Rb1957 - "why wouldn't the reaction be a couple based on 1-2 ?"
Well, look I am not suggesting that I have all the answers by anymeans. I just wanted to join the discussion with my persepective.
But to answer your quesiton, if you attempt to get the reaction forces at 1 and 2 based on the...
I took a look at this for a day or so before replying and I am not so sure about the simplicity of the problem. I do a agree about the pure couple of magnitude T*x (using Zekemems nomincalature). However, I am not sure what we can say about the reactions. To assume the reaction at each pin is...
LOKI - no worries .
Please see the attached FBD for just the little link. I am assuming you know how we arrived at the ground load at B (Rby) - Yes? This was done by doing an FBD on the entire assmebly with your weight and c.g...
Loki - Your c.g. location along with the known weight of 33 Tons (323.6 kN) yield the following in my calcs:
Rby - Total ground force at B = 243 kN
Fcycl (tot) - Total force at the cylinders = 316.5 kN
Fcyl (ea.) - The force required by each cylinder =158.3 kN
So, as others are also saying...
LOKI - Thanks for helping to clarify the load distribution. Sorry I missed it earlier.
I have a question, if the left side is 22tons (215kN) - how did you arrive at Rby =120 kN. I am sorry if I am getting confused. Should Rby = 22 tons (215kN) ? - Just checking.
jlnsol - Sorry, seems like you wasted 3.5hrs. - Look, I don't know why people insist on providing solutions when the position of the C.G is not know. This is the largest load in the system and it is NOT a known location. You say you calculated the cylinder force from the ground force...
Loki - Please see the attached.
This is a plot showing the ratio of Fdc (cylinder load) to the c.g. location of the weight (W). This will give you an idea of what the cylinder force will be as the c.g is moved from 0% (right over the pivot F) to 100% (at the location shown by your RED block)...
Hey Rb1957 - How can you possibly do any meaningful analysis without knowing the center of gravity of the most significant load??
Guys - I really want to help here, and believe me, this IS a simple analysis. What is making this so atrocious is the lack of geometric detail. It seems as though...
Loki - don't panic .
-You need to 1st agree on the analysis the Zekeman, jlnsol and myself are suggesting. Seems as though we're roughly in the ball park with only approximtely dimesnions and rough scaling to work with.
-Later today, please submit the actual dimensions of your system...
Loki - Scaling your image for the dimensions in the same fashion that Zekeman did, I came up with 3.07*W. Please see the attached analysis.
Why did you say "zekeman...my heart just stopped :(((." ...
Zekeman - where did you get the dimensions of the assmebly and link to come up with 2.5W? Sorry, maybe Loki posted them earlier and I just missed it.
Thanks,
OQ172
@rb1957
As with most things you have to make the best reasonable assumptions and shoot for a good approximation in your results. I would think Loki1983 would want to get close in his cylinder sizing and then take the rest emprically once he builds his prototype
You say the link is being...
@ Loki1983 - Yes, I think it's a pretty straight forward problem and you should be able to sum forces and moments to arrive at the correct answer. I am not sure about trying to find out lines of action and intersecting points. For now, try shifting gears a bit and take a closer look at what I...
Hi there,
Please see the attached solution to your link problem. I assumed your were looking for the Force (Fe) from your cylinder to lift (or balance) a load at 'A' in the vertical direciton. I called this load (Ray) in the attached analysis. You will need to provide the values Xae, Yae...
