Implementing the Surface Response to Excitation Method (SuRE) with Non-contact Sensors

González, Marcos; Sergio, Raymundo

doi:10.25148/etd.fi13120613

DOI: 10.25148/etd.fi13120613

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Implementing the Surface Response to Excitation Method (SuRE) with Non-contact Sensors

Marcos González¹,

Raymundo Sergio²

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“…The SLV uses the Doppler effect to measure the surface oscillations and its sensing mechanism is illustrated in Figure 1-5. The method has proved to be effective in detecting a variety of structural defects, including tool wear [31], loose bolts [32] and compressive loads in beam [33] and plate [34] structures. The SuRE method requires a separate sensor in addition to the piezoelectric actuator.…”

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Development of New Structural Health Monitoring Techniques

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During the past two decades, many researchers have developed methods for the detection of structural defects at the early stages to operate the aerospace vehicles safely and to reduce the operating costs. The Surface Response to Excitation (SuRE) method is one of these approaches developed at FIU to reduce the cost and size of the equipment.The SuRE method excites the surface at a series of frequencies and monitors the propagation characteristics of the generated waves. The amplitude of the waves reaching to any point on the surface varies with frequency; however, it remains consistent as long as the integrity and strain distribution on the part is consistent. These spectral characteristics change when cracks develop or the strain distribution changes. The SHM methods may be used for many applications, from the detection of loose screws to the monitoring of manufacturing operations.A scanning laser vibrometer was used in this study to investigate the characteristics of the spectral changes at different points on the parts. The study started with detecting a load on a plate and estimating its location. The modifications on the part with manufacturing operations were detected and the Part-Based Manufacturing Process vii Performance Monitoring (PbPPM) method was developed. Hardware was prepared to demonstrate the feasibility of the proposed methods in real time.Using low-cost piezoelectric elements and the non-contact scanning laser vibrometer successfully, the data was collected for the SuRE and PbPPM methods.Locational force, loose bolts and material loss could be easily detected by comparing the spectral characteristics of the arriving waves. On-line methods used fast computational methods for estimating the spectrum and detecting the changing operational conditions from sum of the squares of the variations. Neural networks classified the spectrums when the desktop -DSP combination was used. The results demonstrated the feasibility of the SuRE and PbPPM methods.

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Development of New Structural Health Monitoring Techniques

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Implementing the Surface Response to Excitation Method (SuRE) with Non-contact Sensors

Cited by 1 publication

References 29 publications

Development of New Structural Health Monitoring Techniques

Development of New Structural Health Monitoring Techniques

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