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Vol. 147, No. 12, December 2012, pp. 45-52

 

Bullet

 

Study of Vibration Characteristics of a Multi Cracked Rotating Shaft Using Piezoelectric Sensor
 

RAJEEV RANJAN, N. K. MANDAL

Department of Mechanical Engineering

National Institute of Technical Teachers’ Training and Research, Kolkata-700106, India

E-mail: rajeevranjan.br@gmail.com, mandal_nirmal@yahoo.com

 

 

Received: 23 May 2012   /Accepted: 18 December 2012   /Published: 31 December 2012

Digital Sensors and Sensor Sysstems

 

Abstract: Dynamic behavior of a structure changes due to presence of crack. Scientific analysis of such phenomena can be utilized for fault diagnosis and detection of cracks in structures. In this paper attempts have been made to detect the cracks of a mild steel rotating shaft. Theoretical expressions have been developed for determining natural frequencies and mode shapes for rotating shaft using flexibility influence coefficients and local stiffness matrix. The numerical results for the beams having ‘no’ crack, 'single' crack and ‘two’ cracks are compared. It is observed from the numerical results that, there are appreciable changes in vibration characteristics of the rotating shaft with and without cracks which can be utilized for multi crack identification of structures.

 

Keywords: Rotor, Natural frequency, Multiple cracks, Vibrations, PicoScope

 

 

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