Showing papers on "Preventive maintenance published in 1972"
TL;DR: In this paper, the Laplace-Stieltjes transform of the time distribution to the first system-down and the mean time to first systemdown were derived by applying the relationship between Markov renewal processes and signal flow graph, and numerical examples were presented for the k-Erlang failure time distributions.
Abstract: We consider a standby-redundant model of two units, where we assume that one unit is operative and the other unit is in standby at time t = 0. If the operative unit fails, a unit in standby is put into preventive maintenance policy of the operative unit to maintain our the preventive maintenance policy of the operative unit to maintain our system with high reliability. Our concern for the system is the time to the first system-down. The Laplace-Stieltjes transform of the time distribution to the first system-down and the mean time to the first system-down are derived by applying the relationship between Markov renewal processes and signal flow graph. Further, the behavior after the system-down is investigated by using the results of Markov renewal processes. Finally, numerical examples are presented for the k-Erlang failure time distributions. The optimal preventive maintenance time is discussed.
26 citations
TL;DR: In this paper, the analytic behavior of a system with preventive maintenance is studied and the supplementary variable technique has been employed to obtain the solutions when all the distributions follow different general laws.
Abstract: A system is generally required to undergo preventive maintenance in addition to the irregular repairs in order to prevent frequent failures. This paper aims to study the analytic behaviour of a system with preventive maintenance. System is assumed to undergo preventive maintenance after everyM number of failures. After each preventive maintenance the system regenerates and a new cycle starts again. It may be noted that the supplementary variable technique developed byKielson andKooharian andCox has been employed to obtain the solutions when all the distributions follow different general laws.
5 citations
01 Jan 1972
TL;DR: In this article, the inspection techniques described in this paper, and the results shown, were developed and applied for inspection of these platforms, and many of the techniques are applicable to other marine structures, such as pipelines, SBM installations, loading booms, piers etc.
Abstract: About 1968, it became apparent that the tremendous investment in offshore platforms, particularly in the Gulf of Mexico, warranted to periodic inspection and preventative maintenance program. The inspection techniques described in this paper, and the results shown, were developed and applied for inspection of these platforms. Many of the techniques are applicable to other marine structures, such as pipelines, SBM installations, loading booms, piers etc.
5 citations
TL;DR: In this paper, the Deviation Concept is used for preventive maintenance of shipboard machinery, where a portion of an on board computer for acquiring and analyzing equipment data is utilized. But the application is limited to a small portion of the onboard computer.
Abstract: The need for preventive maintenance of shipboard machinery has been well established. The necessity of insuring increased reliability of machinery and therefore availability of vessels can clearly be justified on economic grounds alone. Various methods to date rely on statistical means of predicting failure rates. This requires a large number of inspections of failures to develop confidence in the system. An alternative method to statistical analysis is one which is continuous in nature. This method of analysis is called the Deviation Concept. The application utilizes a portion of an on board computer for acquiring and analyzing equipment data. This data which is currently available aboard ship via instrumentation can be utilized effectively by the Deviation Concept.
1 citations