I am wondering why you used such a short armed swingers? Was there a limiting reason? My objective would have been to get the strongest throw in the swingers at 3PM at peak torque. Which I think would depend on arm length... maybe.
Fletcher: n.b. the pendulum ( contrary to what your Chatbot says can not swing higher, it can only swing faster - and if the fly-wheel increases in average rpm then the pendulum must be swinging thru bottom dead center with greater and greater velocity as rpm increases )
Not sure it said that. Sounds like something I would say but you make sense it is tied to the crank .
“2. Amplitude and Energy: For small swings (which may occur in the described system), the amplitude doesn’t change the period.”
I think the AI was referring to your swingers not the pendulum. Or why can’t the swingers swing higher each time? Which is part of the problem because as they swing they become weightless (partly) to the wheel till it gets locked in by the ratchet.
Somebody needs to do a SIM of how a dropping pivot affects a pendulum. ( see animation of gravity driven sim )
I mean more along the lines of a fixed weight one side and a swinging weight the other and impulse to the wheel where we could see the energy transfer. I don’t think Algodoo give us the information and I am to impatient to learn either properly 8)
daxwc wrote:
Ok I will bite; what are ( soft pawls )? There are many different types and designs of mechanical pawls and ratchets - the objective is to catch the swinger at top of climb and arrest its swing until release at or near vertical ready to go again - some are just small roller bearings inside a casing that friction lock - ateotd it is an engineering issue - B. in MT51 used a common recognized method, altho I think there are more efficient methods available today with less losses and more precise ..
I am wondering why you used such a short armed swingers? Was there a limiting reason? My objective would have been to get the strongest throw in the swingers at 3PM at peak torque. Which I think would depend on arm length... maybe. No particular reason - except the length of the swinger has imo no bearing on how high it will swing ( gain GPE ) and how much torque it will create - a long shafted swinger and a short shafted swinger will gain the same height ( GPE & torque ), all else being equal, but their shafts will be at different angles - a longer one has more flexibility to swing high if and when needed to, say at greater rpms - while perhaps you can pack more in on the same plane with short ones - horses for courses ..
Fletcher: n.b. the pendulum ( contrary to what your Chatbot says can not swing higher, it can only swing faster - and if the fly-wheel increases in average rpm then the pendulum must be swinging thru bottom dead center with greater and greater velocity as rpm increases )
Not sure it said that. Sounds like something I would say but you make sense, it is tied to the crank . Yes, a limited / constrained range of movement to the external pendulum i.e. height it can swing up to .. therefore if the total arrangement gains in Momentum as it increases rpm the external pen must be swinging faster and faster thru bdc i.e. the half cycle time gets quicker and quicker - but it is still limited, slow, inefficient, and cumbersome, compared to the MOI changing driver which I believe replaced it ..
“2. Amplitude and Energy: For small swings (which may occur in the described system), the amplitude doesn’t change the period.”
I think the AI was referring to your swingers not the pendulum. Or why can’t the swingers swing higher each time? Which is part of the problem because as they swing they become weightless (partly) to the wheel till it gets locked in by the ratchet. They can swing higher and higher - that depends on the shaft length, and the bob mass etc - but most importantly on the relative severity of the acceleration and deceleration impulse ( f x t = momentum ) given to the fly-wheel they are attached to - I would expect the swing amplitude to increase as the average rpm increased .. all swinging objects have an acceleration and a tangential inertia which pulls on the pivot while in swing ( Centrifugal forces mv^2/r ) - when locked out they apply their torque at the geo-position the swinger bob is located at ..
Fletcher: I would expect the swing amplitude to increase as the average rpm increased ..
But doesn’t that mean the swingers become even more partly weightless relative to the wheel till they get locked in by the ratchet?
The other side of the wheel has full weight of the mass on it. Are you sure isn't a wash?
" But doesn’t that mean the swingers become even more partly weightless relative to the wheel till they get locked in by the ratchet? "
Think about the linear cart and swinger sim experiments - the reason the swingers gained GPE was because their inertia when unlocked was acting against the cart accelerating or decelerating i.e there was a torque around the swinger pivot connection and its own inertia caused it to rotate and rise upwards - due to Newton's Laws because everything has inertia then when things rotate about a pivot they want to continue in a straight line i.e. tangential force - this pulls on the pivot as it rotates ..
