分析了传统的PWM_ON调制方式对无刷直流电动机在非换相期间由于截止相的反并联二极管续流而导致转矩脉动的原因。
The torque ripple caused by diode freewheeling of the inactive phase during non-commutation state of PM brushless DC motor(BLDCM)when using the PWM_ON type of pulse width modulation was analyzed.
混流式水轮机在非设计工况点下运行时，尾水管内部的非定常流动是由死水域和螺旋涡带的动态行为引起的，尾水管上部的螺旋涡带旋转引起流动的基频脉动。
The unsteady flow in a draft tube of Francis turbine under the off-design operation is produced by the dynamic behavior of a helical vortex rope with the dead core.
本文应用自适应最小二乘格型（LSL）算法估计非恒定流压力脉动的功率谱密度。
This paper uses the adaptive least squares lattice algorithm (LSL) to calculate the spectral estimation of pressure fluctuations in unsteady flow, and describes the principle of the LSL algorithm.
研究显示，前缘分离涡破裂后，流动的非定常脉动特性非常明显，这种非定常效应对机翼气动弹性特性的影响不可忽略。
It is shown that the unsteady fluctuation characteristics of the flow become highly obvious after the vortex breakdown, which exert a significant impact on the aeroelastic characteristics of the wing.
在分析与探讨脉动轴向力作用下梁的参数共振问题时，本文取四种边界条件来分析第二阶次谐波参数共振的稳定区域，确定了零解与非零解的稳定性。
This paper investigates the subharmonic parametric resonance problems of a symmetric orthotropic laminated rectangular plate with simply supported edges by the use of the singularity theory.
在分析与探讨脉动轴向力作用下梁的参数共振问题时，本文取四种边界条件来分析第二阶次谐波参数共振的稳定区域，确定了零解与非零解的稳定性。
This paper investigates the subharmonic parametric resonance problems of a symmetric orthotropic laminated rectangular plate with simply supported edges by the use of the singularity theory.
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