The discussion revolves around a problem involving a piston and connecting rod connected to a crankshaft, specifically focusing on determining the minimum value of a length parameter L over a period of 1 second. Participants are exploring the relationship between the lengths involved and the timing of the injection period in the system.
Some participants have provided guidance on exploring different values of L and have noted the importance of maintaining the fixed sum of r and L. Others are questioning how to properly relate these lengths to the period of the crankshaft's rotation, indicating a lack of clarity in the problem setup.
Participants are working with specific example values for r and L, and there is an emphasis on the geometric and physical constraints of the system, such as the relationship between the crankshaft's rotation and the piston’s motion.
No, it asks for the minimum L such that the optimum injection period is at least 1s long.Franklie001 said:
L and r are lengths. They cannot add up to a time!Franklie001 said:
L and r are constants in a given design. They do not change with time.Franklie001 said:
You are told that in one particular set up r=0.1m and L=0.3m. You are also told that r+L is the same in all set ups. So what is the general equation relating r and L?Franklie001 said:
A very small value of r makes the amplitude of the stroke of the piston very small, and its linear velocity very low, for one full rotation of the crankshaft (which takes 4 seconds).Franklie001 said: