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Taking multiple parameters of the main structural plates thicknesses and loads as random design variables, the strength reliability of bogie frame is analyzed based on response surface optimization approach and JC method. The response surface optimization approach is used to search the failure points of the structure limit state. Meanwhile, the sensitivity of structure reliability is also analyzed...
Nuclear power constitutes one of the main electricity production sources in several countries, e.g. in Sweden, with about half of today's electricity production. Driving forces for cost-efficiency have pushed the development of new methods for maintenance planning and optimization forward. Reliability Centered Asset Management (RCAM) is one of these new approaches, and maintenance optimization is...
Relaying communication is a necessary means to improve the reliability of Meter Reading System (MRS) based on Power Line Carrier (PLC), but the searching for relaying path is one of the biggest challenges. According to the characteristics of PLC networks, an adaptive automatic relaying method based on the parameters of power line channel state and improved ant colony optimization algorithm is put...
We describe a kind of supply chain optimization problem as a commodity stream routing problem upon a stochastic flow network. We divide the optimization problem to two parts: Firstly, establish model to calculate the optimal commodity stream allocation policy on all minimal paths; secondly, convert these allocation policy on all minimal paths to the optimal routing policy on all arcs. A multi-objective...
The blind number theory and the basic ideas of uncertain variables expressed by blind number were introduced. The mechanical structure time-dependent characteristics variation in stochastic process was deduced. The uncertain variables in time-dependent stochastic process of mechanical structure were expressed in blind number, and its time-dependent reliability optimization design model was built with...
When design complex product like electrohydrostatic actuator (EHA), all of the experts from different disciplines need to co-design and cooperate. Design variables in different disciplines couple together and affect the object functions, constraint condition. This article use multidisciplinary design optimization (MDO) method - collaborative optimization (CO) to design and optimize EHA. When performing...
In this paper, an integrated methodology is developed for optimizing inspection and maintenance of a component where delayed repair is considered to be one of feasible options. The models of failures, risk and life cycle cost are developed using probability, stochastic process and the delay time concept. The model is intended to optimise the inspection intervals and the delay of repair simultaneously...
This paper presents a methodology to determine the energy and reserve schedules with consideration of power system uncertainties. Unlike contingency analysis, the requirements of operating reserves based on the stochastic optimal power flow are not predefined. Instead, the reserve requirement is generated to meet both the system reliability and economic efficiency under system uncertainties. The stochastic...
The quickest path (QP) problem is to find a path which sends a given amount of data from the source to the sink such that the transmission time is minimized. Two attributes are involved, namely, the capacity and the lead time. The capacity of each arc is assumed to be deterministic. However, in many real-life flow networks such as computer systems, telecommunication systems, etc., the capacity of...
The game of warranty service and retail prices between the supplier and manufacture was analyzed from the point of supply chain. The system profit with no cooperation between the retailer and the manufacture was less than that with centralized decision. A cooperation strategy was proposed. Through this strategy, the profit of the whole system is the same as that of centralized decision. Whatpsilas...
An approach which combines PERT and CPM in one model to solve project scheduling problems, is introduced. Due to the stochastic nature of activity time and cost for PERT and CPM networks, robust design for project scheduling via statistical method is introduced in the presented approach. The statistical method, such as response surface methodology (RSM), is used to develop a rationale of the time-cost...
This paper describes some software needs for reliability-centered maintenance (RCM) application to asset management. Based on the RCM structured approach, a set of information artifacts and probabilistic data are derived as necessary for the correct application of the methodology. The method and experimental software have been used by a Cigre task-force in Brazil, as a supporting tool to develop a...
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