Fatigue Life and Modal Analysis of Centrifugal Fan's Impeller in Portable Pneumatic Extinguisher for Forest Fires
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Abstract
The centrifugal fan used in a Portable Pneumatic Extinguisher (PPE) designed for forest fires is a high-speed rotating machine that is vulnerable to vibrations, which can ultimately lead to system failure. Therefore, fatigue and modal analysis of the fan are crucial in the design and development process to prevent premature failure. Previous work optimized the PPE impeller design with the inner blade angle set to 64°, the outlet blade angle to 120°, and the number of blades to 24. However, fatigue analysis and modal analysis were not considered. Thus, this study examined the fatigue life and modal behavior of the impeller in a centrifugal fan used in a PPE, utilizing the Finite Element Analysis (FEA) method. The results showed that the impeller experienced a maximum von Mises stress of 26.4 MPa, with a maximum deformation of 3.07 × 10⁻⁴ mm in the section with the highest stress. The minimum deformation was 1.52 × 10⁻⁶ mm, and the maximum displacement recorded was 0.056 mm. Fatigue life analysis indicated minimal or no visible damage to the impeller. Modal analysis revealed that the lowest frequency was 150.8 Hz, approximately 22.6% lower than the natural frequency, suggesting that resonance is unlikely under normal operating conditions. Overall, the impeller design demonstrated sufficient structural integrity and fatigue life for the PPE's intended use in forest fire applications.
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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