Waterway Lock Maintenance Decision-making Based On Reliability Theory

With the gradual completion of large-scale construction projects, facilities maintenance management has become a hot topic in the field of engineering management. Lock is the key infrastructure of the waterway transport corridors of bulk cargo, scientific maintenance management is very important for the normal operation of the system and the clear of the waterway channel, and it is also very important for the the nation’s economic growth. In the research of facility maintenance decision-making, the maintenance information of the facilities’life process has been paid more and more attention. However, the health rule hidden in the maintenance information of the waterway lock is still not excavated and utilized. Based on the engineering life cycle, the complex system reliability theory and the maintenance decision-making theory are used, on the foundation of the repair event datas during the waterway lock life process, the ideas and methods of manufacturing reliability analysis is learned to study the reliability characteristic and maintenance managemet optimization of waterway lock life cycle.The main research contents include:(1) The basic theory and research framework. Based on the analysis of life cycle management theory, complex system reliability theory and maintenance decision-making theory, the main issuse of life cycle management is concluded, andthe basic model is constructed to disscuss the waterway lock life cycle reliability characteristic and maintenance management decision-making through learningthe ideas and methods fromthe products’ rebiliality and maintenance decision.(2) The construction of Hall three-dimension structure model for integrating maintenance information of waterway lock. Waterway lock engineering breakdown structure (WLEBS) is built. The Hall three-dimensional structure model for integrating maintenance information of waterway lock is developed from time dimension, structure dimension and information dimension. These make the waterway lock life cycle information comparability and utility. The problems of ’maintenance information isolated island" and the bottlenecks of reliability analysis datas are solved.(3) Developed the waterway lock reliability analysis model based on event datas(RABED), andverified the usefulness of the model by 17 locks maintenance record datas. Many literatures discussed the importance of the maintenance information in facilities life cycle management, but they didn’t study how to use the information systematic.Reliability theory application in the field of civil engineering has been broken, and it is taken from the perspective of generalized reliability of complex systems in the dissertation.Waterwaylock system reliability indexs have been defined, the process for RABED has been designed, and how to estimate the reliability paramenters is discussed. The reliability for componenrs, subsystems and the whole lock system has been studied thoroughly byusing failure model, effects and criticality analysis(FMECA) and lifetime distribution model. The empirical research has been done through real datas. Though the empirical study, RABED model has been verified practicability and some signfincant conclusions have been obtained. From the empirical results, we have been found reliability rules of locks in busy rivers. As a conclusion, RABED model can give systemtic solutions for maintenance information usage, and it can also refer to other facilities life cycle maintenance management.(4) The rules of relationshipbetween maintenance decision variables for waterway lock life cycle is decuced.Multiple linear regression analysis is adapted to probe the relationship between waterway lock overhaul, maintenance and anaual operational capabilities. Quantitative analysis results indicate that anaual maintenance costs is positively correlated to overhaul cost and maintenance units, and it is negatively correlated to anaual operation ablity indexs; the time between maintenance is is negatively correlated to overhaul cost, and it is positively correlated to anaual operation ablity indexs. The regression analysis results are similar to the relationship between huamans’ health and labor ability. It has a reseaonable and realistic economic explanation.(5) Established life cycle maintenance decision framework and optimization model for waterway lock, and its sciefitic verified by a case study. Lock maintenance decision influce affects have been studied compressively, and a fully maintenance decision analysis produre is built. Life cycle maintenance decision-making indexs is set up from the expect costs and the waterway lock performance.Different maintenance modelsis Combined and random factors of repair events occurance and repair time are considered, Monte Carlo dynamic reliability simulation model for waterway lock is developed, and lock life cycle maintenance optimization is further dissussed. Maintenance optimization of sigle lock in busy rivers as anexample is given to explain how to use the proposel framework and model in waterway lock life cycle management.The conclusion of the dissertation expands the complex systems theory application fields, and furtherly improves engineering life cycle management theory. The research results contribute to administrative department making scientific and reasonable maintenance decision under the changing environments. Also, it has a very important theoretical and practical significance on achieving the life cycle management goals of waterway lock.