PREDICTION OF FRACTURE OF EGGSHELL USING OPERATIONAL MODAL ANALYSIS | ||||
ERJ. Engineering Research Journal | ||||
Article 9, Volume 30, Issue 1, January 2007, Page 77-88 PDF (683.3 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/erjm.2007.69900 | ||||
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Authors | ||||
Essin A.K Amer1; . F. R Gomrr2 | ||||
1Dep~rtment ofAgriculture Engineering Faculty ofAgriculhtraZ Minoufya Universi Shibin El-Kom, EGYPT | ||||
2Department of Production Eng. & Mech Design, Faculty of Engineering Minoufya Universit Shibin El-Kom, EGYPT | ||||
Abstract | ||||
Presence of crack in eggshell are suspect able due to higher speed in commercial egg grading machines, so non-destructive quality assessment of bioproducts using vibration analysis, the resonant frequency and the damping of the vibration are the main parameters for the nondestructive quality assessment. The focus of this research is to investigate the capability af the operational modal analysis as a nondest~ctive tool, to characterize and to quantify the fracture behavior of eggshell. This is achieved by studying the response of modal testing to the variation in strength as the main factor affecting fracture. This help in correlating modal parameters to fracture behavior. Two different methods are achievedl- traditional modal analysis using transfer fnnction between actuator and sensor and 2- operational modal analysis using transmittance function between pairs of sensors, input excitation was provided through a piezoelectric force transducer bonded to the center of the cup used for egg installation in order to extract the corresponding modal parameters and damping ratio. The test for strength was performed on eggs to correlated modal parameter to behavior of f~acture. This enables the evaluation of the ability of modal testing to predict fracture using an empirical formula. The damage index based on change in transmittance function is very sensitive to change in crack length. Structural information obtained about a biomaterial at diierent length scales is important in relating the structure to its funclional properties. This knowledge and the principles behind the formation of biomaterials could be used in the attempt of bioengineering new systems. | ||||
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