Question

What are the weakneses of the following forces in modeling the piston:

1-Constant force

2- linear

3-1/2 sin wave

Answer 1

Constant force - on the piston pressure Force is a constant force and will act at a power stroke. So, due to pressure force high compressive stress will generate.

Linear force- on the piston variation of linear force is very dangerous because it will create vibration and noises on the cylinder & piston arrangement and due to wich passenger comfort will decreasses and wear of vehicle happening.

1/2 sin wave - hall mechanism of piston cylinder and crank, connecting rod have sin wave load due to which fatigue will come over the crank and connecting rod .that is why design of crank and connecting rod is very important for connecting and crank shaft we are using forged steel (made by drop forging process ).Due to fatigue crack propagation value is infinite so, we need take care about there should not have any cracks.