管道泄漏检测全频域法试验验证及抗噪性研究  

Experimental validation of pure frequency method for detecting pipeline leaks and its anti-noise property

作　　者：郭新蕾[1] 杨开林[1] 郭永鑫[1] 王涛[1] 

机构地区：[1]中国水利水电科学研究院水力学研究所,北京100038

出　　处：《水利学报》2011年第6期713-720,共8页Journal of Hydraulic Engineering

基　　金：国家自然科学基金(50679085);中国水利水电科学研究院专项基金(水集0912)

摘　　要：本文通过实体模型试验,将作者提出的全频域方法检测管道泄漏技术应用到泄漏参数的辨识中,以验证方法的可靠性。结果表明,该方法检测泄漏流量误差小,定位精度高。对全频域法辨识的结果进行了讨论,指出阀门关闭时间相对较长可能无法获得足够的激励压头峰值,建议该法在应用中利用阀门快速关闭产生瞬变信号。分析了阀门边界处理方式对频域数学模型的影响,指出阀门激励产生的流量变化一般不能简单的视为脉冲函数,应考虑其变化曲线形状对水力瞬变的影响。最后研究了全频域模型的抗噪性,结果表明泄漏检测全频域法具有较高的抗噪声干扰能力。A physical model test of pure frequency method for detecting pipeline leaks suggested by the authors was carried out to verify its effectiveness. It is found that if the pipe is not long enough or the closure time of valve is not short enough, the sufficient data of transient peaks could not be obtained for the analysis. Thus, short-duration transient generated by the valve is suggested in the application of the method. The influence of different treatment ways of valve boundary on pure frequency model was also investigated. The results show that the excited discharge by sharp closure of valve can not be simply regarded as impulse function, and the changing process of discharge should be considered. The study on anti-noise property confirms that this method is robust to the system noise.

关 键 词：泄漏检测 管道系统 全频域法 试验验证 抗噪性 

分 类 号：TV131.4[水利工程—水力学及河流动力学]