Analys av lageregenskaper utifrån mätningar i testrigg
Vertical hydropower units has a rotating mass of up to 1000 tons. For the generator and turbine to work well the rotating system is required to be centered in relation to the surrounding structure. This is achieved by means of radial bearings. The dynamic characteristics of these bearings have a strong impact on the overall rotational dynamics of the total system and thus influence the vibrations in the unit. At Vattenfall Research & Development in Älvkarleby ongoing research is taking place on how the bearing parameters should be represented in the rotor dynamic calculations. Another subject is also to investigate whether it is possible to use commercial software, developed for horizontal machines, to determine the bearing parameters in vertical hydropower units.In this context, Vattenfall has set up a thesis work in order to assist in the analysis of bearing properties based on measurements with a test rig. The test rig consists of an engine, two radial bearings and a rotor. In order to determine the bearing dynamic characteristics, the test rig is equipped with a measuring system. The system consists of displacement sensors for measuring shaft displacements of the shaft segments and strain gauges to determine the radial bearing load.The thesis is divided into two main parts: the first part consists of designing a user interface for the test rig. The second part is to assist in the process of evaluate the collected data.The development of the user interface has gone well and the goals have beenachieved. The user interface and its associated measuring system works reliably and is user-friendly for the operator to work with. The program is also adapted to be used in future similar projects. The evaluation of collected data shows that the system function satisfactorily since the results are consistent with what was anticipated in advance.