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回复于
跳蚤市场
内容:容重要远小于水的比重才能实现;这样一来意味着体轻表面积大,抗侧风能力会变差,只能在低风速的天气运行,自身的速度肯定不能过快了.另外一个很重要的问题是:如果处于缓慢的浪涌上,水面是倾斜的,而球体为了保持稳定
直升机的一揽子:从控制到性能估算
徐枭涵
4年11个月前
发表于
航空技术
内容:直升机上会转变飞机控制灵敏度的是旋翼转速,当旋翼转速增加后,我们通过调小总距获得悬停,会发现有可能本来能控制的非常稳定的姿态开始震动,这是因为转速增加后因为使用旋翼角度来产生的控制力矩会二次方跟着转速增加,在实践中,发现如此修改后,px4的默认高度控制器足以稳定直升机的高度(而且表现相当惊艳),旋翼对气压计的干扰由于也较为稳定(主要还是pixhawk 2.1的cube气压计做得好)没有让飞机的高度无法控制
折腾一天做的Joule Thief circuit-悲剧了一天,最后喜剧
逆天
12年10个月前
回复于
电子技术
内容:我也比较菜按我理解的说说,接触和断开B极的时候,连在EC上的线圈它就相当于一个电感,电感是感性负载,感性负载会在导通和断开的瞬间产生阻止电流发生变化的反向电动势,这个反向电动势比稳定后的电压大数倍。
简单分享一下自己两年来做火箭飞控开发的历程,请大家指教
白沫0001
1年1个月前
发表于
喷气推进
内容:这与简谐运动有些类似,在简谐运动中,质点的加速度与位移总是成正比,小球会被拉回原点,但因为惯性,小球会继续运动,以至于往复运动,无法在原点
稳定。
,由于希望在原点附近速度接近0,因此让加速度a和速度v的比例也有关系(a=px+dv,d<0,因为希望速度减小,因此给反向的加速度),再次用Python模拟如下图:粗略地可以从图中估计出质点在1000*0.01秒时几乎稳定在原点,由此,想到直接将位移前的常数和速度前的常数改成变量,也就是类似于火箭的目的不是与极轴垂直,现在希望小球在并非𝑥=0处稳定,比如说在𝑥=1/2处稳定,此时初始条件发生了变化,依然使用Python进行模拟,,绘制的曲线如下:同样的,图象在大约600 * 0.01s之后在x=0.5处稳定,达到了预期目的。,对此依然进行一个微分方程的求解:现在使情况初始位置改变,即目标位置𝑥𝑟是任意的,而当前位置𝑥≠𝑥𝑟(事实上应该是𝑥不稳定在某个领域,因为在一定的误差内并不影响整体的控制效果),由此微分方程变成了
12V100A的同步整流电源
金坷居士
9年1个月前
发表于
电气电工
内容:UC3843类似,但是加上了TL494的功能,还允许设定反馈的参考值,电流环采用差分的方式输入 (减小干扰)如图电源采用光耦隔离的形式反馈,这样设计是因为100A电流在电线上会有电压降,为了让负载能得到稳定的
东芝1560复印机还没拆,可送,另一台已经拆了。服务器、硬防降价。
虎哥
12年4个月前
发表于
跳蚤市场
内容:这是至今为止最稳定最耐操的机器之一,以前KC打传单几千张都靠它的~墨粉40元一斤,成本极低。
最近修一台德国电视机,高压部分电路图请诸位分析指点
虎哥
14年3个月前
回复于
高电压技术
内容:2600V绕组输出经整流后,以大电阻分压,送入比较器,与参考电压相比较,以稳定输出电压。
请教关于800W离子火焰
black
15年5个月前
回复于
高电压技术
内容:的话功率顶多就是这个样子,最高也就是80~100w ,还要加在一个巨大铝板上散热,烦都烦死了........其实还不如用3525.....但是如果实在没有办法的话,就用那个传说中的图腾柱,那样的话功率可以加到几百瓦,但是不稳定
高功率激光放大器系统可靠性研究
大仙
16年0个月前
发表于
强激光
内容:因此,系统可靠性和稳定性是大型激光装置必须解决的重要问题之一。
裸体电子管耳放配AKG Q701 (重发)
淡淡的花香
11年5个月前
发表于
电子技术
内容:出口版110VAC)静态功耗:48Watts主机尺寸:300(长)*155(宽)*120(高)/175(电子管);净重:3.2kg很喜欢裸体的电路板,所以自己做了一个底座这个电路是用铜柱撑起来的,虽然稳定性一般但很方便变压器是铆钉固定的
40mm火箭发射(失败)
默言
9个月18天前
发表于
喷气推进
动手实践: 实验报导
内容:4.整体组装测量重心压心明显不稳定在头部加了些配重。
新人潜水多日发表一下子弹的自旋和稳定想法
edfish
12年3个月前
回复于
电磁炮
内容:球型弹体和圆柱弹体的能量利用率之间的分别大家都知道,就是这些想法了,先稳定不翻滚为大前提。
Re:回 2楼(20061002838) 的帖子
samhrc
12年9个月前
回复于
航天技术
内容:在一个非自旋稳定的在轨航天器上,三种方式是互为补充的。
[原创]我再再贡献下.火箭发射的小技巧..
暗剑
16年6个月前
发表于
喷气推进
内容:如果两个气球方向不一致.....还是算了吧.....有阵风谁知道会如何....如果两个气球上升的比较直,而且轨迹大致相同..那么你就正常发射吧.如果两个气球上升轨迹与水平面夹角小于45度强烈建议不要发射..注意:一个稳定的火箭会自动向来风方向飞行
我的可调发射架方案
bkh123
13年7个月前
回复于
喷气推进
内容:下孔盘(底座)既可采用竖直支脚方案,(三脚四脚都可)也可采用横向支脚方案,即等于加大了底盘直径来稳定.
【廣局神作】RNX-110規格發動機試車
焓熵`
12年6个月前
发表于
喷气推进
内容:我们要对燃料外圆进行微小加工,以保证尺寸可以顺利放入发动机内 将药柱排列,并进行编号,准备装机 出发前,测试台和发动机的合影~ 会会的手机与堵头处压力传感器~ 吸取上一次的地面测试教训,这一次为了保持测试台的稳定性,最终收集的数据曲线 通过数据我们可以发现,此台发动机的理论设计及实际测试得到了非常好的吻合,其工作压力稳定,工作时间长久同时也验证了石墨喷吼的可靠,最终很好的诠释了此次测试的成功~此刻,国内业余界最大总冲
(转载)一种过氧化氢氢化催化剂制造工艺
LS
5年10个月前
发表于
喷气推进
内容:此外,国内现行的H2O2工业生产氢化工序中,广泛使用的固定床反应器普遍存在 着传热性能差和催化剂稳定性不高问题。,因此,蒽醌法制H2O2氢化工序催化剂发展的重要方向就是开发与流化床反应器相匹配 的耐磨损、强度高的高稳定性氢化催化剂。,因此,在浆态床反应器中开发高稳定性氢化催化剂对流化床反应器中高稳定性氢化催化剂的 开发具有借鉴意义冯青琴等(冯青琴,高晓玲,吕宝义,贾晓林.不同模板剂制备介孔纳米γ-氧化铝及表征 [J].无机盐工业,2010,42,但迄今为止,同时添加Zr-、Zn-改性γ-Al2O3载体以提高催化剂氢化活性和稳定性的研究还鲜有报道。,本发明与传统蒽醌法制备H2O2氢化催化剂相比,具有以下主要优点:该催化剂具有活性和选择性好、稳定性高等优点,其氢化效率为9-11g/L左右。
GE 3d打印微型蒸汽轮机
westwarded
8年1个月前
回复于
机械与工具
内容:引用 qwe:表示很奇怪市场上为什么没有出现kw级别的燃气轮和燃料电池发电机,如果有不是能做到效率高噪音低其实燃料电池至今都又一个问题,就是太贵,输出不稳定,要严格控制电极的湿度和气体量防止电极中毒。
制取三氧化二氮
CIT天行科技
7个月23天前
发表于
化学
动手实践: 实验报导,严肃内容: 教程/课程
内容:亚硝酸不稳定,分解产生三氧化二氮(遇水直接分解为二氧化氮与一氧化氮)3HNO2→N2O3+H2O+2NO三氧化二氮分解生成二氧化氮与一氧化氮的反应是一个可逆反应,通常在提高温度时发生。
用IR2153制作高压电源(⊙_⊙)
小真-真实
11年11个月前
发表于
高电压技术
内容:原来IR2153不能用电压超过Vclamp]的低阻抗输出的直流电源,由此我推测:可能是启动电阻造成IR2153不正常工作,导致高低端同相输出使开关管共态导通,这原因大概是电源电压的波动,电路开启瞬间的不稳定等等
【电机矢量控制】处理器功能需求及控制方法
公众号EV技研作者1900
5年8个月前
发表于
电动汽车
内容:进行 180°通电时,A-D 转换时间在 PWM 通断动作时无法准确地捕捉,需要在电流稳定时进行观察。,(3)相电流相电流的检测时间,是载波周期内 PWM 输出切换后电流达到稳定时。
急出98新1920*1200超高分屏惠普图形工作站8240笔记本998包邮!
ufo008sss
12年0个月前
发表于
跳蚤市场
内容:性能超稳定!
刚画好的滤波器电路板,过两天做PCB,准备做简易ecg
harding
12年5个月前
回复于
电子技术
内容:不过相当不稳定,只是偶尔可以看见心电信号,姿态一变就看不到了。
今年最后几天的玩具..150W定频固态特斯拉线圈[已更新]
小特斯拉圈圈
13年0个月前
发表于
高电压技术
动手实践: 实验报导
内容:最新的电弧照片见14楼各种工作时候的波形图见XXXXXXXXXXXXXXXXXXXXXXXX/t/39814此TC输出烧树叶见XXXXXXXXXXXXXXXXXXXXXXXX/t/39788目前此TC已通过5分钟稳定性测试
火箭的级间分离技术
非法用户
15年9个月前
发表于
喷气推进
内容:它们有各自的发动机(一台或数台)、控制系统的部分仪器(可分离掉的)、推进剂系统、控制稳定飞行的执行机构等。,它们适时投入工作后,可避免第一级受发动机后效推力作用追上第二级所引起的碰撞,保证分离之后第二级飞行的稳定性。
悲催的494等离子弧扬声器。。。
眼睛
12年9个月前
发表于
高电压技术
内容:然后依照神之觉醒的图搞了个494(信号耦合在死区控制上,单端式接图腾输出,反激变换),漏感尖峰很高,为此秒掉8个场管,不敢用250(¥8.00/只)最后找到个捡来的irfpe50,800v的貌似,终于稳定电弧了
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