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Abstract
Low speed power units with a capacity of 1000megawatts and a rotor speed of 1500 rpm are used at nuclear power plants. These turbogenerators belong to the group of batch machines in which the form of the main movement is uniform rotation. During the operation of the turbogenerators of the indicated capacity, the need emerged to solve a number of complex issues of interaction between the turbogenerators – foundation – system and the foundation on with the aim of developing measures ensuring the high reliability of the operation of such a system. These power units have a number of features that do not allow the use of common frame foundations, as a result of which new types of foundations were created specifically for powerful low speed turbogenerators. Such turbogenerators have significant geometric dimension and masses of rotating parts. All this leads to the fact that the shaft lines of such turbogenerators are very sensitive to the smallest relative displacements of the supports, cansing its misalignment and, as a result, leading to a violation of the normal operating mode of the turbogenerator, and in a number of cases to emergency shutdown. During the operation of the turbogenerator, various factors influence the alignment. The most significant is the deformation of the foundation as a result of uneven settlement of the base, as well as thermal deformation of the structure. Using the finite element method, a mathematical model has been developed for calculating the thermally stressed state of spatial structures such as the foundations of turbogenerators in various operating conditions of power equipment. Considered the spatial quasistatic problem of determining the thermally stressed state of the foundation structure. The solution of the problem was based on the principle of independence of thermal and mechanical effects. The results of computational and experimental studies are given on the example of foundations for operating turbogenerators of a nuclear power plant.
Highlights
З використанням методу скінченних елементів розроблено математичну модель розрахунку термонапруженого стану просторових конструкцій типу фундаментів турбогенераторів в різних умовах експлуатації енергетичного обладнання
Low speed power units with a capacity of 1000megawatts and a rotor speed of 1500 rpm are used at nuclear power plants
These turbogenerators belong to the group of batch machines in which the form of the main movement is uniform rotation
Summary
S e де X ,Y , Z – вектор об’ємних навантажень, Px , Py , Pz – вектор поверхневих навантажень. У відповідності до МСЕ [10] проекції вектора переміщень представимо наступним чином m m m u Niui , v Nivi , w Niwi ,. I 1 i 1 i 1 де ui , vi , wi – вузлові значення компонентів вектора переміщень, i – номери вузлів в елементі, Ni – функції форми.
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