基于谱估计的微振动测试与评估方法及其应用  

Ground-vibration testing and evaluation method based on spectral estimation and its application

作　　者：王红娟 唐琳[2,3] 邹进贵[1] WANG Hongjuan;TANG Lin;ZOU Jingui(School of Geodesy and Geomatics,Wuhan University,Wuhan 430072,China;Advanced Light Source Research Center,Wuhan University,Wuhan 430072,China;The Institute for Advanced Studies,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学测绘学院,武汉430072 [2]武汉大学先进光源研究中心,武汉430072 [3]武汉大学高等研究院,武汉430072

出　　处：《核技术》2024年第11期16-22,共7页Nuclear Techniques

基　　金：湖北省科技重大专项任务(No.2021AFB001)资助。

摘　　要：随着第四代同步辐射光源对束流亮度和发射度的要求日益严苛,微振动对束流品质的影响逐渐凸显。然而,国际上尚无统一的标准来全面测试和评估地基微振动的影响,对微振动的有效管理和控制变得尤为困难。本文建立基于谱估计的振动数据处理模型,并提出基于概率统计的方法来评估地基微振动位移,全面客观地评价振动位移有效值。利用该模型对武汉先进光源预研基地的实验大厅进行振动对比测试、振源分析及振动位移评估,得出垂直方向的振动位移有效值的平均值(Average Root Mean Square,Ave RMS)为8.08 nm,标准偏差σ为4.55 nm,即垂直振动位移(Ave RMS+3σ)为21.73 nm,满足40 nm的设计要求。该振动数据处理方法不仅适用于初始地块与基础隔振处理后地基的振动评估,还适用于元部件级别的振源排查分析。[Background]With the increasingly strict requirements of the fourth-generation synchrotron radiation light source on the brightness and emittance of the beam,the impact of micro-vibration on the beam quality has gradually become prominent.However,there is still no unified standard for comprehensive testing and evaluating the impact of ground-based micro-vibrations,making the effective management and control of micro-vibration particularly difficult.[Purpose]This study aims to evaluate the random characteristics of ground vibration and analyze the vibration sources in detail.[Methods]A spectral estimation-based model was developed for vibration data processing,and a method based on probability statistics was proposed to evaluate the displacement of ground micro-vibration.Then,triaxial force feedback velocity sensor(seismometer)was employed to test the micro vibration of foundation of Wuhan Advanced Light Source(WALS)pre-research site,and the vibration root mean square(RMS)displacement was comprehensively and objectively assessed by aforementioned approach.[Results]The results indicate that the vertical vibration average RMS displacement of the isolated foundation in the experimental hall of WALS within the pre-research zone of WALS is 8.08 nm,with aσvalue of 4.55 nm.It is noted that the vertical vibration displacement(ave RMS+3σ)reaches about 21.73 nm,which satisfies the 40 nm requirement.[Conclusions]This vibration data processing method proposed in this study is appropriate for evaluating the vibrations of the original background and isolated treatment foundation,as well as for analysis of vibration sources at the component level.

关 键 词：地基微振动 随机振动 位移功率谱密度 振动位移有效值 同步辐射光源 

分 类 号：TL505[核科学技术—核技术及应用] TU472[建筑科学—结构工程]