STUDY ON VIBRATION BEHAVIOR OF DIRECT AIR COOLED CONDENSER SUPPORT PLATFORM BASED ON PRIMARY-SECONDARY SYSTEM COUPLING EFFECT

Equipment has a significant influence on the dynamic behavior of the structure in the direct air cooled condenser support platform. The dynamic properties of four direct air cooled condenser support platforms are measured in site, and identification of the structural dynamic characteristic parameters under the excitation of fans is researched. A 1/8 scale model is constructed and tested. The structural dynamic properties, the resonance vibration frequency of the structure and fans, the amplitude-frequency curve under different work states of fans, and the dynamic strain of typical members are measured in the experiment. The modal analysis and steady state analysis are also performed, and the calculation results show agreement with the test results. The results can be used to comprehensively understand the interaction between a piece of equipment and a structure as well as the structural vibration properties of the direct air cooled condenser support platform.