Bolt Preload Loss Due to Modal Excitation of a C-Beam Structure

Miller, Max; Johnson, Chris R.; Sonne, Noah; Philip, Mersch, John; Kuether, Robert J.; Smith, Jeff; Ortiz, Jonel; Moore, Kate

doi:10.1007/978-3-030-47626-7_30

Cited by 1 publication

(2 citation statements)

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“…This occurs at the resonant frequency of the structure. The resonant frequency, f res is affected by the mass, m and stiffness, k of the structure as mathematically described in Equation (1). As the number of loosened bolts increase or the tightness of the bolt joints decrease, the structure will experience a reduction in stiffness.…”

Section: Resonance Frequency Methodsmentioning

confidence: 99%

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Feasibility of using low‐sampled accelerometer measurements for bolt joint looseness detection

Nicholas

Mills

Song

et al. 2022

IET Renewable Power Gen

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In this work, the feasibility of using low-sampled vibration signals for bolt joint tightness detection was investigated. Testing was carried out on multiple bolt joint configurations using a bench top electrodynamic shaker rig. Two data-processing methods were successfully used to deduce bolt joint loosening from the accelerometer measurements, namely the resonant frequency and regression methods (ARX and AR-ARX). Both methods were able to detect loosening of bolt joints, however, the latter possesses higher sensitivity in detecting the position of the loosened bolt among an array of bolts. As the resonant frequency of wind turbines is low (0.35-2 Hz), the minimum sampling rate for bolt joint tightness detection is consequently also low (twice the resonant frequency). This facilitates potential use of existing accelerometer instrumentation on wind turbines, typically sampled at low rates.

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Section: Resonance Frequency Methodsmentioning

confidence: 99%

“…They, however, possess an inherent flaw as they are prone to self-loosening. Loosening can be defined as a subsequent loss of preload following the completion of its tightening procedure [1]. The mechanism for bolt loosening is divided into two: rotational or non-rotational loosening [2].…”

Section: Introductionmentioning

confidence: 99%