基于环境激励的桥梁振动模态识别算法研究 | 您所在的位置:网站首页 › arma模型阶数高 › 基于环境激励的桥梁振动模态识别算法研究 |
基于环境激励的桥梁振动模态识别算法研究 ∗
郑德智 ; 李子恒 ; 王豪
【摘
要】 在桥梁建造和维护过程中,需要对桥梁的振动模态进行在线、实时的分 析,急需一种不需要人工激励进行快速模态分析的算法。通过研究自然激励技术 NExT( Natural Excitation Technique) 与自回归滑动平均模型 ARMA( Auto  ̄ Regressive and Moving Average Model) ,在常规的自然环境模态分析算法的 基础上构造出一种快速求解 NExT  ̄ ARMA 模型的算法进行桥梁模态识别。相比于 传统的环境激励模态参数计算方法,该算法不但降低了传统算法的复杂度,而且采 用了反馈的方式提高了计算精度。采用 ANSYS 建立有限元模型并搭建简易实验系 统分别对该算法进行仿真验证和实验验证,验证结果表明,该算法能够有效地在自 然激励下提取出桥梁结构的各阶模态,其中对前三阶固有频率的识别相对误差降到 1 %左右。 %An online,real  ̄ time analysis of the bridge vibration mode is often required during a bridge construction and maintenance. So a modal analysis algorithm with no human excitation is in urgent need. By researching the mathematical sense of NExT( Natural Excitation Technique) algorithm and ARMA model( Auto  ̄ Regressive and Mov  ̄ ing Average Model),a quick solution for NExT  ̄ ARMA model is proposed on the basis of conventional algorithms. Compared to the traditional ambient modal analysis,this algorithm not only reduces the complexity of traditional method,but also build a feedback loop to improve the accuracy. Build a simply supported beam model both in AN  ̄ SYS and real experimental platform to verify the algorithm. It shows that each mode of the bridge |
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