-Thermal management is a crucial step in the design of power electronic applications, especially railroad traction and automotive systems. Mass/size parameters, robustness and reliability of the power electronic system greatly depend on the cooling system type and performance. This paper presents an approximate parameter estimation of the thermal management system required as well as different commercially available cooling solutions. Advantages and drawbacks of different designs ranging from simple passive heatsinks to complex evaporative systems are discussed.
Abstract. This paper presents a new integrated (multiport) DC/DC converter for hydrogen buffer interfacing in renewable energy systems. In comparison with traditional solutions based on individual converters for interfacing of electrolyser and fuel cell the proposed topology features the reduced energy conversion stages. The paper analyzes and discusses the operating principle of a new converter. Several guidelines are presented for the new converter design. Finally, theoretical background was verified by the simulations.
Проведены обзор и анализ способов коррекции температурных деформаций, возни-кающих в процессе эксплуатации металлорежущих станков и приводящих к измене-нию относительного положения инструмента и заготовки, что снижает точность об-работки и надежность оборудования. Описаны некоторые широко применяемые в станкостроении способы коррекции температурных деформаций и принципы их ис-пользования, выполнен их сравнительный анализ. Показано, что все существующие способы коррекции температурных деформаций имеют свои достоинства и недостат-ки, различные достоверность результатов и ограничения по принципам использова-ния, а выбор способа зависит от стоимости, надежности, требований по точности об-работки и ряда других факторов. Как следствие, каждый из описанных способов кор-рекции температурных деформаций имеет свою область применения, в которой он может быть использован с максимальной эффективностью.Ключевые слова: металлорежущий станок, рабочий орган, способ коррекции, темпе-ратурные деформации, исполнительный механизм, погрешность обработки, сравни-тельный анализ.This article provides an overview and analysis of the methods for correcting thermal deformations arising in the process of machine tool operation. These deformations lead to a change in the relative position of the tool and workpiece and reduce the machining accuracy and the reliability of the machine tool. The authors describe some of the methods for correcting thermal deformations that are widely used in machine building, explain their application principles and perform their comparative analysis. It is shown that all the existing methods of correcting thermal deformations have advantages and disadvantages, different reliability of the results and limitations with regards to the application principles. The choice of the method depends on the cost, reliability, machining accuracy requirements and other factors. As a result, each of the described methods for correcting thermal deformations has its own area of application where it can be used with maximum efficiency.
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