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Phased-mission system (PMS) can have a number of mission phases with different system configurations of components. In engineering practice, there exist PMSs that have phases with time redundancy, meaning that the system is required to work in operational state for only a given duration of time within such phase, instead of all the phase duration like traditional PMS. For such complex PMS, it is not...
Array systems, such as those found in phased array radars, present unique challenges to the reliability, maintainability and availability (RM&A) modeler. Due to their large size and gracefully degrading nature, modelers struggle to construct these models using traditional techniques. These techniques often require compromising assumptions in order to simplify the model, while also limiting the...
Fault trees (FT) are widespread models in the field of reliability, but they lack of modelling power. So, in the literature, several extensions have been proposed and introduced specific new modelling primitives. Attack trees (AT) have gained acceptance in the field of security. They follow the same notation of standard FT, but they represent the combinations of actions necessary for the success of...
Reliability is one of the most important parameters of dependability. It is addressed whenever we want reliable, available and safe systems. Indeed, reliability acts on the availability and security of systems. It must be considered throughout the overall life cycle of the product or system (design, manufacturing, operation). The objective of this communication is to build an overall approach of reliability...
Products are increasingly accompanied by services such as maintenance or leasing contracts. The share of services of these so-called product-service systems (PSS) is expected to gain. The provider of such PSS-related services needs a comprehensive knowledge of the product properties and service requirements — particularly the product reliability and availability as well as necessary service resources...
There are two sections in support quantitative parameter determination for equipment requirement argumentation, which contains index selection and determination method. The paper analyzes the selections of quantitative parameter firstly, and then makes sure the needs and common process. For the characteristics of representative parameters, the paper builds up a support object model and system model...
With the possibility of operational readiness as the measuring guideline of operational readiness, Mean Time Between Failure (MTBF), Mean Time To Repair (MTTR) and Mean Time To Mission (MTTM) are selected as the variables of operational readiness function to analysis how the materiel's reliability, maintainability and mission intensity affect its possibility of operational readiness. An example of...
Sensor networks deployed for the border area monitoring requires a high degree of reliability for the data gathering in spite of any arbitrary node or sink failures. This paper proposes RelBAS, a robust data gathering scheme specially designed for the border area network to provide a guaranteed delivery of sensory data. The proposed protocol aims to find out multiple node-disjoint paths to multiple...
We extend our earlier studies of a multicomponent system accumulating damage due to a series of fatal and nonfatal shocks. The model introduces statistical dependence among the system components by associating individual shock processes with potentially overlapping subsystems made up of groupings of components. We construct an aging and statistical dependence model where damage accumulates multiplicatively...
Reliability and availability have always been important characteristics of systems but become even more critical and complex issues on networks. Due to the high complexity of accurate calculation methods, simulation methods for network reliability and availability evaluation have been a popular area of research, and received significant attention. In this paper the network topology model, the failure...
In this paper, we presented a simulation based model to analysis the reliability of phased-mission system (PMS) with repairable components. Many researches on the repairable PMS supposed that failed components would be repairable only when the system is in a good state. It is different here that failed components can be repaired no matter what state is the system in. The mission successes if and only...
In this paper we present a methodology for economic assessment of installing distributed generation (DG) for industrial/ commercial customers. We propose an approach where the benefits of improved reliability and optimal DG operation are taken into account, respecting the overall lifetime of investment and converting the monetary amounts into their present values. The method is applied by comparing...
In order to analyze the impact of multi-functional support equipment failure, tasks of multi-functional support equipment during maintenance process were described, and maintenance plan of multi-functional support equipment was taken into consideration. Maintenance support process model considering multi-functional support equipment failure was put forward, and thereafter a simulation model was built...
There are a lot of models calculating mission effectiveness of cluster of planes. But these models reckon without the mission section and the influence of spares shortage. This paper calculates the mission effectiveness of cluster of planes, which operate continuously and improves the mission section and the different operating states of system that are important to mission effectiveness of cluster...
Reliability, availability, and maintainability (RAM) are three very important and necessary disciplines that must be applied within the system engineering process to ensure program success. The best way to generate success for a system is to overlay reliability engineering principles on the system engineering lifecycle, applying a phase-by-phase approach to drive RAM into the design. Beginning very...
The paper presents the framework and processes for the development of competency-based curriculum and certifications to enable members of the engineering community to demonstrate the behaviors, knowledge, skills, and abilities necessary to perform their assignments at the highest levels of proficiency through a mix of experience, training, and education. The paper is based on the development of LOG...
Module redundancy is often used as a method of construction a reliable system. TMR is used as the method of improving reliability by module redundancy. However, TMR does not decide correct result when two of three modules fail. Therefore, we proposed a new architecture of voting termed as Stateful TMR. It uses the result of TMR and State of the history, to select the most reliable module. By the simulation,...
This paper based on four key abilities of the Prognostics and Health Management (PHM) System including the abilities of fault detection, fault isolation, fault prognosis and prognosis of the remaining life, analyzes and constructs a framework of the PHM quantitative requirements, and defines the quantitative assessment emphasis of the PHM abilities. Targeting these quantitative requirements and proceeding...
The configuration of support resources is a main factor affecting warship mission reliability. Seeking the balance between support resources and mission reliability to sustain the demands of missions is one of the targets of material support studies. This paper proposes a discrete-event simulation model written in ExtendSim and employs an enhanced evolutionary algorithm for optimizing support resources...
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