A lifecycle cost-driven system dynamics approach for considering additive re-manufacturing or repair in aero-engine component design

Aero-engine component design decisions should consider re-manufacturing and/or repair strategies and their impact on lifecycle cost. Existing design approaches do not account for alternative production technologies such as the use of additive manufacturing in life extension processes. This paper presents a modeling and optimization methodology for examining the impact of design decisions in the early development stage on component lifecycle cost during the in-service phase while considering the potential use of additive manufacturing in life extension strategies. Specifically, a system dynamics model is developed to assess different end-of-life scenarios. Finally, an optimization problem is formulated and solved to minimize lifecycle cost with respect to design variables related to remanufacturing

Lifecycle Cost Evaluation of Flexible Facility Designs

The purpose of this research is to ascertain the type of facility design, standard, robust, or flexible, that yields the greatest lower lifecycle costs (LCC) savings to the USAF. To this aim, the researcher constructed a Monte Carlo simulation to determine the LCC for flexible, robust, and standard administrative facility designs for thousands of potential facility lifecycles. The simulation also illustrates the circumstances under which each type of design would result in the lowest LCC. The results of this research will show the USAF the importance of focusing on LCC and designing flexible facilities. Standard and robust designs are the staples of the current practice. This research found implementing flexible facility design into practice is advantageous to the United States Air Force (USAF) for two key reasons: (1) Flexible designs allows USAF facilities to easily adapt to changes in user demands and, (2) when compared to both standard and robust designs, flexible designs have LCC

Nuclear Smuggling Detection and Deterrence Lifecycle Cost Modeling

There is a variety of equipment that is used to detect and deter nuclear smuggling at airports, seaports, and at borders. Every piece of equipment has two types of maintenance activities, preventive and corrective, that need to be performed in order for the equipment to function accurately. A model of the lifecycle cost for the equipment’s preventive and corrective maintenance is represented using Microsoft Excel’s Solver, What-if Analysis, and Visual Basic and Applications (VBA) programming in order to maximize the maintenance activities under specific constraints. The global optimal solution of the maximum number of activities will be used to help country’s determine how many activities they can do based on a budget. In the model, there are two preventive maintenance activities of functional check and physical inspect. There are two corrective maintenance activities of network repair and workshop repair. The preventive maintenance frequencies, 1, 2, 4, 6, and 12, will change if the budget of the activities falls below/exceeds the maintenance budget. The Microsoft Excel’s What-If Analysis tool is used to calculate the overall budget cost of all maintenance activities. Based on the possible solutions, those that equaled the maintenance budget, their frequencies were used in Solver to determine if it is the optimal solution. When the VBA programming was used, Solver was coded in multiple loops and programed to copy and paste all table charts on a spreadsheet. By using two different approaches, 16 out of 25 solutions were feasible. The solutions with the most maintenance activities would be chosen but only if it used the entire budget. However, there are many deciding variables to consider when deciding the optimal solution. The next step to this research would be to consult subject matter experts on the maintenance equipment in order to better understand each country’s maintenance needs

Total Ownership with Lifecycle Cost Model Under Uncertainty

NPS NRP Executive SummaryTotal Ownership with Lifecycle Cost Model Under UncertaintyN9 - Warfare SystemsThis research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Total Ownership with Lifecycle Cost Model Under Uncertainty

NPS NRP Technical ReportTotal Ownership with Lifecycle Cost Model Under UncertaintyN9 - Warfare SystemsThis research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Total Ownership with Lifecycle Cost Model Under Uncertainty

NPS NRP Project PosterTotal Ownership with Lifecycle Cost Model Under UncertaintyN9 - Warfare SystemsThis research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrpChief of Naval Operations (CNO)Approved for public release. Distribution is unlimited.

Lifecycle information for e-literature: a summary from the LIFE project.

The LIFE Project has developed a methodology to calculate the long-term costs and future requirements of the preservation of digital assets. LIFE has achieved this by analysing and comparing three different digital collections and by applying a lifecycle approach to each. From this work LIFE has identified a number of strategic issues and common needs. The critical strategic issues are: •There is a need for a wider collaborative approach between Higher Education (HE) and Libraries to aid in the cost-effective development of tools and methods. •The time required for the realistic development of the next generation of these tools and methodologies is largely unknown and should form part of a collective responsibility within the digital preservation community. •There exists a real opportunity to establish long-term partnerships between institutions to address common requirements. The challenge is to establish multidisciplinary Project teams and programmes to lead these developments. •There exists a real opportunity to establish long-term partnerships between institutions and industry to develop this methodology and to establish new opportunities to share knowledge and experience. The LIFE project could become an important vehicle for the development of these new opportunities

Lifecycle information for e-literature: full report from the LIFE project

This Report is a record of the LIFE Project. The Project has been run for one year and its aim is to deliver crucial information about the cost and management of digital material. This information should then in turn be able to be applied to any institution that has an interest in preserving and providing access to electronic collections. The Project is a joint venture between The British Library and UCL Library Services. The Project is funded by JISC under programme area (i) as listed in paragraph 16 of the JISC 4/04 circular- Institutional Management Support and Collaboration and as such has set requirements and outcomes which must be met and the Project has done its best to do so. Where the Project has been unable to answer specific questions, strong recommendations have been made for future Project work to do so. The outcomes of this Project are expected to be a practical set of guidelines and a framework within which costs can be applied to digital collections in order to answer the following questions: • What is the long term cost of preserving digital material; • Who is going to do it; • What are the long term costs for a library in HE/FE to partner with another institution to carry out long term archiving; • What are the comparative long-term costs of a paper and digital copy of the same publication; • At what point will there be sufficient confidence in the stability and maturity of digital preservation to switch from paper for publications available in parallel formats; • What are the relative risks of digital versus paper archiving. The Project has attempted to answer these questions by using a developing lifecycle methodology and three diverse collections of digital content. The LIFE Project team chose UCL e-journals, BL Web Archiving and the BL VDEP digital collections to provide a strong challenge to the methodology as well as to help reach the key Project aim of attributing long term cost to digital collections. The results from the Case Studies and the Project findings are both surprising and illuminating

Reducing Project Lifecycle Cost with an Integrated Safety Lifecycle Suite

PresentationThe international functional safety standard IEC 61511 provides the safety lifecycle as a steadfast guideline to assess and mitigate risk for manufacturing processes including refineries, chemical, petrochemical, pulp and paper, and power plants. To achieve a functionally safe system, it is essential to follow each requirement in the standard. However, consistent execution is difficult to achieve and often depends on the tools used to perform analysis and specification of the safety instrumented system. The need for a consistent work process was fulfilled with a fully integrated safety lifecycle software suite. Lifecycle tools often include a module for each stage of the safety lifecycle. Use of the full suite ensures quality assessment and execution of a safety instrumented system, as well as compliance to the safety standard. An integrated tool would also streamline these tasks, easily transferring data from one module to another to save the user time and money. In this paper, the benefit of using an integrated safety lifecycle tool versus use of excel spreadsheets or other in-house tools is quantified. The intent is to show how users of the software reduce the number of engineering hours, and therefore dollars spent, for each safety lifecycle task. It is assumed that all required information is available when needed. Through conservative estimates, this paper proves that it pays to use an integrated tool to support your safety lifecycle tasks and to make safety a priority