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应用有限差分法,计算出碰摩转子的挠曲振型和截面弯矩分布的变化情况,从而直观地揭示了碰摩过程中转子截面应力的增长规律,对一些旋转机械重大事故中转轴出现多个断口的成因做了初步解释． 相似文献
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针对当前高校专业课教师在课程思政工作中存在困惑、难以有效开展的问题,结合笔者多年教学工作实践体会,从课程思政意识、课程思政方式、课程思政准备等方面讨论了做好课程思政的方法,并给出多个实践案例,以期为广大专业课教师开展课程思政提供借鉴。 相似文献
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A modified Lindstedt-Poincaré(LP) method for obtaining the resonance periodic solutions of nonlinear non-autonomous vibration systems is proposed in this paper. In the modified method, nonlinear non-autonomous equations are converted into a group of linear ordinary differential equations by introducing a set of simple transformations.An approximate resonance solution for the original equation can then be obtained. The periodic solutions of primary, super-harmonic, sub-harmonic, zero-frequency and combination resonances can be solved effectively using the modified method. Some examples, such as damped cubic nonlinear systems under single and double frequency excitation,and damped quadratic nonlinear systems under double frequency excitation, are given to illustrate its convenience and effectiveness. Using the modified LP method, the first-order approximate solutions for each equation are obtained. By comparison, the modified method proposed in this paper produces the same results as the method of multiple scales. 相似文献
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