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Member since: Wed Nov 5, 2014, 09:40 AM
Number of posts: 21,892

About Me

46. Small business co-owner. IT Professional by trade.

Journal Archives

NASA fixes Curiosity Rover's "Wheelie" problem

'After 18 months of testing, NASA's pushed a patch to the Mars Curiosity Rover – to extend its wheels' life, and eliminate over-exuberant climbs causing “wheelies”.

Written by NASA Jet Propulsion Laboratory's Jeff Biesiadecki and Olivier Toupet, the software update went live earlier this month, having been uploaded to the famous robot in March.

The space agency has exercised its engineering hive-mind for years about the best way to deal with the dents the wheels have accumulated over the years: such considerations, for example, were a major consideration about the best way to reach Mount Sharp back in 2014.

As NASA writes, the first signs of wear appeared in 2013, and the biggest problem is tackling inclines, when some of the wheels lose grip and start slipping.

“This change in traction is especially problematic when going over pointed, embedded rocks. When this happens, the wheels in front pull the trailing wheels into rocks; the wheels behind push the leading wheels into rocks,” NASA explains.

“In either case, the climbing wheel can end up experiencing higher forces, leading to cracks and punctures. The treads on each of Curiosity's six wheels, called grousers, are designed for climbing rocks. But the spaces between them are more at risk.”

Hence the upgrade: a traction control algorithm that takes realtime data and adjusts each wheel's speed to cut down pressure from rocks.

A wheel's contact points are worked out by measuring changes to the suspension, and the software calculates the right speed to avoid slippage.

The traction control also helps manage unwanted “wheelies”, when “a climbing wheel will keep rising, lifting off the actual surface of a rock until it's free-spinning”. That puts too much load on the remaining wheels, so instead if there's a wheelie, each wheel's speed is adjusted until everything's back on the ground."
Posted by Currentsitguy | Fri Jun 30, 2017, 11:01 AM (2 replies)

What's the catch? This seems waaaaaaaay too cheap for an AR

"EAGLE ARMS 15EA01 EAGLE-15 .223/5.56

On Sale For: $399.99"
Posted by Currentsitguy | Fri Jun 30, 2017, 10:47 AM (29 replies)

Thank the Powers That Be I didn't go to the hospital my family wanted me to.

"Surgeons at the Heritage Valley Hospital in Beaver, Pa., canceled elective surgeries Tuesday and Wednesday, but the Heritage Valley hospitals and emergency rooms remained open.

Heritage Valley continued to make progress restoring its clinical and ancillary care systems Thursday, a spokeswoman said. Regarding whether the system was able to pay a ransom, she said, “Even if we wanted to pay, it is our understanding the have blocked communication with the attackers."
Posted by Currentsitguy | Fri Jun 30, 2017, 09:53 AM (1 replies)

Im home!!!

Well, They sent me home Thursday. I`ve slept a lot since. The major problem I am fighting now is I am completely blocked up from all the painkillers I have been on. I have gone cold turkey, which really hurts, but in the long run I think it will be for the better. It`s very difficult to do any substantial walking, but I am forcing myself. For now my life consists of recliner, toilet, and patio.

It is however, better to be with loved ones and pets. They all sense my discomfort and have seemed to surround me. I spent the last few nights surrounded by at least 3 cats and a dog at my feet. Thank god for my ebook reader. Been catching up a bit and have gone back to a few old friends, so to speak.

ATM, IDGAF about anything even remotely political. It`s not good for the healing process.

Later this week, I am hoping I can get this drain out. It`s not producing a lot and is really uncomfortable.

Once I feel up to it I will post about what it is like to be uninsured and hospitalized.
Posted by Currentsitguy | Sun Jun 25, 2017, 11:01 AM (13 replies)

VERY down. Thought I was finally going home today

Here they have found another abscess. Now a new drain has to be put in, bacteria cultured, more antibiotics...

I'm never getting out of here. All I want to do is hold my wife and pet my dog.

It's like prison. Lousy food, you can't leave, small room. At least I don't have to worry if I drop the soap.
Posted by Currentsitguy | Tue Jun 20, 2017, 11:52 AM (20 replies)

I think a great predictor of you voting habits can be boiled down to one question

Are you an a well and septic? If anyone can post a map with no city water I'd love to see it.
Posted by Currentsitguy | Thu Jun 15, 2017, 08:50 PM (19 replies)

In honor of my still being stuck in the hospital

Posted by Currentsitguy | Thu Jun 15, 2017, 07:03 AM (4 replies)

Workplace multiple shooting at a San Francisco UPS

"San Francisco General Hospital, located about a mile from the facility, was put on alert and told to expect as many as six victims, including the suspect. At the hospital, doctors were lined up outside the entrance to the emergency room, waiting for the injured.

The large UPS processing facility is about two miles south of downtown. The multi-story building is clearly visible along highway 101 as drivers go into downtown San Francisco.

According to reports, the gunman opened fire on the third floor of the building. KCBS Radio reported that the shooter, a male believed to be a UPS driver, was taken into custody and was being transported to the hospital"
Posted by Currentsitguy | Wed Jun 14, 2017, 12:16 PM (3 replies)

Dilaudid is great

You could set me on fire and I wouldn't care. I'm thinking it's time to start telling people what I REALLY think.

Posted by Currentsitguy | Wed Jun 14, 2017, 09:02 AM (8 replies)

Terrible apartment fire in London. Live streams added

Towering inferno:Screaming residents build ropes from sheets and lean out windows as huge fire at West London tower block engulfs the 27-storey building with 200 firefighters struggling to control the blaze

Blaze has engulfed the 27-storey Grenfell Tower in Latimer Road in White City on Wednesday morning

Horrifying pictures emerged on social media showing massive flames licking up the side of the block 

Desperate residents trapped high in the enormous residential tower were heard 'screaming' for help 

Police are evacuating people and two residents are already being treated for smoke inhalation  

Posted by Currentsitguy | Tue Jun 13, 2017, 09:54 PM (11 replies)
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