The receptivity to freestream acoustic disturbances and the stability properties of hypersonic boundary layers are numerically investigated for boundary-layer flows over a 5 straight cone at a freestream Mach number of 6.0. To compute the shock and the interaction of the shock with the instability waves, the Navier-Stokes equations in axisymmetric coordinates were solved. In the governing equations, inviscid and viscous flux vectors are discretized using a fifth-order accurate...
Topics: NASA Technical Reports Server (NTRS), BOUNDARY LAYER STABILITY, FREQUENCY STABILITY, BOUNDARY LAYER...
A document discusses a multi-Gigabit-per-second, Ka-band transceiver with a software-defined modem (SDM) capable of digitally encoding/decoding data and compensating for linear and nonlinear distortions in the end-to-end system, including the traveling-wave tube amplifier (TWTA). This innovation can increase data rates of space-to-ground communication links, and has potential application to NASA s future spacebased Earth observation system. The SDM incorporates an extended version of the...
Topics: NASA Technical Reports Server (NTRS), BIT ERROR RATE, COMMUNICATION NETWORKS, DECODERS, END-TO-END...
The objective of this study is to examine the effect of flight, at off-design conditions, on the propagated sonic boom pressure signatures of a small "low-boom" supersonic aircraft. The amplification, or focusing, of the low magnitude "shaped" signatures produced by maneuvers such as the accelerations from transonic to supersonic speeds, climbs, turns, pull-up and pushovers is the concern. To analyze these effects, new and/or improved theoretical tools have been developed,...
Topics: NASA Technical Reports Server (NTRS), SONIC BOOMS, WAVEFORMS, SUPERSONIC AIRCRAFT, SUPERSONIC...
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Jan 14, 2009
01/09
Jan 14, 2009
by
Travus T. Hipp - Cabale News Service
audio
eye 152
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In The News: George W. Bush is on his way out the door and headin' towards the ranch. Everyone even vaguely related to his administration is on the interview circuit trying to explain what they meant. ...including Osama bin Laden. A new communique surfaces. He calls for war in Gaza sooner than later and points out that in the 'Dead or Alive' equation, he's still alive, and Obama has a problem. Details. What to do about Gitmo and it's 'detainees' is still the 'hot button topic', and it's notable...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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Dec 1, 2008
12/08
Dec 1, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 217
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In The News: The Obama administration National Security team is named. Details. The one surviving terrorist from the Mumbai India attacks is from an organization named Lashkar-e-Toiba, connected to Pakistan's ISI (which makes them vaguely connected to the West, and the CIA)... More details, and MUCH MORE at wikipedia . Many of its objectives are inspired by the Inter Services Intelligence (ISI) of Pakistan. With the American presence and military pressure in Afghanistan, the ISI lost its...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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Nov 19, 2008
11/08
Nov 19, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 154
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In The News: Thanks to another KPIG listener, Christopher M., for the commentary rip. Pitchforks and Torches - Dick Cheney and Alberto Gonzales have been indicted for abuse of prisoners at private prison facilities in Texas. They had financial interests in the facilities and were also in a position to make policy allowing the prisoner abuse. Ayman al-Zawahiri the operational CEO of al Qaeda, has a new tape out. He refers to president-elect Obama as a "House N...". More. The Iraqi...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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140
Nov 18, 2008
11/08
Nov 18, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 140
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In The News: It's like the opening of the deer season in congress. Congress is back in session and the economic bailout is under investigation. High level financial hacks like Fed Chairman Bernake and Treasury Secretary Paulson are being grilled about how a mortgage bailout became a government ==>> bank recapitalization/investment program. Convicted criminal Rethuglican senator Ted Stevens and turncoat Demoncrat Senator Joe Lieberman are gonna get some 'treatment' from their respective...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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202
Nov 17, 2008
11/08
Nov 17, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 202
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In The News: Iraq is ready to boil over - The al Maliki government votes for a Status of Forces Agreement using the 'Sovereignty Portfolio' ministers Al-Hayat reports in Arabic that an unnamed high official in Iraq said that he expected the cabinet to pass the agreement on Sunday or Monday, since it was supported by the ministers with "sovereignty portfolios" (Defense, Interior, Foreign Affairs, and Finance) More @ Juan Cole's Informed Comment (read Some ministers are " Capo di...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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108
Nov 14, 2008
11/08
Nov 14, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 108
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In The News: Barack Obama is picking his staff, and journalist Andrea Mitchell is claiming they are considering Hillary Clinton for Secretary of State. That would also change the senatorial equation. More. Muqtada al Sadr has said his Mahdi army will be resuming attacks on Iraqi police, military and government agencies if the US is still in Iraq when our 'hunting license' expires on January 01 2009. Will there be a special session of the UN to extend our presence? 4195 Americans have died in...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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106
Nov 10, 2008
11/08
Nov 10, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 106
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In The News: The US is criticizing Syria about Iraq border infiltration as fighting intensifies on the Iraq/Syria border. Syria responds in kind with a few un-kind words. Fighting also continues on the Georgia/South Ossetia border, where the pipelines are China, still recovering from flooding last week experiences a 6.5 earthquake. In their financial realm, due to global finance problems affecting manufacturing (and their possession of a huge amount of increasingly worthless US treasuries)...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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123
Oct 20, 2008
10/08
Oct 20, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 123
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In The News: The final draft of the Status of Forces Agreement with Iraq has been protested by tens of thousands of Iraqis in the streets at Muqtada al-Sadr's request and the Iraqi parliament has a laundry list of things they want from the deal.... This ALL has to happen by the 31st of December or we officially become invaders. The Obama campaign is asking the DOJ to have the special prosecutor assigned to the investigation of ACORN include Republican-related voter fraud as well... See below....
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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227
Sep 9, 2008
09/08
Sep 9, 2008
by
Travus T. Hipp - Cabale News Service
audio
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In The News: A British anti-terrorist court case on 8 men, including massive amounts of surveillance videos, for a supposed airline bombing plot, ends with only 3 convicted of "conspiracy to murder" with a hydrogen peroxide bomb... not the airline terrorist plot the prosecutor and government spoke of. Sitrep from the Independent UK . President Bush is on the air right now explaining how he's going to keep troops in Iraq even after he leaves office. Details on a piecemeal, confused...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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180
Sep 8, 2008
09/08
Sep 8, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 180
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In The News: Repeating history - Venezuela and Russia have just announced joint naval fleet exercises in the Caribbean this fall. It's also notable the The 6th fleet of the US navy is anchored off the port of Poti Georgia, just a couple of hundred yards from Russian occupation forces. More on THAT from Friday's news and commentary : From John Paul Jones To The Present - A Fleet-ing Confrontation Between The US And Russian Navies Is Brewing In The Black Sea America is now officially in a state...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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177
Sep 5, 2008
09/08
Sep 5, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 177
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In The News: Can't you hear the sabers rattle? A naval battle involving the US and Russia is brewing in the Black Sea. The flagship of the 6th fleet, a state-of-the-art missile cruiser docks at Poti Georgia with the rest of the fleet nearby. The president of Russia recently asked (paraphrased) "Why is your humanitarian aid being delivered by fully equipped warships with NATO detachments on board? ...and '..we will answer this challenge'. From AFP: Russia angry at US ship, Cheney sees...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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134
Aug 21, 2008
08/08
Aug 21, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 134
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In The News: Endgame in Iraq - Condi Rice flies into Baghdad town in what is most likely a final attempt to get a signature on a Status Of Forces Agreement, without which, the US can no longer continue to operate in the country without assuming criminal liability, and no doubt it's been criminal all along, but the Bush administration wouldn't care to make that illegal status official... Or would they?. Also, there's been no signature on another document defining the reason we're there in the...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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97
Aug 6, 2008
08/08
Aug 6, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 97
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In The News: Reality check for the Pentagon - Yemeni national Salim Hamdan, 'Osama's driver', receives his Guantanamo military tribunal sentence. He was sentenced to 6 years... Light to start with. The kicker... He's already done all but 6 months. The US government says they don't have to let him go if they don't want to [ Ex-State Department's Bill Fisher on that ]. More. An Analysis of the decision from Timesonline (UK) . The president of Iraq asks the US to get all of our troops out by 2010...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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319
Jul 10, 2008
07/08
Jul 10, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 319
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In The News: The art of politics is "Compromise Solution". The shiny new FISA bill appears to protect American citizens from phone company spying... If the government and the phone company obey laws they didn't obey the last time. Hillary Clinton voted against it because of the retroactive immunity. Barack Obama and John McCain were MIA. Details. In other senate voting, the 10% cut in MediCare payments to doctors is surgically removed, and the recovering-from-brain-surgery Ted Kennedy...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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223
Jun 30, 2008
06/08
Jun 30, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 223
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In The News: There is a rift in U.S. war policy making circles over whether to invade Waziristan and the Autonomous tribal region of Pakistan over the possibility that we actually know where Osama bin-Laden is. However WE ARE putting SOG covert operatives into Iran to militarily target their nuclear research facilities and other infrastructure according to Seymour Hersh at the New Yorker . Dennis Kucinich on the 'Fallout' from a potential attack on Iran's nuclear research facilities... Below...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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291
May 19, 2008
05/08
May 19, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 291
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In The News: News travels fast in the information age. No sooner than President Bush leaves the meeting with Middle East leaders at Sharm el-Sheikh, before he's even in the air, Osama bin Laden issues a statement accusing the attendees of abandoning the Palestinians. Teddy Kennedy is hospitalized by a possible stroke and is stable and coherent at a medical facility in Boston. There was a 6.8 aftershock at the epicenter of the Sichuan China earthquake. There are 34,000 dead so far, and questions...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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547
Feb 19, 2008
02/08
Feb 19, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 547
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In The News: Fidel Castro steps down as president of Cuba. The Cuban parliament (Yes, Cuba has a parliament, but you wouldn't know that by perusing the US media), already in session, may decide on a new leader of Cuba in the next week or so. Sitrep. Pakistan's parliamentary election shows a large turnout and the opposition parties seem set to take what governmental powers still exist. Where IS the beef? 143 MILLION pounds of contaminated beef from one meat packer in Chino California. The recall...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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173
Jan 29, 2008
01/08
Jan 29, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 173
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In The News: It's primary Election day in Florida and there are already screw ups with the electronic voting machines. Florida Democratic voters don't count for much anyway. Details. The president is asking $70 BILLION more in supplemental spending for our occupations of Iraq & Afghanistan. The Senate finance committee is looking for a fight with the White House over the economic stimulus package. They want inclusion of seniors, the unemployed, and USDA food stamps in the package. More. The...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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331
Jan 23, 2008
01/08
Jan 23, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 331
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In The News: Jose Padilla - A federal judge sentences him to 17 years, NOT LIFE as requested by the prosecution, and further, required vocational training for him in prison, which means he WILL NOT be kept in a SuperMax lockdown, comments that there WAS NO LINK between Padilla and any terrorist act. An appeal is possible and hopefully likely. More.... Arnold Schwarzenegger is attempting to drive a wedge into the federal boycott of Cuba by sending an agricultural trade delegation. You go Arnold!...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
246
246
Jan 18, 2008
01/08
Jan 18, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 246
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In The News: Taking a taser, or the 'electro-shock paddles' to the American economy - Can the U.S. government get it together with an economic stimulus plan? Canada signs onto a resolution essentially saying the U.S. practices torture, and their diplomatic/legal channels are to be used to assist people such as one of their citizens who claimed to be held without charges and tortured by the U.S. More from Jurist World Legal News The US Army surgeon general says 20% of all returning...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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317
Jan 7, 2008
01/08
Jan 7, 2008
by
Travus T. Hipp - Cabale News Service
audio
eye 317
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In The News: It's getting scary in the Persian Gulf - The seafaring wing of the Iranian Revolutionary Guard challenges the U.S. Navy in the Strait of Hormuz. The burning question? What gives the west an exclusive right to patrol the Strait. The NY Times publishes a story which claims the Bush administration is giving U.S. Special Forces a 'Hunting License' in Waziristan and the Autonomous Tribal Area. { The Washington Post blogger William Arkin had already reported this , but it's good to see...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
280
280
Dec 17, 2007
12/07
Dec 17, 2007
by
Travus T. Hipp - Cabale News Service
audio
eye 280
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In The News: There are glowing reports from the Pentagon on how well the war is going in Iraq (because we aren't getting our soldiers killed.) Turkey attacks over the border in Iraqi Kurdish territory with U.S. military knowledge. Bombardment and helicopter gunships... No casualty count yet. Al Qaeda's al Zawahiri is calling on the people of Iraq to rise up against their government & anyone who cooperates with it... denounces Iran/Syria. The US agrees to negotiate on the terms of a climate...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
690
690
Dec 11, 2007
12/07
Dec 11, 2007
by
Travus T. Hipp - Cabale News Service
audio
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In The News: Scooter Libby drops his appeal for a conviction on obstruction of justice... and just in time for the '08 elections. More. The former Yugoslavia is being further divided up and Kosovo is next for 'independence'. Details. More on Kosovo detailing NATO's employment of Osama bin-Laden's Kosovo Liberation Army, and how the same group of international mercenary organizations ARE STILL working for the West in the Middle East BushWars Inc. - We Finance Weapons For EVERYONE! No Money...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
291
291
Dec 5, 2007
12/07
Dec 5, 2007
by
Travus T Hipp - Cabale News Service
audio
eye 291
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In The News: In the supreme court... Guantanamo... Habeas Corpus... Whether the detainees, all 300 or so, even have the right to appear in a federal court. Details Peru - A free trade agreement with the U.S. passes. One of the few Latin-American-U.S. diplomatic victories in a while. Estonia has voted to extend their troop deployment in Afghanistan... President Putin of Russia meets with the 'nuclear technology negotiator' from Iran to discuss IAEA oversight. Defense Secretary Gates drops into...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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106
Nov 30, 2007
11/07
Nov 30, 2007
by
Travus T Hipp - Cabale News Service
audio
eye 106
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In The News: Breaking! The Democrats grow a backbone for Thanksgiving. The Democrats are picking fights with the Bush administration... Patrick Leahy of the Judiciary committee say the he will send the Capitol police to get the White House administrative aides if they don't comply immediately with subpoenas issued... Joe Biden says '...start a war with Iran and impeachment proceedings will start immediately.' The Democratic National Committee meeting begins today to discuss strategy for the '08...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
221
221
Nov 29, 2007
11/07
Nov 29, 2007
by
Travus T Hipp - Cabale News Service
audio
eye 221
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In The News: Reality Check - Nothing is ever safe. Hungary arrests 2 people from Slovakia trying to sell 2 pounds of nuclear material. The Pentagon cuts ALL PROGRAMS that do not directly support 'our troops' in Iraq due to the hung-in-congress Iraq-Afghanistan funding bill. Details. An Midwest oil pipeline from Canada to the U.S. explodes... More from Global Guerrillas: Thursday, 29 November 2007 JOURNAL: A Demonstration US of Network Vulnerability An explosion and consequent fire shut down...
Topics: Travus T. Hipp, Cabale News Service, KPIG, Politics, News, Alternative News, U.S. Foreign Policy,...
Source: KPIG Radio Freedom California
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236
Oct 23, 2007
10/07
Oct 23, 2007
by
Travus T. Hipp - Cabale News Service
audio
eye 236
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In The News: The price of freedom... $200 BILLION DOLLARS for the fiscal year. George Bush wants an additional $46 billion for Iraq & Afghanistan with NO restrictions, riders, earmarks. That's on top of another $142 billion plus loose change already in the works ... Iraq: al-Sistani's aides plus members of the al-Badr group fly in to al-Anbar for a meeting on an American military helicopter. The U.S. is trying to secure their cooperation with each other... Osama bin Laden releases a tape...
Topics: Travus T. Hipp Morning News & Commentary, Cabale News Service, Travus T. Hipp, KPIG, News,...
Source: KPIG Radio Freedom California
Three shapes of tensile specimens were tested--curved with a very low stress concentration factor and straight with either a circular hole or an elliptical hole. The nominal thickness was 125 micron with a net section 100 micron wide; the overall length of these microspecimens was 3.1 mm. They were fabricated by an improved version of deep reactive ion etching, which produced specimens with smooth sidewalls and cross-sections having a slightly trapezoidal shape that was exaggerated inside the...
Topics: NASA Technical Reports Server (NTRS), CERAMICS, SILICON CARBIDES, HOLES (MECHANICS), STRESS...
528
528
Sep 20, 2007
09/07
Sep 20, 2007
by
Travus T. Hipp - Cabale News Service
audio
eye 528
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In The News: The senate votes not to allow U.S. military personnel to rest for 12 months between deployments to combat in Iraq & Afghanistan. Currently the troops spend 15 months under fire. Details. Osama bin-Laden calls for jihad against Pakistan's Musharraf government. Pakistan is already on the way to becoming a failed semi-autocratic government... actually, less than 'semi', but that's another story. Iran's president Ahmadinejad asks for permission and a security detail to visit the...
Topics: Travus T. Hipp Morning News & Commentary, Cabale News Service, Travus T. Hipp, KPIG, News,...
Source: KPIG Radio Freedom California
317
317
Sep 11, 2007
09/07
Sep 11, 2007
by
Travus T. Hipp - Cabale News Service
audio
eye 317
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In The News: It's 9/11, a reminder that we weren't paying attention. We still aren't, at least not to the root causes of why some people might hate us enough to drive airplanes into our buildings . Keep telling yourself they are jealous of our way of life and resigning yourself to living in a police state is the only other option currently available. Ambassador Crocker & general Petraeus will go before a Senate committee today... Maybe the general will be sworn in this time: House Democrats...
Topics: Travus T. Hipp Morning News & Commentary, Cabale News Service, Travus T. Hipp, KPIG, News,...
Source: KPIG Radio Freedom California
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247
Sep 10, 2007
09/07
Sep 10, 2007
by
Travus T. Hipp - Cabale News Service
audio
eye 247
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strong>In The News: September Song... The Iraq Opera: Congressional hearings on the White House/Crocker/Petraeus (in order of input prioritization) report begins shortly. The report is supposed to be definitive... definitive of what, we'll have to see when the pundits do the post-game analysis , but McClatchy broke huddle first: War testimony, while seminal, is unlikely to alter course By Nancy A. Youssef | McClatchy Newspapers Not since Gen. Creighton Abrams, who replaced Gen. William...
Topics: Travus T. Hipp Morning News & Commentary, Cabale News Service, Travus T. Hipp, KPIG, News,...
Source: KPIG Radio Freedom California
278
278
Sep 7, 2007
09/07
Sep 7, 2007
by
Travus T. Hipp - Cabale News Service
audio
eye 278
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In The News: Keeping the context: Australia is famous for practical jokes, and the APEC (A Pointless Expensive Crock) meeting gets a visit from 'Osama bin-Laden', who made it to within yards of the hotel the dignitaries are staying at. Speaking of 'jokes', arriving at the airport in Sydney (at least one White House press release referred to it as 'Sidney'...), President Bush ran up to the Australian Deputy Prime Minister and exclaimed "Hey! We're kickin' ass in Iraq!". Video of...
Topics: Travus T. Hipp Morning News & Commentary, Cabale News Service, Travus T. Hipp, KPIG, News,...
Source: KPIG Radio Freedom California
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260
May 23, 2007
05/07
May 23, 2007
by
Travus T. Hipp - Cabale News Service
audio
eye 260
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In The News: Al Qaeda & Iraq are the same war according to the president, but others claim that the White House is STILL selectively releasing intel (cherrypicking) to bolster it's case for destroying Iraq without being declared international war criminals. 4000 soldiers are looking for 2 missing troopers now. One POW has been tentatively identified after being pulled from the Euphrates river with 2 gunshot wounds. The Gonzales 'no-confidence' vote to be held after congress recesses,...
Topics: Travus T. Hipp Morning News & Commentary, Cabale News Service, Travus T. Hipp, News,...
Source: KPIG Radio Freedom California
Studies have shown that significant vehicle mass and cost savings are possible with the use of ballutes for aero-capture. Through NASA's In-Space Propulsion program, a preliminary examination of ballute sensitivity to geometry and Reynolds number was conducted, and a single-pass coupling between an aero code and a finite element solver was used to assess the static aeroelastic effects. There remain, however, a variety of open questions regarding the dynamic aeroelastic stability of membrane...
Topics: NASA Technical Reports Server (NTRS), AEROELASTICITY, MEMBRANE STRUCTURES, FLEXIBILITY, BALLUTES,...
A methodology has been devised for accounting for uncertainties in the strengths of silicon carbide structural components of microelectromechanical systems (MEMS). The methodology enables prediction of the probabilistic strengths of complexly shaped MEMS parts using data from tests of simple specimens. This methodology is intended to serve as a part of a rational basis for designing SiC MEMS, supplementing methodologies that have been borrowed from the art of designing macroscopic brittle...
Topics: NASA Technical Reports Server (NTRS), MICROELECTROMECHANICAL SYSTEMS, SILICON CARBIDES,...
ANSYS/CARES/PDS is a software system that combines the ANSYS Probabilistic Design System (PDS) software with a modified version of the Ceramics Analysis and Reliability Evaluation of Structures Life (CARES/Life) Version 6.0 software. [A prior version of CARES/Life was reported in Program for Evaluation of Reliability of Ceramic Parts (LEW-16018), NASA Tech Briefs, Vol. 20, No. 3 (March 1996), page 28.] CARES/Life models effects of stochastic strength, slow crack growth, and stress distribution...
Topics: NASA Technical Reports Server (NTRS), CERAMICS, LIFE (DURABILITY), PROBABILITY THEORY, RELIABILITY,...
Single crystal silicon carbide micro-sized tensile specimens were fabricated with deep reactive ion etching (DRIE) in order to investigate the effect of stress concentration on the room-temperature fracture strength. The fracture strength was defined as the level of stress at the highest stressed location in the structure at the instant of specimen rupture. Specimens with an elliptical hole, a circular hole, and without a hole (and hence with no stress concentration) were made. The average...
Topics: NASA Technical Reports Server (NTRS), FRACTURE MECHANICS, FRACTURE STRENGTH, SINGLE CRYSTALS,...
An analytical methodology is developed to predict the probability of survival (reliability) of ceramic components subjected to harsh thermomechanical loads that can vary with time (transient reliability analysis). This capability enables more accurate prediction of ceramic component integrity against fracture in situations such as turbine startup and shutdown, operational vibrations, atmospheric reentry, or other rapid heating or cooling situations (thermal shock). The transient reliability...
Topics: NASA Technical Reports Server (NTRS), RELIABILITY ANALYSIS, WEIBULL DENSITY FUNCTIONS, PROBABILITY...
A methodology is shown for predicting the time-dependent reliability of ceramic components against catastrophic rupture when subjected to transient thermomechanical loads (including cyclic loads). The methodology takes into account the changes in material response that can occur with temperature or time (i.e., changing fatigue and Weibull parameters with temperature or time). This capability has been added to the NASA CARES/Life (Ceramic Analysis and Reliability Evaluation of Structures/Life)...
Topics: NASA Technical Reports Server (NTRS), MECHANICAL PROPERTIES, CERAMICS, TIME DEPENDENCE, TRANSIENT...
Present capabilities of the NASA CARES/Life (Ceramic Analysis and Reliability Evaluation of Structures/Life) code include probabilistic life prediction of ceramic components subjected to fast fracture, slow crack growth (stress corrosion), and cyclic fatigue failure modes. Currently, this code has the capability to compute the time-dependent reliability of ceramic structures subjected to simple time-dependent loading. For example, in slow crack growth (SCG) type failure conditions CARES/Life...
Topics: NASA Technical Reports Server (NTRS), CERAMICS, CRACK PROPAGATION, FATIGUE LIFE, LIFE (DURABILITY),...
An implicit method for the computation of unsteady flows on unstructured grids is presented. The resulting nonlinear system of equations is solved at each time step using an agglomeration multigrid procedure. The method allows for arbitrarily large time steps and is efficient in terms of computational effort and storage. Validation of the code using a one-equation turbulence model is performed for the well-known case of flow over a cylinder. A Detached Eddy Simulation model is also implemented...
Topics: NASA Technical Reports Server (NTRS), TURBULENCE MODELS, SEPARATED FLOW, UNSTEADY FLOW,...
High temperature and long duration applications of monolithic ceramics can place their failure mode in the creep rupture regime. A previous model advanced by the authors described a methodology by which the creep rupture life of a loaded component can be predicted. That model was based on the life fraction damage accumulation rule in association with the modified Monkman-Grant creep ripture criterion However, that model did not take into account the deteriorating state of the material due to...
Topics: NASA Technical Reports Server (NTRS), CREEP ANALYSIS, CREEP PROPERTIES, CERAMICS, CAVITATION FLOW,...
Over the past few years, the development of the interface technology has provided an analysis framework for embedding detailed finite element models within finite element models which are less refined. This development has enabled the use of cascading substructure domains without the constraint of coincident nodes along substructure boundaries. The approach used for the interface element is based on an alternate variational principle often used in deriving hybrid finite elements. The resulting...
Topics: NASA Technical Reports Server (NTRS), FINITE ELEMENT METHOD, NONLINEARITY, THREE DIMENSIONAL...
High temperature and long duration applications of monolithic ceramics can place their failure mode in the creep rupture regime. A previous model advanced by the authors described a methodology by which the creep rupture life of a loaded component can be predicted. That model was based on the life fraction damage accumulation rule in association with the modified Monkman-Grant creep rupture criterion. However, that model did not take into account the deteriorating state of the material due to...
Topics: NASA Technical Reports Server (NTRS), CREEP ANALYSIS, REGRESSION ANALYSIS, PREDICTION ANALYSIS...
The work presented in this paper include: 'Coupled and Uncoupled Bending-Torsion Responses of Twin-Tail Buffet'; 'Fluid/Structure Twin Tail Buffet Response Over a Wide Range of Angles of Attack'; 'Resent Advances in Multidisciplinary Aeronautical Problems of Fluids/Structures/Dynamics Interaction'; and'Development of a Coupled Fluid/Structure Aeroelastic Solver with Applications to Vortex Breakdown induced Twin Tail Buffeting.
Topics: NASA Technical Reports Server (NTRS), AEROELASTICITY, ANGLE OF ATTACK, VORTEX BREAKDOWN, AEROSPACE...
The desirable properties of ceramics at high temperatures have generated interest in their use for structural applications such as in advanced turbine systems. Design lives for such systems can exceed 10,000 hours. Such long life requirements necessitate subjecting the components to relatively low stresses. The combination of high temperatures and low stresses typically places failure for monolithic ceramics in the creep regime. The objective of this work is to present a design methodology for...
Topics: NASA Technical Reports Server (NTRS), CREEP PROPERTIES, CERAMICS, FINITE ELEMENT METHOD, LIFE...
Accomplishments achieved during the reporting period are listed. These accomplishments included 6 papers published in various journals or presented at various conferences; 1 abstract submitted to a technical conference; production of 2 animated movies; and a proposal for use of the National Aerodynamic Simulation Facility at NASA Ames Research Center for further research. The published and presented papers and animated movies addressed the following topics: aeroelasticity, computational fluid...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, DELTA WINGS, AEROELASTICITY,...
