垂直升降

maestro · 發表於 2013-7-6 10:24:57

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playerboy · 發表於 2013-7-6 10:40:28

fire of rocket?

henry1328 · 發表於 2013-7-6 11:00:40

SpaceX's Grasshopper

On June 14, SpaceX's Grasshopper flew 325 m (1066 feet)--higher than Manhattan's Chrysler Building--before smoothly landing back on the pad. For the first time in this test, Grasshopper made use of its full navigation sensor suite with the F9-R closed loop control flight algorithms to accomplish a precision landing. Most rockets are equipped with sensors to determine position, but these sensors are generally not accurate enough to accomplish the type of precision landing necessary with Grasshopper.

Previous Grasshopper tests relied on the other rocket sensors but for this test, an additional, higher accuracy sensor was in the control loop. In other words, SpaceX was directly controlling the vehicle based on new sensor readings, adding a new level of accuracy in sensing the distance between Grasshopper and the ground, enabling a more precise landing.

Grasshopper is a 10-story Vertical Takeoff Vertical Landing (VTVL) vehicle designed to test the technologies needed to return a rocket back to Earth intact. While most rockets are designed to burn up on atmosphere reentry, SpaceX rockets are being designed not only to withstand reentry, but also to return to the launch pad for a vertical landing. The Grasshopper VTVL vehicle represents a critical step towards this goal.

Grasshopper consists of a Falcon 9 rocket first stage tank, Merlin 1D engine, four steel and aluminum landing legs with hydraulic dampers, and a steel support structure.
谷歌譯文
在6月14日，SpaceX公司的螞蚱飛到325米（1066英尺） - 高於曼哈頓的克萊斯勒大廈 - 前順利登陸上墊。這是第一次在這個測試中，蟈蟈利用其完整的導航傳感器套件F9-R閉環控制飛行的算法來完成一個精確著陸。大多數火箭都配有傳感器來確定位置，但這些傳感器通常不夠準確完成必要的精確著陸的類型與草蜢。

往前蝗蟲測試依賴於其他的火箭傳感器，但本次測試中，控制迴路中的一個額外的，更高的準確度傳感器。換句話說，SpaceX的直接控制車輛的基礎上新的傳感器讀數，添加一個新的水平精度在傳感蚱蜢和地面之間的距離，從而實現更精確的著陸。

蟈蟈是一個10層的垂直起飛垂直著陸車輛（VTVL）旨在測試返回火箭回地球完好所需要的技術。雖然大多數火箭的設計大氣再入燒起來，SpaceX的火箭被設計不但能夠承受折返，但也返回一個垂直降落到發射台。的蟈蟈VTVL車輛代表實現這一目標的一個關鍵步驟。

草蜢由獵鷹9號火箭第一級坦克，梅林1D引擎，四個鋼和鋁支腿液壓阻尼器，鋼支撐結構。