System Tests and Operation Control Strategies of an SOFC-CHP-Device for Field Testing
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Abstract not Available.As one of the most fuel-efficient diesel locomotives in the world,HXN3diesel locomotive can track more wagons with less fuel and lower emission.But the substantial noise and of HXN3locomotive cab will provide less crew comfort,more equipment and manufacturing cost.The paper will analysis the vibration of the cab,and optimize the vibration isolation system.
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Abstract Availability is the probability that a system will operate satisfactorily at any point in time, where time includes not only operating life but also active repair time and administrative and logistic time. This chapter deals primarily with reliability. The reader should consult the following: MIL‐HDBK‐472, Maintainability Prediction for methods to predict MTTR MIL‐STD‐471A, Maintainability Verification/Demonstration/Evaluation . The information in this chapter consists of abstracts from the Appendices to MIL‐HDBK‐217C, Reliability Prediction of Electronic Equipment [Ref. 3 ]. Reliability, as discussed in this chapter, deals only with reliability of equipment and entire systems. It does not deal with propagation reliability (preferred term is “time availability“) where there might be downtime due to fading or other propagation impairment. Here the theme is equipment failure or degradation. Obviously, such a failure or degradation will affect the system to which the equipment is a functional part.
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Abstract The objective of this paper is, first, to introduce and study the concept of α–field as a generalization of field, σ–field and δ–field, and we discuss the properties of this concept. Furthermore, we study the relationships between σ–field and σ–field. As a first σ–field is α–field. second, to introduce the concept of β–field as a generalization of σ–field, β–σ–field and ring. So, we prove that every σ–field is β–field and we obtain some important results deals with this concept. Finally, we introduce and study the concept of restriction of β– field and we prove that, if ℘ is a β– field of a set ℵ and K is a non-empty subsets of ℵ. Then ℘|K is a β–field of a set K.
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Engineered safety systems are standby systems. They are tested periodically to confirm that they are operational and then returned to the standby status. Although some failures or components in standby systems are self-annunciating, there are other unsafe failures that are not revealed until the next periodic test. The longer the interval between tests, the higher the probability that a failure has occurred since the last test. On the other hand, testing the system too frequently may take it out of service too often or even wear it out prematurely--both of which lead to increased unavailability. To be meaningful, any reliability goal must be enforced throughout the lifetime of the nuclear power plant. As a result, these goals are of concern to the design engineer at the conceptual stage, as well as to the plant operator, who must demonstrate continued performance capability of systems. The purpose of this research is the general subject of testing engineered safety systems and concentrates specifically on the following areas: (1) The time interval between tests as a design consideration; (2) Optimizing the availability of proper selection of the time interval between tests; and (3) Adjusting the time interval between tests on the basis of fieldmore » data on failure rates to assure conformance to an availability goal over the nuclear power plant lifetime.« less
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Protection system is the first defense line to ensure the safe operation of power grid,so it is of great significance to study its reliability.Currently,the reliability research of protection system mainly focuses on misoperation and fail-to-operation,yet it does not effectively take advantage of defect information which would occur in great probability.This paper analyzes defect information of protection devices and estimates the parameters of two-parameter Weibull distribution as well as the reliability function,failure rate function and so on.The study case shows that it can supply reference for further reliability assessment of protection systems by calculating the parameters of Weibull distribution and analyzing indices such as reliability,failure rate,and mean time between failures.
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This paper presents a method for incorporating aging failures in power system reliability evaluation. It includes development of a calculation approach with two possible probability distribution models for unavailability of aging failures and implementation in reliability evaluation. The defined unavailability of aging failures has a consistent form as that for repairable failure. This allows aging failures to be easily included in existing reliability evaluation techniques and tools. Differences between the two models using normal and Weibull distributions have been discussed. The BC Hydro north metro system was used as an example to demonstrate an application of the proposed method and models. The results indicate that aging failures have significant impacts on system reliability, particularly for an "aged" system. Ignoring aging failures in reliability evaluation of an aged power system will result in an overly underestimation of system risk and most likely a misleading conclusion in system planning.
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The paper presents a method to incorporate aging failures in power system reliability evaluation. It includes development of a calculation approach with two possible probability distribution models for unavailability of aging failures and implementation in reliability evaluation. The defined unavailability of aging failures has a consistent form which is the same as that for repairable failures. This allows aging failures to be easily included in existing reliability evaluation techniques and tools. Differences between the two models using normal and Weibull distributions have been discussed. The BC Hydro North Metro system was used as an example to demonstrate an application of the proposed method and models. The results indicate that aging failures have significant impacts on system reliability, particularly for an "aged" system. Ignoring aging failures in reliability evaluation of an aged power system will result in an overly underestimation of system risk and most likely a misleading conclusion in system planning.
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In this paper, we introduce some new collections of sets such as α– σ–field and β– σ–field as two generalizations of the notion of σ–field and we discuss the properties of these collections. Furthermore, we study the relationships between α– σ–field and σ–field. As a first result, we prove that every σ–field is α– σ–field and β– σ–field. Finally, we establish new collection of sets such as δ–field and obtain some results deals with this concept and we conclude that each of α– σ–field and β– σ–field are generalizations of δ–field.
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Summary form only given. The paper presents a method to incorporate aging failures in power system reliability evaluation. It includes development of a calculation approach with two possible probability distribution models for unavailability of aging failures and implementation in reliability evaluation. The defined unavailability of aging failures has a consistent form as that for repairable failures. This allows aging failures to be easily included in existing reliability evaluation techniques and tools. Differences between the two models using normal and Weibull distributions have been discussed. The BC Hydro north metro system was used as an example to demonstrate an application of the proposed method and models. The results indicate that aging failures have significant impacts on system reliability, particularly for an "aged" system. Ignoring aging failures in reliability evaluation of an aged power system results in an overly underestimation of system risk and most likely a misleading conclusion in system planning.
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