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tekochip
User Rank
Platinum
Plumbing
tekochip   10/24/2013 8:13:40 AM
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An interesting idea.  There would be less plumbing; fewer hoses to dry out, seals to fail and losses from the hoses flexing during actuation.  I wonder if there is a weight benefit from the reduced plumbing too.


RogueMoon
User Rank
Gold
variable speed pumping, nice idea
RogueMoon   10/25/2013 9:08:21 AM
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This is a nice idea.  Variable speed pumping opens up possibilities rather than crashing the energy into losses across valves.  As it often snows in Indiana, they might have a good opportunity to try out this modified loader in a real world application by moving the snow from the parking lots.  Winter is coming!

TJ McDermott
User Rank
Blogger
Individual Servo Pumps - COOL!
TJ McDermott   10/25/2013 5:25:49 PM
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Someone had a lightbulb moment when they came up with a pump for each actuator.

Charles Murray
User Rank
Blogger
Re: Individual Servo Pumps - COOL!
Charles Murray   10/25/2013 6:57:51 PM
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I agree, TJ. This is an important story. Who would have thought that software could replace a hydraulic valve? 

Elizabeth M
User Rank
Blogger
Re: Plumbing
Elizabeth M   10/28/2013 6:27:36 AM
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I didn't think of that, tekochip, but I'm sure weight would be a factor as well. In this case, less weight would also add to fuel efficiency, in that there would be less vehicle volume to power.

Elizabeth M
User Rank
Blogger
Re: variable speed pumping, nice idea
Elizabeth M   10/28/2013 6:48:50 AM
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Ah, I take it you either live in Indiana as well or somewhere in the Midwest, RogueMoon, where winter is rapidly approaching, I'm sure! That does sound like a good test. Snow is quite heavy and dense, so it would be a good way to see how the new machine performs.

Elizabeth M
User Rank
Blogger
Re: Individual Servo Pumps - COOL!
Elizabeth M   10/28/2013 7:12:42 AM
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I agree with you guys, TJ and Chuck--it seems like an obvious fix in some ways, so I am surprised someone didn't come up with it sooner. But now they have, and it should be a great boon for designers of these machines in terms of making them more economical and fuel efficient.

Ann R. Thryft
User Rank
Blogger
Re: Individual Servo Pumps - COOL!
Ann R. Thryft   10/29/2013 3:47:58 PM
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My nephew drives, and maintains/repairs, machines somewhat like these for the City of Abilene, TX, to remove objects from storm drains and creeks. Looks like a brilliant idea.

kf2qd
User Rank
Platinum
oR IS JUST A TRADE FOR MORE COMPLEXITY?
kf2qd   11/8/2013 10:07:01 AM
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More pumps and more pump controllers. Sounds like adding a bunch of complexity. And more service costs because of what will have to be repaired/replaced when something doesn't work.

 

Needs to be tested for 4000 hours at max load and and extreme temperatures to see how it might hold up. And then needs to be left sitting outside in extreme weather for a year. If it still works without major service it might be practical.

Sorry if I sound pessimistic, but I have used these devices and have a son who maintains this kind of equiptment.

William K.
User Rank
Platinum
Re: Individual Servo Pumps - COOL!
William K.   11/9/2013 8:54:02 PM
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A pump for each actuator is an eay way to grow the system almost without bounds. And each pump would need to be an expensive variable displacement reversable flow type. And the plumbing would become a bit heavier as well.

The ultimate solution would be a single reversable-flow pump under software control, and a large number of on/off low pressure drop routing valves to select which function got the pressure and flow at any particular time. It would make the software a bit more complex, but it would reduce both the losses and the number of pumps. But the plus side is that it could easily contain it's own diagnostics. But it would indeed be a bit more complex than present systems, but not a lot. And the best part is that it would not really require any new hardware being created.

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