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设备冷却水泵配套电机抗震鉴定试验中的振动分析

2021-01-07陈博何洪阳张晓光

科技创新导报 2021年22期

陈博 何洪阳 张晓光

摘要:核级设备必须通过抗震鉴定,验证其结构完整性和功能完整性,设备冷却水泵配套电机要求在地震过程中正常启停,然而各激励引起的电机振动未知。基于此,采用了一种改进EEMD方法,运用该方法提取抗震试验过程中各激励引起的振动信号,并对电机振动进行分析评价。结果表明:相比于地震载荷,电机在抗震试验中自启动引起的振动明显加剧,对电机结构提出了更高要求。

关键词:配套电机 抗震试验 改进EEMD 振动分析

中图分类号:TM623  文献标识码:A  文章编号:

Vibration Analysis of Supporting Motor of Equipment Cooling Water Pump in Seismic Evaluation Test

CHEN Bo1   HE Hongyang2   ZHANG Xiaoguang3

(1. CNNP Nuclear Power Operations Management Co., Ltd, Jiaxing, Zhejiang Province, 314300 China; 2. Nuclear Power Institute of China, Chengdu, Sichuan Province, 610213 China; 3. China National Nuclear Supply Chain Operation Co., Ltd., Shanghai, 200023 China)

Abstract: Nuclear grade equipment must pass seismic evaluation to verify its structural integrity and functional integrity. The supporting motor of cooling water pump is required to start and stop normally during earthquake, but the motor vibration caused by various excitation is unknown. Based on this, an improved EEMD method was used to extract vibration signals caused by various excitation in the process of seismic test, and the vibration of the motor was analyzed and evaluated. The results show that compared with the seismic load, the vibration caused by the motor's self-start in the seismic test is obviously aggravated, which puts forward higher requirements on the motor structure.

Key Words: Supporting motor; Seismic test; Improved EEMD; Vibration analysis

核电站泵及电机数量众多,对核电站的安全运行具有极其重要的作用,要求所有抗震I类核级设备均需进行抗震鉴定,以及在地震条件下保持结构完整和功能完好[1-2]。抗震鉴定方法有分析法、试验法、分析与试验相结合、经验反馈法。针对核电站泵及配套电机等核级设备第一次进行抗震鉴定时,宜采用试验方法[3]。采用地震模拟振动台模拟地震载荷并加载其载荷,是目前核级设备抗震研究的重要手段之一。

根据相关标准及试验大纲要求,对核电站设备冷却水泵配套电机进行抗震鉴定试验,要求前3次运行基准地震(OBE)试验中电机不工作,后2次OBE试验在抗震开始8s时电机进行启停操作。抗震鉴定试验主要验证被试样机在试验前后结构完整性和功能完整性,然而国内外学者鲜有研究冷却水泵配套电机在抗震试验过程中各激励对设备的振动影响。

基于此,本文采用一种改进的集合经验模态分解方法(IEEMD),验证此方法的有效性;同时提取电机抗震试验中各激励引起的振动信号,并分析各激励对电机振动影响,为核级设备抗震及安全运行提供技术支持。……

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