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Re: GYROSCOPE Design on ISS could endanger Shuttle and Space Station

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  • mysterygravity
    Re: GYROSCOPE Design on ISS could endanger Shuttle and Space Station A few words concerning the ISS Gyro situation. As we know since there have been 2 CMG
    Message 1 of 1 , Nov 10, 2006
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      Re:  GYROSCOPE Design on ISS could endanger Shuttle and Space Station

                    A few words concerning the ISS Gyro situation. As we know since there have been 2 CMG failures since 2000 when the CMGs were placed in operation, that would seem to present a 3 year average for expected failures of this design. I will include some links at the end for further review. However at this point 2 of the CMGs have been in operation for 6 years with partial time of extended wear periods for both of these when one gyro has been offline thereby increasing the wear on those 2 dramatically. One gyro is now on the ground being refurbished but it requires a heavy lift vehicle such as the Shuttle to bring these up. There might be the potential of a new design re-entry pod for  used gyros to be sent back to Earth without the use of the Shuttle, but that would be another project.Regardless the continued use of a limited lifetime design CMG that is not repairable in space does not make sense unless there is a replacement craft for the Shuttle very soon, as the Shuttle is due to be retired very soon. The ISS can continue on Russian thrusters/jets but this will destroy the majority of the microgravity experiments that were intended for the International Space Station. It will also increase the number of potential resupply missions needed to keep the ISS fueled. There might be a possibility, if talk is begun, of a quantity of smaller gyros being brought up by ESA and Russian craft and perhaps other nations could also be brought onboard in this effort. Smaller rockets could bring the smaller gyros up , but they would all need to be synchronized by computer to operate as one to help stabilize/orient/and maintain attitude of the station. As long as control is maintained by Gyro- it doesn't matter how many, but it needs to be enough to maintain attitude/orientation of the mass of the ISS, then the Microgravity experiments can continue. Microgravity experimentation is vital in a large amount of pure science, manufacturing techniques, medications, well the list goes on and on and is a subject all it's own, but was to be a vital part of the advancement expected by humanity from this International Space Station. This goes beyond borders, it really is for all.If the US is unable to come up with all the solutions, then the world community must step forward and begin to offer answers and make offers to help in this situation. We are falling short, but to proceed in a wreckless manner will not solve issues that are not going away without everybody laying their cards on the table.
         I will now include some links to data concerning the situation which all can review at their leisure, but time is short , time to speak up is very rapidly approaching.

      Preliminary Document of CMG as of 1997;
      http://ntrs.nasa.gov/search.jsp?R=164698&id=2&qs=Ntt%3Dcmg%252Biss%252Battitude%26Ntk%3Dall%26Ntx%3Dmode%2520matchall%26N%3D0%26Ns%3DPublicationYear%257c1
      CMG PDF Document 1997 showing initial concept 24pg.;
      http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19970017408_1997026074.pdf
      CMG Manufactured by L3 Communications (NJ) Primary integrator; Boeing;
      http://www.boeing.com/defense-space/space/returntoflight/sts-114/cmg.html
      CMG Image;
      http://sts-114.jaxa.jp/mission/contents/eva/images/083-cmg.jpg
      Laptops as interface and troubleshooter and gyro setup  details;
      http://www.nasa.gov/centers/ames/news/releases/2001/01_51AR.html
      Video page on CMG replacement;
      http://spaceflight.nasa.gov/gallery/video/shuttle/sts-114/html/fd0.html
      News storyof first CMG replacement,BBC;
      http://news.bbc.co.uk/1/hi/sci/tech/4734341.stm
      Illustration of installation of new CMG;
      http://spaceflightnow.com/shuttle/sts114/041219preview/041219cmgreplace.jpg

      Here is a small demonstration model of a CMG that gives a simple example of the vital elements of a CMG and helps to get your mind around the concept, {also a review of the science Gyro post and the demonstration by the astronaut helps for those unfamiliar with gyros} Demonstration Model CMG;
      http://www.ecpsystems.com/controls_ctrlgyro.htm

      Mystery   B-)

       


      --- In antigravity@yahoogroups.com, "mysterygravity" <mysterystevenson1@...> wrote:

         I have been following this problem with the gyros on the International Space Station for the last few weeks and events have been getting worse. At first they played down the problem and went through a series of tests, and while the Gyro in the most trouble is now down, they still will not define it as defunct. Everytime a story is published a different number of minimum gyros is mentioned. Politics do not change PHYSICS ! The Gyros are used to maintain stability and most important attitude, so that the solar panels can track the sun for energy. Without the Gyros the station would use massive amounts of propellant to maintain attitude, and the station would also undergo stresses that it is not designed to maintain for extended periods of time. The reason this is becoming critical is because the last Shuttle just added a large ammount of Mass to the station in the form of solar panels and supplies. The gyroscopic forces needed to maintain attitude is proportional to the ammount of Mass that needs to be controlled or maintained as to attitude. With more mass and fewer gyros the stress put on the remaining gyros increases proportionately. As many will remember we have already had to replace with some difficulty one of these massive Gyros, and the continued failure of these devices, is indicative of a likely design flaw. Bringing more construction (mass) to the station before the gyro problem is addressed is inviting disaster. Here is a link to what is available to the public.
       

        http://www.spaceflightnow.com/shuttle/sts116/061010cmg/
       http://www.spaceflightnow.com/shuttle/sts116/061010cmg/
       

           There is a very likely chance that the failure rate will begin to increase on these Gyro designs. Emergency redundancy Gyros are vital.Too bad these Gyros were not made to be repaired in space, bearings go out-duh, these devices are not even needed to be designed by rocket scientists, although they do need to take into account the environment that the gyros will be used in and the torque and forces that will be experienced. If they have these panels deployed while the mass of the Shuttle is connected to the station and shut down all but one gyro, as it appears may be needed now if they follow through with the construction schedule, then the thrusters may be needed to maintain orientation, but if that is too much force for the assembly to take then it could collapse right onto the Shuttle, and if that happens, more than a piece of foam will be effected. I don't want to say what could happen! We are talking astronauts on the Shuttle and the Station, and the Shuttle and the Station themselves.
       
      TIME TO THINK ...
       
      MYSTERY   B-)

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