- 主题:阿波罗的降落技术遥遥领先，
考虑月面压痕，你提月球轨道上飘着的那坨有什么意义？
【 在 yutong 的大作中提到: 】
: 跟你说话真是费劲，这理解能力真让人无语
: 我说总重量包含月球轨道上那两坨呢，一共8吨多，落月的远没有8吨
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FROM 106.120.220.*
Armstrong, from the 1969 Technical Debrief - "I first noticed that we were, in fact, disturbing the dust on the surface when we were something less than 100 feet; we were beginning to get a transparent sheet of moving dust that obscured visibility a little bit. As we got lower, the visibility continued to decrease. I don't think that the (visual) altitude determination was severely hurt by this blowing dust; but the thing that was confusing to me was that it was hard to pick out what your lateral and downrange velocities were, because you were seeing a lot of moving dust that you had to look through to pick up the stationary rocks and base your translational velocity decisions on that. I found that to be quite difficult. I spent more time trying to arrest translational velocity than I thought would be necessary."
【 在 maga 的大作中提到: 】
: 嗯，阿波罗11号登月舱在离地这么近的地方悬停了3秒以上，降落处地面的浮土还这么厚，一点吹痕不见，它用的一定是磁悬浮技术吧？相比之下，嫦娥6号就不行了，地面一点浮土都没有，阿波罗号果然遥遥领先
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FROM 106.120.220.*
阿波罗11的探测杆长度是1.7米，落月速度1.7ft/s.差不多是0.5m/s，并不快
Landing on the surface occurred at 102:45:39.9 with negligible forward velocity, approximately 2.1 ft/sec to the crew's left, and 1.7 ft/sec vertically. Body rate transients (motions after first footpad touchdown) occurred and indicate that the right and forward landing gear touched almost simultaneously, giving a roll-left and a pitch-up motion to the vehicle. The left-directed lateral velocity resulted in a slight yaw right transient at the point of touchdown. These touchdown conditions, obtained from attitude rates and integration of acceleration data, were verified qualitatively, by the at-rest position of the lunar surface sensing probes and by surface build up around the rims of the footpads ( as photographed by the astronauts during the EVA).
【 在 Zinux 的大作中提到: 】
: 这些都可以通过物理去解释，而不是拍脑袋的觉得越重就得压痕越深。
: 考虑压痕不能只考虑质量的，还有着陆速度、压强、接触角度、月面硬度等。
: 1、嫦娥是采取3米高自由落体，靠支撑结构缓冲。
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FROM 106.120.220.*
月壤厚度可以达到几米甚至几十米，但是月壤层碎石丰度不同，同时的月壤的粒度分布密度孔隙比、强度指标和压缩指数都不一样，甚至白天和夜间的温度变化都会对月壤的黏聚力和摩擦角造成100%及40%的影响。
你用地球上的常温常压泥土环境的生活经验去硬套月壤才是不科学的。
【 在 dnss 的大作中提到: 】
: 等于说宇航员的脚步比几个小圆盘撑着的20多顿重的东西压强大？文盲一样，不会比，不要乱比。你在飞机跑道上打钉子是不是得用锤子用力。
: 一个浮土表面，脚一踩一个脚印的地方，几十吨的东西，你再怎么轻拿轻放，也得压出一个坑。
: 看来这个版真有这么一群人，带着任务来的，明目张胆的侮辱人的智商啊
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FROM 106.120.220.*
看完了，确实是我没认真看，我道歉。
不过这里算静态压强可能也不准，落月垂直速度和姿态也有影响。另外月壤的参数也不一样，没法直观比较。
【 在 yutong 的大作中提到: 】
: 回贴前把上下文都看看知道人家讨论的是啥再回
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FROM 106.120.220.*
你自己没文化不要紧，先去努力把那几个名词概念搞明再给别人扣帽子吧
【 在 dnss 的大作中提到: 】
: 意思就是正好着陆器的几个脚那里是石头，周围宇航员踩的地方是软土呗。
: 这么一看就明白了，明白你们这群人是什么角色了
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FROM 223.104.41.*