时频分析技术在桥梁预应力管道注浆质量检测中的应用

摘要

管道注浆质量直接影响到预应力混凝土桥梁的承载能力和耐久性,亟待发展注浆质量无损检测技术.时频分析技术是波纹管声波检测资料分析的重要手段,它通过分析时间-频率域内振动能量的分布规律,实现对梁板与波纹管振动模式的分析,识别出纵波、横波和各模态的Lame波及其相应的传播速度,与偏移成像技术相结合,有效地确定注浆质量缺陷的位置.%Grouting defects affect the bearing capacity and durability of pre-stressed concrete bridge. So the technology of NDT of ducts grouting is required. Duct acoustic time-frequency analysis technology is such an important method that it can analyze the vibration mode of the beam and duct by the distribution of vibration energy in the time-frequency field. It also can identify the P-wave,S-wave,Lame wave in different mode include the velocity. Combined with migration imaging technology.it can effectively locate the grouting defect in the duct.