Reliability Analysis Of Deep-sea Environment Simulation EHV Systems

Based on the urgent needs of ultra-high pressure simulation test of deep-seaexploration equipment, development of deep-sea high pressure environmentsimulation system have carried out at home and abroad in succession.Supported byspecial funds for research of National Oceanic Publish Service Sectors in2011, theNational Deep-sea Management Center started to develop the90MPa deep-seaenvironment simulation system which is the largest by far in capacity in our country.Carrying out reliability analysis of the deep-sea high pressure environment simulationsystem, not only be able to identify the weak links which would impact systemreliability, and provide important technical reference to system development and itssecurity measures, and to help the maintenance workers determine causes of systemfault quickly and accurately during the applications, save time and improveefficiency.The paper relies on project of “Research on key technology of Deep-sea highpressure environment simulation system” which is supported by special funds forresearch of National Oceanic Publish Service Sectors in2011. Based on content andcharacteristics of the system, we carried out the reliability analysis research ondeep-sea high pressure environment simulation system, main contents are as follows:First of all, introduced development course and research status of domestic andinternational deep-sea high pressure environment simulation system, pointed out that:multi-function, high-pressure, high-volume, intelligence and high-reliability is thedevelopment trend of deep-sea simulation system in future. Then, describeddevelopment and status quo of the reliability, and discussed the main content andsignificance of this study;Secondly, discussed the main content of the reliability theory in detail, andintroduced the concept of reliability, failure density function, failure rate and failurefunction. Summarized the reliability measurement indicators, and then, described themain content of the fault tree analysis method and its specific steps; Thirdly, though involving in project implementation and reviewing relevantliterature, defined the functional properties of the system composition, workingprinciple and main components, referred finite element analysis data of the highpressure airlock completed by project team to obtain stress characteristics of the cabin.Under the relationship between strength and stress, analyzed failure modes and failurerate of cabin parts in stress concentration zone. Using the failure density functioncharacteristic distribution of electronic device and reliability block diagram method toanalyzed reliability of the control system at the same time;Finally, formulated fault tree construction scheme of the deep-sea high pressureenvironment simulation system, established the fault tree from top to bottom inaccordance with the logical relationship of the event, simplified and repaired. Gottenminimal cut-sets and structural importance of bottom events by qualitative analysis,pointed out weak links of the system and formulated the specific system maintenancescheme. Though quantitative analysis, calculated the failure rate of the systemtop-level event and proposed a reasonable maintenance program.