Current Issue : July - September Volume : 2014 Issue Number : 3 Articles : 5 Articles
We attempt to address the issues associated with reliability estimation for phased-mission systems (PMS) and present a novel datadriven\napproach to achieve reliability estimation for PMS using the condition monitoring information and degradation data of such\nsystem under dynamic operating scenario. In this sense, this paper differs from the existing methods only considering the static\nscenario without using the real-time information, which aims to estimate the reliability for a population but not for an individual. In\nthe presented approach, to establish a linkage between the historical data and real-time information of the individual PMS,we adopt\na stochastic filtering model to model the phase duration and obtain the updated estimation of the mission time by Bayesian law at\neach phase. At themeanwhile, the lifetime of PMS is estimated fromdegradation data, which are modeled by an adaptive Brownian\nmotion. As such, themission reliability can be real time obtained through the estimated distribution of the mission time in conjunction\nwith the estimated lifetime distribution.We demonstrate the usefulness of the developed approach via a numerical example....
There are two typical subprocesses in bank productionââ?¬â?deposit generation and loan generation. Aiming to open the black box of\ninput-output production of banks and provide comprehensive and accurate assessment on the efficiency of each stage, this paper\nproposes a two-stage network model with bad outputs and supper efficiency (US-NSBM). Empirical comparisons show that the\nUS-NSBM may be promising and practical for taking the nonperforming loans into account and being able to rank all samples.\nApplying it to measure the efficiency of Chinese commercial banks from 2008 to 2012, this paper explores the characteristics of\noverall and divisional efficiency, as well as the determinants of them. Some interesting results are discovered. The polarization of\nefficiency occurs in the bank level and deposit generation, yet does not in the loan generation. Five hypotheses work as expected\nin the bank level, but not all of them are supported in the stage level. Our results extend and complement some earlier empirical\npublications in the bank level....
PVC stripping process is a kind of complicated industrial process with characteristics of highly nonlinear and time varying. Aiming\nat the problem of establishing the accurate mathematics model due to the multivariable coupling and big time delay, the dynamic\nfuzzy neural network (D-FNN) is adopted to establish the PVC stripping process model based on the actual process operation\ndatum. Then, the PVC stripping process is decoupled by the distributed neural network decoupling module to obtain two singleinput-\nsingle-output (SISO) subsystems (slurry flow to top tower temperature and steamflow to bottomtower temperature). Finally,\nthe PID controller based on BP neural networks is used to control the decoupled PVC stripper system. Simulation results show the\neffectiveness of the proposed integrated intelligent control method....
In this study, an analytical method is developed to exactly obtain the interlaminar stresses near the free edges of laminated composite\nplates under the bending moment based on the reduced form of elasticity displacement field for a long laminate. The analytical\nand numerical studies were performed based on the Reddy�s layerwise theory for the boundary layer stresses within cross-ply,\nsymmetric, angle-ply, and general composite laminates. Finally, a variety of numerical results are presented for the interlaminar\nnormal and shear stresses along the interfaces and through thickness of laminates near the free edges. The results showed high\nstress gradient of interlaminar normal and shear stresses near the edges of laminates....
An efficient fourth-order semicompact finite difference scheme has been developed to solve steady incompressible Navier-Stokes\n(N-S) equations in stream function and vorticity formulation in a triangular cavity of arbitrary geometry. The governing equations\nare transformed into curvilinear coordinates by a simple linear transformation to handle the nonregular geometry of the problem.\nThe main feature of the new higher-order semicompact scheme is that it can calculate a triangle flow with arbitrary shape for high\nReynolds numbers. It is found that the solutions obtained with the present scheme are in good agreement with the analytical results\nor with the existing results depending on the availability....
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