一种基于FFT功率谱的全隐框玻璃幕墙结构胶脱粘长度检测方法
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摘要
针对全隐框玻璃幕墙结构胶脱粘长度检测问题,率先提出了基于瞬态脉冲动力响应信号的FFT功率谱脱粘长度检测方法。通过对4个测点进行动力响应实验信号的采集,采用FFT功率谱对实验信号进行了分析评判,并提取功率谱主峰频率对信号总功率的贡献比重ηi作为结构胶损伤长度a的因变量。采用Gaussian函数和Lorentzian函数对实验数据进行了拟合,建立了ηi关于a的函数关系式,并对小损伤的a值进行了检测识别。研究成果表明,该方法有助于全隐框玻璃幕墙结构胶脱粘长度检测技术的推广和应用。
The detection method based on FFT power spectrum of pulse transient dynamic response of structural silicone sealant damage in hidden frame supported glass curtain wall was first proposed in this paper.The dynamic response of experimental signal of four testing points was gathered and FFT power spectrum was used to analyze experimental signal.Power spectral main peak frequency of the signal in contributing proportion of the total power(ηi) was taken as a dependent variable of the structural silicone sealant damage length(a).Experimental data were fitted to establish a functional relations between 'a' and 'ηi' by Gaussian function or Lorentzian function,and the small damage value of 'a'was used to detected.Research results show that it will be help for the development,popularization and application of the structural silicone sealant damage detection technology in the hidden frame supported glass curtain wall.
The detection method based on FFT power spectrum of pulse transient dynamic response of structural silicone sealant damage in hidden frame supported glass curtain wall was first proposed in this paper.The dynamic response of experimental signal of four testing points was gathered and FFT power spectrum was used to analyze experimental signal.Power spectral main peak frequency of the signal in contributing proportion of the total power(ηi) was taken as a dependent variable of the structural silicone sealant damage length(a).Experimental data were fitted to establish a functional relations between 'a' and 'ηi' by Gaussian function or Lorentzian function,and the small damage value of 'a'was used to detected.Research results show that it will be help for the development,popularization and application of the structural silicone sealant damage detection technology in the hidden frame supported glass curtain wall.
引文
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[15]王晓宇,忘立东,吴庆宏.直接序列扩频超宽带信号分析[J].鞍山科技大学学报,2006,29(1):34-38.
[2]周永元,梁德万.隐框幕墙交接技术与质量控制[J].广西土木建筑,2002,17(2):21-26.
[3]Shi Z,Law S,Zhang L M.Damage localization by directly usingincomplete mode shapes[J].ASCE Journal of Engineering Me-chanics,2000,126(5):656-660.
[4]李国强,李杰.工程结构动力检测理论与应用[M].北京:科学出版社,2002.
[5]练象平,王新岐,梅荣利.破损状态下斜拉桥模态参数的识别[J].桥梁结构,2003,(2):61-64.
[6]Behr,Richard A,Kremer,Paul A.Dynamic racking crescendo testson architectural glass fitted with anchored pet film[J].Journal ofArchitectural Engineering,2004,(2):53-75.
[7]Krauthammer T,Altenberg A.Negative phase blast elects on glasspanels[J].International Journal of Impact,2005,24(2):1-17.
[8]Fabio Botta,Giovanni Cerri.Shock response spectrum in plates un-der impulse loads[J].Journal of Sound and Vibration,2007,4(35):20-36.
[9]王军宁,吴成柯,党英.数字信号处理器技术原理与开发应用[M].北京:高等教育出版社,2003:335-338.
[10]Jun Wei,Lokeswarappa R.Dharani.Response of laminated archi-tectural glazing subjected to blast loading[J].Journal of ImpactEngineering,2006,54(2):102-115.
[11]王甲峰.FFT功率谱估计随机信号预处理数据压缩方法[J].电子技术参考,2000,4(6):50-54.
[12]李蓓蓓.振动分析的有效工具———功率谱密度[J].包装工程,2004,25(3):45-50.
[13]田运生.爆破地震地面运动的演变功率谱密度函数分析[J].爆炸与冲击,2007,27(1):7-11.
[14]周剑平.精通Origin 7.0[M].北京:北京航空航天大学出版社,2004:287-290.
[15]王晓宇,忘立东,吴庆宏.直接序列扩频超宽带信号分析[J].鞍山科技大学学报,2006,29(1):34-38.
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