This paper is to introduce a simple,direct means of solving the undamped Duffing equations in nonlinear vibration,by using Mr.He＇s frequency-amplitude formula,the solution is highly precise,and the method of solving is effective and worthwhile in accordance with numerical simulations.%对于非线性振动中常见的无阻尼Duffing方程,通过何氏频率-振幅公式,给出了一种简单,直接的解法,所得的解具有较高精度,数值模拟表明解法是有效的,具有一定应用价值。
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