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This paper introduces a novel method of measuring vibration displacement using three axes accelerometer, which effectively overcomes the shortcomings of traditional measurement method based on single axis accelerometer. Firstly, the frequency domain method is used to remove the trend items and noises in the three axes acceleration signals. Then, the three axes accelerations are fused for the resultant...
The vibration analysis is widely used in industry as an efficient tool to monitoring equipments integrity and its structures. The vibration monitoring usually is a task which include large and expansive equipments. Recently, micro eletromechanical systems (MEMS) accelerometers devices has been used successfully in this purpose, having results each more times significant. The present work shows a low-cost...
Fault detection using a vibration signal is considered to be one of the most important methods applied to rotating parts. Most of the rotating machine faults can be detected by this technique before dangerous situations occur. Although the vibration signal is easy to be measured and recorded, its analysis is by no means simple. Moreover, when applying this technique to a real object in the field,...
Electronic assemblies often experience multiaxial vibration environments in use and tall, heavy components are more vulnerable under such loading than are short, light components. The added vulnerability comes from higher response due to nonlinear dynamic amplification of the response under simultaneous multiaxial excitation, termed multi degree of freedom (MDoF) excitation. This paper investigates...
Failures on a rolling bearing in the gearbox drive system can be detected via vibration sensors or accelerometers. Measured signals include rotating harmonics, noises, signals associated with a bearing fault. Characteristic frequencies of a faulty bearing are very close to the higher harmonics of rotor frequency. This causes a big challenge to know if a bearing is in a faulty or healthy condition...
This paper shows an experimental study about a mechanical vibration analysis technique that can be useful for monitoring mobile rotary systems in order to find a way to characterize critical parts of the system, and by this mean to create the possibility to assure its proper function. A passenger car has been used to develop a test that consisted of using a sensor to acquire the vibrations on an specific...
A wavelength division sensing RF vibrometer which is implemented as a tunable carrier frequency Doppler radar sensor was used for the first time to accurately measure mechanical vibrations of complex patterns. The amplitude ratio of a pair of baseband harmonics under different carrier wavelengths was used to obtain the vibration patterns. A software-controlled PLL was built to generate carrier frequencies...
In this paper it is shown that the problem of applying active control to a simple elastic plate structure can be introduced in a form which allows the application of optimal control theory. In particular, a modal model for the vibration of an elastic structure and the state space realization of this model are given. In the first part of the paper a modal analysis of the structure is introduced and...
A new method to fault diagnosis of bearing based on order tracking technique and autoregressive (AR) spectrum is presented. Firstly, the transient vibration signals during run-up condition of gearbox are re-sampled using order tracking technique. Therefore, the time domain transient signals are transformed into angle domain stationary signals. Then the AR model estimation is applied to angle domain...
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