1·A method to analyze the resonant wavelength and damping decrement of the transmission spectrum of long period fiber grating (LPFG) with bending curvature was reported.
报道了一种分析长周期光纤光栅(LPFG)透射谱谐振波长和衰减率随弯曲曲率变化的方法。
2·The important action of eigenvector in estimating stability margin is investigated, and the limitation of both system damping and logarithmic decrement criteria is pointed out.
探讨了特征向量在评估稳定性裕度的重要作用，指出了传统的对数衰减率与系统阻尼判据在评估轴承稳定性裕度时的局限性。
3·Dynamic damping ratio of frozen soil decreases with increment of frequency or decrement of temperature.
冻土的动阻尼比随频率的增加或温度的降低而减小。