CAJ | 학술논문

为了考察汽轮发电机组采用弹簧隔振基础的振动特性，基于模型模态试验方法进行试验研究，根据相似理论设计制作了田湾核电站3、4号机组（2×1000 MW）汽轮发电机弹簧隔振基础的8∶1缩尺模型，采用激振法对模型的动力特性进行模态分析，得到基础模型的固有频率、振型、阻尼比等自振特性；通过以上测试结果进行强迫响应的振动分析，得到机组运行状态下的基础振动线位移结果。试验结果证明，通过弹簧隔振器的设计，使结构自振频率的分布在工作频率25 Hz附近比较稀疏，半速机采用弹簧基础优势明显；扰力点在启动过程中的最大振动线位移为23?19μm，在工作转速范围内的最大振动线位移为11?73μm，隔振效率平均为X向68?4％、Y向83?1％、Z向84?0％，均满足《动力机器基础设计规范》要求。
위료고찰기륜발전궤조채용탄황격진기출적진동특성，기우모형모태시험방법진행시험연구，근거상사이론설계제작료전만핵전참3、4호궤조（2×1000 MW）기륜발전궤탄황격진기출적8∶1축척모형，채용격진법대모형적동력특성진행모태분석，득도기출모형적고유빈솔、진형、조니비등자진특성；통과이상측시결과진행강박향응적진동분석，득도궤조운행상태하적기출진동선위이결과。시험결과증명，통과탄황격진기적설계，사결구자진빈솔적분포재공작빈솔25 Hz부근비교희소，반속궤채용탄황기출우세명현；우력점재계동과정중적최대진동선위이위23?19μm，재공작전속범위내적최대진동선위이위11?73μm，격진효솔평균위X향68?4％、Y향83?1％、Z향84?0％，균만족《동력궤기기출설계규범》요구。
To investigate the vibration characteristics of spring vibration isolating foundation for turbine?generator set, the modal tests are performed by model modal test method. A model of 8:1 of spring vibration isolating foundation for turbine?generator set for a 2 × 1 000 MW in Tianwan nuclear power plant units 3 and 4 is built up according to similarity theory, and then the test of dynamic characteristic is carried out by exciter method, and the natural vibration frequencies, mode shapes and damping ratio are acquired. The results of basic vibrating linear displacement under operation condition are obtained based on the vibration analysis of test data. The results show that the distribution of natural frequencies of structure was sparse in the vicinity of the operating frequency of 25 Hz by designing spring vibration isolating foundation. The maximum linear displacement of test point is 23?19 μm during the start?up and 11?73 μm during the operating speed range. Isolation efficiency of foundation are X?direction to 68?4%, Y?direction to 83?1%, Z?direction to 84?0%, which meet the requirements of Chinese specification "Dynamic machine foundation design specifications".