对某轴流通风机进行了有无外风筒的(开式)PIV实验。
PIV experiment is carried out on certain axial fan with and without external duct.
如果外载均匀，则展开式系数自前几项后为零，从而可得弹性层力学场量封闭形式的表达式。
When the external loads are uniform, the expansion terminates after some leading terms, and an explicit representation for the mechanical field in a layer is obtained.
本文讨论了敞开式桁架弦杆的平面外稳定性计算方法，并给出了计算实例。
The stability calculation of chords on open lattice beyond the main truss plane is discussed in the article. A calculation example is presented.
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