CAJ | 학술논문

通过振动试验，量化分析了机组性能，探明异常振动为横梁共振引发。引入CFD技术展开非定常数值模拟，捕捉振动工况的泵内流动特性。数值仿真场中压力、速度和力的频谱分析表明，当阀门开度较小时，泵和管道内水压脉动的低频分量频率与横梁固有频率相近，产生共振，引发强烈振动。采用“提前停泵”的减振方案，消除了阀门关死点的机组异常振动现象。CFD数值模拟实现了瞬态工况下泵内流动态信号的连续采样，解决了测量中无法获取过渡过程非平稳信号瞬态频率的难题，可作为水泵振动分析的有效手段。
통과진동시험，양화분석료궤조성능，탐명이상진동위횡량공진인발。인입CFD기술전개비정상수치모의，포착진동공황적빙내류동특성。수치방진장중압력、속도화력적빈보분석표명，당벌문개도교소시，빙화관도내수압맥동적저빈분량빈솔여횡량고유빈솔상근，산생공진，인발강렬진동。채용“제전정빙”적감진방안，소제료벌문관사점적궤조이상진동현상。CFD수치모의실현료순태공황하빙내류동태신호적련속채양，해결료측량중무법획취과도과정비평은신호순태빈솔적난제，가작위수빙진동분석적유효수단。
Quantitative analysis of pump operation performance was acquired based on vibration test. The vibration test analysis showed that the res-onance of beam was the reason to cause the intensive vibration. Unsteady numerical simulation by CFD was introduced to capture the flow character-istics inside the pump on vibration condition. The spectrum analysis results of pressure,velocity and force of simulation flow showed the low-fre-quency water pulse pressure in pump and pipes was clear to be the reason of beam’s intensive vibration. With the“shut pump before valve closed”strategy that proposed in this paper was put into effect,the intensive vibration was avoided. CFD numerical simulation technique could be used to realize continuous sampling of dynamic signal on transient conditions in pump. Since it could acquire the time-frequency symptom of non-stationary signals that impossible for vibration test,CFD could be an effective method to analyze the pump vibration.