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【转】space CAD使用教程
卡拉什尼科夫
10年6个月前
发表于
喷气推进
严肃内容: 教程/课程
内容:也可以自己设计模型火箭头锥、筒段、尾翼,降落伞、活塞等,对其使用材料、质量进行随意选择,并可估算出模型火箭的质心和压心位置,判断出模型火箭是否具有稳定性,以便及时进行改进工作。,SpaceCAD 4[/size][/color][color=black]软件中进行设计、和估算[/size][/color][color=black][font=宋体]质心和压心位置,判断模型火箭是否具有稳定性,[/size][/font][/color] 图11 七、 图12 预览测试模型火箭稳定性和估算飞行高度[p=null, 2, left] 图14 图13 单击stability,按钮,软件即可显示出模型火箭重心(质心)和压力中心(压心)的位置,如果质心在压心前面(指相对于箭头方向),模型火箭是不稳定的(图13),须在头锥中加适量配重或增加尾翼面积。,black][font=宋体])[/size][/font][/color][color=black][font=宋体],[/size][/font][/color][color=black]软件预测出的稳定性
目标!12.7毫米电磁驱逐舰主炮
六分仪
10年9个月前
发表于
电磁炮
内容:得看我能在截止前弄出多长的线圈 自带供弹机,虽然是参考手木仓设计的 弹药为橡胶平头加上稳定翼的金属弹身,空心 黑科技弹药---火箭增程弹。。。
求助:简易的大功率射频发射器的制作
拔刀斋
15年1个月前
回复于
电子技术
内容:这个发射机只追求了功率,没考虑频率稳定度和谐波等指标,仅供试验之用。
CCPS-行包极限电弧【230V@3.7A】
rb-sama
12年11个月前
回复于
高电压技术
内容:可以看到我手中的红外测温枪随时在检测半桥的温度 最终测定温度与室温仅相差20°C 到了最后 由于功率达到了惊人的800W 仅为5W功率的吸收电阻发热太严重 被迫加快了实验的进行 我把调压器加到了230V 交流输出的档位 抓拍了一张电弧稳定时的高清图片之后
[风行动]科创基金A申请:BY2HIT业余卫星小组活动
bg2bhc
12年6个月前
发表于
科创基金
内容:技术指标运行轨道:N/A姿态控制方式:对地三轴稳定控制测控通信:UHF上行/下行电源功耗:N/A有效载荷:温度传感器或其他简单传感器热控:N/A质量:不大于1 kg寿命:N/A3.
电工电子技术文章汇总——不能错过
yoto17
14年6个月前
回复于
电子技术
内容:PC带来了更大的软件灵活性和更多的性能,而PLC则提供了优良的稳定性和可靠性。,但是随着控制需求越来越复杂,提高性能并同时保持稳定性和可靠性就成为公认的需要。 ,开放式、模块化体系结构——设计和技术标准与规范必须是在实现中开放的、模块化的和可结合的 PAC给PC软件的灵活性增添了PLC的稳定性和可靠性。,LabVIEW软件和稳定、实时的控制硬件平台对于创建PAC是十分完美的。
转贴--电涡喷~视频和原理图
xz99521
14年5个月前
发表于
喷气推进
内容:概念试验机,做的比较粗糙,压气机为小型电动离心压缩机,压力3200pa(换大功率无刷电机后还可以大幅提高压力)燃料是丙烷.燃烧室是不锈钢桶,开了一些斜向缝,试验证明能让火焰产生漩流,能起到稳定火焰的作用
火箭技术改良
科学狂人1996
11年6个月前
发表于
喷气推进
内容:只是较难加工 但是如果多次使用的话 我觉得用铝材是不错的选择 有条件的还可以选择TC4燃料:大部分兄弟都是单独地使用RNX或硝糖,不知道有没有人想过把它们搭配起来RNX的优点是 安全又稳定
第一次发射火箭,很郁闷,不是火箭一样发射上去的,而是炮弹一样炸上去的
aoqishengtia
12年2个月前
发表于
喷气推进
内容:我觉得重心和压心位置都算是稳定的那种,药柱14mm直径,3.5-4厘米高,火箭没有单独发动机,因为是第一次做,所以整体的看看效果,总重量70g。
新书:无感FOC入门指南
科创供销
1年7个月前
发表于
会员海报
电气电工
内容:基于锁相环的控制一般都比较稳定,位置信号比较平滑,低速特性比较好,适合转速不高的应用,如滚筒洗衣机的直驱型外转子无刷电机。
土地财政:历史,逻辑与抉择
虎哥
7年2个月前
发表于
经济学
内容:3.2“人的城市化” 真正用来满足需求并成为经济稳定之锚的,是保障房供给。,保障房“广覆盖”,为城市化的高速发展提供了一个巨大的社会稳定器。,它可以在利益急速变化的发展阶段,极大地增加整个社会的稳定性,扩大执政党的社会基础。,一旦原始资本积累完成,城市化进入稳定下来,其历史角色就可能逐步淡出,甚至最后终结。
一枚火箭的理论高度计算
Z聚变
1年8个月前
发表于
喷气推进
内容:代入计算器得到结果,氧化剂流量459.2.6/s,燃料流量208.72g/s 总667g/s喉口直径12.4mm,出口直径41.84mm,扩张比11.37燃烧室内径62.04mm,长度93.94mm飞控尾翼稳定
低成本开源火箭
ouybg
1年4个月前
发表于
喷气推进
动手实践: 实验报导
内容:空气动力有差错,虽然做出了一个冯卡门曲线计算器,但是还是不会用SW直接建模,因此我目前是算出之后进行放样——工作量极大,并且尾翼也是没有设计过的,就一个三角板,同时作为配重和稳定尾翼使用。
80M 波(3.5xxMHz)简单发射电路
nmjnsjj
13年3个月前
回复于
电子技术
内容:为了使输出幅度稳定,应该改成振荡器一直工作,调制信号控制电子开关选择是否把振荡器的信号送到功放上。
专家建议:如何选购节能产品
大仙
16年5个月前
发表于
电气电工
内容:这种“超低价”的节能灯多数质量不稳定,可靠性差,容易出现使用寿命短、亮度不够、光感不自然等问题,最终并不“节钱”。
是什么导致了“8·27”儿童网络baoli事件
adeng2002
15年4个月前
回复于
科学技术学
内容:“稳定压倒一切”,这应该是句常用语了,但就是这句话造成一个奇怪的结果,构建和谐社会,和谐竟成为了一个动词,成为一种手段,为和谐而和谐。
探讨:文明之锁
量子隧道
6年1个月前
回复于
科学技术学
内容:那需要跟随一颗能够稳定几十亿年的恒星,或许周围要比地球更不容易受到宇宙灾害事件(天体相撞,新星爆发,引力扰动等等)的影响。
科创的科学家们,请来这里畅想未来十五年
仿生
9年9个月前
回复于
科学技术学
内容:仿生动力装甲,外骨骼的升级版,小威力弹药免疫,拥有很强的机动性,电动汽车升级版,拥有快充和长续航能力,只需要飞轮电池作为储能及输出主体,锂电池作为设备稳定能源,超级电容作为输入,还有天然气燃料电池也很有前景
【教学】COM基础选讲
acmilan
9年4个月前
发表于
软件综合
内容:COM 的唯一标识符——GUID、CLSID、IID 系统中COM的组件和接口众多,COM开发者遍及全世界,为了避免名称相同造成的系统错乱和程序不稳定,COM使用GUID在系统范围内区分各个组件和接口
对投篮问题的数学模型研究
lrr108114114
5个月20天前
发表于
数学
内容: .因此篮球入筐的条件为 2.无空气阻力最优投篮条件模型从直观上看,出手速度越小,投篮越稳定
冲压发动机原理与技术
鹰图小盆友
4年9个月前
发表于
喷气推进
内容:主要由进气道(捕获来流)、燃烧室、火焰稳定器、喷管组成。,(有无数人在研究超声速下雾化特性,这也是直联台实验研究内容之一)2) 火焰
稳定。
,燃烧室内的凹腔凹腔稳焰的主要原理就是利用超声速气流在凹腔产生一个稳定的亚音速区(旋涡),从而保证有一个稳点的“火源”。,这种常用来研究超声速火焰稳定性、燃料雾化特性。
层流质量流量计在氢燃料电池汽车检测行业的应用
westwarded
3年0个月前
回复于
仪器仪表
内容:解决办法要么增加燃料电池体积和重量,要么增加动力电池作为应急高功率输出,燃料电池稳定供电。,氢气最大问题是会穿透材料漏气,而且液化后稳定非常低,需要更高级别特种材料制造。
【原创】高效氧化剂 --- 高氯酸钾的制备。
mithril
16年1个月前
发表于
化学
内容:它可以作固体火箭推进剂材料,也可以成为烟火药的主要成分,他的稳定性比氯酸钾要高,更重要的就是它能够与硫,磷等还原剂长期共存不分解。
火箭基础知识手册【包含板块索引】(新手必读)
leeqingyang
13年0个月前
回复于
喷气推进
内容:各成分间的关系 增加硫的含量会增加燃料的燃速,同时燃料更易点火,对冲击和摩擦更加敏感,危险性增加.所以我只推荐5%的硫含量 减少花生油含量会使燃料稍增加,但燃烧更不稳定,成型性变差.增加花生油会降低燃速,,成型工艺性好,加入量过多同样会造成燃烧不稳定.可用的加入量为:每10克燃料---5滴--15滴.推荐加入8滴.,研磨一定要仔细,颗粒过粗会造成燃烧不稳定无法形成推力 各种成分研磨好后,准确称量 硫和碳最好一起研磨.但千万别把硝酸钾和碳或硫混合研磨.
一种家用型大功率微风风力发电机系统
风电氢能
9年1个月前
回复于
极客DIY
内容:在风力多变地区能够稳定发电么?
欧洲首次捕获到反物质原子
虎哥
14年2个月前
发表于
极客DIY
内容:研究小组证实,从他们制造的1000万个反质子和7亿个正电子中,共形成了38个稳定的反氢原子,每一个反氢原子的存在时间只有十分之二秒左右。
尝试铀玻璃制作+伪铀玻璃
异极
7年5个月前
发表于
极客DIY
内容:保持稳定加热28分钟(气罐没气了) 自然冷却两个小时。
科创论坛第七届年会在广东省广州市举行
科创网
9年5个月前
发表于
社区公务
内容:张鹏分享了在FDM打印机市场领域的经验,介绍了他的团队——3D造梦工厂的新产品:ZM-1,并用这台打印机为火箭打印整流罩,打印机的稳定性得到了代表们的好评。
两种railgun的实验记录
三水合番
3年10个月前
回复于
电磁炮
内容:可以试试在弹丸前面贴一小块塑料,让弹丸保持稳定,如下图在这个储能下,想要继续提升性能,潜力恐怕不是很大。
另一种可能被爱好者自制出的核聚变装置:稠密等离子体焦点
虚粒子233
2年10个月前
发表于
核技术与核仪器
内容:由于各种不稳定性,导致聚焦柱的崩溃,强烈地辐射出各种粒子(电子、离子、X射线和中子)。
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