Characterisation of Vibration Sigsnals Using Continuous Wavelet Transform for Condition Assessment of on-Load Tap-Changers

Kang, Pengju; Birtwhistle, David

doi:10.1006/mssp.2002.1525

Cited by 23 publications

(13 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Local maxima of the CWT are extracted and the vertical ridges corresponding to maxima are plotted. Transient strengths were then estimated using integration of CWT coefficients along the ridges as described by Kang and Birtwhistle (2003) and compared to fracture detection level. Table 1 shows the list of the fractures detected after palpation, no fracture being detected after shoulder tests.…”

Section: Methodsmentioning

confidence: 99%

Transient detection using wavelet: application to rib cage fractures

Gabrielli¹,

Subit

Masson³

2009

Computer Methods in Biomechanics and Biomedical Engineering

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Transient detection using wavelet: application to rib cage fractures

Gabrielli¹,

Subit

Masson³

2009

Computer Methods in Biomechanics and Biomedical Engineering

View full text Add to dashboard Cite

“…It is adapted from a methodology proposed by Antoine et al [18] and Kang and Birtwhistle [19]. The strength of a transient is defined as the integral of the module of the CWT from the finest scale (corresponding to the maximum frequency) up to a cut-off scale a c (corresponding to a cut-off frequency f c ):…”

Section: Time-scale Analysismentioning

confidence: 99%

Time-frequency analysis to detect bone fracture in impact biomechanics. Application to the thorax

Gabrielli¹,

Subit²,

Ogam³

et al. 2009

Medical Engineering & Physics

View full text Add to dashboard Cite

Experimental testing is a major source of data to quantify the tolerance of the human body to impact and to develop protection strategies. Correlating the time of rib fractures with the kinematics of the occupant and the action of safety systems would provide valuable data for assessing safety systems and developing injury risk functions. However, methods for determining rib fractures timing are not yet fully developed. Time-history analysis of data from multiple strain gauges mounted directly to ribs is commonly used for this purpose, but this method is not very sensitive and the time and cost required to instrument the rib cage with more than 100 strain gauges is prohibitive for many applications. In this study a new approach based on time-scale analysis of signals obtained from piezoelectric transducers (PZT) is reported. A post-mortem human subject was instrumented with four PZT on ribs 3 and 7 bilaterally and exposed to lateral blunt impacts to the shoulder and the chest. The fractures were documented after each test, and a criterion was developed to process the PZT signals. The criterion consists in detecting in the PZT signal the onset of a high frequency transient generated by the fracture of a rib using the continuous wavelet transform. Two thresholds were successfully determined to detect fractures that occurred (1) on an instrumented rib, and (2) on the adjacent rib. Further development of this method should allow the detection of all rib fractures using only a few PZT.

show abstract

“…This method can improve the visibility of OLTC's mechanical operation for an effective online condition monitoring. With respect to theoretical research, Kang et al [7] present an OLTC vibration signal characterization technique using the continuous wavelet transform (CTW), and the essential features from the original signals are extracted to provide reliable indications of the health of the equipment. Mikheev et al [8] propose a new method of oscillography to evaluate the contactor parameters of SDV-type on-load tap changers with opened tank and partial removal of transformer oil.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Finite Element Model Updating for On-load Tap Changer based on Super-model

Liu¹,

Zou²,

Miao

et al. 2019

MATEC Web Conf.

View full text Add to dashboard Cite

A method is presented for dynamic model updating of on-load tap changer (OLTC). Based on a sensitivity-based optimization method, the initial simplified finite element (FE) model of OLTC component is updated using the analytical results of the FE super-model. The objective of model updating is to reduce the frequency difference between the simplified FE model and the super-model, and to make the simplified model accurately represent dynamic characteristics of the super-model. The updated simplified models can be further used in the modeling and analysis of the whole OLTC model. The results, taking the base of OLTC as example, indicate that the dynamic behavior of the updated simplified model match well with that of the super-model. Subsequently, the dynamic behavior of OLTC assembled with the updated parts is further predicted by modal analysis. The presented method improves the calculation efficiency, as well as accuracy, which has broad application prospects for dynamic prediction of complex structures in engineering. 2, 0 (2019) MATEC Web of Conferences

show abstract

Characterisation of Vibration Sigsnals Using Continuous Wavelet Transform for Condition Assessment of on-Load Tap-Changers

Cited by 23 publications

References 9 publications

Transient detection using wavelet: application to rib cage fractures

Transient detection using wavelet: application to rib cage fractures

Time-frequency analysis to detect bone fracture in impact biomechanics. Application to the thorax

Dynamic Finite Element Model Updating for On-load Tap Changer based on Super-model

Contact Info

Product

Resources

About