Dynamic characteristics of rectangular twisted beam with fins surrounded with fluid

This study investigates the vibration characteristics of rectangular twisted beam and the safety assessment of the potential for fretting-wear damages caused by foreign object. To get the natural frequency, corresponding mode shape and participation factor, modal analyses are performed for a twisted beam with fins submerged in fluid of hexagonal cylinder. Special emphases are on the effects of fins, boundary conditions at both ends, fluid surrounding the beam and the number of turns on the modal characteristics, which are expressed in terms of the natural frequency and corresponding mode shape. Also, the wear rate caused by foreign object is calculated using the Archard formula and the remaining life of the beam is predicted.