Reliability modeling of intelligent heat supply systems: A new class of cosine trigonometric based on non-homogeneous poisson process
Abstract
Heat supply system (HSS) is a very important and serious element of the urban infrastructure that has a direct impact on the comfort of the residence, energy consumption and the overall wellbeing of the people. The traditional reliability of HSS is mainly focused on hardware failure, whereas the reliability of software and intelligent control components are not fully studied and the reliability of the systems on an exact system level cannot be fully considered in the contemporary intelligent heat supply systems (IHSS). In order to surmount this constraint, this paper suggests a conditional, fused, and time-varying reliability model, which combines hardware, software, and consumer behavior. The IHSS is further broken down into hardware and software subsystems in which the hardware reliability is modeled by a cosine trigonometric Gompertz-based model, based on a recently introduced cosine pie-power odd-G family of distributions, whereas the software reliability is modeled by use of non-homogeneous Poisson process (NHPP). The proposed distribution has extremely flexible hazard rate forms, which is why it is convenient when it comes to modelling complex degradation processes in heat supply components. A consumer level topology of the reliability model with heating network topology and minimal path matrices are used to represent realistic operating conditions. Maximum likelihood estimation is used to estimate model parameters making them statistically efficient. Monte Carlo simulations confirm the performance of the suggested framework because they indicate that the bias and the mean square error decrease with the sample size. The analysis of two real-life data sets indicate that the proposed model is also always better than seven competing models in terms of various goodness-of-fit and model selection criteria. These findings affirm the strength and viable usefulness of the given method of IHSS reliability evaluation.
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