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  • Hey it's me Destin. Welcome back to Smarter Every Day. So last week I

    嘿,這是我Destin。歡迎回到 "每天更聰明"。所以上週我

  • described collective pitch control for a helicopter, I described cyclic pitch

    我描述了直升機的集體俯仰控制,我描述了週期性俯仰控制。

  • control for a helicoper, and I also described anti-torque pitch contol

    直升機的控制,我還描述了反扭矩俯仰控制,我還描述了反扭矩俯仰控制。

  • But this week we're going to combine them all and describe something called collective-cyclic pitch mixing.

    但本週我們'要把它們都結合起來,並描述一種叫做集體循環音調混合的東西。

  • It's pretty cool, and it's basically how every helicopter pilot flies,

    它'很酷,基本上每個直升機飛行員都是這麼飛的。

  • including Carl in this case. The way I'm gonna describe this to you is by setting up

    包括卡爾在這種情況下。我向你描述的方式是通過設置。

  • and showing you a high speed video clip of Carl flipping the helicopter over and flying inverted.

    並給你看一段卡爾將直升機翻轉倒飛的高速視頻。

  • [rotor noise] You're about centre of the frame, maybe a little less right there.

    你大概在車架的中心位置,也許就在那裡少一點。

  • [rotor noise]

    [轉子噪音]

  • [rotor noise] That's gonna be good.

    這將是不錯的。

  • It's pretty interesting, because if you think about it he's having

    這是很有趣的,因為如果你想想看,他的有。

  • to use both collective and cyclic to make the sweep, go up, and then he's

    使用集體和循環使掃,上去,然後他'的。

  • going back to negative collective.

    回到消極的集體。

  • [music]

    [音樂]

  • And then he's balancing

    然後他在平衡

  • it up there with cyclic all the time. So you can see he's never using

    它在那裡與循環所有的時間。所以你可以看到他從來沒有用過

  • one particular input. It's always a variation of both. OK so if you

    一個特定的輸入。它'總是兩者的變化。好的,所以如果你

  • didn't really understand what was going on there, I asked Carl to do something else for us.

    並沒有真正理解那裡發生的事情,我讓卡爾為我們做一些別的事情。

  • I asked him to mount a camera on the back of his helicopter looking at the swashplate, and then

    我讓他在直升機後面裝一個攝像頭,看著斜盤,然後... ...

  • take a normal flight so you could see the collective-cyclic mixing, but here's a couple of things to

    採取正常的飛行,所以你可以看到 集體循環混合,但這裡'是一對夫婦的事情,以

  • keep in mind. At the top of the screen you're going to see the rotors, and at some point it's gonna look like

    牢記。在螢幕的頂部,你會看到轉子,並在某些時候,它'的會看起來像

  • the rotors are bending. That's actually not happening. What you're seeing there is

    轉子是彎曲的。這實際上沒有發生。你所看到的是

  • something called the rolling shutter effect. The second thing you're gonna see it looks like the

    稱為滾動快門效應的東西。第二件事,你'會看到它看起來像

  • rotor shaft is speeding up and slowing down wildly. That has to do with the frame rate of the camera.

    轉子軸瘋狂加速和減速。這與相機的幀率有關。

  • That's called aliasing. If you want to know what aliasing is, just click this box over

    這就叫別名。如果你想知道什麼是別名,只需點擊上方的這個框。

  • here and I'll explain that to you in greater detail.

    在這裡,我'會給你更詳細的解釋。

  • [electronic servo sounds]

    [電子伺服聲]

  • [music]

    [音樂]

  • [music]

    [音樂]

  • OK I've been getting a lot of comments on these videos about whether or not an actual

    好吧,我'已經得到了很多的評論,這些視頻是否實際的。

  • helicopter can do these types of manouvres. And the answer is yes, and no.

    直升機可以做這些類型的動作。 答案是可以,也可以不可以。

  • Helicopters can do this if they're designed for it, however you're limited by

    直升機可以做到這一點,如果他們'的設計,然而你'的限制,由

  • the meat servo sitting in the seat. A human can only take so much accelleration.

    坐在座位上的肉類伺服。一個人只能承受這麼多的加速度。

  • So how do you scale up what you're seeing on this RC helicopter to a real

    那麼,如何將你在遙控直升機上看到的東西放大到真正的直升機上呢?

  • helicopter? Before they flew a space shuttle into space they had to do a wind tunnel test

    直升機?在他們駕駛航天飛機進入太空之前,他們必須做一個風洞測試。

  • on it somehow right? Well it gets complicated but there's a term called similitude

    某種程度上是吧?好吧,它變得複雜,但有一個術語,稱為比喻。

  • and similitude has to do with the geometric

    和比喻與幾何學有關。

  • kinematic and the dynamic similarity between a small scale object and a

    運動學和動態學上的相似性,小尺度的物體和小尺度的物體之間的相似性

  • full scale object. Engineers do this all the time, especially aerospace engineers.

    全比例物體。工程師經常這樣做,尤其是航空航天工程師。

  • So anyway, go look at the wiki link I'm gonna put below and read up on similitude

    所以,無論如何,去看看我'要把下面的維基鏈接,並閱讀了對比喻

  • so you can understand it. I will tell you this. It has something to do with continuum mechanics

    所以你可以理解它。我會告訴你這個。它與連續體力學有關。

  • which is by far the hardest course I've ever taken in my life. So if you must know

    這是到目前為止我一生中最難的課程''ve採取。所以如果你一定要知道

  • there's a city in Florida named Destin, and the thrift store there is the coolest place

    有一個城市在佛羅里達州命名為Destin, 和舊貨店那裡是最酷的地方

  • on earth for me personally. Anyway next week's video will blow your mind.

    在地球上對我個人來說。總之下週'的視頻會讓你大吃一驚。

  • It's really complicated but it's really interesting, so

    這真的很複雜,但它真的很有趣,所以。

  • if you can understand it you're doing pretty good, but it blew my mind.

    如果你能理解它,你'做得很好,但它讓我大吃一驚。

  • It's gonna blow yours too. Have a good one, and get Smarter Every Day.

    它'的會吹你的太。 有一個好的,並得到更聰明的每一天。

  • [ Captions by Andrew Jackson ]

    [安德魯-傑克遜的字幕]

  • Captioning in different languages welcome. Please contact Destin if you can help.

    歡迎使用不同語言的字幕。如果你能幫忙,請聯繫Destin。

Hey it's me Destin. Welcome back to Smarter Every Day. So last week I

嘿,這是我Destin。歡迎回到 "每天更聰明"。所以上週我

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