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变截面杆纵振动问题的试探函数方法

DOI: 10.6052/1000-0879-13-362, PP. 466-469

Keywords: 试探函数法,变截面杆,纵振动

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Abstract:

给出了一种试探函数法,并研究了变截面杆的纵振动问题.先给出振动控制方程的特殊函数形式的试探解,然后要求此解满足控制方程,反过来确定了控制方程各种可能的系数函数(即截面变化函数)并得到了控制方程的精确解.作为例子,给出了一种变截面杆在3种边界条件下的频率方程,计算出了固有频率.研究表明,试探函数法简单、直接,适合于研究变截面杆的纵振动问题.对于杆扭转振动、薄膜振动以及管中波传播等问题,该方法同样有推广应用价值.

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