When a plate is simply supported at four edges, it can be solved by double sine sery method to get each properfrequency.
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。
2
Wavelet packets with the advantage of time frequency zoom is used in this paper to decompose the post fault transient electrical quantities by the properfrequency span.
应用在时频空间皆具有良好聚焦特性的小波包，以适当频率带宽，对故障后暂态电气量进行分解。
3
Extensive simulations show that combining three diversity branches with properfrequency shifts reduces BER by an order when the normalized Doppler spread is larger than 0.3.