Inertial Force

I would have thought rubber buffers would be the quietest.

ya right Mr.Tonys. My intension is to stop banging of the trolley on to the stopper. So, what i mean is i need the trolley to stop on its own inertial force. My doubt is will the trolleys will collide each other and produce sound.

lets come to your point, even if we use rubber stoppers at the end wont the trolleys collide each other?

Nice idea. GA

guru,its a total load of 85 tones and friction factor is .o5.

my doubt is that will those trolleys will hit and produce sound or not..

I think the OP is asking a slightly different question.

When the trolleys are released they will coast to a stop. If they are allowed to free-wheel then (provided all are identical in Coeff of friction) they will all slow equally and in unison with each other and there would be no bumping.

(In an ideal world this might be possible.)

You might consider turning the multiples into a singular by bracing the distance between the trolleys so no forward movement occurs on the shackle and pin. It still has the same drag and weight but no noise would result because there would be no contact..

The best way to avoid the collision of the end trolleys into the ones in front is to stop the forward motion by applying the brakes to the last rear trolley only. This keeps tension along the line and prevents any trolley from rolling into the one ahead of it.

This is cheaper than applying brakes to all trolleys. one could even add a brake trolley to attach to the last trolley.

Another way is to increase the coefficient of friction on all trolleys. I saw this in the Azores Portugal with the ox carts. By not greasing the axles they reduced the need for brakes.

In engineering we call that dampening.

The speed of 3.6 inches per second is not very fast but the load inertia is huge.

If you have to position these trolleys accurately you could also use a stop block at each trolley. a lever or solenoid operated gate that blocks the trolley from rolling into the next one. This would work in conjunction with the winch stopping and perhaps a short free roll to reduce the inertia.

Spring bumpers on the stop blocks would be advisable due to the large load.

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Friction coeff. is not something you can rely on being stable. It will vary on both predictable and random factors. When designing one should concider worst case scenarios. I wouldn't think for such a construction with more than 25 Joules k. energy on each trolley and no braking capability for starters.

Thank you guys..

thanks alot for guiding me..