By combining theory analysis with test measurement, the velocity attenuationregularity 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.