|
Currently, thermal power plant units increasingly larger capacity and size , the required amount of cooling water circulating pump and the scale increases, it is easy to cause multiple units run lead circulating pump room resonances. This generally occurs in certain work area units excessive vibration phenomenon, not only affects the stability of the unit itself , and will lead to pumping station building strong vibration , loud noise , affect workers' mood , which pump is very important question , we must pay close attention. The topics to one million units circulating water pump house as a background study the dynamic characteristics of the pump , and explore the thermal power plants due to the centrifugal force generated by rotation of the pump unit as well as the dynamic response of structural vibration pump , pump design , considering the vibration unit influence and control of reference. The main contents and conclusions are as follows: 1 , describes the power plant circulating water pump and pump structural vibration problems Development and Research , outlines the basic theory of dynamic analysis and artificial boundary theory . 2 , in order to provide a practical engineering design institute , for example, with a large finite element software ANSYS simulation pumping the upper and lower structures calculated through modal analysis, the structure of the pump vibration characteristics , analyzed and discussed the two kinds of boundary conditions structural dynamic behavior under different pump . 3, with the harmonic response analysis of rigid foundations and elastic foundation case, pumping a unit , two units , three units running ( ie any combination of harmonic loading under ) varies with frequency shift , speed of reaction out of the resonance region . Comparative analysis of harmonic loads the pump dynamic response values. 4, using transient dynamic analysis simulation unit boot process , with different combinations of operating conditions , power plant pumping comparative analysis results in harmonic loads reach the rated speed before the most unfavorable frequency band , and summarizes the different units number , initial phase value , angular velocity , coefficient of subgrade reaction in case of dynamic response values.
|