基于小波变换的场道脱空识别

1)中国民航大学机场学院,天津 300300; 2)冻土工程国家重点实验室,甘肃兰州 730000; 3)深圳机场集团,广东深圳518128

道路工程; 振动响应; 场道脱空; 小波变换; 小波包; 机场跑道; 无损检测

Runway pavement void identification based on wavelet transform
Wu Zhiwei1, Liu Guoguang1, 2, and Liu Zhiyong3

Wu Zhiwei1, Liu Guoguang1, 2, and Liu Zhiyong31)Airport College, Civil Aviation University of China, Tianjin 300300, P.R.China2)State Key Laboratory of Frozen Soil Engineering, Lanzhou 730000, Gansu Province, P.R.China3)Shenzhen Airport Group, Shenzhen 518128,Guangdong Province, P.R.China

road engineering; pavement vibration; pavement void; wavelet transform; wavelet packet; airport runway; nondestructive examination

DOI: 10.3724/SP.J.1249.2017.03265

备注

为研究脱空对跑道振动响应的影响,进行砂土垫层混凝土板缩尺模型试验. 利用落锤施加冲击荷载,采集不同脱空程度下道面板的竖向加速度信号,利用小波变换进行功率谱分析、能量谱分析、短时傅里叶变换、时间-尺度分析及小波包相平面分析. 通过时频图表征信号局部特性,分析脱空引起的信号差异. 结果表明,不同脱空状况引起了跑道振动特性变化,使各频带的频谱响应不同,引起各频带能量重分布. 加速度信号经小波变换处理后,反映了脱空对信号能量的影响. 脱空和半脱空区域存在信号能量差异可用于跑道脱空状况识别.

In order to investigate the influences of voids on runway vibration response, a scale model test of concrete plate with sand cushion is conducted. By using the falling weight to simulate impact loads, vertical acceleration signals of pavement under different void conditions are obtained. Wavelet transform method is used to perform energy spectrum analysis, time scale analysis and wavelet packet analysis in the phase plane. Local characteristic of pavement can be characterized by the time-frequency map, by which the differences of acceleration signals caused by voids can be achieved. The result shows that the pavement vibration characteristic is changed due to different void conditions, which leads to the spectrum response differences and energy redistributions of frequency band. By wavelet transform of acceleration signal, the influences of pavement void on signal energy are obtained. The signal energy differences for void area and half-void area could be adopted in pavement void identification.

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