论文标题
确定最少所需加速度计的数量仅用于输出框架的结构识别
Determining minimum number of required accelerometer for output-only structural identification of frames
论文作者
论文摘要
操作模态分析（OMA）旨在根据环境源激发的结构的响应数据来识别结构的模态性能。环境振动结构的模态参数由固有频率，模式形状和模态阻尼比组成。在本文中，已经在有限元软件，ANSYS和响应（节点的加速度）中对具有任意加载的典型帧进行了建模。通过使用这些数据以及用MATLAB编写的代码，梁的模态参数（固有频率，模式形状）用FDD（频域分解）和PP（峰拾取）方法鉴定，然后用输入输出方法的结果证明是通过模态分析确定的。结果表明，在确定帧的动态特征的三种方法之间存在良好的一致性。然后，已经确定所需加速度计的最小数量，即记录该位置的加速度会导致识别框架的所有固有频率。
Operational modal analysis (OMA) aims at identifying the modal properties of a structure based on response data of the structure excited by ambient sources. Modal parameters of the ambient vibration structures consist of natural frequencies, mode shapes, and modal damping ratios. In this paper, a typical frame with arbitrary loading has been modeled in finite element software, ANSYS, and the responses (accelerations of nodes) have been achieved. By using these data and the codes written in MATLAB, the modal parameters (natural frequencies, mode shapes) of the beams are identified with FDD (Frequency Domain Decomposition) and PP (Peak Picking) methods and then justified with the results of input-output method which was determined by modal analysis. The results indicate that there is a good agreement between three methods for determining the dynamic characteristics of frames. Then, the minimum number of required accelerometer has been determined that recording the acceleration in that location leads to identifying all the natural frequencies of the frame.
