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Questions and Answers
What do deterministic techniques assume about maintenance workload and other parameters?
What type of techniques are more representative of real life due to the existence of uncertainty?
What is used to identify the probability distributions that best describe random variables in stochastic capacity planning?
What type of models consider various uncertainties present in real-life maintenance systems?
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What type of technique is used to analyze the uncertainty in maintenance capacity planning?
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What is a characteristic of stochastic models for maintenance capacity planning?
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What are two examples of stochastic techniques mentioned in the text?
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What is a difficulty in constructing and solving stochastic models for capacity planning?
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What type of models assume that maintenance workload and capacity are known constants?
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What do uncertainties in maintenance surround, according to the text?
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Study Notes
Maintenance Scheduling Challenges
- Maintenance activities are uncertain in terms of duration and resource requirements
- Maintenance activities are highly related in terms of precedence relations or relative priority
- Tasks can be divided into subtasks each with different requirements
- Tasks can be interrupted or canceled due to changes in production conditions or maintenance requirements
Project Scheduling and Maintenance
- Project management techniques can be utilized for scheduling the maintenance operations
- Two primary network programming techniques used in project scheduling are: • Critical Path Method (CPM) • Program Evaluation and Review Technique (PERT)
Performance Measurement and Maintenance
- Maintenance Performance Measurement (MPM) is a multidisciplinary process of measuring and justifying the value created by maintenance investment
- MPM takes into account the organization's stockholder's requirements viewed strategically from the overall business perspective
Maintenance Workload Forecasting and Capacity Planning
- Carrying out an effective maintenance operation requires efficient planning of maintenance activities and resources
- Maintenance workload consists of two major components: • Scheduled and planned preventive maintenance • Emergency breakdown failure maintenance
Maintenance Forecasting
- Forecasts of the future maintenance workload are needed to plan well for maintenance resources
- Forecasts are typically classified into three main types: • Short-term (days to weeks) • Intermediate-term (weeks to months) • Long-term (months to years)
Maintenance Capacity Planning
- The main objective is to assign fixed maintenance capacity (resources) to meet fluctuating maintenance workload
- Capacity planning determines the appropriate level and workload assignment of different maintenance resources in each planning period
- Examples of maintenance resources include spare parts, manpower, tools, instruments, time, and money
- Capacity planning decisions include the number of employees, the backlog level, overtime workload, and subcontract workload
Capacity Planning Strategies
- Four basic strategies to match the fixed capacity with fluctuating monthly demands: • Chase strategy • Leveling strategy • Demand management • Subcontracting
- Hybrid strategies are generally considered the best approach
Capacity Planning Techniques
- Deterministic techniques assume that the maintenance workload and all other significant parameters are known constants
- Two deterministic techniques: • Modified transportation tableau method • Mathematical programming
- Stochastic capacity planning techniques assume that the maintenance workload and possibly available capacity and other relevant parameters are random variables
- Two examples of stochastic techniques: • Queuing models • Stochastic simulation
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Description
Explore the limitations of scheduling theory in maintenance scheduling due to the unique characteristics of maintenance activities. Learn about the uncertainties, precedence relations, and interruptibility of tasks that make maintenance scheduling complex.
