Perpustakaan Digital ITB

Shaft misalignment is a major cause of rotating machinery failure, and dial indicator-based measurement is commonly used for its detection. In this system, the dial indicator is mounted on a cantilever beam, whose deformation under loading may affect measurement performance. Previous studies have mainly focused on improving sensor and laser-based measurement accuracy, while the structural performance of the supporting beam has received less attention. Therefore, this study aims to reduce beam deformation through geometry optimization without changing the material for beam lengths of 140 mm, 160 mm, and 180 mm. A prismatic cantilever beam was first modeled in ANSYS Workbench 2025 R1 and validated using Euler–Bernoulli beam theory. A non-prismatic beam was then parametrized using two geometric variables: the height near the free end, ranging from 6-10 mm, and the height at the fixed support, ranging from 14-18 mm. Response Surface Optimization was performed using a Central Composite Design consisting of nine design points for each beam length. The maximum total deformation was used as the response variable to identify the optimum geometry. The results showed that deformation consistently decreased as both geometric parameters increased, with the height at the fixed support having a greater influence than the height near the free end. The optimum geometry within the investigated parameter range occurred at the upper bound of both parameters, resulting in maximum total deformation values of 5.08 ?m, 7.80 ?m, and 10.38 ?m for beam lengths of 140 mm, 160 mm, and 180 mm, respectively. These results show a deformation reduction of approximately 33% compared with the initial configuration, indicating that geometry optimization can effectively reduce deformation and improve the structural performance of the supporting beam.