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约找到 5783 条结果,耗时 0.324 秒
DIY一个50V 50A 最大300-500W的恒流电子负载,缓慢更新中
wwwajjlcn
9年9个月前
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电气电工
内容:考虑用自带12位ADC的单片机,或者直接用外置16位ADC得了 自带ADC尝试过了,精度与稳定性不达标,详情可以关注后续贴子。
没见今天有贴!大家来讨论一下旋转的问题。
skyline
11年9个月前
回复于
电磁炮
内容:那结构真要缩小到步枪用的体积又不是不可能,也仅仅就是个成本高而已.至于现在各国没有采用尾翼弹的木仓,只是因为尾翼弹的低阻力和稳定性过高了,2战时日本的三八大盖步木仓的那种头尖尾尖子弹就算是一种简化的极致的变种尾稳弹,,这种弹用来提高射程和穿轻装甲目标的效果是妥妥的,但这种弹形带来的副作用就是稳定性过高严重影响对软目标的杀伤力,木仓对于软目标的杀害力来自于弹丸进入目标翻滚造成的空腔效应,而扩大空腔效应又恰恰是造成弹丸尾部阻力的尾涡阻力里那个真空区域的空气回填团,,尾稳弹恰恰又是稳定性过高进入软目标后不易翻滚就原模原样的穿出目标了,尾稳弹减少尾涡阻力的优点这时候也会变成缺点,没了尾涡阻力弹体效率提高的同时尾部的真空效应也消失了回填真空区域的空气带不进被穿的软目标内,战时候被常规弹击中的士兵不管打到任何部位不死都是重伤瞬间就会失去继续战斗的能力,被三八大盖击中的士兵只要没被打中要害往往都能坚持继续战斗.所以,现在各国不装备尾稳弹木仓的原因只是尾稳弹制造成本过高不划算再加上尾稳弹先天的高速远射程的优势在打击软目标时候会造成弹体过于稳定对软目标杀伤效率不高的缺点
自制小涡喷有一段时间了,发帖报告
电子Q
6年1个月前
回复于
航空技术
内容:电喷的想法却真的是不可能实现呢关键问题就在于当前电动机所能给的压气机的功实在是太小了,达不到我们所需要的压比和流量的要求...3D打印的结构不是很稳定,youtube上倒是有毛子用的金属电压气机你的串联涵道和离心压气机本质上可以算一级轴流风机配上离心式压气机
冒个泡(电炮与金属风暴结合)
潜伏者
15年8个月前
发表于
电磁炮
内容:目前的电炮形式主要有磁阻线圈试、电热式、重接试、轨道式、本人也曾经想过把磁阻线圈试与加特林结合,但是受到很大的限制,旋转重量,整体复杂度,整体稳定性,等等都不能很好的解决。
测速器制作
MicroSound
10年7个月前
发表于
电磁炮
内容:测速器基本上是做CG实验的一个必需品,因为没有测速器很多时候靠感觉总是有很大的误差,因此下决心一定制作出一个测速器来再进行后续的实验 第一个版本: 这个版本不太稳定,有时可以测出,有时又不行,很是郁闷
4元钱金属发动机试飞成功,大家来膜拜
拔刀斋
15年7个月前
回复于
喷气推进
内容:我看到他们用车床车一个金属发动机上百块,有些的连玩具车都推不动,所以我就想把简单的金属发动机制作方法告诉你们呀,我总结了个经验,如果想要火箭初速高,就应该增加火箭发动机的直径,而药柱的内孔最好要大于药柱直径的一半,箭身细长一点稳定
火箭如何配重
St_Maxwell
9年9个月前
回复于
喷气推进
内容:总之结论是,为了保证火箭飞行的稳定,重心应在压心之前至少一个箭体直径位置(之前即指靠近箭头一端)。
ABC教程贴之各种电点火头制作
幻痛的心
11年3个月前
回复于
喷气推进
内容:充电电池有保护板(过载保护),电极过小,不易按压和接触,稳定性也差,有火花,但没有明火。
化学键归类,有助于揭示化学变化的电子偏移原理
白先森
11年10个月前
发表于
化学
内容:例如,两个氢核同时吸引一对电子,形成稳定的氢分子。,(一吸,两斥) 成键原因:①原子相互得失电子形成稳定的阴、阳离子。,量子理论建立以后,1927年 W.H.海特勒和F.W.伦敦通过氢分子的量子力学处理,说明了氢分子稳定存在的原因 ,原则上阐明了化学键的本质。,编辑本段共价键 1.共价键的形成是成键电子的原子轨道发生重叠,并且要使共价键稳定,必须重叠部分最大。,如果还有其他的原子参与成键的话,其所提供的电子将会填入能量较高的反键轨道,形成的分子也将不
稳定。
液態呼吸術
用户已注销
16年5个月前
回复于
极客DIY
内容:全氟化碳(perfluorocarbon ,PFC)是碳氢化合物中的氢原子被氟原子取代后形成的一类化合物,常温下PFC为无色无味的透明液体,挥发速度略快于水,理化性质极为稳定,与水、血液、脂类及其他介质不相溶
一种家用型大功率微风风力发电机系统
风电氢能
9年2个月前
回复于
极客DIY
内容:阻力式风机虽然无法输出稳定的电流,但是只要配套一个电解氢制备厂就能将电力完全转化为氢气,最终产出的经济收益远高于传统风机场。
我国含能领域研究的偏爱氮杂稠环酮类/呋咱类硝胺化合物最新文献
dracula1429
10年9个月前
发表于
化学
内容:5、热稳定性欠佳。
高压包的那几个脚是什么作用的?
暗剑
16年6个月前
回复于
高电压技术
内容:+B2——高压初级线圈的输入端抽头,没有二次电源的机型就在高压包内设多个抽头,以保持不同行频下的高压
稳定。
,+B3——高压初级线圈的输入端抽头,没有二次电源的机型就在高压包内设多个抽头,以保持不同行频下的高压
稳定。
人工孵化喂养野鸽子,持续更新中
虎哥
6年6个月前
回复于
生物学
内容:上初中时用包装水果的泡沫自制过一个孵化器,里面用两根电热丝接上一个24v变压器(隔离用)+调压器组成加热系统,上面用塑料袋装水降低温度波动,开环控制,用温度计测量总结经验,最后温度稳定在36-40度左右
使用热水器等家电平衡电网负载
玄明
5年5个月前
发表于
极客DIY
内容:为了解决这些问题,我们发明了数不清的昂贵机械设施来稳定电网的电压……可是我想这个问题也许并没有那么复杂。,因为电器的数量是如此的庞大,其中几万台设备离线或故障根本无关痛痒,即使不使用单电器的功率调整功能,整个电网系统的动态依然是线性的、稳定的。
【自己动手丰衣足食系列连载】自制实用线性多路可调电源
立棍
13年6个月前
回复于
电子技术
内容:大大提高稳定性。
自制一台玩具级的单导联心电图绘制器
虎哥
3年0个月前
回复于
电子技术
内容:最近做过两次动态心电图,一家小医院的提供的设备,在运动时波形完全杂乱,只能在静止不动时出稳定波形;另一家大医院的,基本上各种状态都能得到比较干净的波形。
关于死区时间发生器的改进
任某人
13年3个月前
发表于
电气电工
内容:从反相的处理上来看:上部输入采用了一个或非做反相,但是由于或非门输出有较大坡度,容易造成下一级读取电平不准确,降低了稳定性,因此我在此处换为了反相施密特。
测试放电管大电流下的导通压降以及击穿电压
Ball_Lightning
2年5个月前
回复于
电磁炮
内容:那么多稳定触发的案例,让人不得不怀疑有什么更深层次的原因导致一侧击穿后另一侧能继续击穿。
一次电动车直流无刷电机控制器的设计
novakon
9年4个月前
回复于
电气电工
内容:矢量控制可以减小转矩波动,但廉价产品没有编码器,于是就通过换相后给满占空比,直到换相后电流与换相前一致来实现换相时的转矩
稳定。
问:热冰
a403564804
15年9个月前
回复于
化学
内容:实验目的:认识过饱和溶液及过饱和溶液不如饱和溶液
稳定。
求方法:水杨酸做去鸡皮化妆品 怎么溶解?
空中米格
12年1个月前
回复于
化学
内容:另外发现由于水杨酸膏体ph值较低,影响了乳化剂的稳定性,要多加乳化剂,此次试验乳化剂浓度就达到了4%左右。
仲裁者55C隔板式双脉冲固体火箭发动机的设计与研究(未完待续)
Blizzard
3年10个月前
发表于
喷气推进
内容:使用制作工艺较为完善,性能较为稳定的硝酸钾基复合推进剂KNSB。,Pb:爆破压强 D:爆破隔板夹持直径 K:修正系数(304钢K计算时取2450) δ:爆破隔板厚度 备注,拱高h一般取D的1/5到1/6这样爆破压力较为稳定
自制数显电子温度计(不用单片机)
NPS_2750X
1年1个月前
发表于
仪器仪表
电子技术
动手实践: 实验报导
内容:作为常见的LDO器件,他输出可能不会是正好1.2V,但比较稳定,再配合可调电阻,足够了。
CRS_木星试验——成功与失败
3ha510
15年4个月前
发表于
喷气推进
内容:重心和压心的关系,我用spacecad怎么算重心都在压心前面,甚至在尾巴上加了100g的配重,重心竟然还是在压心前面,我就感到很奇怪了……实际上这支火箭有犯了很早以前发射的CR-1R的问题,也就是严重不稳定
生命不一定需要水
yy+sy
15年8个月前
发表于
极客DIY
内容:这是因为,在地球气温下,既是最良好溶剂,又能有足够高的沸点,足够低的熔点,足够大的比热容,足够高的稳定性的简单物质,只有水。
[硝团子工作室出品]关于一次性发动机的点火药固定问题的解决方案
薄荷糖MasQ
2年7个月前
电波长电文
内容:等稳定性较高的燃料。
新人大家支持一下吧 请问这种烟花火箭用的是什么燃料(一种白色固体燃料)
yanglurong
15年6个月前
回复于
喷气推进
内容:啸叫声可能是其塑料尾部喷管受热发生变形压缩燃气所致(尾部喷口变窄畸形) 我把“窜天猴”塑料喷管中套上纸做隔热层在次试验发现没有明显的啸叫声 而且装上纸绝热层后塑料壳体未在发生变形 这样还有利于提升窜天猴发射后的稳定性
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