Crack Simulations in Shaft-Hub-Blade System using Modal Analysis
K. Ravi Prakash Babu1, Pothamsetty Kasi V Rao2, Md. Abid Ali3 and B. Raghu Kumar4
1K. Ravi Prakash Babu, Department of Mechanical Engineering, Prasad V Potluri Siddhartha Institute of Technology, Kanuru, Vijayawada, India.
2Pothamsetty Kasi V Rao, Department of Mechanical Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur, India.
3Md. Abid Ali, Department of Mechanical Engineering, Potti Sriramulu Chalavadi Mallikarjuna Rao College of Engineering and Technology, Kothapeta, Vijayawada, India.
4B. Raghu Kumar, Department of Mechanical Engineering, Prasad V Potluri Siddhartha Institute of Technology, Kanuru, Vijayawada, India.
Manuscript received on 06 April 2019 | Revised Manuscript received on 11 May 2019 | Manuscript published on 30 May 2019 | PP: 2646-2650 | Volume-8 Issue-1, May 2019 | Retrieval Number: A1303058119/19©BEIESP
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Abstract: Mostly turbo machines encounter failures like cracks, unbalance, mechanical looseness, misalignment, etc. as they are subjected to fatigue loads. Any of these failure conditions lead to change in the dynamic behavior of these machines. The shaft assembled with hub and blades is considered as the turbo machine rotor for which vibrations response is analyzed. This work includes modal analysis of shaft-hub-blade system with crack developed either in the shaft or in the blade. Analysis was carried out using ANSYS software to evaluate natural frequencies and mode shapes for the healthy and cracked conditions of the system. From the analysis, it was observed that the presence of crack in any component of the system has appreciable effect on the natural frequencies of the system. But the decrease in the natural frequencies of the system is more for the crack located in the shaft compared to that of crack present in the blade. So it is evident that the vibration response of the individual components of the shaft-hub-blade system needs to be measured to identify the actual cracked component.
Index Terms: Crack Simulation, Finite Element Analysis, Natural Frequencies, Shaft-Hub-Blade System.

Scope of the Article: Software Domain Modelling and Analysis