Modeling Constraints in Design Refresh Planning

2011 ◽  
Author(s):  
Raymond Nelson ◽  
Peter Sandborn ◽  
Janis P. Terpenny ◽  
Liyu Zheng
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Planning Process ◽  
High Volume ◽  
Management Policy ◽  
Equipment Manufacturer ◽  
Technology Roadmap ◽  
Cost Impact ◽  
Low Volume ◽  
Communications System

When an original equipment manufacturer no longer supplies and/or supports a product then the product is considered to be obsolete. Obsolescence is a significant problem for systems whose operational and support life is much longer than the procurement lifetimes of their constituent components. Unlike high-volume, commercial products, which are quickly evolved, long field life, low-volume systems, such as aircraft may require updates of their components and technology called design refreshes to simply remain manufacturable and supportable. However these systems can’t perform design refreshes all the time due to the high nonrecurring and re-qualification costs. One approach to optimally managing this problem is to use DRP (Design Refresh Planning), which is a strategic method for scheduling design refreshes such that the life cycle cost impact of obsolescence is minimized. The planning of these design refreshes is restricted by various constraints, which need to be implemented into the DRP process. These constraints can reflect technology roadmap requirements, obsolescence management realities, logistical restrictions, budget ceilings and management policy. In this paper, constraints imposed on the DRP process are explored, classified within a taxonomy, and implemented in the planning process. A communications system design example is included.

Computer-Aided FT8® RAM Analysis With On Condition Maintenance

1993 ◽  
Author(s):  
T. L. Gaudette ◽  
Larry Fraser ◽  
S. A. Della Villa
Keyword(s):  
Life Cycle ◽  
Power Systems ◽  
Life Cycle Cost ◽  
Product Introduction ◽  
Marine Systems ◽  
Equipment Manufacturer ◽  
Computer Aided ◽  
Ram Analysis ◽  
Equipment Operator

Product reliability is influenced by both design and operating and maintenance practices. This means both the equipment manufacturer and the equipment’s operator have an impact on the systems’ achievable level of availability. Many variables such as application (utility or cogeneration) or service or duty cycle (peaking, cycling, or continuous duty), influence the expected availability/reliability of any unit. These variables and an understanding of the expected “economic demand” the unit must fill are important elements for a realistic and accurate reliability assessment. These variables also affect the expected maintenance costs associated with the unit. Both the equipment manufacturer and the equipment operator have a vested interest in understanding and influencing this process. If the expected level of reliability/availability is a major requirement of the equipment owner/operator, then there must be an accurate understanding of how the reliability of the unit will be protected over the long term. Thus the unit first cost and life cycle cost can be estimated in a meaningful way. The objective of this paper is to provide an assessment of proved design reliability along with the application of on condition maintenance of Turbo Power and Marine Systems’ (Turbo Power) most recent product introduction, the FT8. A computer-aided reliability analysis was made by Turbo Power with the support of Strategic Power Systems, Inc. (SPS), to demonstrate and support the suitability of the FT8 for both peaking and continuous duty applications utilizing on condition maintenance concepts. Consequently, the presentation of the RAM analysis is organized to assist in developing a complete and comprehensive understanding of the evolution of the product and to develop realistic RAM (Reliability, Availability, and Maintainability) and life cycle cost expectations.

Lebenszyklusbetrachtungen im Planungsprozess*/Life-cycle costing in the planning process - Integration of a life-cycle cost analysis for production technologies in the automotive body shop

2016 ◽  
Vol 106 (01-02) ◽  
pp. 89-93
Author(s):  
M. Bornschlegl ◽  
A. Müller ◽  
M. Bregulla ◽  
F. Mantwill ◽  
J. Franke
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Manufacturing Systems ◽  
Planning Process ◽  
Process Integration ◽  
Life Cycle Costs ◽  
Life Cycle Cost Analysis ◽  
Automotive Body ◽  
Applied Technology ◽  
Production Technologies

Die Betriebskosten von Fertigungsanlagen haben – abhängig von der jeweiligen eingesetzten Technologie – einen signifikanten Anteil an den Lebenszykluskosten. Aus diesem Grund ist es essentiell, diese bereits in der Planungsphase zu berücksichtigen, um nachhaltige Entscheidungen treffen zu können. Dabei liegt der Schwerpunkt insbesondere bei den Schulungs-, Energie- und Instandhaltungskosten. Dazu werden in diesem Fachartikel wesentliche Kostenelemente und Herausforderungen aufgezeigt.   The operating costs of manufacturing systems represent a significant part of the life-cycle costs, depending on the applied technology. For this reason, it is essential to take them into account during the planning phase in order to make sustainable decisions. The focus is mostly on costs for training, energy and maintenance. Therefore, the key cost elements and challenges are pointed out in this article.

LIFE-CYCLE COST ANALYSIS OF SOEKARNO-HATTA INTERNATIONAL AIRPORT RAIL LINK (SHIARL) USING VALUE-ENGINEERING METHOD

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Mohammed Ali Berawi ◽  
Bambang Susantono ◽  
Suyono Dikun ◽  
Tommy Ilyas ◽  
Herawati Zetha Rahman ◽  
...  
Keyword(s):  
Life Cycle ◽  
Cost Analysis ◽  
Life Cycle Cost ◽  
Flood Control ◽  
Group Discussion ◽  
High Volume ◽  
Value Engineering ◽  
Life Cycle Cost Analysis ◽  
International Airport ◽  
Private Investors

Soekarno-Hatta Airport is the main gateway for international flights, particularly to Greater Jakarta. Currently, it serves more than 44 million passengers per year, which causes accessibility problems due to the high volume of vehicles. A toll road still remains the main access to the airport, and in peak hours there is congestion and time-travel uncertainty. Soekarno-Hatta International Airport Rail Link (SHIARL) is an alternative mass-transportation project to provide accessibility and mobility for people and goods to the airport. So far, the project is still unable to attract private investors due to a lack of technical and financial feasibility. This research aims to develop a conceptual design of SHIARL by using the value-engineering approach for a comprehensive study to realize this project. This research used quantitative and qualitative methods through questionnaire surveys distributed to various stakeholders related to the project, and focus group discussion (FGD). The results identified additional functions for innovation through the integration of Mass Rapid Transit (MRT), flood control, telecommunications, and development in the downtown area of the station. These functions were then analyzed by using life-cycle cost analysis to show the value for money of the project.

Advances in Modular Design: Optimizing Mechanical Connections for Hi-Mix, Low-Volume Product Designs

2015 ◽  
Author(s):  
Mark Lesher ◽  
Guy Prendergast ◽  
Rafael Moras
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Modular Design ◽  
Rolling Stock ◽  
Heavy Duty ◽  
Design Changes ◽  
Volume Product ◽  
Design Requirements ◽  
Low Volume

In a previous study, we analyzed the life cycle cost impacts of component location changes as applied to rolling stock products [1]. Here, we present the results of an analysis that quantifies the costs of changing heavy-duty connection locations in modular fabrication designs. Modules that are fitted together usually include multiple lines of piping, cabling, and other connections, which can be problematic when the design may change due to out-of-tolerance dimensions or design requirements that change prior to installation. Also, design changes after site delivery may require frequent location changes for components that are mounted within modules. Inflexible connections internal to the module or chassis may hinder module-to-module connections in the field, where changes are difficult, hot work is dangerous, and quality of repair is dubious. The aim of this analysis was to evaluate the costs to change various types of pipe connections between modules and the costs to change component locations within modules. In addition to allowing mounting locations to be easily changed between and within modules, adjustable connection points enhance the modularization and customization of products at the lower levels of production associated with the energy, shipbuilding and rolling stock industries.

A MODEL FOR MANAGING UNDERGROUND STORAGE TANKS

1987 ◽  
Vol 1987 (1) ◽  
pp. 599-604
Author(s):  
Anne E. Smith ◽  
David Cohan ◽  
Frank Selker
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Management Strategy ◽  
Management Strategies ◽  
Data Gathering ◽  
Cost Effective ◽  
Management Policy ◽  
Decision Support Model ◽  
Tank System ◽  
Underground Tank

ABSTRACT The potential costs of underground tank leaks provide companies with a solid incentive to take action to reduce leak risks. However, a cost-effective risk management strategy is difficult to identify when faced with the uncertainties in the occurrence, nature, and timing of costly incidents. A decision support model based on the techniques of decision analysis has been developed to help managers choose the best course of action. The model works by balancing the known costs of preventive and mitigating actions with the uncertain costs of tank leaks. The model uses tank- and site-specific data to help determine how much testing or monitoring to do at each tank site, when to replace tanks, what to do in the future contingent on monitoring results, and what new tank system to install. For each strategy, the model assesses detailed outcomes such as the expected life-cycle cost of the tank system, the expected time for replacing the system, the likelihood of a leak, and the expected costs of leaks. Input data include the reliability of the tank type, its age and its previous testing results, the vulnerability of resources near the tank, and the cost and accuracy of tank-testing technologies. The underground tank management model can be valuable to tank managers. Through sensitivity analysis, it can identify those aspects of the problem that critically determine sound management rules, and the areas for further data gathering that would be most fruitful for decision making. By looking at detailed results, one can investigate the implications of each strategy for different management goals. The model helps one sound out one's own management intuition, and leads to new insights on good management strategies. Initial model results have led to important insights. Leak costs are often a significant fraction of total life-cycle costs. The optimal management policy is thus quite sensitive to the characteristics of the tank site and the type of tank. Hence, a single management strategy applied to all types of tanks and sites may be detrimental to the tank owner's overall costs.

Sign in / Sign up

Export Citation Format

Share Document