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Оценка показателей достаточности комплекта запасных частей, инструментов и принадлежностей для источников бесперебойного питания центра обработки данных по паспортным данным
Objective. To propose an approach to assessing the parameters of a SPTA package for industrial uninterruptible power supplies according to their Data Sheet using modern techniques. Methods. The article uses methods of dependability theory, Markov process theory, optimization methods. Results. Using the proposed approach for trunk-modular uninterruptible power supplies with redundancy and restoration and limited spare parts, the stages of parametric synthesis of the SPTA package are determined. For each stage, the application of mathematical models necessary for calculating the characteristics and parameters dependability of the power modules according to the dependability measures of the UPS, as well as mathematical models linking the sufficiency measures of the SPTA package with its parameters, is justified. The use of these models makes it possible to calculate the failure rates and restoration rates of their power modules, as well as the mean operating time to failure and the mean time to restoration, according to Data Sheet on measures of reliability, maintainability and availability of UPS. In turn, the obtained dependability characteristics are the initial data for calculating the values of the sufficiency measures of a SPTA package (the mean time for satisfying applications). The use of the value of the mean time for the satisfaction of applications with a SPTA package as a criterion for the mean time to restoration of the power module allows us to conclude that it is possible in principle to ensure the dependability measures stated in the Data Sheet during its operation, and, consequently, the possibility of using this UPS. If such a possibility exists, then using the value of the mean time for satisfying requests as a limitation, as well as taking into account the restrictions on the initial stock level in the SPTA package, it is possible to synthesize a SPTA package (choose a replenishment strategy and determine its parameters (delivery time, etc.)). A comparison of the logistics capabilities and the resulting data for the chosen replenishment strategy will allow us to make a final conclusion about the possibility of maintaining the declared dependability characteristics of the UPS throughout the entire operation time. Conclusion. The approach proposed in the article makes it possible for industrial UPS built on a backbone-modular architecture with redundancy and restoration to evaluate both the fundamental possibility of ensuring the dependability stated in the Data Sheet for them, and the economic feasibility of their use. In addition, if there is a fundamental possibility of ensuring the dependability of the UPS, but the operating costs of maintaining it are unacceptable, then for them it is necessary to assess the possibility of reducing the number of repair teams (reducing the cost of their maintenance) and/or using more efficient redundancy methods (mixed redundancy, mixed redundancy with rotation, etc.). However, it should be borne in mind that the proposed approach based on the use of mathematical models does not guarantee 100% accuracy of estimating the parameters of the SPTA package, because the mathematical models used in it, like any other models, have limited accuracy and the results obtained with their help require experimental confirmation either by tests or controlled operation.