Four Stroke Diesel Engine Vibrational Analysis using FFT Analyzer

In every diesel engine there is vibration due to reciprocating component, rotating component, unidirectional combustion forces, structural resonance etc. Vibration is an effective tool in detecting and diagnosing some of the incipient failures of machine and equipment. Vibration signature measured on the external surface of the machine or a structure contains a good amount of information, which if properly interpreted, can reveal the running condition of the machine. So, as per standard it is necessary to analyze the vibration and Noise. In this paper vibration testing of single cylinder diesel engine by using FFT (Fast Fourier Transform) is carried out. Numbers of readings to measure mean vibration and noise levels in a single cylinder diesel engine for different cooling water temperatures have been taken. It was seen that a variation in the water temperature affects the mean vibration values. This effect was considered sufficient to require a control of temperature when conducting investigations on other sources or causes of engine vibration. ADASH 4400 – VA4Pro FFT analyzer with Accelerometer is used for vibration testing. Vibration accelerometer is mounted on the cylinder head vertically to record the engine vibrations in RUN- UP mode of FFT Analyzer which directly gives the spectral data.