1. SUDHEER KUMAR VEERNAPU - Research Scholar, Aacharya Nagarjuna University, Nagarjuna Nagar, Guntur, Andhra Pradesh, India.
Assistant Professor, Velagapudi Rama Krishna Siddhartha Engineering College, Kanuru, Vijayawada,
Krishna District, Andhra Pradesh, India.
2. NAGARAJU CHERUKURI- Professor, Velagapudi Rama Krishna Siddhartha Engineering College, Kanuru, Vijayawada, Krishna
District, Andhra Pradesh, India.
3. K VENKATRAO - Professor, Department of Mechanical Engineering, Vignan Foundation for Science, Technology and
Research University, Vadlamudi, Andhra Pradesh, India.
Vibration in rotating machinery is caused by imbalance, misalignment, mechanical looseness, shaft crack, and other malfunctions. The diagnostics of rotor faults have been gaining importance in recent years. The present work deals with the effect of input parameters namely shaft speed, crack depth and L/D ratio. To examine the vibration characteristics of cracked shaft, a steel shaft with disk mounted at its center and supported by two bearings was used. An artificial crack was introduced to detect the vibration characteristics of the rotor. Initially, the signature data was obtained with crack depths ranging from 1mm to 3mm on the rotor of 25mm diameter. The effects of input parameters were analyzed by evaluating the amplitude and Frequency of vibration in Rotor bearing system. The amplitude and frequency were measured using FFT Analyzer (Fast Fourier Transform analyzer). A high-speed Fast Fourier Transform analyzer is used to process the acousto optic emission (AOE) signals. Taguchi and Analysis of Variance (ANOVA) methods were used to identify significant input parameters affecting the system vibrations. The ANOVA was carried out at confidence level of 95%. The process parameters which are having p-value less than 0.05 were said to be significant on the response. The effect of the input parameters on the amplitude and Frequency of vibration in Horizontal and Vertical Direction were carried using Taguchy Analysis. The input parameters such as l/d ratio, shaft speed and crack depth are optimized for minimum amplitude and Frequency of shaft in Horizontal and Vertical direction using S/N ratios of the experiments. In the Taguchi method, S/N ratios were calculated for all the experiments using smaller the better characteristics.
OPTIMIZATION OF INPUT PARAMETERS IN ROTOR BEARING SYSTEM: USING TAGUCHY METHOD AND ANOVA