A review on vibration analysis of crankshaft
Abstract
Crankshaft is mechanical component with a complex geometry which does the transformation of reciprocating motion into rotational motion. It converts the reciprocating displacement of the piston in to a rotary motion of the crank. The life of crankshaft depends on its strength to wear stress and loads. Any defect in the crankshaft (e.g. cracks, notch) deteriorates the performance of the engine. In this paper, a brief review of the importance of analyzing crankshaft by means of vibration analysis which forms an integral parts in almost all the fields is done.
Keywords
Crankshaft, ANSYS Software, Vibration analysis, crankshaft defect, fast Fourier transform, condition monitoring
I. INTRODUCTION…show more content… Vibrations play a vital role in all the fields of life. In the human anatomy, the vocal cords need to vibrate for voice to be generated, the lungs need to vibrate for proper breathing, the leg muscles must vibrate conveniently for legitimate walking. In the engineering fields of machines, generators, pumps, turbines, aerospace, electrical and electronics also vibration analysis play an important role. The research on vibration analysis involves a complete study of such vibrating systems and the effects of vibration on those…show more content… However, it can be separated into dozens to hundreds sections according to the structure characteristics upon analysis demand. It can calculate high order torsional vibration frequencies that can’t be determined by simply mass model, and also avoids the large amount of computation that required in the calculation of continuous mass model. Thus it has been widely used.
Soft body dynamics model is used the calculation of flexible multi-body dynamics, flexible body is described as modal flexible body. A flexible body contains a series of modals.
The finite element method is a numerical method that can be used for the accurate solution of complex mechanical and structural vibration problems. In this method, the actual structure is replaced by several pieces or elements, each of which is assumed to behave as a continuous structural member called a finite element.
In [1] K. Thriveni, Dr. B. JayaChandraiah performed the modelling on the crankshaft and the configuration of the engine to which the crankshaft belongs are: (35)
Force on the piston: Bore diameter
(D) =53.73mm,
FQ = Area of the bore ×Max. Combustion pressure
In order to find the Thrust Force acting on the connecting rod (FQ), and the angle of inclination of the connecting rod with the line of stroke (i.e. angle Ø).
Which implies = 8.24⁰
We know that thrust Force in the connecting