研究了由推进剂药柱和壳体组成的燃烧室结构径向振动对发动机内弹道性能的影响。
The effect of radial vibration of the chamber structure composed of propellant grain and case on the internal ballistic property of solid rocket motor (SRM) was investigated.
此后结构变化主要沿着：“在规范程序的有与无之间突破”和“叙述模式从以宣传为主向以新闻为主变化”等路径向前推进。
After that, the structure of news went ahead along following two breakthroughs: with canonical mode or not, giving priority to propaganda or news facts.
外环在内环上的推进径向地压缩内环，由此导致管的型锻。
Advancement of the outer ring over the inner ring radially compresses the latter thereby resulting in swaging of the pipe.
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