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发表于
电动汽车
在弗莱明定则下产生转矩 无铁心电机是在弗莱明定则下产生转矩的,是原 理简单的电机。磁场中的导体在电流通过时产生力。转动的电机会产生下列现象。(1)转动的电机总是在线圈上产生感应电压 电机转动的时候,转子的永磁体产生的磁通量切 割线圈(导体),产生感应电力而形成电压(感应电压), 这就是弗莱明右手定则。这里的感应电压,在电机转 动的过程中,无论对线圈是否施加电压都会产生。 (2)通过从线圈的感应电压...
氯化铵的工业
制造
方法?
porominix
14年4个月前
发表于
化学
做仪器分析实验,ICP检测得氯化铵试剂中Na、S和Ca三种杂质元素含量最高,依次为百分之0.0139,0.0020和0.0014,余下各种杂质元素的含量(%)都是0.1~1ppm数量级的了。就想知道这三种元素是怎么进到氯化铵里的…
国外精品机械:瑞典
制造
超薄型机械式三爪自定心卡盘外径127,盘体厚度40.5毫米
tongbaoa
13年0个月前
发表于
机械与工具
内容:瑞典
制造
的,这个是瑞士名牌肖柏林精整车床上原配的超薄型卡盘,干过机械加工朋友会体现出超薄型卡盘的用意的,卡盘薄可以节约出宝贵的加工行程,并且有助于提高装夹精度
详解模型火箭箭体,发射架
制造
及一次成功的火箭发射
极度深寒
12年6个月前
发表于
喷气推进
内容:鉴于对坛内大多数人火箭箭体设计和
制造
的太随意,我结合以前发过的资料做个详细说明(详细资料下载请前往此处 XXXXXXXXXXXXXXXXXXXXXXXX/t/41379)本次演示的火箭由25mm线管做箭身,理想的模型火箭长度直径比为10:1(含头锥,尾翼等在内)我
制造
的这枚火箭直径2.5cm 长度30cm,(这并不是理想值,由于发射筒的限制只能这样了)2要确定头锥的形状及长度头锥的长度与直径比接近5时,总阻力最小
劳斯莱斯 涡扇发动机的
制造
清纯小萝莉
11年0个月前
发表于
航空技术
点击此处查看视频
回 6楼(精密
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) 的帖子
rudolf
12年10个月前
回复于
会员海报
明白了。不过那样的话走线会比现在麻烦一些,当然也会更加专业。现在的走线反面没有上图,左边全部用来连接电容的一脚和高压包的一根线,右边同样也是这样,中间留出半公分宽的一道连接磁环和高压包的中间抽头。以后使用中发现的各种问题,肯定会改进的。
回 3楼(精密
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爬行动物
12年10个月前
回复于
会员海报
高频大电流电路镀锡不好吧
模型火箭降落伞的
制造
1989sean
15年7个月前
发表于
喷气推进
rt,本人高中时参加过学校的箭模小组,这就是我们当时制作降落伞的过程,这种降落伞主要是用于20mm的火箭的.如果是小型火箭或是对滞空时间要求不高的话,可以适当减小降落伞的直径.
火箭模型设计
制造
手册
123456c
11年8个月前
发表于
喷气推进
不容易找这个
石膏材料喷口
制造
过程
火箭推进实验
3年4个月前
发表于
喷气推进
金属喷口具有耐高温耐腐蚀的特点,但是金属的密度高等体积下金属质量大,不利于火箭轻量化设计的特点。而且金属不易加工对普通人来说必须需要车床才能加工。――――――――――――主要是金属加工太贵了一个小喷口要我200 一开始我打算采用陶泥材料再配合模具一体成形模具如图:后来发现陶泥太硬了塞不进模具里。我又加了点水稀释陶泥然后灌进模具里。一段时间后我打开模具发现里面的陶泥还没有干,我...
牛人
制造
手持版特斯拉
唉唉唉!
10年6个月前
发表于
高电压技术
XXXXXXXXXXXXXXXXXXXXX/us/118862915/XXXXXXXXXXXtml 求大神仿造
回 楼主(精密
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) 的帖子
金坷居士
12年10个月前
回复于
电气电工
确实是个bug = =我有时间了把它修修... [s:274]
大家来说说喷管的
制造
smvkzc
17年11个月前
发表于
喷气推进
喷管大家都是怎么弄的啊?我准备用水泥,但感觉有点重。打家来说说具体的制作方法啊。用什么材料?最好常见的。还有就是喷管的外径与喉管的直径的具体大小是怎么确定的,有什么标准没有?
SD卡是怎么
制造
出来的?
猎鹰
13年2个月前
发表于
电子技术
点击此处查看视频
新的火箭头锥
制造
方法~~~~
helium
14年6个月前
发表于
喷气推进
此法为本人自创~~~~~~~~1.工具:圆锥形吊线锤、剪刀、圆规、尺子、笔。2.材料:若干白纸、胶水(粘纸专用,最好是固体胶)。3.做法:用圆规在纸上画一个圆或一段圆弧(优弧),半径由实际情况而定,过圆心画一直线把圆截成 两个半圆,把圆弧(优弧)截成一个半圆;用剪刀将圆或半圆剪下来,若是圆,则要用剪刀 沿画好的直线将圆剪为两个半圆,用此法剪10个及以上的半圆;在半圆上涂...
火箭设计
制造
核心条例
阿丕
17年10个月前
发表于
喷气推进
1.高度变化引起的压力推力变化量占总推力的10-30% 2.提高排气温度,减小排气分子量都可以改善发动机性能 3.过度膨胀和欠膨胀都会稍稍降低排气速度,从而造成能量损失 4.所有喷管壁,特别是附面层可能很薄的进口段和喉部,表面都应该很光滑,以防止流体被扰动。因为圆形边缘可能造成过度膨胀和流体分离,所以喷管出口段都具有锐形边缘 5.如果火箭以相当高的初速度从飞机发射或者靠绕弹轴自旋达到稳定,则其飞行...
回 2楼(军火
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RodTech
11年9个月前
回复于
强激光
就是有一大堆电容并联起来 或许用铜排或许用电线。
Re:CM25 B等级发动机
制造
20老黑
16年3个月前
回复于
喷气推进
想知到发动机的配方? [s:255] [s:255] [s:255]
[ZT]最高人民法院 关于审理非法
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、买卖、运输枪支、弹药、爆炸物等刑事案件具体
hamdad
17年7个月前
回复于
电磁炮
内容:最高人民法院关于审理非法
制造
、买卖、运输枪支、弹药、爆炸物等刑事案件具体应用法律若干问题的解释 (2001年5月10日最高人民法院审判委员会第1174次会议通过)法释〔2001〕15号为依法严惩非法
制造
,依照刑法第一百二十五条第一款的规定,以非法
制造
、买卖、运输、邮寄、储存枪支、弹药、爆炸物罪定罪处罚: (一)非法
制造
、买卖、运输、邮寄、储存军用枪支一支以上的; (二)非法
制造
、买卖、运输、邮寄,; (四)非法
制造
、买卖、运输、邮寄、储存手榴弹一枚以上的; (五)非法
制造
、买卖、运输、邮寄、储存爆炸装置的; (六)非法
制造
、买卖、运输、邮寄、储存炸药、发射药、黑火药一千克以上或者烟火药三千克以上,(一)、(二)、(三)、(六)、(七)项规定的最低数量标准五倍以上的; (二)非法
制造
、买卖、运输、邮寄、储存手榴弹三枚以上的; (三)非法
制造
、买卖、运输、邮寄、储存爆炸装置,危害严重的; ,第三条 依法被指定或者确定的枪支
制造
、销售企业,实施刑法第一百二十六条规定的行为,具有下列情形之一的,以违规
制造
、销售枪支罪定罪处罚: (一)违规
制造
枪支五支以上的; (二)违规销售枪支二支以上的
Re:CM25 B等级发动机
制造
kevin
16年3个月前
回复于
喷气推进
发现考古的…
【开源】飞鹰一号探空火箭——箭体设计、
制造
回顾与仿真对比
飞鹰航天
1年11个月前
发表于
喷气推进
内容:飞鹰一号探空火箭——箭体设计、
制造
回顾与仿真对比1 总体设计方案1.1 设计目的 ① 整合现有资源,设计探空火箭 ② 采集飞行数据以供研究1.2 设计指标 ① 长度小于1000mm,2 具体结构设计结构上采用硬壳结构,除了各段外壳采用纸筒外,其余部件均为pla材料3D打印
制造
。,通过将仿真结果和飞行记录分析,可以判定火箭设计、
制造
工艺是否达到设计目的。 ,⑩ 采用分段设计、
制造
时,需要注重各段之间的干涉,工艺上要考虑不同段同轴度的问题设计相关资料:
[分享]NG
制造
成功,QQ:215197215
mass_lynnxy
19年2个月前
回复于
电子技术
发烧追求的是音质,只是功率的扩大没有意义的。
我想
制造
激光,谁能给些资料啊
核武专家
15年11个月前
发表于
强激光
RT 谢谢
Re:CM25 B等级发动机
制造
20老黑
16年3个月前
回复于
喷气推进
强人 [s:94] [s:94] [s:94]
Re:CM25 B等级发动机
制造
wudan
16年3个月前
回复于
喷气推进
好也 好也
我的
制造
最后的ZY-J系列
箭zy-h2
14年0个月前
发表于
喷气推进
只是最后的ZY-J系列火箭,也是初玩火箭的一些经验成果 发动机是之前做燃料柱的模子,因为加了增塑剂,粘住了,拧不出来了。所以干脆那它当发动机算了。 这个是ZY-J4火箭,初始阶段每一个火箭都有巨大的改进··········不过我还是不想做发射架 所以还是用硬纸做了个可以支撑火箭的导向翼。 用另一个模子做了3个药柱,很小的。 那一跟药柱出来做出了我的ZY-J5火箭, 想着ZY-J 系...
中国浙江大学
制造
出世界最轻材料:超轻气凝胶
胜汪大仙
11年10个月前
发表于
机械与工具
内容:制作简便 形状、尺寸可任意调节,大规模
制造
成可能 在实验室,记者看到了一个个大小不等的“碳海绵”:它们大的如网球,小的如酒瓶塞。,高超课题组另辟蹊径,探索出无模板冷冻干燥法:将溶解了石墨烯和碳纳米管的水溶液在低温下冻干,便获得了“碳海绵”,并且可以任意调节形状,令生产过程更加便捷,也使这种超轻材料的大规模
制造
和应用成为可能。
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