2篇
您的检索式：作者名="Earl HDOWELL"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 斜激波总压损失率极小值理论解与物理意义显示文摘以法向马赫数作为激波强度表征量,对斜激波关系式进行重新推导,得到了穿过激波总压损失率极小值的理论解。控制方程表达式为激波角对物面角的线性函数。依据斜激波总压损失率极小值解析公式,首先,绘制了针对超声速流总压损失率应用的楔形角-激波角-马赫数的斜激波效率图。其次,通过生成斜激波三维总压损失率等值线图,呈现了总压损失率在楔形角-激波角-特征马赫数空间上的分布规律。此外,利用斜激波效率图,揭示了等总压损失率条件下马赫数与激波角的对称双解现象。 | 史爱明 Earl HDOWELL | 2018 | 航空学报2018，39，12： | 3 |
| 2 | Dynamic Characteristics of Double-Helical Planetary Gear Sets Under Time-Varying Mesh Stiffness显示文摘Internal and external meshes are two of primary excitation sources which induce vibration while double-helical planetary gear sets are in transmission. Based on the analysis of tooth movement principle,three cases of mesh stiffness are derived via investigating the length of action lines,and catalogued in terms of β < β0,β = β0and β > β_0. The simulation demonstrates mesh stiffness between gear pairs performs as a trapezoid waveform( TW) and changes along with the line of action simultaneously,total mesh stiffness comes from the superposition of each engaged gear. While governing equations of motion contained 16 DOFs( degree of freedom) are constructed and effectively solved through the combination of numerical approaches. Comparing with sinusoidal waveform mesh stiffness( SW),the results show that dynamical factors and perturbation under the excitation of TW( β < β_0) are greater and remarkable than that from SW,with respect to the mean dynamic factors about 1. 51 and 1. 28,respectively. The fluctuation response between ring- planet( R- P) is stronger than sun-planet( S-P) which is also validated by both approach studies,frequency spectra analyses identifies larger distinct rotational resonance and more frequencies under TW excitation. | He Lin Sanmin Wang Earl HDowell Jincheng Dong Cong Ma | 2016 | Journal of Harbin Institute of Technology(New Series)2016，23，4： | 3 |
您所在的机构暂未开通此部分的功能，请联系管理员