管道系统泄漏检测的全频域法  

Pure frequency domain method for pipeline leakage detection in water diversion projects

作　　者：杨开林[1] 郭新蕾[1] 

机构地区：[1]中国水利水电科学研究院水力学所,北京100038

出　　处：《水利水电科技进展》2008年第3期40-44,共5页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(50679085);国家社会公益专项基金(126301041003);中国水利水电科学研究院配套专项基金(水集05KY01)

摘　　要：针对长距离管道输水系统的特点,建立了适合各种边界条件的管道水击频域数学模型,并应用拉氏变换原理导出了实测离散函数的频域数学模型。在此基础上,提出完全在频域中检测管道泄漏的新方法,即管道泄漏检测的全频域法。全频域法与之前频域法的差别有两点:一是边界条件不受限制,二是泄漏检测完全在频域中完成,无需求解任何一点的傅里叶逆变换时域函数。最后通过数字算例检验了管道泄漏检测全频域法的可行性。In consideration of the characteristics of pipeline system in long distance water diversion projects, a water hammer frequency domain model, suitable for various boundary conditions and incorporating the Laplace transform of the discrete measured data in the frequency domain, is established. A novel method for pipeline leak detection called the pure frequency domain method is proposed. Compared with previous frequency response methods, the pure frequency domain method has two advantages： the boundary conditions are unconstrained and the leak detection is carried out only in the frequency domain, without calculation of the inverse Fourier transform function. Finally, the model is verified through application to a practical problem.

关 键 词：管道泄漏 泄漏检测 全频域法 水击 水力瞬变 

分 类 号：TU991.61[建筑科学—市政工程]