Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
A DIDACTIC TEST-RIG TO TEACH VIBRATION MODES
Submission Author:
Iago Pereira , MG
Co-Authors:
Iago Pereira, Valder Steffen Jr, Aldemir Ap Cavalini Jr, Leandro Leão, Vergílio Torezan Silingardi Del Claro, Fabrício Vieira de Oliveira
Presenter: Iago Pereira
doi://10.26678/ABCM.COBEM2019.COB2019-1668
Abstract
The gap between what is taught at undergraduate classes and what is required in engineering practice often brews disinterest and hinders the students understanding of the subject. In the last couple of decades, many engineering colleges have heavily implemented experimental classes in their schedules to approximate concepts presented in class to practical problems. To this goal, many simple designs can be explored as didactic examples to real engineering problems. Such systems should be portable, present high vibration amplitudes and/or movement ranges, and operate at low frequencies to be easily understood. In this context, a didactic test-rig design is presented, favoring the understanding of mechanical vibration modes. The proposed experiment enables the students to witness string vibration modes as a function of an engine rotation speed, which is synchronized with LED lights. As a result, a strobe effect is created, allowing clear visualization of the first few mode shapes. The use of this experiment during undergraduate engineering classes increased the interest of the students and promotes a better understanding of physical and practical concepts. The final test-rig is portable, low-cost, and easy to be reproduced.
Keywords
mechanical vibrations, Experimental design, learning method, didactic test-rig
