NASA challenges you to design an attachment system for an ISS habitation experiment.
NASA is seeking to challenge the GrabCAD Community by sponsoring an open competition where participants design an attachment system for an experiment on the International Space Station (ISS). This challenge is in support of NASA’s Logistics Reduction project.
The ISS is a low Earth orbiting research laboratory that is home to six crew members and many experiments. The ISS is also used as a platform to test future spacecraft systems. Although the ISS has standard interfaces to house many types of experiments, some experiments require unique attachment mechanisms.
The overall function of the Experiment Attachment System (EAS) is to attach a future experiment of set volume and mass to seat track interfaces in the ISS. The experiment will be mounted to a plate and the EAS will need to interface with the experiment plate and the seat track. The EAS will need to raise the plate 8.65 inches above the seat track interface.
The main goals of the EAS is to minimize weight and maximize ease of assembly/installation/removal. Astronaut time is valuable and since the EAS will be assembled on-orbit, it is important for the design to be sturdy enough to withstand the loads but also be simple enough (number of connections and parts reduced) to assemble quickly on orbit. It typically takes longer to assemble hardware on orbit than it does on the ground. It’s ok to have multiple parts go into a structural assembly but the intent is to minimize the number of subassemblies assembled on orbit. Hand installation is preferred but tools are acceptable. Assembly should use standard tools that you can find in your garage.
Your entry must include:
• Description of system
• Load calculations
• Assambly procedure
You are encouraged to include: Pro-E files
• Shall be capable of providing a rigid connection to the seat track
• Shall conform to the following sharp edge human factors:
- Exposed edges 0.25 in thick or greater shall be rounded to a minimum radius of 0.12 in.
- Exposed edges 0.12 to 0.25 in thick shall be rounded to a minimum radius of 0.06 in.
- Exposed edges 0.02 to 0.12 in thick shall be rounded to a full radius.
- The edges of thin sheets less than 0.02 in thick shall be rolled or curled.
• Shall have a minimum factor of safety of 1.25 (yield) and 2.0 (ultimate) when exposed to a crew load of 125 lbf applied in any direction as indicated on the attached EAS Envelope drawing
• Shall have a deflection of less than 0.5 inches at the load point when crew load is applied in any direction as indicated on the attached EAS volume drawing
• Reaction load and moment limits for the seat track shall be limited to less than the values defined in Table 1, with coordinate system as shown in Figure 1 for each individual axis. These limits pertain to each attachment point. As a general guideline, you should maximize spacing between seat track attachment points to minimize the interaction between load points. Please see "Download Specifications" for Load & Moment limits
• Shall conform to the installed envelope depicted in the attached EAS Envelope drawing. Please consider tool access needs within the provided envelope.
• Shall conform to a launch envelope of either:
a) 26 inches by 14 inches by 16 inches
b) 17 inches x 14 inches x 16 inches
• Shall weigh less than 20 lbs
• Shall use Aluminum, Stainless Steel, or Acrylonitrile-Butadiene-Styrene (ABS). Note 1: Please refer to ABS mechanical properties listed in the prior NASA challenge.
Note 2: We understand that the materials listed are limiting. However, these are cost efficient materials used by NASA and are well understood. You may choose more exotic materials for smaller parts of the EAS (ex. Titanium pins) but NASA will evaluate how those selections impact cost. Please define your assumptions on material strength in the loads calculation.
• Devices such as self-tapping screws and bolts shall not be used
Judging criteria will be based on achievement of accomplishing criteria listed above, including:
• Pass/Fail – Meet the loads, volume, weight and interface constraints
• Rating – Optimizes assembly and installation simplicity
• Rating – Ease of manufacturability
• Ranking – Minimizes the weight of the structure
ENTERING THE COMPETITION The Challenge is open to everyone except employees and families of GrabCAD and the Sponsor. Multiple entries are welcome. Team entries are welcome. By entering the Challenge you: 1. Accept the official GrabCAD Challenges Terms & Conditions. 2. Agree to be bound by the decisions of the judges (Jury). 3. Warrant that you are eligible to participate. 4. Warrant that the submission is your original work. 5. Warrant, to the best of your knowledge, your work is not, and has not been in production or otherwise previously published or exhibited. 6. Warrant neither the work nor its use infringes the intellectual property rights (whether a patent, utility model, functional design right, aesthetic design right, trademark, copyright or any other intellectual property right) of any other person. 7. Warrant participation shall not constitute employment, assignment or offer of employment or assignment. 8. Are not entitled to any compensation or reimbursement for any costs. 9. Agree the Sponsor and GrabCAD have the right to promote all entries. If you think an entry may infringe on existing copyrighted materials, please email firstname.lastname@example.org
SUBMITTING AN ENTRY
Only entries uploaded to GrabCAD through the "Submit entry" button on this Challenge page will be considered an entry. Only public entries are eligible.
We encourage teams to use GrabCAD Workbench for developing their entries.
Entries are automatically given the tag "NASAEAS" when uploading to GrabCAD. Please do not edit or delete this tag. Only entries with valid tag will participate in the Challenge.
AWARDING THE WINNERS The sum of the Awards is the total gross amount of the reward. The awarded participant is solely liable for the payment of all taxes, duties and other similar measures if imposed on the reward pursuant to the legislation of the country of his/her residence, domicile, citizenship, workplace, or any other criterion of similar nature. Only 1 award per person. All judging decisions are final. All winners will be contacted by the GrabCAD staff to get their contact information and any other information needed to get the prize to them. Payment of cash awards is made through PayPal. All team awards will be transferred to the member who entered the Challenge. We will release the finalists before the announcement of the winners to give the Community an opportunity to share their favorites in the comments, discuss concerns, and allow time for any testing or analysis by the Jury. The Jury will take the feedback into consideration when picking the winners. Winning designs will be chosen based on the Rules and Requirements. - Entry deadline is April 10th, 2016 (11:59pm UTC). - The finalists will be announced by April 28th, 2016. - The winners will be announced by May 5, 2016. Void where prohibited.
SPEC REFINEMENT We want to make sure that you have all of the information that you need to tackle the challenge. As such, in the first week of a challenge we may refine the specifications or offer clarifications based on member feedback. Please ask any questions that you have!
$3,000 in prizes for top 5 places!
The winning designs will be selected with the help of experts from NASA Logistics Reduction and GrabCAD.
The main goal of the Logistics Reduction project is to decrease the dependence on earth resupply for space missions. This is done via direct mass reduction, re-purposing logistics, and conversion of waste into useful by-products (gases, water, solids). We are trying to pack everything for Mars but our suitcase is too full. So we need to be smart about what we take, how we maximize the use of those items, and create new uses for the items once they’ve met their original purpose. Logistics includes crew consumables (food, packaging, clothing, etc), automation of logistics management, and waste management.