A Hybrid Intelligent Model for Crack Diagnosis in a Free-Free Aluminium Beam Structure

A Hybrid Intelligent Model for Crack Diagnosis in a Free-Free Aluminium Beam Structure

Sanjay K. Behera* Dayal R. Parhi Harish C. Das

Mechanical Engineering Department, Siksha ‘O’ Anusandhan Deemed to be University, Bhubaneswar, Odisha 751030, India

Robotics Laboratory, Mechanical Engineering Department, National Institute of Technology, Rourkela, Odisha 769008, India

Mechanical Engineering Department, National Institute of Technology, Shillong, Meghalaya 793003, India

Corresponding Author Email: 
sanjaybeheraoec@gmail.com
Page: 
68-77
|
DOI: 
https://doi.org/10.18280/mmc_b.870202
Received: 
3 April 2018
|
Accepted: 
17 June 2018
|
Published: 
30 June 2018
| Citation

OPEN ACCESS

Abstract: 

In a damaged beam structure, vibration characteristics like natural frequencies and mode shapes undergoes a sharp change due to presence of cracks. In the current investigation, a hybrid intelligent model has been proposed for detection of crack in an aluminium beam structure with free-free boundary conditions. A theoretical investigation has been carried out initially to mathematically model the vibrational parameters of a beam structure. The theoretical model is also supported by an experimental investigation using a free-free aluminum beam of specified dimension in presence and absence of crack. The impact of variations in crack depths and crack locations on natural frequency and mode shapes have been studied extensively. The hybrid intelligent model consisted of Fuzzy logic, Genetic algorithm and Rule based technique in different combinations. Relative natural frequencies of the beam structure are fed as inputs to the hybrid model, and relative crack depth and crack locations are generated as the outputs. Finally, the paper also gives an insight into the comparison of vibrational parameters obtained from numerical and experimental result with that of the proposed hybrid intelligent model.

Keywords: 

crack, fuzzy logic, genetic algorithm, natural frequency, rule base

1. Introduction
2. Theoretical Overview for the Determination of Vibration Characteristics of the Cracked Free-Free Beam
3. Experimental Setup
4. Results and Discussions From Numerical And Experimental Analysis
5. Fuzzy Logic
6. Genetic Algorithm
7. Adaptive Rule Base Technique
8. Proposed Hybrid Controller
9. Conclusions
Nomenclature
  References

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