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Optimizing Vehicle Assembly Line Achievement via Lean Manufacturing: An Evaluation of the Bishoftu Automotive Manufacturing Industry

Received: 9 September 2025     Accepted: 17 October 2025     Published: 3 December 2025
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Abstract

Vehicle manufacturers nowadays must contend with rising consumer demand and fierce competition for timely delivery of high-quality goods at affordable costs. But the assembly line was not productive at the required rate and capacity due to assembly line delay constraints. However, some workstations in the production line would be delayed. In the assembly line process, from the first to the last workstation, it became starving and blocking at some workstations in the assembly line due to unbalanced assembly workstation. The study aims to Optimizing Vehicle Assembly Line Achievement via Lean Manufacturing: An Evaluation of The Bishoftu Automotive Manufacturing Industry. The study was employed both qualitative and quantitative research approaches. By using those data, the current assembly line was developed with the help of lean manufacturing principles and technique among them methods, value stream map was the most important and the researcher used VSM. The most important wastes were found when the current assembly process then output was examined. Finally, optimized workstation and splitting suggested to the example company after a variety of alternative scenarios, including the current one, were performed to increase the company's production. The findings demonstrated that the first and second scenario increased the case company's bus assembly line output rate. There has been increased line efficiency by 44.65% from 19.25% to 63.9% and also production rate also increased by 0.125 unites.

Published in Industrial Engineering (Volume 9, Issue 2)
DOI 10.11648/j.ie.20250902.14
Page(s) 60-69
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2025. Published by Science Publishing Group

Keywords

Automotive Manufacturing, Assembly Line Balancing, Lean Manufacturing, Lean Thinking, Line Production Process, Cycle Time, Value Added Manufacturing

References
[1] Sayid Mia MA, Swarna NA (2018) Productivity Improvement of Leather Products Industry in Bangladesh Using Lean Tools.
[2] Africa-business, 2024. “Ethiopian Automotive Industry.’’ Africa Business Pages.
[3] James P. Womack and Daniel T. Jones (2003) LEAN THINKING BANISH WASTE AND CREATE WEALTH IN YOUR CORPORATION.
[4] Chepkania Z. L, Keraita J. N. and Muchiri P. N. (18 May 2018) Productivity Improvement in Bus Body Manufacturing Using Value Stream Mapping and Line Balancing Technique James P. Womack, Daniel T. Jones, Daniel Roos, & Donna Sammons Carpenter.
[5] Fasil Kebede (23 September 2021) Lean Manufacturing as an Automobile for Improving Productivity and Customer Satisfaction.
[6] Wenchi Shou, Jun Wang, Peng Wu & Xiangyu Wang (2020) Value adding and non-value adding activities in turnaround maintenance process: classification, validation, and benefits, Production Planning & Control.
[7] James P. Womack, Daniel T. Jones, Daniel Roos, & Donna Sammons Carpenter (1990) THE MACHINE THAT CHANGES THE WORLD.
[8] Ikhsan Siregar and Abdillah Arif Nasution (2017) Analysis of production flow process with lean manufacturing approach.
[9] Groover, M. P. (2015). Automation, Production Systems, and computer- integrated manufacturing. United States of America: Pearson Higher Education.
[10] Nuchsara Kriengkorakot and Nalin Pianthong (2007) The Assembly Line Balancing Problem: Review articles.
[11] Yuri N. Sotskov (2023) Assembly and Production Line Designing, Balancing and Scheduling with Inaccurate Data: A Survey and Perspectives.
[12] Tesfaye B. (2019 May). Productivity Improvement through Line Balancing. Adiss Abeba.
[13] Syahputri K., R M Sari, Anizar, & I Rizkya. (2017). Improving Assembly Line Balancing Using Moodie Young. The 2nd Annual Applied Science and Engineering Conference. Indonesia.
Cite This Article
  • APA Style

    Mengistu, S. A. (2025). Optimizing Vehicle Assembly Line Achievement via Lean Manufacturing: An Evaluation of the Bishoftu Automotive Manufacturing Industry. Industrial Engineering, 9(2), 60-69. https://doi.org/10.11648/j.ie.20250902.14

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    ACS Style

    Mengistu, S. A. Optimizing Vehicle Assembly Line Achievement via Lean Manufacturing: An Evaluation of the Bishoftu Automotive Manufacturing Industry. Ind. Eng. 2025, 9(2), 60-69. doi: 10.11648/j.ie.20250902.14

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    AMA Style

    Mengistu SA. Optimizing Vehicle Assembly Line Achievement via Lean Manufacturing: An Evaluation of the Bishoftu Automotive Manufacturing Industry. Ind Eng. 2025;9(2):60-69. doi: 10.11648/j.ie.20250902.14

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  • @article{10.11648/j.ie.20250902.14,
      author = {Semere Ayele Mengistu},
      title = {Optimizing Vehicle Assembly Line Achievement via Lean Manufacturing: An Evaluation of the Bishoftu Automotive Manufacturing Industry
    
    },
      journal = {Industrial Engineering},
      volume = {9},
      number = {2},
      pages = {60-69},
      doi = {10.11648/j.ie.20250902.14},
      url = {https://doi.org/10.11648/j.ie.20250902.14},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ie.20250902.14},
      abstract = {Vehicle manufacturers nowadays must contend with rising consumer demand and fierce competition for timely delivery of high-quality goods at affordable costs. But the assembly line was not productive at the required rate and capacity due to assembly line delay constraints. However, some workstations in the production line would be delayed. In the assembly line process, from the first to the last workstation, it became starving and blocking at some workstations in the assembly line due to unbalanced assembly workstation. The study aims to Optimizing Vehicle Assembly Line Achievement via Lean Manufacturing: An Evaluation of The Bishoftu Automotive Manufacturing Industry. The study was employed both qualitative and quantitative research approaches. By using those data, the current assembly line was developed with the help of lean manufacturing principles and technique among them methods, value stream map was the most important and the researcher used VSM. The most important wastes were found when the current assembly process then output was examined. Finally, optimized workstation and splitting suggested to the example company after a variety of alternative scenarios, including the current one, were performed to increase the company's production. The findings demonstrated that the first and second scenario increased the case company's bus assembly line output rate. There has been increased line efficiency by 44.65% from 19.25% to 63.9% and also production rate also increased by 0.125 unites.
    },
     year = {2025}
    }
    

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    AU  - Semere Ayele Mengistu
    Y1  - 2025/12/03
    PY  - 2025
    N1  - https://doi.org/10.11648/j.ie.20250902.14
    DO  - 10.11648/j.ie.20250902.14
    T2  - Industrial Engineering
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    JO  - Industrial Engineering
    SP  - 60
    EP  - 69
    PB  - Science Publishing Group
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    UR  - https://doi.org/10.11648/j.ie.20250902.14
    AB  - Vehicle manufacturers nowadays must contend with rising consumer demand and fierce competition for timely delivery of high-quality goods at affordable costs. But the assembly line was not productive at the required rate and capacity due to assembly line delay constraints. However, some workstations in the production line would be delayed. In the assembly line process, from the first to the last workstation, it became starving and blocking at some workstations in the assembly line due to unbalanced assembly workstation. The study aims to Optimizing Vehicle Assembly Line Achievement via Lean Manufacturing: An Evaluation of The Bishoftu Automotive Manufacturing Industry. The study was employed both qualitative and quantitative research approaches. By using those data, the current assembly line was developed with the help of lean manufacturing principles and technique among them methods, value stream map was the most important and the researcher used VSM. The most important wastes were found when the current assembly process then output was examined. Finally, optimized workstation and splitting suggested to the example company after a variety of alternative scenarios, including the current one, were performed to increase the company's production. The findings demonstrated that the first and second scenario increased the case company's bus assembly line output rate. There has been increased line efficiency by 44.65% from 19.25% to 63.9% and also production rate also increased by 0.125 unites.
    
    VL  - 9
    IS  - 2
    ER  - 

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Author Information
  • Department of Industrial Engineering, Hawassa University, Hawassa, Ethiopia; Department of Reverse Engineering, Bio and Emerging Technology Institute (BETIn), Addis Ababa, Ethiopia

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