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家园 不是完全对 炮弹在炮管里不是匀加速，20000G是初始加速度，加速度衰减的很快。
本质上是爆炸的发射药的火药气体膨胀，推动炮弹在炮管里加速，所以，随着炮弹在炮管里的行程，火药气体体积变大，压力和温度都会下降，对炮弹的加速度也就会大幅下降。所以，炮管越长，初速越高，但太长了，起的作用就不是太大了，因为加速度衰减的很厉害。
正确的方法是，先写出气体的膨胀方程，然后就可以导出加速度对炮管位移和时间的函数，然后再积分就是了。
河里有没有北理工的，把公式抄出来。
炮弹的炮口初速都是可以查到的，那会到第三宇宙速度，楼下说笑了。
家园 还是理工科的讨论好 VT信管看老冰的书知道的！
不过没楼主这么好琢磨！
ps：最后一段 有无可能泄密
还是理工科的讨论好
越讨论越接近真理！
文史哲类的，说着说着就各说各话了！
家园 所以我们的世界越来越先进的同时也乱个没停
家园 这个技术后来在非军用领域也有应用。 金属探测器，不光是探雷和安检，正规的食品工业流水线上就得有，防止万一混进金属物。木材加工厂带锯机上，上木材前要经过金属探测，以院木材上有铁钉，带锯碰上金属很容易断，造成的危害是相当大的，曾有木工因此而削去半个脑袋。
还有机械上用的非接触式接近开关，或者叫限位器。
家园 好像不太一样，您说的是涡流检测，引信是射频。
家园 电池部分是加拿大提供的。 Canada supplied the design for a dependable power supply, which had to have long storage life but produce instant power to the little radio transmitter as the shell left the gun.
Regular tiny batteries, with their limited shelf life, were useless, but scientists at the National Research Council in Ottawa, working with industrial scientists in Toronto, produced the answer: a battery that would remain dormant until activated by acid from a tiny vial broken within the fuse by the shocking wham of the propellant charge sending the shell on its way.
Blackburn, George G. Where The Hell Are The Guns? (McClelland & Stewart, Inc., Toronto, ON, 1997) ISBN 0771015046 Appendix J
家园 给楼主添两张图。 MK53 MOD 5近炸引信的剖面结构图：
“湿电池”结构示意图：
[提示：原图站已失效]
Reserve Energizer
The reserve energizer is located in the fuze body cylinder, with its contact clips receiving the contact pins of the transmitter-receiver. It is the source of electric power for operation of the fuze. It is composed of three compact wet-type batteries; the "A" battery, "B" battery, and "C" battery. The electrolyte for the batteries is contained in a glass ampoule mounted in a soft plastic cup in the central cavity of the energizer. The ampoule rests on the breaker which fits into the bottom of the plastic cup.
The plates of along-type energizer such as Energizer Mk 5 Mod 2 (fig. 2) are made up of flat zinc washers, coated on one side with carbon and assembled in a stack surrounding the ampoule. They are separated from each other by means of insulating washers at their inner and outer rim. The whole assembly is contained in a metal can lined with plastic. Holes in the zinc washers permit distribution of the electrolyte when the ampoule is broken.
When the electrolyte is distributed, each cell develops a small voltage. The "A," "B," and "C" batteries are composed of the correct number of cells connected in series or parallel to produce the required voltage and current for each. The leads from each battery are connected to the proper contact clips on the energizer cover. Other wires pass directly through the energizer from the contacts on the cover to those on the bottom, and serve to connect the squib and safety switches in the rear fitting to the rest of the electrical circuit.
A short energizer was developed for use in the small compact fuzes used in the 3"/50 projectile, and for use in the spin rocket fuze where employment, of a spin breaker was necessary.
In the short energizer, shown in figure 2, the battery plates are smaller and of different material and are arranged in banks parallel to the longitudinal axis of the energizer. The fundamental operation of this energizer is identical to the longer model.
按照美海军部军需处“近炸引信使用手册”的介绍，电池组件内包含A、B、C三组电池，各由数目不等的小单元组成，以串、并联方式获得驱动电路所需的电压和电流。
关键词(Tags): #国防科技，家园 谢宝！吹一下你画的图求疵 二战的时候，战场上还没有后掠翼飞机。所以印上了膏药旗的日本飞机看起来太现代了。换成平直翼的吧。
家园 貌似楼主算错了 炮弹的加速度可以高达20000个G,一个 G 是 9.8米/秒2， 20000个 G 就是 196，000米/秒2。按这个加速度，那个大炮发射的不是炮弹而是宇宙飞船。呵呵。