当板的四边为简支时可用双正弦级数解法来求得各阶固有频率。
When a plate is simply supported at four edges, it can be solved by double sine sery method to get each proper frequency.
假定波浪为正弦波，利用曲线积分和幂级数展开推导出板形公差。
Provided that the buckle as the sine-wave, the shape tolerance can be deduced by using the power series expansion as well as the curve integration.
其方法是把一个正弦波加到两个垂直板上。
This is done by applying one sine wave to the two vertical plates.
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