停机过程中的水电站厂房支承结构动力特性识别方法  

The Method to Identify Dynamic Characteristics of Hydro Plant's Supporting Structure Using Machine Halting Process

作　　者：练继建[1] 田会静[1] 秦亮[1] 张永吉[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《中国工程科学》2006年第4期72-75,共4页Strategic Study of CAE

基　　金：高等学校博士学科点专项科研基金资助项目(20020056029)

摘　　要：运行过程中的水电站厂房支承结构动荷载的作用复杂,确定支承结构动力特性是水电站厂房动力分析中的重要问题,然而常规的试验手段对结构有较强的破坏作用或者因难度较大不易实现。利用李家峡双排机主厂房真机试验中的测试数据,基于动力学原理分析了停机过程中结构振动及荷载的变化的特点,提出了一种应用停机过程识别厂房支承结构动力特性的方法。在该方法中,将机组测试与结构测试成果相结合,并充分利用小波分析的优点,成功地克服了停机过程分析中荷载变化历程长,结构振动非平稳等不利因素。During running process, the effect of dynamic loads is quite complex. So determining dynamic characteristics of supporting structure are of great importance when making hydro plant＇s dynamic analysis. However, conventional testing measures often cause intensive destruction or are too complicated to implement. In order to solving above problems, this paper, basing on principle of dynamics, applies the test data to analyze the structure vibration and variability of loads during machine halting process, and further puts forward a new method to identify dynamic characteristics of hydro plant＇s supporting structure using machine halting process. The test data comes from prototype observation in Lijiaxia＇s power house structure of two-row placed units. The method, combining unit test and structure test result, and fully using advantage of wavelet analysis, successfully overcomes poor factor like long variation time of loads, vibration fluctuation, etc., when analyzing halting problem.

关 键 词：水电站厂房 支承结构 动力特性 停机过程 小波分析 

分 类 号：TV312[水利工程—水工结构工程]