Comparative Vacuum Monitoring (CVM™) as an Alternate Means Of Compliance (AMOC)

Wheatley, Greg; Kollgaard, Jeffrey R.; Register, J.; Zaidi, Mazhar

doi:10.1784/insi.47.3.153.61318

Cited by 15 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the sake of structural safety and more economic benefits, structural health monitoring (SHM) has been perceived as one of the most prosperous technologies for aerospace, marine, and civil infrastructural fields. 4,5 Several SHM technologies, including global/local vibration, 6 acoustic emission, 7 acoustic ultrasonics, 8 electro-mechanical impedance, 9 , 10 comparative vacuum monitoring, 11 intelligent coating monitoring, 12 and so on, have been used for damage detection of bolted joints. There are some reports about eddy current (EC) sensors, as SHM techniques, suitable for damage monitoring of bolt hole.…”

Section: Introductionmentioning

confidence: 99%

A two-dimensional eddy current array–based sensing film for estimating failure modes and tracking damage growth of bolted joints

Sun

Wang

Liu

et al. 2019

Structural Health Monitoring

View full text Add to dashboard Cite

Bolted joints are the key components for enduring primary load and play a vital role in ensuring structural safety for aircrafts. But it is very difficult to analyze the strength and failure modes of bolted joints due to their complexity and nonlinear coupling factors. Therefore, it is greatly essential to estimate potential failure mode at the early age and quantitatively track the damage parameters for calculating residual life and determining structural integrity. In this article, the concept of two-dimensional eddy current array–based sensing film is proposed to estimate the failure modes by identifying the circumferential location of the damage around the bolt hole and quantitatively track the damage parameters including the damage size in the radial direction and the damage depth in the axial direction of bolt hole. Finite element simulation is utilized to study the interaction between eddy current signals and the damage, and optimize the configuration of sensing film. Simulation result shows that a noticeable difference of eddy current signals of sensing film can be clearly seen that damage is located at different circumferential location around the hole. In addition, the exciting coil with opposite current directions at the boundary of axially adjacent coils has a better capacity of differentiating the damage sizes in the radial and axial direction than that with same current directions. The experiment is conducted to demonstrate the effectiveness of the proposed sensing film for estimating fatigue modes and quantitatively tracking damage growth.

show abstract

Section: Introductionmentioning

confidence: 99%

A two-dimensional eddy current array–based sensing film for estimating failure modes and tracking damage growth of bolted joints

Sun

Wang

Liu

et al. 2019

Structural Health Monitoring

View full text Add to dashboard Cite

show abstract

“…Such a weight penalty is unaffordable on a weight-sensitive structure, such as for fighter jets. Another promising technique is the Comparative Vacuum Monitoring (CVM) sensors 11,12 . The CVM sensor consists of a series of low vacuum and pressurized channels.…”

Section: Introductionmentioning

confidence: 99%

Multiplexing wireless antenna sensors for crack growth monitoring

Huang

2011

SPIE Proceedings

View full text Add to dashboard Cite

This paper presents the multiplexing of unpowered wireless antenna sensors for crack monitoring at multiple locations. Four antenna sensors were multiplexed to form a sensor array based on two multiplexing principles, namely frequency division and spatial division. For frequency division, a dual-antenna sensor array with each sensor operating at different frequencies was designed and implemented. Simultaneous interrogation of these two sensor elements has been achieved. For spatial division, two single antenna sensors with the same resonant frequencies as the dual-antenna sensor array were installed at different locations. By steering the illumination light toward their wireless impedance-switch circuits, these two single antenna sensors can be interrogated individually. The capability of the antenna sensor array to monitor multiple crack growth in a fatigue specimen was evaluated. Compared to a single antenna sensor, the antenna sensor array enables us to track the status of cracks over a large area.

show abstract

“…Some other SHM technologies, including intelligent coating monitoring (ICM), comparative vacuum monitoring (CVM), acoustic emission, and vibro-acoustic modulation, can also be used to inspect bolted joint damage. [18][19][20][21] However, the majority of these techniques focus on metal materials or surface crack detection without accurately tracking the damage position. They may also be applicable for identifying different failure modes of composite bolted joints under service.…”

Section: Introductionmentioning

confidence: 99%

On-site monitoring of bearing failure in composite bolted joints using built-in eddy current sensing film

Liu

Sun

Chai

et al. 2020

Journal of Composite Materials

View full text Add to dashboard Cite

Bearing damage is one of the common failure modes in composite bolted joints. This paper describes the development of an on-site monitoring method based on eddy current (EC) sensing film to monitor the bearing damage in carbon fiber reinforced plastic (CFRP) single-lap bolted joints under tensile testing. Configuration design and operating principles of EC array sensing film are demonstrated. A series of numerical simulations are conducted to analyze the variation of EC when the bearing failure occurs around the bolt hole. The results of damage detection in the horizontal direction and through the thickness direction in the bolt hole with different exciting current directions are presented by the finite element method (FEM). Experiments are performed to prove the feasibility of the proposed EC array sensing film when the bearing failure occurs in CFRP single-lap bolted joints. The results of numerical simulations and experiments indicate that bearing failure can be detected according to the variation of EC in the test specimen.

show abstract

Comparative Vacuum Monitoring (CVM™) as an Alternate Means Of Compliance (AMOC)

Cited by 15 publications

References 0 publications

A two-dimensional eddy current array–based sensing film for estimating failure modes and tracking damage growth of bolted joints

A two-dimensional eddy current array–based sensing film for estimating failure modes and tracking damage growth of bolted joints

Multiplexing wireless antenna sensors for crack growth monitoring

On-site monitoring of bearing failure in composite bolted joints using built-in eddy current sensing film

Contact Info

Product

Resources

About