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Increasing levels of noise and vibration are early indicators for an evoluting error or defect on an electrical machine. There are many different approaches in monitoring the health of an electrical machine, e.g. noise-, vibration- or current-based methods. This paper investigates and compares different methods for noise analysis. Each method provides an own representation of the analysed signal....
Bearing is one of the most critical components of rotating machinery. They are employed to support and rotate the shafts in rotating machinery. Therefore; any fault in the bearings can lead to losses on the level of production and equipments as well as the creation of an unsafe working environment for humans. For that reason, the bearing fault diagnosis has received considerable attention from the...
Determination of the lunar driving road excitation is the basis of analysis of lunar rover vibration. In this paper, initially, the vertical acceleration signals of lunar in two different roads are collected. Based on the obtained vertical acceleration signals, acceleration power spectrums of the signals are solved by the use of AR model. Additionally, displacement power spectrums are obtained according...
A mechanical system shows always unstable, non-Gaussian and nonlinear characteristics to some extent, especially when the system suffer from defect, therefore it is difficult for conventional vibration analysis based on Fourier transform to find weak fault information. High-order spectral analysis (HOSA) provides a more effective tool. In this paper bispectrum and 1(1\2)-dimension spectrum were used...
Vibration analysis is an important route for improving the driving smoothness and stability of lunar rover. The structure characteristic of the eight-wheel lunar rover with tension-bar and rocker structure is that the ground flatness inputs of each two wheels hinged by the same rocker are intercoupling. The ground flatness excitation is equivalently transformed, which is the main excitation source,...
Faulty bearings generate impulsive vibrations during operation and this provides the basis for bearing fault detection by vibration measurement and analysis. However, in a situation where a mechanical system produces strong impulsive vibrations by its nature even when the system is in good condition, the traditional impulse detection based method for bearing fault diagnosis become ineffective. To...
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