NGHIEN C O U - T R A O D O I XAY DUNG MO HINH T I N H TOAN Op MAT CAN BANG CUA DAU DAN SUNG BO BINH A NUMERICAL MODEL OF BULLET-HEAD UNBALANCE Nguyen Thanh Dien Hge vien Ky thuat Quan su TOM TAT Bdi bdo dua mo hinh tinh todn mdt cdn bdng eUa ddu dan siing bg binh dua tren phuang phdp md phdng Monte Carlo Ap dung mo hinh vira xdc lap de khdo sdt dnh huong cua cdc sai sd gia cong cung nhu quy trinh cong nghe sdn xudt ddu dgn din mdt cdn bdng cua no Tinh todn CM thi duac dp dung cho ddu dgn 7,62x39mm Tir kh6a: Mdt cdn bdng, cdn bdng dgng, ddu dgn, ngdu nhien ABSTRACT The paper presents a numerical model for simulating the unbalance of bullet head The model is based on the Monte — Carlo method and applied to investigate the influences of manufacture errors and technological factors on the bullet unbalance The analyzing results for 7,62x39mm bullets is shown as an example Keywords: Unbalance; Dynamic balance, equilibrium, bullet head, randomness DAT VAN DE va anh hudng Idn den can bing cua dau dan Khi thilt kl va san xuit diu d^n, ngudi ta ludn mong mudn cac phan tu ciia dau dan la , , ^ cac v^t CO cung true quay, hue doi xung hmh !,ô ,A 4R 1, T u-" ^ '