Modelling and evaluation of mean time to repair at product design stage based on contextual criteria

Time to repair of a mechanical system is a function of its maintainability and external influences in the plant. Repairability means the ease of maintenance. In this paper, repairability features of the mechanical system are identified, and are modelled in terms of repairability digraph. The nodes in the digraph represent the repairability features and the edges represent the degree of influence among these. An equivalent matrix representation of the digraph is developed to define the system repairability function (SRF). Repairability correction factor (RCF) is defined as a ratio of the actual to the ideal values of SRF. A high value of RCF indicates that the system support structure is closer to the ideal state, which implies that the mean time to repair (MTTR) is same as that estimated by the designer. The presented model is illustrated with an example. The results show that the MTTR of mechanical equipment, based on contextual criteria, can be predicted, by extrapolating the design value of MTTR. The proposed methodology is capable of evaluating the realistic MTTR based on plant influencing factors and is expected to aid the designers in selecting the best design and will also help the maintenance planners.

[1]  Roland Leduc,et al.  From a conventional to a sustainable engineering design process: different shades of sustainability , 2012 .

[2]  Frank Harary,et al.  Graph Theory , 2016 .

[3]  V. Senthil,et al.  Analysis and evaluation of product design through design aspects using digraph and matrix approach , 2009 .

[4]  Pratibha Mishra,et al.  Advanced Engineering Mathematics , 2013 .

[5]  Heinz A. Preisig.  A graph-theory-based approach to the analysis of large-scale plants , 2009, Comput. Chem. Eng..

[6]  M. F. Wani,et al.  Development of maintainability index for mechanical systems , 1999 .

[7]  Christian Mascle,et al.  Product design analysis based on life cycle features , 2011 .

[8]  H. Ryser,et al.  Matrix factorizations of determinants and permanents , 1966 .

[9]  O. P. Gandhi,et al.  Quantification of human error in maintenance using graph theory and matrix approach , 2011, Qual. Reliab. Eng. Int..

[10]  Wieslaw Tarelko.  Control model of maintainability level , 1995 .

[11]  Gabriel R. Bitran,et al.  A structured product development perspective for service operations , 1998 .

[12]  Yuo-Tern Tsai.  The preliminary investigation of system reliability and maintainability to develop availability sound designs , 2005 .

[13]  J. P. Hao,et al.  A maintainability analysis visualization system and its development under the AutoCAD environment , 2002 .

[14]  Maryam Darvish,et al.  Application of the graph theory and matrix methods to contractor ranking , 2009 .

[15]  Rakesh Sehgal,et al.  Fault location of tribo-mechanical systems - a graph theory and matrix approach , 2000, Reliab. Eng. Syst. Saf..

[16]  Tore Markeset,et al.  Maintenance cost evaluation of a system to be used in Arctic conditions: a case study , 2011 .

[17]  Joseph H. Saleh,et al.  Flexibility: a multi-disciplinary literature review and a research agenda for designing flexible engineering systems , 2009 .

[18]  Shankar Chakraborty,et al.  A digraph-based expert system for non-traditional machining processes selection , 2009 .

[19]  O. P. Gandhi,et al.  Digraph‐based reliability assessment of a tribo‐pair , 2008 .

[20]  Rajkumar Roy,et al.  A review of product–service systems design methodologies , 2012 .

[21]  Amadou Coulibaly,et al.  Maintainability and safety indicators at design stage for mechanical products , 2008, Comput. Ind..

[22]  Rajkumar Roy,et al.  Developing a service knowledge reuse framework for engineering design , 2009 .

[23]  Lu Chen,et al.  Using Vector Projection Method to evaluate maintainability of mechanical system in design review , 2003, Reliab. Eng. Syst. Saf..

[24]  S. Rahman.  Reliability Engineering and System Safety , 2011 .

[25]  Ignacio E. Grossmann,et al.  Computers and Chemical Engineering , 2014 .

[26]  Andrew Kusiak,et al.  A graph-theoretic approach to conceptual design with functional perspectives , 2000, Comput. Aided Des..

[27]  Graham Thompson,et al.  The design of functional (total care) products , 2004 .

[28]  Graham Thompson,et al.  Review of maintainability design principles and their application to conceptual design , 2004 .

[29]  Tore Markeset,et al.  An approach for prediction of petroleum production facility performance considering Arctic influence factors , 2010, Reliab. Eng. Syst. Saf..

[30]  Sun Youchao,et al.  Research on Maintainability Evaluation Model Based on Fuzzy Theory , 2007 .

[31]  Ludo Gelders,et al.  Development of maintenance function performance measurement framework and indicators , 2011 .