Study on mode shape curvature in Aluminum 6061 using cubic polynomial regression method based on experimental data

Nor Halim, Aida Syahirah (2019) Study on mode shape curvature in Aluminum 6061 using cubic polynomial regression method based on experimental data. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Gapped smoothing method (GSM) are the most popular non-destructive testing (NDT) method due to its simplicity and did not require baseline data for comparisons. However, GSM are less accurate to detect wide size of damage in structure and cause false detection. The objective of this study is to detect crack size of 0.5 to 5 inch in the specimen and to construct a numerical analysis for undamaged and damaged of a mode shape curvature structure while the scope of this study are using Microsoft Excel software for the calculation of damaged and undamaged mode shape curvature and the last one are by comparing the numerical analysis result that obtain from both experiment and simulation for damaged and undamaged mode shape curvature. Vibration base damage detection are a method that includes the mode shape curvature studies, natural frequency and also damping ratio. The mode shape curvature will be analyze by using finite element which occur three different method such as forward, central and backward difference, and cubic polynomial regression. Finite element analysis (FEA) on a free boundary condition on a steel beam was carried out to demonstrate the feasibility of the proposed method that estimate undamaged curvature mode shape data using this 2 numerical analysis

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