It specifically focuses on the equipment design features, tasks, or procedures that impact equipment downtime, repair costs, labor hours, and maintainer skill level requirements. Introduction the final goal for a delivered system whether a car, aircraft, avionics box or computer should be its availability to operate and perform its intended function over its expected design life. Maintenance world an article source for reliability and maintenance management professionals. Handbook of reliability, availability, maintainability and safety in engineering design not only encompasses a depth of research into engineering design methods and techniques ranging from quantitative probability theory and expert judgement in bayesian analysis to qualitative possibility theory, fuzzy logic and uncertainty in markov analysis. To be fair, however, many techniques for loose coupling do tend to rely on abstractions that introduce more classes into your application, and when application logic is spread throughout multiple files, that may actually make code more difficult to follow than just having everything in one place. Handbook of reliability, availability, maintainability and safety in engineering design studies the combination of various methods of designing for reliability, availability, maintainability and safety, as well as the latest techniques in probability and possibility modelling, mathematical algorithmic modelling, evolutionary algorithmic modelling, symbolic logic modelling, artificial. Maintainability is a requirement of the cei and swci specifications. There are a number of principles, approaches and techniques that can help you develop maintainable software. Ram is a subset of rams which also includes safety.
Maintainability design checklist for underground equipment niosh mining safety and health research 10 of 28 4. The example in figure 42 shows a coke formation pdf in the furnace of a distillation plant. Design for maintainability articles plant maintenance. Ram refers to three related characteristics of a system and its operational support. Some practical principles for design of maintainable systems.
The original application was a version of the familiar j2ee petstore application, defined by a rigorous functional specification. The program is written in c and runs on debian linux kernel. The following is a maintainability design checklist for coal mining equipment. Pdf product maintainability design method and support tool. Maintainability maintenance is the activity of modifying a software product after initial delivery. The original application was a version of the familiar j2ee petstore application, defined. The stage 1 design phase shall be concurrent with or following the design phase for the roadway. This concept however, has received little attention by the building designers especially those in developing countries. Across all domains interview with il director, jim gardener.
For any design team, the end user is both the operational. This publication is a comprehensive package comprised of maintainability best practices in use today, a model process, and tools to help the user implement these best. Design reduces to a minimum the number of spare parts and components required to support maintenance. It specifically focuses on the identification of equipment design features. An introduction to human factors in medical devices. Beers, office of device evaluation andrew lowery, office of health and industry programs stephen m. It may have been my lack of experience or improper tools. The maintainability advantage needs to be understood also as part of securing company investment in training. Reliability, availability, and maintainability ram analysis.
Designing for supportability driving reliability, availability, and maintainability in. Organizational maintenanceintermediate maintenance depot, supplier, or manufacture maintenance. An introduction to human factors in medical devices by dick sawyer office of health and industry programs cdrh work group. Download an introduction to reliability and maintainability. Once youre finished, leave your spot as you would like to find it yourself, or leave it in a better state than you found it. Put yourself in the place of the maintenance engineer, and try to design out any obstacles to easy maintenance. Andrew taylor bsc ma frsa art and engineering in product design general rules design for maintainability. Design patterns describe solutions for common design. Piping arrangement and general equipment layout permits access for major repair e. System decisions for maintainability, which discusses system design decisions and interactions.
Across all domains interview with il director, jim gardener a pilots perspective experiencing the bell 429 keeping the solution compelling opinion piece with gerard foley, gm business development. Maintainability is therefore a characteristic of the final design, whereas maintenance is the result of the design. Design for maintainability human factors engineering can be applied to systems design to minimize the time and effort required to perform periodic preventive maintenance as well as unscheduled maintenance design for maintainability. Backinger, office of surveillance and biometrics everette t. It specifically focuses on the identification of equipment design features, tasks, or procedures that impact equipment downtime, repair costs, labor hours and maintainer skill level requirements. Testability extent to which the operational status of modules can be tested practitioners guide to. Reliability, maintainability, and availability rma analysis. Maintainability is the ease with which a software product can be modified. Integrated logistics designing for support integrated logistics. Oct 18, 20 maintainability is an important aspect of any system lifecycle, but some machine design engineers may not give it the direct consideration it deserves. Pdf with the motto of doing it right the first time, this book focuses on spearheading the integration of designers, constructors and. One team used a modeldriven architecture mda approach to j2ee development.
Design for maintainability dfm is the first step of an effective maintenance program, linking maintenance goals to the design process. Roadway sight distance, horizontal and vertical alignment, and other design criteria are as specified in the aashto, wsdot, apwa, and nacto design manuals. Design verification procedures shall include activities such as independent checks on design drawings and specifications andor checklists documenting completeness, coordination, constructability, operability, and maintainability. Product maintainability design method and support tool based on.
Hence, in designing a system, we cannot think in terms. It improves maintainability by reducing variations of design and installation for maintenance personnel. Pdf this paper mainly studies the effect of design patterns on the software maintainability. Designing for maintainability and system availability. Maintainability is a design consideration, whereas maintenance is the consequence of design. Maintainability is created during the design process. Find materials for this course in the pages linked along the left.
Very slight changes to the design of a component can cause profound changes in reliability, which is why it is important to specify product reliability and maintainability targets before any design work is undertaken. The format of these acknowledgment in building an operating modules should be standardized so that code can system. The first time i changed the oil filter of my car first car in high school i smashed my knuckles against a grimy block of metal. The maintainability design criteria and measure index used in. The software maintainability plan must be delivered in written form and accompanied by an oral presentation. Reliability, maintainability, and availability rma. Chapter 3 maintainability introduction maintainability and reliability are the two major system characteristics that combine to form the commonly used effectiveness indexavailability. The structure size and type analysis is performed as part of the stage 1 design phase. Simcik dallosta is the performance learning director for reliability, availability, maintainability, and supportability at the dau center for logistics and sustainment.
Reliability, availability, and maintainability analysis pdf. The concept of maintainability was initially introduced with the main intention to reduce the spiralling maintenance cost and create maintenance friendly environment. It is critical for the structure design to coordinate with the roadway design during the structure size and type process. Handbook of reliability, availability, maintainability and. Worksheet for final design maintainability prediction 216 uiktdleei a 232 worksheet b. Sample size nomograph maintainability prediction form maintenance analysis continuation %eet maintenance diagram angrt3 an fps20, transmitting system. Model driven development for j2ee utilizing a model driven. Design for maintainability is therefore designing the plant to find the optimum balance between capital cost and ongoing maintenance cost, as illustrated in figure 1. It also discusses the use of the separate maintenance model as a model for the number of maintenance actions over a given time period. May 07, 2008 volume i, section 12 12 design for maintainability a for a description of the notations, see acceleration regimes. Railcorp engineering procedure design reliability, availability and maintainability ram epd 0009 introduction this procedure applies to the management of reliability, availability and maintainability ram of the railway system.
Design for maintenance guidelines designing a product is not an instant event. Reliability is further divided into mission reliability and logistics. Maintainability as a jcids design objective maintainability design attributes accessibility physical placement of hardware to facilitate maintenance. This chapter discusses the design for maintainability techniques, including quantitative maintainability modeling, level of repair analysis lora, preventive maintenance, reliability. This paper describes six principles for designing data and programs, which ease maintenance. Poor system ram has a profound impact on mission performance and. Safety management in design is addressed in procedure epd 0008. Design for maintainability reliability, maintainability. Within the latter, the focus lies on design for maintainability and supportability. So each tested event shows the impact on system availability. This is primarily the result of a shortterm view of capital project costs that fails to consider lifecycle costs and downstream activities. Developing maintainable software is like picnicking.
Dhillon 1999 maintains that although there is an increasing interest in maintainability there are still only a. Maintainability design checklist the following is a maintainability design checklist for coal mining equipment. Dhillon 1999 maintains that although there is an increasing interest in maintainability there are still only a few texts on the subject. Implementing dfm decreases the risk of reliability and uptime being impacted. Copy of software maintainability plan sites at lafayette. Its tasks range from simply managing maintainability personnel to effective execution of technical maintainability tasks. Reliability, maintainability, and availability rma analysis for the ecs project white paper february 2002 prepared under contract nas560000 responsible author william wyman s 21102 william wyman, ils manager date eosdis core system project responsible office valecia maclin s 21102 valecia maclin, director systems engineering date. The historical failure and repair data must be taken into account to create equipment pdfs. Modularity grouping of similar functions within a physical area. What is the design of the system api and how will this design support ongoing reliable operation, maintenance and expansion.
Facility maintainability is the practice of integrating operations and maintenance experience into the project planning, design and construction process to achieve ease, accuracy, safety and economy of maintenance task through the life of the facility. Effective design for maintainability is achieved though the integration of maintainability practices with the corporatelevel best practice of the continuous improvement process. It specifically focuses on the identification of equipment design. The other team used a traditional, codecentric development approach. Designing for reliability, maintainability, and sustainability core. May 12 2020 anintroductiontoreliabilityandmaintainabilityengineeringbycharleseebeling 16 pdf drive search and download pdf files for free. Maintainability is the degree to which a product allows safe, quick and easy. Pdf impact of design patterns on software maintainability. Some practical principles for design of maintainable systems the. Chapter 4 173 reliability, availability, and maintainability analysis probability density function 1 0. Lecture notes design of medical devices and implants. The innovation process in long term engineering projects this paper is based upon research relating to two longterm engineering projects from the capital goods. Every attribute table file saves all feature informations of component ci.
This deliverable documents how software maintainability will be achieved. Yahya 3 1 faculty of civil engineering, universiti teknologi malaysia, malaysia. Developing maintainable software software sustainability. Reliability, availability, and maintainability analysis. It specifically focuses on the identification of equipment design features, tasks, or procedures that impact. The design group must consider what the future may hold and make reasonable accommodations. At the operational site or wherever the prime equipment is located. Since the us military changes its policy so often, storing these files on the. Intersection setback and sight distance requirements are as specified in design manual drawings rl1001, rl1101, and rl1201. Standardize and label using recognized national, industry and company if your customer has them standards and codes is good practice. Often, they are even used for businesscritical applications.
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