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Acadlore takes over the publication of IJCMEM from 2025 Vol. 13, No. 3. The preceding volumes were published under a CC BY 4.0 license by the previous owner, and displayed here as agreed between Acadlore and the previous owner. ✯ : This issue/volume is not published by Acadlore.

Open Access
Research article

Enhancing the Life of Mechanical Systems Such As Refrigerator in Rail Transit Based on Life-Stress Model and Sample Size Formulation

Seong-Woo Woo1,
Dennis L. O’Neal2,
Yimer Mohammed Hassen1,
Gezae Mebrahtu1
1
Faculty of Mechanical Engineering, Ethiopian Technical University, Ethiopia
2
Department of Mechanical Engineering, School of Engineering and Computer Science, Baylor University, USA
International Journal of Computational Methods and Experimental Measurements
|
Volume 10, Issue 4, 2022
|
Pages 385-397
Received: N/A,
Revised: N/A,
Accepted: N/A,
Available online: 11-28-2022
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Abstract:

Parametric accelerated life testing (ALT) with the reliability quantitative (RQ) specifications is recommended as reliability methodology to pinpoint design flaws and correct them in transit. It covers (1) cycles of an accumulated failure rate of X% (BX) lifetime with ALT strategy, (2) fatigue design, (3) ALTs with alterations, and (4) discernment if design(s) obtains targeted BX life. The quantum/transport-based (generalized) life-stress failure prototype and sample size formulation for generating RQ specifications were suggested. The equivalent elevated damage potential in parametric ALT was applied, represented by field power spectral density. A case study was used to evaluate a refrigerator fatigued during rail. In first ALT, for RQ specifications – 40 min, refrigerator tubes made of ethylene propylene diene monomer rubber fractured because of mount designs. The failed shape in first ALT was alike to those of the field refrigerator. After mounts and tubes were redesigned, there were no difficulties during second ALT. Refrigerator was assured to fulfill a B1 lifetime for travel distance.

Keywords: Design flaws, Fatigue, Parametric accelerated life testing, Quantum/transport-based life-stress model, Random vibration, Sample size equation
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Woo, S. W., O’Neal, D. L., Hassen, Y. M., & Mebrahtu, G. (2022). Enhancing the Life of Mechanical Systems Such As Refrigerator in Rail Transit Based on Life-Stress Model and Sample Size Formulation. Int. J. Comput. Methods Exp. Meas., 10(4), 385-397. https://doi.org/10.2495/CMEM-V10-N4-385-397
S. W. Woo, D. L. O’Neal, Y. M. Hassen, and G. Mebrahtu, "Enhancing the Life of Mechanical Systems Such As Refrigerator in Rail Transit Based on Life-Stress Model and Sample Size Formulation," Int. J. Comput. Methods Exp. Meas., vol. 10, no. 4, pp. 385-397, 2022. https://doi.org/10.2495/CMEM-V10-N4-385-397
@research-article{Woo2022EnhancingTL,
title={Enhancing the Life of Mechanical Systems Such As Refrigerator in Rail Transit Based on Life-Stress Model and Sample Size Formulation},
author={Seong-Woo Woo and Dennis L. O’Neal and Yimer Mohammed Hassen and Gezae Mebrahtu},
journal={International Journal of Computational Methods and Experimental Measurements},
year={2022},
page={385-397},
doi={https://doi.org/10.2495/CMEM-V10-N4-385-397}
}
Seong-Woo Woo, et al. "Enhancing the Life of Mechanical Systems Such As Refrigerator in Rail Transit Based on Life-Stress Model and Sample Size Formulation." International Journal of Computational Methods and Experimental Measurements, v 10, pp 385-397. doi: https://doi.org/10.2495/CMEM-V10-N4-385-397
Seong-Woo Woo, Dennis L. O’Neal, Yimer Mohammed Hassen and Gezae Mebrahtu. "Enhancing the Life of Mechanical Systems Such As Refrigerator in Rail Transit Based on Life-Stress Model and Sample Size Formulation." International Journal of Computational Methods and Experimental Measurements, 10, (2022): 385-397. doi: https://doi.org/10.2495/CMEM-V10-N4-385-397
WOO S W， O’NEAL D L， HASSEN Y M， et al. Enhancing the Life of Mechanical Systems Such As Refrigerator in Rail Transit Based on Life-Stress Model and Sample Size Formulation[J]. International Journal of Computational Methods and Experimental Measurements， 2022， 10(4)： 385-397. https://doi.org/10.2495/CMEM-V10-N4-385-397