cascade lift theory

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turbodog99

Күн бұрын

cascade vex lift

Пікірлер: 7

@mikelwein8301 Жыл бұрын

I’m in a robotics program(FIRST FRC, if you’re familiar) and I needed to 3D model a cascade elevator. I don’t have a lot of experience with them and your explanation was terrific, and I do feel like I understand them much more now, so thanks!

@pedrocarneiro7609 Жыл бұрын

Hi, can you explain if there is any difference in the tension of the ropes of each stage and why?

@turbodog99 Жыл бұрын

Yes, there is a difference. The bottom stage (call it stage1) has the highest tension. Stage2 less. Stage3 even less, and so on. Example. assume a 5 stage cascade lift. Stage 1 supports stages 2,3,4,5, and the load. Chain tension is highest. The last stage, that chain supports only itself (and the load). For each inch stage1 chain moves, each subsequent stage moves 1 inch. So a 1 inch stage 1 movement would mean supporting 4 other stages moving 5 inches total. For each inch stage 5 moves, the chain only supports a 1 inch stage & load movement. It's the whole "work = force x distance" equation. This 'summation' of load/tension/work as stages increase is _why_ it's called a cascade lift.

@pedrocarneiro7609 Жыл бұрын

@@turbodog99 Thanks for the explanation. I undersand that there is a relative displacement bewteen stages of 1 inch if the stage 1 moves 1 inch. So in a 5 stage the total distance travel by the tip of the slide (last stage) is equal to five inches. Regarding the tension in the chains, i suppose that the increasing in the tension is due to at each stage there is an fixed point of attachment and a axle and sprocket point which implies that in a free body diagram of each stage the tension in the chains needs to be different to have equilibirum (i think that this reaosing is more clear for the stage 2 of your prototype, i hope my understanind is correct). I have one other question that is related with the velocity of each stage... For example in the same 5 stages cascade if the velocity of the first stage is V the second one will move at 2*V the third at 3*V and so on right?

@turbodog99 Жыл бұрын

@@pedrocarneiro7609 I would have to do the math, but I'd say the velocity is either a) 1v, 2v, 3v or b) v+k, v+2k= v+3k where k is some constant. But you're correct in theory regardless.