Evaluation of MF399 tractor steering hydraulic pump defects using frequency analysis of vibration signals
Subject Areas :
Keywords: Defect, Frequency Analysis, vibrations, Gear hydraulic pump,
Abstract :
Behrooz Ahmadi1 and Davood Mohammadzamani2* 1-2- Dep.Of Biosystems Engineering, Islamic Azad University, Takestan Branch, Takestan, Iran *Coresponding author:dr.dmzamani@gmail.com Using the frequency spectrum related to the vibrations of machine components to determine the amount and location of component defects is one of the new methods in the process of electronic vibration measurement. The purpose of this study was to determine the defects related to the main components of the hydraulic pump of the two-stage tractor MF399 by analyzing the frequency spectrum of vibrations obtained by the electronic vibration measurement system. In order to measure the vibrations, a laboratory table was designed and the components of the measuring system, the hydraulic pump of the MF399 tractor and the electric motor were installed on it. Tests were performed at three speed levels of 350, 700 and 1000 rpm for the input shaft of the hydraulic pump in a healthy pump and a defective pump. Defects on the gear included 25, 50 and 100% pitting on the first floor of the idler gear and pitting of the idler gear on the second floor of the pump. Data collection was performed by Vibrotest model VT60. The results of data analysis in the field of frequency and time showed that in all test modes with a healthy pump, with increasing rotational speed or in other words, increasing the frequency, the vibration damping of the first floor of the pump decreased so that with increasing rotational speed to 1000 RPM, the vibration amplitude decreased to less than 0.01 m.s-2. The results showed a similar trend for the second floor shell of the pump. The results also showed that with increasing pitting in the gears from zero to 100% pitting, the vibration amplitude of the spectrum decreased. Therefore, this criterion can be used as a model in diagnosing defective teeth of hydraulic pump gears.
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