Program listing for fault tree analysis of JPL technical report 32-1542

The computer program listing for the MAIN program and those subroutines unique to the fault tree analysis are described. Some subroutines are used for analyzing the reliability block diagram. The program is written in FORTRAN 5 and is running on a UNIVAC 1108

Reliability determination of ignition system of rocket platform using reliability block diagram and FMEA analysis

This paper presents reliability determination of ignition system using the reliability block diagram and also, Failure Mode and Effect Analysis of ignition system is performed. This system is based on PLC controller to control the sequence of operation and electrical devices have a function to connect and disconnect the electrical circuit for supplying electric power for igniting the rocket. According to the complexity system, sometimes found that out of function such as misfire and hang fire. In this investigation, reliability block diagram of the ignition system include mechanical and electrical mechanisms is determined. By considering reliability of each component based on history of using, maintenance record, test report, and expert opinion and using ignition system reliability block diagram, reliability of ignition system can is determined. Moreover, since connector is the most important parts of ignition system by the highest RPN number. Hence, these parts must have a high reliability and have to more preventive maintenance and replace the new one after found the defect

Reliability prediction - Array D Redundant Command Receiver

A reliability prediction was performed on the ALSEP Redundant Command Receiver for Bendix Aerospace Systems.Contract Number: NAS 9-5829. Subcontract Number: SC-0721summarized by T. W. Fox.Introduction -- Requirements -- Summary of Analysis and Conclusions -- Analysis Details -- Functional Description -- Reliability Block Diagram -- Logic Diagrams and Math Model -- Multiple Failure Probabilit

Reliability Block Diagram Method for RAM Study of Dehydration Unit

Reliability, Availability and Maintainability (RAM) can make a huge different in plant sector. Maintenance with support of good RAM analysis can help in reducing the system unavailability and its effect. For this project, RAM analysis will be done using Reliability Block Diagram (RBD) technique. The data involve will the time to failure and time to repair data. The analysis can help to identify critical component that can affect the whole system reliability. From that, further planning in term of maintenance and improvement can be done. With a good modeling and analysis, it is possible to make availability improvement. The research will be based on the Dehydration Unit (DHU) of a Gas Processing Plant (GPP). DHU is essential in a GPP to remove water from then natural gas. If the water is not being removed, it will affect the transmission and the processing of the gas

Reliability modelling of uninterruptible power supply using probability tree method

The unreliability of public power lines have led to the need of uninterruptible power supply (UPS). Utility power failures will cause unacceptably high risk to the profitability, existence and growth of the vital aspect of business that depends heavily on uninterrupted power supply. For this reason it is important to develop a method to estimate the reliability of such system, to ensure that it will perform satisfactorily when needed. This paper describes and discusses an approach to predict the reliability parameters of the UPS system using the probability tree method. Important UPS reliability parameters such as failure rates (lambda), mean time between failures (MTBF), and reliability (R), can be obtained from this method. These quantitative reliability parameters can play an essential role in selection and application of the UPS. The method was applied to different topologies of UPS systems and comparisons were made between the results obtained form probability tree method and the reliability block diagram (RBD) method

A Petri Net Based Reliability Block Diagram Model for Category I Medical Devices Reliability Analysis

The medical industry incorporates technology and breaks different types of equipment into three various categories determined according to the technologies and their usage. The first category, which is the focus of this article, consists of devices that are directly linked to the life of the patients, for example a ventilator. The purpose of this study is to develop a new reliability technique, based on the Reliability Block Diagram (RBD) and Petri Net, for Category 1 equipment. The RBD, focuses on showing how the failure of different parts could affect the sub-systems of the equipment and how those failures could cause an overall system failure. The second method, Petri Net, is a tool that is used to analyze various types of information processing systems. Combining these two methods will allow the user to determine the reliability of the different systems and subsystems with various pieces of equipment. The knowledge gained by this analysis will be used to determine the likelihood that the failure of specific subsystems will cause an overall system failure. The overall anticipated result is to thoroughly develop this new methodology. The complete process that is used to finish the calculation process for the subsystems will be shown, in addition to the completion of the final Reliability Block Diagram

Reliability Block Diagram Assessment of Ethylene Oxide Production Facilities

Reliability block diagram assessment of ethylene oxide production facilities. Having a maintenance plan by referring to the OEM manual is not the optimum time interval. The manual usually created to follow the failure rate of the equipment in a general operating range and condition, and tested independently. Difficulty in having optimal maintenance plan is the accuracy of the data and the equipment modeling. Accuracy in the data usually is very low therefore creating optimum strategy is the best solution. In the study component prioritization is the strategy based on risk. Focused on the developing the reliability block diagram for the ethylene oxide production facilities