Wavelets pp 83-101 | Cite as

Wavelet-Based Multiscale Enveloping

  • Robert X. Gao
  • Ruqiang Yan


The use of enveloping technique has been found in many engineering fields. For example, enveloping is employed for the detection of ultrasonic signals, as seen in nondestructive testing (McGonnagle 1966; Greguss 1980; Liang et al 2006). It also presents a complementary tool to spectral analysis in detecting structural defects in rolling bearings (e.g., surface spalling) and gearbox (e.g., broken teeth) (Tse et al 2001; Wang 2001). Generally, three steps are involved in envelope extraction, as illustrated in Fig. 6.1. First, the measured signal passes through a band-pass filter with its bandwidth covering the high-frequency components of interest.


Injection Molding Pulse Train Wavelet Coefficient Vibration Signal Ultrasonic Pulse 
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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUniversity of ConnecticutStorrsUSA
  2. 2.School of Instrument Science and EngineeringSoutheast UniversityNanjingChina, People’s Republic

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