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本文概述了反应堆主换热器模拟体管束在空气中的振动特性试验研究。本试验采用共振法,通过接触测量——应变片、压电晶体片,加速度计和非接触测量——电涡流传感器,测量了管子在空气中的固有频率和振型。由于栅网支承与管子之间存在间隙,栅网板具有一定宽度.因此,管子与支承的接触作用点是随机的。试验发现.管子具有丰富的频率和振型,测量的主控频率和主控振型与两端固定中间支承为“刀刃”式支座的连续梁理论计算结果很吻合,频率相差不超过7％。本试验研究为水流振动试验研究提供了依据。
This paper summarizes the experimental study on the vibration characteristics of the simulated tube bundles in air of the main reactor heat exchanger. In this experiment, the resonance method was used to measure the natural frequencies and mode shapes of the tubes in the air through contact measurement - strain gauges, piezoelectric crystal sheets, accelerometers and non-contact measurement-eddy current sensors. The grid plate has a certain width due to the gap between the grid support and the pipe, so that the point of contact of the pipe with the support is random. The experimental results show that the tube has abundant frequency and mode shapes, and the measured main control frequency and main control vibration mode are in good agreement with the theoretical calculation results of continuous beams with “knife-edge” type support at both ends of fixed support, with the difference of not more than 7% . The experimental study provides the basis for water flow vibration test research.