Abstract
In maintenance systems, the current approach to workforce analysis entails the utilisation of metrics that focus exclusively on workforce cost and productivity. This method omits the “green” concept, which principally hinges on energy-efficient manufacturing and also ignores the production-maintenance integration. The approach is not accurate and could not be heavily relied upon for sound maintenance decisions. Consequently, comprehensive, scientifically-motivated, cost–effective and environmentally-conscious approaches are needed. With this in view, a deviation from the traditional approach through employing a combined fuzzy, quality function deployment interacting with three meta-heuristics (colliding bodies’ optimisation, big-bang big-crunch and particle swarm optimisation) for optimisation is made in the current study. The workforce size parameters are determined by maximising workforce size’s earned-valued as well as electric power efficiency maximisation subject to various real-life constraints. The efficacy and robustness of the model is tested with data from an aluminium products manufacturing system operating in a developing country. The results obtained indicate that the proposed colliding bodies’ optimisation framework is effective in comparison with other techniques. This implies that the proposed methodology potentially displays tremendous benefit of conserving energy, thus aiding environmental preservation and cost of energy savings. The principal novelty of the paper is the uniquely new method of quantifying the energy savings contributions of the maintenance workforce.
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Appendix
Appendix
1.1 Section A
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1.
What is the number of products produced?
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2.
What is the average weekly production volume of each product?
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3.
Do your company outsource production activities?
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4.
If yes, what is the average weekly volume of each product that is outsourced?
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5.
What is the unit cost of outsourced product?
1.2 Section B
In this section, information on evaluation of the performance of a production system is required. The set of selected questions are presented below, while the rating system for these questions is given as follows:
Grade | Interpretation |
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Low | Less than 40% |
Medium | 41–60% |
High | 61–80% |
Very high | Above 80% |
S/n | Questions for responses | Low | Medium | High | Very high |
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1 | How will you rate production workers idle time in your company? | ||||
2 | How will you rate maintenance workers idle time in your company? | ||||
3 | How will you rate machine efficiency in your company? | ||||
4 | How will you rate machine utilisation in your company? | ||||
5 | How will you rate machine availability in your company? | ||||
6 | How will you rate machine reliability in your company? | ||||
7 | How will you rate production workers efficiency in your company? | ||||
8 | How will you rate maintenance workers utilisation in your company? | ||||
9 | How will you rate maintenance workers efficiency in your company? | ||||
10 | How will you rate production workers utilisation in your company? | ||||
11 | How will you rate workers turnover rate in your company? |
1.3 Section C
In this section, the range of some resources used during weekly production activities is required. Kindly assist us in providing information for the following set of questions:
S/No. | Questions for responses |
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1 | What is the range of weekly full-time production workers? |
2 | What is the range of weekly full-time maintenance workers? |
3 | What is the range of weekly causal production workers? |
4 | What is the range of weekly causal maintenance workers? |
5 | What is the range weekly production? |
6 | What is the range of weekly breakdown time? |
7 | What is the range of weekly production cost? |
8 | What is the range of weekly maintenance cost? |
9 | What is the range of weekly cost of spares? |
10 | What is the range of weekly workforce cost/? |
12 | What is the range of weekly maintenance? |
13 | What is the range of weekly production time? |
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Ighravwe, D.E., Oke, S.A. A manufacturing system energy-efficient optimisation model for maintenance-production workforce size determination using integrated fuzzy logic and quality function deployment approach. Int J Syst Assur Eng Manag 8, 683–703 (2017). https://doi.org/10.1007/s13198-016-0555-7
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DOI: https://doi.org/10.1007/s13198-016-0555-7