CAJ | 학술논문

由系统复模态的特征分析可知，同一折减风速（或折减频率）下系统的气动导数可唯一确定该折减风速（或折减频率）下系统振动模态参数，反之亦然。基于该思想可建立系统振动模态参数插值确定桥梁断面气动导数的方法。在此基础上，本文主要探讨了一种归一化提取可直接插值的模态参数的方法从而保证了模态参数插值求气动导数的可行性。数值算例验证表明，归一化提取可直接插值的模态参数的方法是适用的。
유계통복모태적특정분석가지，동일절감풍속（혹절감빈솔）하계통적기동도수가유일학정해절감풍속（혹절감빈솔）하계통진동모태삼수，반지역연。기우해사상가건립계통진동모태삼수삽치학정교량단면기동도수적방법。재차기출상，본문주요탐토료일충귀일화제취가직접삽치적모태삼수적방법종이보증료모태삼수삽치구기동도수적가행성。수치산례험증표명，귀일화제취가직접삽치적모태삼수적방법시괄용적。
It has been noted that the complex modal parameters of a system could be computed from a characteristic analysis when the flutter derivative at a reduced wind velocity ( or reduced frequency ) is known. On the contrary , the flutter derivative can be obtained from the complex modal parameters of the system at a re -duced velocity ( or reduced frequency ) .Based on this idea , a new method for identifying the flutter derivatives of bridge decks was proposed .In this paper , a method to obtain the complex modal parameters of a system from i-dentified parameters was introduced .It makes sure that the flutter derivatives obtained by complex modal param-eters interpolation technique is available .The applicability of the proposed method to extract the complex modal parameters from identified parameters was proved .