推导了固定四角薄型平板扬声器在单点激励下的振动方程，分析了在受激情况下的简正频率，并由简正频率方程导出其受力方程。
The vibration equation for thin flat plane loudspeaker with single point drive and four corners fixed is deduced and its simple harmonic vibration frequency in this condition is analyzed.
双层平板型斜放四角锥网架节点构造简单，受力合理，用钢量是四角锥体系网架中最小的一种形式，也是国内工程中应用较多的一种。
Double layer flat diagonal square pyramid grids has the advantages of being simple in formation, rational in member stressing and fairly economic of steel cost among square pyramid grids system.
分析结果表明固定四角薄型平板的振动是不规则的，在远声场振动辐射是无指向性的。
The results indicate that the vibration of thin flat plane loudspeaker with four corners fixed is anomalistic and the vibration radiation at far sound field doesn't have any directionality.
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