Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from hogtown.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Tue, 26 Mar 91 11:36:48 -0500 (EST) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Tue, 26 Mar 91 11:36:40 -0500 (EST) Subject: SPACE Digest V13 #299 SPACE Digest Volume 13 : Issue 299 Today's Topics: Space Station 'Fred' Restructuring Re: Value per pound vs. cost per pound Titan IV Launch - March 8, 1991 sci.space Personal Ambition Survey Re: Ulysses Update - 03/15/91 Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription requests, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Date: 13 Mar 91 22:56:00 GMT From: agate!linus!philabs!ttidca!quad1!bohica!mcws!p0.f851.n102.z1.fidonet.org!Dave.McKissock@ucbvax.Berkeley.EDU (Dave McKissock) Subject: Space Station 'Fred' Restructuring From: dbm0000@sei_4.lerc.nasa.gov (Dave McKissock) Path: wciu!elroy.jpl.nasa.gov!ncar!gatech!usenet.ins.cwru.edu!eagle!sei_4.lerc.nasa.gov!dbm0000 Newsgroups: sci.space Subject: Space Station 'Fred' Restructuring Message-ID: <1991Mar13.145613.13459@eagle.lerc.nasa.gov> Date: 13 Mar 91 14:56:13 GMT For anybody interested in "what's happening" with Space Station Freedom Restructuring ... Space Station Freedom Level II recently (2/26/91) issued a Restructuring directive. This directive was issued "to document the Program restsructuring decisions and to ... use the Program restructuring decisions as a basis for updating the Program requirements baseline." The directive identifies the major technical decisions made during the restructuring process using the ISPDR (Integrated Systems Preliminary Design Review) baseline as the reference. A summary of the directive follows (an acronym list is at the end, & believe me, you'll need it!): 1.0 Revised Manifest ======================================================================== 1.1 Revised Assembly Sequence [Text in brackets like this is based on data in the Assembly & Maintenance Implementation Definition Document, Volume 1-Assembly, February 25, 1991] Date Flight Flight Components 11/95 1 FEL MB-1 Truss section with starboard inboard PV system, alpha joint, propulsion module platforms, passive dampers, MT, unpressurized berthing mechanism [Stage MB-1 is unpowered and passively stabilized in a gravity gradient flight mode in a 200 nautical mile orbit. Passive dampers maintain a Torque Equilibrium Attitude and rotation rates within acceptable capture limits for berthing or docking at the beginning of flight 2.] 12/95 2 MB-2 Truss section with CMGs, C&T, 2 propulsion modules (reduced capacity), temporary avionics [The Space Shuttle Orbiter is berthed to the UBM for all assembly operations on this flight. Attitude control authority is maintained by the Orbiter during joined operations. The CMG's are not activiated until flight MB-5. The PV solar arrays and radiators are deployed and activated. The propulsion modules are installed onto the platforms and activation/checkout is performed. However, no jet firings occur during SSF/SS joined operations. Following separation of the Orbiter from the SSF spacecraft, attitude control authority is maintained by the SSF spacecraft in a gravity gradient flight mode. At this time the SSF has attitude control and reboost capabilities.] 3/96 3 MB-3 Truss section with starboard TCS, UHF and KU-band antennas, SSRMS [The TCS and SSRMS are activiated for checkout purposes only. The TCS radiators are not deployed.] 6/96 4 MB-4 Truss section with IUD, MTS, GCP, cryo berthing mechanisms (2), node umbilicals, CETA cart (2), MT Batteries 9/96 5 MB-5 Aft port node, pressurized docking adapter, cupola 12/96 6 MTC MB-6 U.S. lab module core-A, system racks, 7 user payload racks, MBS (ASRMs required) 3/97 7 MB-7 Airlock, pressurized docking adapter, SPDM/MMD 6/97 8 MB-8 Truss section with port TCS, C&T (UHF antenna) 9/97 9 MB-9 Truss section with dry cargo berthing mechanisms(3), 2 propulsion modules (reduced capacity) 12/97 10 MB-10 Truss section with port inboard PV system, alpha joint, propulsion module platforms 3/98 11 MB-11 Aft starboard node, outboard PV spacer 6/98 12 MB-12 JEM module, JEM DDCUs & heat exchanger (ASRMs required) 9/98 13 MB-13 ESA Module, ESA DDCUs & heat exchanger (ASRMs required) 12/98 14 MB-14 Truss section with starboard outboard PV Module 3/99 15 MB-15 JEM exposed facility, JEM ELM PS, JEM ELM ES (ASRMs required) 6/99 16 MB-16 U.S. Hab Module Core-A, system racks (ASRMs required) 9/99 17 PMC MB-17 ACRV (ASRMs required) ======================================================================== 1.2 Revised Utilization Sequence Date Flight Flight Components 5/97 UF-1 8 rack M-PLM, cryo N2/O2 11/97 UF-2 8 rack M-PLM, dry cargo 5/98 UF-3 8 rack M-PLM, hydrazine 11/98 UF-4 8 rack M-PLM, cryo N2/O2, dry cargo 5/99 UF-5 8 rack M-PLM, hydrazine ======================================================================== 2.0 Revised Program Milestones MTC Phase Review October 1991 System Critical Design Review March 1993 Design Certification Review January 1995 Operations Readiness Review June 1995 First Flight Readiness Review September 1995 First Element Launch November 1995 Man-Tended Capability (MB-6) December 1996 Permanently Manned Capability (MB-17) September 1999 ======================================================================== 3.0 Revised Available Payload Volume -15 payload racks available in U.S. Lab at MTC (3 payload racks without N2 or vacuum services) -12 payload racks available in U.S. Lab after PMC -11 payload racks available in JEM/PM -23 payloads racks available in ESA/APM ======================================================================== 4.0 Revised Laboratory A will accommodate (at MTC and PMC): -Maintenance Work Station (1 rack) -Element Control Work Station (1 rack) -Avionics (1 rack) ======================================================================== 5.0 Revised General Configuration Features (MTC) -1 PV Module (including preintegrated truss section outboard of alpha joint) -1 Microgravity Lab (27 ft Module) -1 Node -1 Pressurized Docking Adapter -4 Preintegrated Truss Sections (inboard of alpha joint) -SSRMS/MBS/MT (simplified) -2 Propulsion Modules (downsized) -50 Mbps Ku-band Communications (downlink only) -8 Rack Logistics Carrier -Single-fault tolerant systems for Station survivability (manned & unmanned) ======================================================================== 6.0 Revised General Configuration Features (PMC) -3 PV Modules (including preintegrated truss section outboard of alpha joint) -1 Mictogravity Lab (27 ft Module) -1 Hab Module (27 ft Module) -2 Nodes -Airlock -2 Pressurized Docking Adapters -7 Preintegrated Truss sections (inboard of alpha joint) -NASDA JEM/EF/PLM -ESA APM -ACRV -MSS -4 Propulsions Modules -50 Mbps Ku-band Communications (Downlink only) -8 rack and 20 rack logistics carriers -single-fault tolerant systems for Station survivability plus two-fault tolerant systems for Crew safety including the functional redundancy of the ACRV ======================================================================== 7.0 Follow-on Phase Additional Features (not included in revised budget) -4th PV Module (including preintegrated truss sections outboard of alpha joint) -Hab B with 8 person crew accommodations (27 ft Module) -Lab B (27 ft Module) -2nd ACRV -Node 4 -Node 3 -300 Mbps downlink -2nd Cupola -Closed Loop O2 -Ultra Pure water -Resistojets/Waste Gas Collection -Traffic Management capability ======================================================================== ACRONYM LIST ACRV Assured Crew Return Vehicle, or Astronaut Crew Rescue Vehicle, depending upon which source you use APM Attached Pressurized Module ASRM Advanced Solid Rocket Motor CETA Crew & Equipment Translation Aid CMG Control Moment Gyro C&T Communications & Tracking DDCU dc-to-dc converter unit ELM-ES Experimental Logistics Module Exposed Section ELM-PS Experimental Logistics Module Pressurized Section GCP Gas Conditioning Pallet IUD Integrated Utilities Distribution JEM Japanese Experiment Module M-PLM mini Pressurized Logistics Module MB Manned Base MBS Mobile Base Support (get's attached to the MT) MMD MSC Maintenance Depot MT Mobile Transporter MTC Man Tended Capability MTS Module-to-Truss Support PM Pressurized Module PMC Permanently Manned Capability PV Photovoltaic SPDM Special Purpose Dexterous Manipulator SSRMS Space Station Remote Manipulator System TCS Thermal Control System UBM Unpressurized Berthing Mechanism -- ----------------------------------------------------------------------- Dave McKissock sakissoc@mars.lerc.nasa.gov NASA Lewis Research Center, Cleveland Ohio. Opinions expressed herein probably bear absolutely no resemblance to the official NASA position. -- : Dave McKissock - via FidoNet node 1:102/851 (818)352-2993 : ARPA/INTERNET: Dave.McKissock@p0.f851.n102.z1.fidonet.org : UUCP: ...!{elroy!bohica,elroy!wciu,cit-vax!wciu}!mcws!851.0!Dave.McKissock : Compu$erve: >internet:Dave.McKissock@p0.f851.n102.z1.fidonet.org ------------------------------ Date: 19 Mar 91 22:56:06 GMT From: magnus.acs.ohio-state.edu!zaphod.mps.ohio-state.edu!rpi!news-server.csri.toronto.edu!utzoo!henry@tut.cis.ohio-state.edu (Henry Spencer) Subject: Re: Value per pound vs. cost per pound In article <21355@crg5.UUCP> szabo@crg5.UUCP (Nick Szabo) writes: >[Recommends books on rocket design] > >Sorry, I'm not interested in learning the details of a dead-end technology. Ah, I see. "I've made up my mind, don't confuse me with facts." -- "[Some people] positively *wish* to | Henry Spencer @ U of Toronto Zoology believe ill of the modern world."-R.Peto| henry@zoo.toronto.edu utzoo!henry ------------------------------ Date: 16 Mar 91 23:45:41 GMT From: isis!isis!gaserre@uunet.uu.net (Glenn A. Serre) Subject: Titan IV Launch - March 8, 1991 I haven't seen any mention of the Titan IV launch on the net, but my newsfeed isn't always dependable. According to the Lompoc something-or-other, a Titan IV was launched from VAFB on March 8, 1991. The payload was said by "space analysts" to be a Lacrosse. The launch went great, and all parties appear to be satisfied. Apologies if this was already posted. -- --Glenn Serre gaserre@nyx.cs.du.edu -- --Glenn Serre gaserre@nyx.cs.du.edu ------------------------------ Date: 18 Mar 91 05:47:14 GMT From: rochester!sol!yamauchi@louie.udel.edu (Brian Yamauchi) Subject: sci.space Personal Ambition Survey The following survey was motivated by (1) curiousity about the readership of sci.space combined with (2) the observation that there are many in this newsgroup who seem passionately interested in space exploration but relatively few who are directly involved in the space program. Please e-mail all responses to yamauchi@cs.rochester.edu. All individual responses will be considered confidential, but I will post a summary of the results. ---------- sci.space Personal Ambition Survey 1) As a child, did you want to become an astronaut? 2) Would you still like to travel into space someday? 3) If you were offered a position as a space shuttle astronaut tomorrow, would you take it? 4) What is your current profession/field? (For students: what is your major field of study?) 5) Is your current position directly related to space exploration? (For students: do you plan to work in a position directly related to space exploration?) 6) If the answer to #5 is no, and the answer to #1, #2, or #3 is yes, what made you decide not to get directly involved with space exploration? -- _______________________________________________________________________________ Brian Yamauchi University of Rochester yamauchi@cs.rochester.edu Department of Computer Science _______________________________________________________________________________ ------------------------------ Date: 18 Mar 91 10:44:01 GMT From: mcsun!unido!mpirbn!p515dfi@uunet.uu.net (Daniel Fischer) Subject: Re: Ulysses Update - 03/15/91 In article <1991Mar16.011132.14479@jato.jpl.nasa.gov> baalke@mars.jpl.nasa.gov (Ron Baalke) writes: > ULYSSES STATUS REPORT > March 15, 1991 >[...] Flight operators do not expect the wobble to >return during this phase of the mission because the period of >greatest solar activity has now passed. The next period of solar >activity will occur when the spacecraft is in the region of the >sun's south pole in 1994. What is the physics behind this claim? I thought the wobble was induced by uneven *heating* of the axial boom - and was has 'solar activity' to do with the output of solar heat? The variation of solar luminosity with activity is in the promille range! Also, the statement "the next period of solar activity will occur... in 1994" doesn't make sense as we have had the last solar maximum in 1989 and should expect a decrease of solar activity til around 1995 before it rises again (extrapolating from the last cycle). All this indicates that JPL does mean something different when talking about 'solar activity' than what solar physics use that term for - but what ??? ------------------------------ End of SPACE Digest V13 #299 *******************