An Assessment of Joint Rigidity with Ultrasonic Wave Energy

Montoya, Angela C.; Maji, Arup

doi:10.1007/s10921-011-0098-4

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…However, a large number of smart washers are required in applying the detection method to a TPS with hundreds of bolts, because each bolt should be installed with a smart washer. Similar wave energy dissipation-based methods were studied by Montoya and Maji [12] and Wang et al [13]. It is known that the nonlinear contact mechanics on the joint interface can cause nonlinear transmission of guided waves.…”

Section: Introductionmentioning

confidence: 78%

A Modified Time Reversal Method for Guided Wave Detection of Bolt Loosening in Simulated Thermal Protection System Panels

et al. 2018

Complexity

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In this work, a modified time reversal method is proposed for guided wave detection and localizing loosened bolt in a complicated multibolt-jointed structure. Different from the traditional time reversal guided wave method, the response signal due to a tone burst input received at the healthy state is time reversed and recorded as a standard reemitting signal. In the detection process, this recorded standard signal is used for all damage cases to yield time reversal-focalized reconstruction signals. This largely improves the sensitivity of the focalized signal to damage state. In this paper, the peak amplitude of the focalized wave packet in the reconstructed signal is calculated and utilized as tightness index. By bonding PZT transducers at different joint locations inside the structure, multiple tightness indices, where each tightness index presents the correlation between the current joint condition to its healthy condition at the joint, can be obtained. To analyze a large number of tightness indices, a principle component analysis method is introduced, and a neural network-based loosening detection method is proposed. The proposed method is experimentally validated in a simulated double-layer bolt-jointed thermal protection system panel. Experimental results illustrate that the proposed method is effective to identify and localized the bolt loosening in complicated multibolt-jointed structure. The detection and identification of the location of multibolt loosening is realized.

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Section: Introductionmentioning

confidence: 78%

A Modified Time Reversal Method for Guided Wave Detection of Bolt Loosening in Simulated Thermal Protection System Panels

et al. 2018

Complexity

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“…Montoya et al [32] assessed the rigidity of L-shaped bolt joint using transmitted wave energy. Subsequently, Montoya et al [33] further extended the method to bolt loosening and preload monitoring of satellite panels jointed by a right angle bracket.…”

Section: Wave Energy Dissipationmentioning

confidence: 99%

Structural Health Monitoring of Bolted Joints Using Guided Waves: A Review

Du¹,

Xu²,

Ren³

et al. 2018

Structural Health Monitoring From Sensing to Processing

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Bolted joints are widely applied in engineering structures. Significant advantages of bolted joints are that they can be easily disassembled and the possibility to design for bearing large working load. However, in practical applications, preload loss in pre-tensioned bolts is inevitable. Reliable detection of bolt loosening is significant to ensure structural reliability and safety. In the past decades, the guided wave-based structural health monitoring (SHM) methods have been developed for the detection of bolt loosening, and considerable advancements have been made in this area. This chapter presents a review of the existing studies on bolt preload monitoring method based on guided wave. The basic principle and characteristics of the typical methods are discussed, which involve wave energy dissipation, time reversal guided wave, contact acoustic nonlinearity, and active chaotic ultrasonic excitation-based methods. In addition, this chapter presents an experimental comparison of the detection sensitivity of wave energy dissipation and time reversal method. The results show that the TR method is more sensitive to bolt loosening.

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“…However, the fuzzy sets of torque level are limited, and the signal processing procedure is complicated. Montoya et al [ 29 ] assessed rigidity of L-shaped bolt joint using transmitted wave energy. Then, Montoya et al [ 30 ] further extended the method to bolt loosening and preload monitoring of satellite panels jointed by right angle bracket.…”

Section: Introductionmentioning

confidence: 99%

Preload Monitoring of Bolted L-Shaped Lap Joints Using Virtual Time Reversal Method

et al. 2018

Sensors

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L-shaped bolt lap joints are commonly used in aerospace and civil structures. However, bolt joints are frequently subjected to loosening, and this has a significant effect on the safety and reliability of these structures. Therefore, bolt preload monitoring is very important, especially at the early stage of loosening. In this paper, a virtual time reversal guided wave method is presented to monitor preload of bolted L-shaped lap joints accurately and simply. In this method, a referenced reemitting signal (RRS) is extracted from the bolted structure in fully tightened condition. Then the RRS is utilized as the excitation signal for the bolted structure in loosening states, and the normalized peak amplitude of refocused wave packet is used as the tightness index (TIA). The proposed method is experimentally validated by L-shaped bolt joints with single and multiple bolts. Moreover, the selections of guided wave frequency and tightness index are also discussed. The results demonstrate that the relationship between TIA and bolt preload is linear. The detection sensitivity is improved significantly compared with time reversal (TR) method, particularly when bolt loosening is at its embryo stage. The results also show that TR method is an effective method for detection of the number of loosening bolts.

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An Assessment of Joint Rigidity with Ultrasonic Wave Energy

Cited by 9 publications

References 14 publications

A Modified Time Reversal Method for Guided Wave Detection of Bolt Loosening in Simulated Thermal Protection System Panels

A Modified Time Reversal Method for Guided Wave Detection of Bolt Loosening in Simulated Thermal Protection System Panels

Structural Health Monitoring of Bolted Joints Using Guided Waves: A Review

Preload Monitoring of Bolted L-Shaped Lap Joints Using Virtual Time Reversal Method

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