环境随机激励下在役石油钻机井架试验模态参数识别  

Experimental Modal Parameters Identification of Oil-drilling Derrick under Ambient Random Excitation

作　　者：刘金梅[1] 韩国有[1] 周国强[2] 

机构地区：[1]大庆石油学院机械科学与工程学院,大庆163318 [2]大庆石油学院秦皇岛分院石油井架检测国家计量认证重点实验室,秦皇岛066004

出　　处：《科学技术与工程》2009年第10期2587-2591,2596,共6页Science Technology and Engineering

基　　金：中国石油天然气集团公司科学研究与技术开发项目(03B209000)资助

摘　　要：针对钻机井架的结构形式和作业特点,详细讨论了模态测试中若干试验参数,如激励方式、传感器位置以及频率分辨率等,提出了基于环境随机激励的钻机井架结构试验模态识别的一种有效方法。根据激振形式,推导了模态参数识别公式,依据结构响应的自功率谱识别井架的模态频率,依据互谱与自谱的峰值之比近似地识别模态振型。针对海洋和陆地钻机两种井架形式进行分析。该方法处理简单、快速、实用,适用于大型复杂钢构结构,具有一定的工程应用价值。Aiming at the design feature and the operating mode of drilling derrick, a number of modal test parameters is discussed in detail such as type and placement of excitations, arrangement of aecelerometers, frequency resolution etc. And a effective method used to experimental modal parameters identification under ambient excitation is proposed. Modal frequencies are identified based on auto-spectrum of the structural response, and mode shape is identified in accordance with the ratio of the cross-spectral peak and the auto-spectral peak approximately. The method is simple, fast, practical and applicable to large complex steel structure, which have a certain value of the works.

关 键 词：石油钻机井架 模态参数识别 模态试验 环境随机激励 

分 类 号：TE22[石油与天然气工程—油气井工程]