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NASA Docking System

NASA Docking System is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand NASA Docking System rather than just read about it. In short: The NASA Docking System is NASA's implementation of the International Docking System Standard (IDSS), an international spacecraft docking standard promulgated by the International Space Station Multilateral Coordination Board. NDS is a spacecraft docking and berthing mechanism used on the International Space Station (ISS), the Boeing Starliner, and the Orion spacecraft.

NASA Docking System — main illustration
NASA Docking System — illustration

Key takeaways

  • NASA Docking System belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect NASA Docking System to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of NASA Docking System from memory before moving on to harder problems.

Reference excerpt

The NASA Docking System is NASA's implementation of the International Docking System Standard (IDSS), an international spacecraft docking standard promulgated by the International Space Station Multilateral Coordination Board. NDS is a spacecraft docking and berthing mechanism used on the International Space Station (ISS), the Boeing Starliner, and the Orion spacecraft. The international Low Impact Docking System (iLIDS) was the precursor to the NDS. NDS Block 1 was designed, built, and tested by the Boeing Company in Huntsville, Alabama. Design qualification testing took place through January 2017. Using NDS, NASA developed the International Docking Adapter (IDA) to provide two IDSS-compliant docking ports on the ISS. The IDAs were delivered to the ISS starting in 2016. Each of two existing Pressurized Mating Adapters has an IDA permanently attached, so the former PMA function is no longer available for visiting spacecraft. Since 2019, visiting spacecraft that implement IDSS dock to the NDS ports on the IDAs. These include Crew Dragon, Cargo Dragon 2, and the Boeing Starliner.

Design NDS supports both autonomous and piloted dockings and includes pyrotechnics for contingency undocking. Once mated the NDS interface can transfer power, data, and air; future implementations will be able to transfer water, fuel, oxidizer and pressurant as well. The passage for crew and cargo transfer has a diameter of 800 millimetres (31 in). In form and function NDS resembles the Shuttle/Soyuz APAS-95 mechanism already in use for the docking ports and pressurized mating adapters on the International Space Station. There is no compatibility with the larger common berthing mechanism used on the US segment of the ISS, the Japanese H-II Transfer Vehicle, the original SpaceX Dragon, and Orbital Sciences' Cygnus spacecraft. NDS is compatible with the IDSS implementation on SpaceX Dragon 2, both Crew Dragon and Cargo Dragon.

History

In 1996, Johnson Space Center (JSC) began development of the Advanced Docking Berthing System, which would later be called the X-38 Low-Impact Docking System. After the X-38 was canceled in 2002, development of the mating system continued, but its future was unknown. In 2004, President George W. Bush announced his Vision for Space Exploration and NASA's 2005 Exploration Systems Architecture Study was created in response, recommended the use of the Low Impact Docking System (LIDS) for the Crew Exploration Vehicle (which was later named Orion) and all applicable future exploration elements. The Hubble Space Telescope received the Soft-Capture Mechanism (SCM) on STS-125. The SCM is meant for unpressurized docking, but uses the LIDS interface to reserve the possibility of an Orion docked mission. The docking ring is mounted on Hubble's aft bulkhead. It may be used for safely de-orbiting Hubble at the end of its service lifetime.

In February 2010, the LIDS program became modified to be compliant with the IDSS and became known as the international Low Impact Docking System (iLIDS) or simply the NASA Docking System (NDS). In May 2011, the NDS critical design review was completed and qualification was expected to be completed by late 2013. In April 2012, NASA funded a study to determine if a less complex docking system could be used as the NASA Docking System that both met the international community's desire for a narrower soft capture system ring width, as well as providing the ISS a simpler active docking system compared to the then-planned design. Boeing's proposal was the Soft Impact Mating and Attenuation Concept (SIMAC), a design originally conceived in 2003 for the Orbital Space Plane (OSP) Program. A leaked NASA internal memo from November 2012, stated that SIMAC had been chosen to replace the previous design and that the majority of the work on the NASA Docking System would be shifted from NASA JSC to Boeing. In August 2014, Boeing announced that the critical design review for the redesigned NDS had been completed. Following this change the IDSS was modified (to rev D), so the new design of the NASA Docking System is still compatible with the standard. IDA-1 was part of the payload on SpaceX CRS-7 in June 2015, but was destroyed when the Falcon 9 rocket exploded during ascent. IDA-2 was delivered successfully on SpaceX's CRS-9 mission in July 2016, and then installed on PMA-2 in August of that year during a spacewalk by Jeffrey Williams and Kathleen Rubins as part of Expedition 48. Crew Dragon Demo-1 was the first spacecraft to dock at this port on 2 March 2019. IDA-3 was launched on the SpaceX CRS-18 mission in July 2019. IDA-3 is constructed mostly from spare parts to speed construction. It was attached and connected to PMA-3 during a spacewalk on 21 August 2019.

References

James L. Lewis, Advanced Docking Berthing System. NASA technical publication. Johnson Space Center. James L. Lewis, Monty B. Carroll. Prototype Low Impact Docking System. NASA technical publication. Johnson Space Center.

External links International Docking System Standard (IDSS) Interface Definitions Document (IDD) Revision D April 2015 International Docking System Standard (IDSS) Interface Definitions Document (IDD) Revision E October 2016 International Docking System Standard (IDSS) Interface Definitions Document (IDD) Revision F July 2022 https://www.internationaldockingstandard.com/

Illustrations

NASA Docking System: NASA Docking System (active androgynous variant on top, permanently passive variant on the bottom).[citation needed] Mechanical latches (visible on the guide petals) in the active ring clamp onto the passive section for contact and capture
NASA Docking System (active androgynous variant on top, permanently passive variant on the bottom).[citation needed] Mechanical latches (visible on the guide petals) in the active ring clamp onto the passive section for contact and capture
NASA Docking System: IDAs shown connected to PMA-2 and PMA-3 on the Harmony node.
IDAs shown connected to PMA-2 and PMA-3 on the Harmony node.
NASA Docking System: Testing of the X-38 Low-Impact Docking System.
Testing of the X-38 Low-Impact Docking System.
NASA Docking System: Interface Seal Concept NDS[3], I. ring pressure seals - assembly, II. concept seal (e.g.Starliner) ― flat surface (e.g.IDA2 on ISS), III. concept seal — seal (similar Apollo–Soyuz)
Interface Seal Concept NDS[3], I. ring pressure seals - assembly, II. concept seal (e.g.Starliner) ― flat surface (e.g.IDA2 on ISS), III. concept seal — seal (similar Apollo–Soyuz)
NASA Docking System: Image showing the design changes from IDSS revision b to c
Image showing the design changes from IDSS revision b to c

Worked examples

Example 1 — a first encounter with NASA Docking System

Start with the simplest possible case. Write down what NASA Docking System claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to NASA Docking System before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about NASA Docking System ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of NASA Docking System

In research
NASA Docking System appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses NASA Docking System in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
NASA Docking System is common in secondary-school and first-year university syllabi. It links to neighbouring topics Spacecraft components, Spacecraft docking systems, so understanding it makes those chapters shorter.
In everyday life
Look for NASA Docking System outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study NASA Docking System in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what NASA Docking System means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain NASA Docking System out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NASA Docking System in simple terms?

The NASA Docking System is NASA's implementation of the International Docking System Standard (IDSS), an international spacecraft docking standard promulgated by the International Space Station Multilateral Coordination Board. NDS is a spacecraft docking and berthing mechanism used on the Internati…

Why does NASA Docking System matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study NASA Docking System?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on NASA Docking System.

Tags

  • Spacecraft components
  • Spacecraft docking systems

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