The work describes the process of assessing the static and dynamic strength of the rotor of an axial smoke exhauster with twin blades which allow significantly increasing its efficiency. To build a calculation model for the strength analysis, the geometric model was simplified by removing bolted connections, slicing small surfaces, as well as modeling welds in the form of roundings and chamfers. Such simplifications made it possible to build a high-quality finite-element mesh with the sufficient accuracy for performing engineering calculations. Calculation models include a finite-element model of one sector of cyclic symmetry of the impeller of the smoke exhauster, which is used to more accurately determine its stress-strain state and local maximum stresses in the places of their concentration in the root sections of the blades and in the places where they are connected by jumpers due to the action of centrifugal forces, aerodynamic loads on the blade and thermal loads due to wheel heating, as well as a finite-element model of the entire rotor with a less detailed meshing of the impeller, which in this case plays the role of a mass-inertia element, and a more detailed meshing of the shaft to analyze its static strength and reactions in bearing assemblies from the action of gravity and determine natural frequencies and mode shapes of rotor vibrations and the possibility of resonances with multiples of the frequency of excitating loads. The analysis of the static strength of the impeller and the rotor shaft of the smoke exhauster was performed by comparing the von Mises equivalent stresses with the allowable stresses, and the analysis of the dynamic strength of the smoke exhauster rotor was performed by determining the level of detuning of the natural frequencies of vibrations from multiples of the frequency of the excitating load, which in this case was assumed to be the centrifugal forces acting on the unbalance of the rotating rotor. A detailed analysis of the results of calculations made it possible to establish that the elements of the smoke exhauster rotor meet the requirements of static strength under the action of all possible types of loads, and the natural frequencies of the rotor oscillations have a sufficient level of detuning from multiples of the frequency of the excitating load. In this way, a conclusion was made about the static and dynamic strength of the rotor of the smoke exhauster, which affect its resource and durability of operation in the nominal mode.
JSC "The URIR named after A. S. Berezhnoy" in 2019 carried out scientific, scientific-technical, organizational activities in the field of development, verification of national standards for refractories, harmonized with ISO standards, provided scientific-methodological, information and consulting services for the provision of normative documentation at the request of refractory enterprises in Ukraine.The Institute organized and coordinated the activities of TC 7 "Refractories", prepared a work plan and reports on the work done by TC in 2019.In 2019, JSC "The URIR named after A. S. Berezhnoy" developed five new specifications and 10 changes to the current technical specifications for serial refractory products manufactured by refractory enterprises in Ukraine. 1 new technical specification for serial refractory products, developed by PrJSC "KDZ", was checked and approved. Two new technical specifications and 5 changes to the current technical specifications for pilot refractory products manufactured by JSC "The URIR named after A. S. Berezhnoy" were developed. Changes to technical specifications and new technical specifications developed in concordance with requirements of the modern system to standardizations of the Ukraine (SОU КZPS 74.9-02568182-003:2016, DSTU 1.5:2015, SOU MPP 01.120-090:2005), have been endorsed by manufacturers and enterprise consumers, tested for compliance with current legislation, technical regulations and regulatory documents and entered into the database "Technical conditions of Ukraine" — SE "Kharkivstandardmetrology", and approved by the technical committee TC 7 «Refractories».
This article includes information about development of technical specifications (TS) and changes to the TSs for refractories by institute in 2018. In 2018, the following standards were developed, agreed with enterprises in accordance with the requirements of the state standardization system and approved: one new technical specification and 14 change to TS for serial refractory products, produced by Ukrainian enterprises; 3 new TS for serial refractory products developed PrJSC “KDZ” were checked and agreed; 6 new technical specification and 11 change to the current specifications for the pilot batches of refractories manufactured by JSC “The URIR named after A. S. Berezhnoy”. Changes to technical specifications and new technical specifications have been developed in concordance with requirements of the modern system standardizations of the Ukraine (СОУ КЗПС 74.902568182003:2016, ДСТУ 1.5:2015, СОУ МПП 01.120090:2005), endorsed by manufacturers and enterprise consumers, tested for compliance with current legislation, technical regulations and regulatory documents and entered into the database «Technical conditions of Ukraine» — SE “Kharkivstandartmetrology”, and approved by the technical committee TC 7 “Refractories”. Institute plans to continue work on the development of TS and changes to the TSs for refractory products, study and analysis of the global level of standardization in the field of refractories.
This article includes information about development of the technical specifications (TS) and changes to the TSs for refractories by institute in 2017. In 2017 in accordance to the requirements of the state standardization system 12 change to TSs for serial refractory products, produced by Ukrainian enterprises, including verification and approval 1 change to TS for serial refractory products developed PrJSC “KDZ”, 10 TSs and 4 change to TSs for pilot batches of refractories manufactured by JSC “The URIR named after A. S. Berezhnoy” have been developed and endorsed by enterprises. Changes to technical conditions and new technical conditions developed in accordance to the requirements of modern system to standardizations of the Ukraine (SОU КZPS 74.9-02568182-003:2016, DSTU 1.5:2015, SОU MPP 01.120-090:2005), have been endorsed by manufacturers and enterprise consumers, tested for compliance with current legislation, technical regulations and regulatory documents and entered into the database “Technical conditions of Ukraine” — SE “Kharkivstandartmetrology”, and approved by the technical committee TC 7 “Refractories”. Institute plans to continue work on the development of TS and changes to the TSs for refractory products, study and analysis of the global level of standardization in the field refractories.
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