识别不均匀测点的风荷载的本征模态分解法

Identification Random Wind Pressure at Non-uniformly Distributed Pressure Taps with Proper Orthogonal Decomposition Method

应用POD法识别作用在结构表面的脉动风荷载的时频域特性。考虑到结构的表面比较复杂时,测点往往为不均匀布置,应用加权的本征模态分解法来识别作用在结构表面的风荷载。从而可利用识别的风荷载的时频域特性对结构进行时频域的动力分析。最后,通过对某结构的风洞试验数据进行分析来说明用加权POD法建立不均匀测点的降阶的脉动风荷载功率谱的可行性。

The proper orthogonal decomposition （POD） technique was applied to identification random wind pressure time or frequency domain specific property. The wind pressure taps was always non-uniformly distributed on the complex structure. Thus, a POD procedure appropriate for a case of pressure specified at non-uniformly distributed taps by considered the weight of taps area. The dynamic response structure was analyzed in time or frequency domain by using the wind pressure data. At last, the results of random wind pressure low-dimensional power spectrum showed that the weighted POD approach was effective; the wind pressures at many locations on the structure were measured simultaneously in a wind tunnel.