By combining theory analysis with test measurement, the velocity attenuation regularity of projectile fragments was discussed.

采用理论分析和试验测试相结合的方法，对弹丸破片的速度衰减规律进行了研究。

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Especially, regularity as one of the constraints assure the flatness in passband and the high attenuation in stopband, even the value of stopband response is very close to zero.

尤其是本文把正则阶作为约束条件之一，从而保证了滤波器通带的平坦性和阻带的快速衰减，并且在阻带滤波器的频谱值非常接近于零。

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