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This paper proposes an availability-based warranty policy for complex industrial equipments. Under this policy, the manufacturer will not only provide free repairs or replacements upon failures, but also ensure that the operational availability over the warranty period meets a negotiated level. Within the warranty period, imperfect preventive maintenance (PM) activities are performed to reduce equipment's...
In this paper, we have studied theoretically and numerically the thresholds of stimulated Brillouin scattering in multimode fibers. With both the coupling among all optical modes and the effect of optical and acoustic mode field profiles on the Brillouin gain spectrums considered for the first time, we propose the corresponding transcendental equations for the Brillouin thresholds of continuous-wave...
At present, the classical control strategy of PID is widely adopted in the bearingless levitation system. However, it is hard to realize high performance of levitation control, due to the influence of disturbance, parameters perturbation etc. Aiming at the problem above, the novel bearingless levitation system based on Extended State Observer (ESO) is suggested in this paper. According to the basic...
This paper presents a model to evaluate the real-time reliability of equipment whose degradation process is obviously separated into different phases. Equipment's degradation process is usually modeled by stochastic process, since it can depict the real degradation process of equipment effectively. However, a hypothesis which states that the degradation process follows a single stochastic process...
Long-stop-short-run(LSSR) system is a kind of system that is longtime non-working and short time operating. It is important to study the reliability of LSSR system in some safety critical areas. There exist manifold failure mechanisms in the LSSR system. In this paper, a competing risk model is proposed to describe the reliability of the LSSR system. LSSR system presents two main kinds of failure...
A cloud model controller for ship steering is developed with nonlinear behavior and uncertain problems of ship motion. The fast Elitist non-dominating sorting genetic algorithm II (NSGA-II) is employed to optimize the parameters of the controller. Analysis and simulation results show the design of the cloud model controller based on multi-objective optimization of genetic algorithm is effective and...
This paper presents an approach to simulating alternative supply chain configurations and analysing their respective sensitivities to external factors. First of all, the approach used for modelling the supply chain environment, characterized by uncertain factors, is presented. The factors that influence supply chain performance include elements such as customer demand, currency exchange rate, transportation...
Double-loop networks have been widely studied as architecture for local area networks. A double-loop digraph G(N; s1, s2) has N vertices 0, 1,..., N-l and 2N edges of two types: s1-edge: i??1 + s (mod N); i=0, 1,..., N-l, and s2-edge: i?? s + s2 (modN); i=0, 1,..., N-l, for some fixed steps 1?? s1<s2<N with gcd(N; s1, s2) = 1. Let D(N; s1, s2) be the diameter of G and let us define D(N) = min{...
The dynamic model of a 3D overhead crane system is established by utilizing Lagrangepsilas equation. In the model, not only the motion of the trolley in horizontal plane, but also the variation of the rope length is considered, to provide a precise description for the dynamic performance of the system states. Furthermore, the main nonlinear disturbances existing in the environment, such as the dynamic...
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