materials; hence, it must be quantitatively analyzed. In this work, a pyroshock simulator was used for the characteristic study of shock propagation in various structures. A typical aerospace structure is a connected structure that uses rivets or bolts to connect two separate structures. Therefore, a study was conducted using numerical analysis and a shock simulator to characterize the pyroshock propagation in these joint structures. First, numerical analysis and experiments were performed by varying the bolt torque to observe the shock propagation characteristics according to the bolt load. Second, to observe the shock propagation characteristics according to the angle of the joint structure, the responses of 90°, 120°, and 180° joint structures were compared. Third, the characteristics of shock propagation through SUS304 and AL 6061-T6 were compared to observe the change in propagation characteristics due to material change. The results of investigation of the shock propagation characteristics in various structures in this study could be used to mitigate electronic equipment malfunctions due to pyroshock and in designing effective shock-attenuating structures.

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Section: Introductionmentioning

confidence: 99%

Characteristic study of pyroshock propagation in a structure using a pyroshock simulator

Kim,

Lee

2023

Journal of Vibration and Control

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An Investigation of Vibrational Characteristics of Lap Joints Using Experimental and Analytical Methods

Roberts

Cornwell

2020

Topics in Modal Analysis &Amp; Testing, Volume 8

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Frictional damping in hollow beam structures joined by bolts, rivets, and adhesive

Adams

Brearley

Nehammer

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The objective of this work was to investigate how different joining techniques affect the level of damping in structures. Beams were constructed from four different joining techniques, bolting, riveting, adhesive bonding, and brazing by joining two lengths of steel each with a ‘U’-shaped cross-section. They were joined such that the edges of the ‘U’ overlapped to form a tube. The damping of each beam was determined by flexural vibration. The bolted beam had a series of bolts along its length. The effect of removing bolts was investigated. It was found that removing bolts increased damping. When bolts were removed successively from holes at the end of the beam, the damping increased more than when bolts were removed from holes in the middle of the beam. A further objective of this project was to investigate the effect of introducing penetrant between two surfaces. WD-40 was introduced between the contacting surfaces for the beams joined by mechanical fastening. The penetrant had the effect of increasing damping. This may be because the penetrant has the effect of increasing the relative displacement between the two beams, leading to greater energy dissipation. Introducing penetrant also changed the order of which beam had the greatest damping, with the bolted beam now having greater damping than the riveted beam. The effect of increasing bolt tension on the bolted beam was also investigated. When the beams were dry, increasing bolt tension reduced the damping, but when penetrant was introduced increasing the bolt tension increased the damping. A comparison between the damping properties from different joining techniques was made. The conclusions could be applied in industry by engineers constructing beams of a similar fashion.

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Damping Prediction Technique of the Bolted Joint Structure Considering Pretension Force

Cited by 3 publications

References 13 publications

Characteristic study of pyroshock propagation in a structure using a pyroshock simulator

Characteristic study of pyroshock propagation in a structure using a pyroshock simulator

An Investigation of Vibrational Characteristics of Lap Joints Using Experimental and Analytical Methods

Frictional damping in hollow beam structures joined by bolts, rivets, and adhesive

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