Engine Assembly Quality Defect Inspection Based on EMD-Envelope Spectra
| Autor: | Yi Min Shao, Wei Jun Ye |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Crankshaft
Engineering business.industry Noise (signal processing) Mechanical Engineering Acoustics education Structural engineering Signal Hilbert–Huang transform law.invention Vibration Quality (physics) Mechanics of Materials law General Materials Science Connecting rod business Envelope (motion) |
| Zdroj: | Key Engineering Materials. :962-969 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.569-570.962 |
| Popis: | As the complicate structure and unstable working condition, the vibration signal of engines always be non-stationary and drown in strong noise, especially for the case of slight quality defection. Such case directly results in difficulties for inspection and diagnosis of engine incipient defection. A new inspecting method based on empirical mode decomposition (EMD) and envelope spectrum is proposed in this paper. In the new method, the intrinsic mode functions (IMF) of de-noised angular vibration signals are firstly obtained; then the envelope spectrums of IMFs are obtained through envelope analysis, lastly the discrepancy of the envelope spectrums between normal and abnormal case is extracted to be the feature indicator for the engine quality inspection. This method is validated experimentally. The results show that the proposed method has an excellent performance in the quality inspecting in the presence of abnormal clearance between crankshaft and connecting rod of the engine. |
| Databáze: | OpenAIRE |
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