Authors: Pradip G. Gavade, Vivek V. Patil
Abstract: This study presents an experimental investigation of vibration localization in flexible rotating shafts under simply supported boundary conditions. Three shaft configurations were considered: circular stainless steel 304, non-circular stainless steel 304, and circular brass. The experimental program used an accelerometer, impact hammer, FFT analyzer, DC motor, coupling, and bearing supports to determine the natural frequencies and steady-state vibration responses. The non-circular shaft introduced a small difference between the two lateral moments of inertia; therefore, it represents a mistuned configuration. The experimental natural frequencies of 85.23 Hz, 89.84 Hz, and 75.78 Hz were obtained for circular stainless steel, non-circular stainless steel, and circular brass were 85.23, 89.84, and 75.78 Hz, respectively. The normalized forced responses increased with rotational speed, demonstrating the sensitivity of the vibration response to rotational speed and structural asymmetry. At 1000, 2000, and 3000 rpm, normalized responses of 0.03384, 0.18, and 0.5259 were obtained for circular stainless steel; 0.03565, 0.159, and 0.448 for non-circular stainless steel; and 0.0508, 0.2398, and 0.7706 for circular brass.
DOI: http://doi.org/10.5281/zenodo.22791683
