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With characteristics analysis of the vibration signal from the diesel engine, a new method for identifying the characteristic frequency band is put forward by adopting its IMF component. The diesel engine vibration signals are disposed by using EMD method and the IMF components with respond to the main interference factors is eliminated. Then, the true vibration signal from diesel engine could be...
Wind turbine gearbox is one of the high failure rate components in wind turbine system, and various signal processing methods for vibration signals of gearbox to detect fault has obtained good results. In this paper, the structure characteristic of wind turbine gearbox is analyzed and the principle of defection modulation of gearbox vibration signals is studied. The method of cepstrum and Hilbert...
The acoustic signal of a mechanical watch movement consists of many modal frequencies of its escapement. However, the traditional methods neglected such valuable information which is in frequency domain. This paper presents a method for the signature analysis of mechanical watch movements by combining reassigned scalogram with finite element analysis (FEA). First, reassigned scalogram is applied to...
The state-of-the-art advancement in wind turbine condition monitoring and fault diagnosis for the recent several years is reviewed. Since the existing surveys on wind turbine condition monitoring cover the literatures up to 2006, this review aims to report the most recent advances in the past three years, with primary focus on gearbox and bearing, rotor and blades, generator and power electronics,...
Motor prognosis has great benefit for motion control systems. It is desirable to develop the so-called integrated prognosis capability for motion control products, i.e. with only the existing sensors of a motor drive. This paper presents a scheme of integrated wear prognosis for linear actuators driven by AC servo motor with only current measurement. The hidden semi-Markov model (HSMM) was adopted...
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