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第198章 数学不是计算

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    第198章数学不是计算(第1/2页)
    北大楼此时已是晚上十点多。
    楼上各个办公室的灯光自八点之后便陆续熄灭。
    一楼大厅的同志目前规定在八点半后结束工作。
    只是今天哪怕已十点多,灯光依旧亮着,唯独剩下计算班的三十多位同志,以及本就会24小时值守101机的两位同志。
    “杜川,你真算出来了?”
    …
    “是啊!这题可真是邪门,明明计算思路很简单,带入个公式的事,结果却怎么也算不对!”
    “我都怀疑是这题出错了呢!”
    …
    “你傻啊!沈工这是给的实际炮弹数据。”
    “我看啊,没准真是咱们有什么东西没想到!看杜川同志吧,没准他这计算方案能算通过呢!”
    等候的时间内,同志们的交流也没停下。
    大部分人对于沈永健的题目在计算过几次后便已放弃。
    他们只是计算能力相对出挑,并不像杜川这种计算天才这般心气高,从未执着什么。
    这会儿留下,也更多是得了李少尉的消息,能听沈总工前来讲解自然不会错过。
    “沈总工!”
    卢二强最先看到沈永健,声音带着一丝急切和不易察觉的委屈。
    “您可算来了!这题…这题我都算了有上百遍,参考了绿本上的所有公式,考虑了风速、气压、湿度,甚至把炮弹形状的微扰都加了修正因子进去…可算出来的落点,总是和您给的实际值差着老大一截!”
    “也就杜川同志,他用了我们炮团压箱底的‘修正本’,才勉强把误差缩到三米内。”
    “您这题…是不是有问题?光凭公式理论上计算根本…”
    卢二强很想说这题按理论计算的偏差肯定达不到直径10米的精度,怀疑是沈总工故意为难他们。
    只是这最后几个字终究没敢说出口,但意思已经表达得很明显。
    沈永健笑着摇了摇头,要不是晚饭时李牛来跟他提醒,他差点都忘了给计算班同志布置任务的这茬。
    今晚他忙着动力谐振陀螺仪技术研发。
    这款选定的陀螺仪他只是在脑中有过判断可行,但实际理论和技术方案还得细细考虑。
    这会儿总算搞定了七七八八,趁着回屋休息前正好给这计算班的同志解惑。
    当下接过杜川的计算过程,略略扫了眼。
    整体计算不出他所料,倒是最后的一项修正值让他颇为意外。
    果然炮弹打击实战时还是有高人啊!
    “不错,修正值这项操作在实践上挺好用,不过用在我出的这题上可没法算通过。”
    杜川闻言抬头望向他,似乎对沈永健的说法早有预期,此刻眼中更多的是困惑和求知欲。
    “沈总工,我承认自己算得不够准确,没能达到您的要求。”
    “但这题真的能通过计算符合您提出的标准?这题应该就得用真空弹道公式求解吧?”
    杜川说话间,便已拿起桌上那本被翻得卷边的绿皮公式本。
    这小本是从苏方传过来的,上头写满了一系列的军事计算方程组。
    他到现在完成的各项任务皆是靠的这本小绿本,打内心便推崇这小本,从未有过质疑。
    “的确是真空弹道公式。”
    沈永健当下走到黑板前,提起粉笔,将真空弹道公式在黑板上列出。
    随后在字母g上圈了圈,言语平静地问道。
    (本章未完,请点击下一页继续阅读)第198章数学不是计算(第2/2页)
    “你们计算时,公式里的重力加速度g,是多少?”
    …
    “9.8米每二次方秒啊!”
    卢二强脱口而出,觉得这问题太基础。
    “沈工,这有什么稀奇的,绿本第一页就写着呢!难不成是这个数值有问题?”
    沈永健闻言不由得摇了摇头,随即微笑着反问道。
    “问题…就在这里。”
    “为什么重力加速度一定是9.8m/S?”
    清晰而沉稳的声音在这寂静的一楼大厅里回荡。
    整个计算班的同志,尤其是杜川和卢二强二人瞬间沉默下来,眉头当即紧皱,一副难以理解的模样。
    “这道题里高初速、远射程的炮弹,它的弹道顶点很高,飞行时间也较长,在这个高度和范围内,地球的重力场,并非均匀不变的!”
    “原因很简单,根据万有引力定律:F=G*M*m/r,当炮弹离地心距离r增大时,它受到的重力F就会减小,对应的加速度g自然也随之减小,这是一个连续的、变化的场,我们一般称之为‘变重力场’。”
    沈永健一边说着,一边将重力场方程代入。
    原本简单的公式求解立刻成了一题复杂的微分方程组。
    好在对他而言这种级别的求解并不难,再加上考虑一系列的实际阻力值,最终计算的结果同样只与实际值偏差三米。
    “这才是炮弹落地真正的计算方式,当然实际若是细究下去,还有更多可深入探究以及精确的点。”
    “只是在实际应用中,却不如依照你们的‘修正本’来得更有效率。”
    炮兵团的计算轨迹能用上真空弹道公式就已经足够,有了大致的理论值,再根据实践经验修正才是最佳效率。
    在场所有计算班的同志此刻已彻底安静,杜川和卢二强二人更是满脸震惊。
    他们愣是想破脑袋,都没敢想自己一直使用的重力加速度有问题。
    在亲眼见到沈总工将题目解出,心中只剩下了佩服。
    “我前几天出的这题,其实并不是为了证明什么,只是想给各位同志做个‘启蒙’,什么是真正的数学!”
    “真正的数学能力和数学天赋,绝非是你们认知中的计算。”
    “计算能力只是研究数学的基本功亦或是一项工具,数学本质上是一门科学。”
    “而作为科学,首要的就是学会质疑!”
    “而后再挖掘真相,总结规律,乃至学会创新。”
    “就像这题的求解,就需要你们真正理解炮弹的运行轨迹,起码也需要你们有自己推得新公式的能力。”
    说话间,沈永健目光已望向杜川与卢二强。
    原先心血来潮留的这题,只不过就是想点拨这二人罢了。
    “在座的同志们都在计算上极具天赋,甚至可以说是计算天才,若在初学数学时的确会有一定优势。”
    “但也希望大家对数学能有基本的认知,它并非是计算。”
    “甚至真正深入数学领域后,你会发现所谓计算能力反而在数学探究中微不足道。”
    “要是各位日后真的有机会进入大学,选择学习数学专业,还望提前调整好心态。”
    沈永健说罢,便放下粉笔径直离开。
    唯留下还在发愣中的众人。
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