International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 07 | Jul 2023
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p-ISSN: 2395-0072
Experimental Investigation of Faults in Roller Element Bearing Using Vibration Based Method Shankar G. Rane¹, Jayesh R. Satam¹, Prasad R. Mejare¹, Hrutik M. Salkar¹, S. S. Kulkarni² 1- Students, Dept. of Mechanical Engineering, SSPM College of Engineering, Kankavli, Maharashtra, India. 2- Dept. Mechanical Engineering, SSPM College of Engineering, Kankavli, Maharashtra, India. ---------------------------------------------------------------------***--------------------------------------------------------------------2. EXPERIMENTATION Abstract - The development of small, localized pits causes distributed faults in rolling element bearings. This raises the cost of maintaining industrial machinery by causing rotor systems to fail prematurely or even catastrophically if not promptly monitored. This study proposed a technique for diagnosing rolling element bearings using vibration analysis (VS) to find distributed problems. The internal experimental test rig was created and constructed to allow for the experimental investigation of the vibrational properties of distributed faults. Analytical models are contrasted with experimental outcomes. Here, the threshold life of any bearing may be predicted after the introduction of the flaw.
The proposed experimental setup shown in fig. no.2 is rotor bearing system used for study. Numbers of experiments were executed and validated with Analytical results. 2.1. Design of Setup - Calculation: To apply same loading condition, we choose disc of steel with diameter 150 mm and thickness having 5 mm. D = 150 mm t = 5 mm V = π/4*(r2) t = π/4*(0.0752) *0.005 = 0.0000221 m³ Ρ = m\v m = ρ*v = 7850*0.0000221 = 0.1735 N m = 1.702 kg F = m*g = 1.702*9.81 = 16.69 N Ꞇ = F*L = 16.697*0.29 Here L = 0.29m Ꞇ = 4.84 Nm P = 2πNꞆ/60 P = 2π*1440*4084/60 P = 729.85 W P = 0.72985 KW P = 0.978 hp
Here, localized and spread defects are compared, and the vibrational signatures of both are correlated with healthy bearings. This study offers a method for estimating the bearing life following the introduction of a fault. Key Words: Bearing failure, life of bearing, vibration-based analysis, etc.
1.INTRODUCTION The number of rotations a bearing can withstand before failing due to rolling fatigue or failure of the inner ring, outer ring, or rolling element (ball or roller) are two ways that the service life of a bearing is stated. When equipment or a machine component fails under the prescribed conditions of use as stipulated by its manufacturer, it is said to have reached the end of its rated life. The bearing's service life is different from its rated life because it may fail due to improper lubrication, misalignment, and mounting damage before it reaches its real life.
Therefore, we select motor having 1 HP power and 1440 RPM. Shaft Calculation: Power of Motor P = 1 Hp = 0.746 Kw N = 1440 rpm Syt value of steel = 265 N/mm2 FOS (Factor of Safety) = 3 ςt = Syt/FOS =265/3 σt =88.33 N/mm2 Ꞇ = 0.5Syt/FOS =0.5×265/3 Ꞇ =44.165 N/mm2 A) Shaft is subjected to pure bending load: ςt = ςb = Mb×Y/ I = Mb/(π/64)d4 ×(d/2)
The bearing's mounted accelerometer collects data, which is then analyzed on an FFT analyzer. Separating undesired data from other energy sources within the machine is a crucial component of processing. By incorporating selective digital filtering into the software, this is accomplished. In this study, data from damaged and undamaged bearings are compared to pinpoint the flaw. After a set amount of time, the bearings are regularly monitored to see if they are operating within acceptable limits.
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