![]() The moment of inertia about the Z axis for that cylinder should be 0.250333884 kg m^2 if I've done my maths right. The larger the moment of inertia, the harder is to turn the car around. For my flywheel, using .Volume ends up giving me a mass of about 7.5 kg when multiplied by the density of iron, which seems pretty plausible. For the last time, in english: picture yourself grabbing the car by the front bumper, like Superman, and trying to turn the car in the air around your head. I need to calculate the moment of inertia for the flywheel, this is the main number I need.įollowing the links for moment of inertia on Wiki, I get a mass of about 22kg for a cylinder of 150mm radius, and 40mm height, and if I use the .Volume in Python it matches what I get from the wiki volume calculation for a cylinder. Now it's not going to be a concept2, but it'll be fun anyway! A pic of the flywheel is shown below, I've roughly measured it inside the machine. I'll be adding a new sensor on the flywheel (it only measure the cord being pulled at the minute), and using the maths in the link below to calculate the power, and from there to distance and calories etc etc. The direction of the axis for these moments is defined by the vector associated with them. Select the object to which you want to calculate the moment of inertia, and press Enter. For AutoCAD, the concept is: I is the lower moment through the centroid J is the larger moment. ![]() even for simple rectangular tube the difference is in the magnitude of 400. Have bought myself a cheapo rowing machine, but the computer that comes with it is exceedingly crap (can't even measure strokes accurately!), so thought I'd have a bit of fun building a new one with a raspberry pi! To Calculate a Moment of Inertia (AutoCAD Mechanical Toolset) Click Content tab Calculation panel Moment of Inertia. I dont think torsional constant can replace polar moment of inertia.
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