Simultaneously, the sine sweep vibration tests are carried out to measure the vibration frequencies and amplitude which lead to operation failure of HDD.
2
通过建立相应模型，对接收喇叭的有效面积进行了计算，并在部分频率点上进行了实测。
The effective area of the receiving antenna is calculated with the established models, and measured at some points in the given frequency range.
3
其它频率点上满足宽带恒定束宽要求的复权向量可以根据参考频率上的复数权值通过折算求得。
The complex weighting vectors at other frequencies satisfying the request of wideband constant beamwidth can be deduced from the one at the reference frequency.
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