The mechanism of EEMD is first introduced. The fault characteristics of the signal are extracted by the Hilbert transform. The energy of decomposition signal shows a suddenly variation when crack occurs. Hilbert-Huang transform HHT is a very effective time-frequency analysis method, but it has some disadvantages. In this paper use the local mean decomposition theory to analysis hard target penetration acceleration signals. According to industry experiences, vibration fatigue of socket welds is becoming one of the major ageing issues. Use local mean decomposition to separate the rigid projectile overload from hard target penetration acceleration signals. Mechatronics and Applied Mechanics II.
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– The Weld Fatigue app can create results for life, damage, safety factor and stress range along all the weld sections in the model. – Nominal, Hot-Spot. For Hot-Spot method this gives a clear view of the fatigue results along the welds to identify critical points (and not only in a single point if using a manual. PDF | At welded joints, fatigue cracks usually initiate either at the with fatigue tests, thus giving insight into the practical application and This IIW-document was basis of the paper published in Welding in the World, Vol.
The fault diagnostic case of roller bearing shows the effectiveness of the proposed method. The algorithm can select wavelet transform to realize the best noise reduction effect in a self-adaptive way according to the characteristic of signal containing noise and signal to noise ratio.
Then using EEMD to improve the HHT method, decompose the denoising signal into a series of different time scales component of intrinsic mode functions.
This paper researches fault feature extraction method based on singular value decomposition and the improved HHT method for non-stationary characteristics of wind turbine gearbox vibration signal. The mechanism of EEMD is first introduced. Local mean decomposition can adaptively decompose any complex non-stationary signal into a number of physically meaningful instantaneous frequency components and these components could well reflect the intrinsic nature of the signals.
At last, simulation experiment and engineering application are made, and their results are compared with the decomposition result of Daubechies wavelet.
The application of mean stress effect is defined, including an important example fatigue stress range for stress normal and parallel to the weld. N/mm2. ΔσHS.
App.C. — Changes in Figure C and Figure C • App.D.
— 5 S-N curves (B1B2, C, C1 and C2) . Stresses at girth welds in pipes and S-N data.
The acceleration response signal is acquired and decomposed by wavelet method.
The paper analyzes the difference between useful signal and noise signal in dissemination characteristic inside wavelet space in manufacturing engineering, and then puts forward a search algorithm based on wavelet decorrelation white noise testing and involved with the parameters in a parametric equation. Small bore pipes with socket welds are installed on the vibrating table and vibrate at the frequencies that near its first natural frequency.
Applied Mechanics and Materials Volumes Experimental study on bearing vibration signal analysis verified its effectiveness of EEMD for machine health monitoring and defect diagnosis.
For example, the dense modal signal cannot be decomposed completely, and redundancy intrinsic mode functions IMFs are easy emerging at low frequency, which will cause the distortion of the processing results. In this paper use the local mean decomposition theory to analysis hard target penetration acceleration signals.
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|This paper investigates its utility for machine health monitoring and defect diagnosis.
Finally, simulating gearbox fault experiment to verify the effectively of the proposed method. The energy of decomposition signal shows a suddenly variation when crack occurs. This paper researches fault feature extraction method based on singular value decomposition and the improved HHT method for non-stationary characteristics of wind turbine gearbox vibration signal.
According to industry experiences, vibration fatigue of socket welds is becoming one of the major ageing issues.
Applied Mechanics and Materials Volumes Hard target penetration acceleration signals are non-stationary signals.