Analytical and Numerical Study of Critical Speed for Right Shafts

In this paper it is presented the theoretical, experimental and numerical simulation of critical speed for right shafts. For this purpose, it is designed a virtual model of a test bench for shaft critical speed analysis. The studied shaft is mounted on two bearings and on the middle it has mounted a heavy disc. The system has the possibility to modify the shaft speed with a frontal friction continuous variable transmission. It is presented a mathematical model to calculate the critical speed of the shaft. The result obtained by analytical calculation is verified by experimental way and by numerical simulation. The simulation of shaft flexibility is achieved in ADAMS multibody software and obtained results are presented and discussed. Shaft experimental flexional deformations and the results obtained by numerical simulation are similar. Study of shaft flexibility by numerical simulation in ADAMS is an easy tool and very important for practical application to avoid resonance in elastic mechanical systems.