- #1

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Do I treat the rims and tires as a cylindrical shell or solid cylinder? Once I find the energy of the tires and rims do I just add that to the 1/2MV^2 for truck and trailer?

thanks.

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- Thread starter CH_GR
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In summary, to compute the energy required to accelerate a truck and trailer from 0 to 60 mph, the moment of inertia of the wheels should be considered. The wheels can be approximated as a combination of the tire and rim, with an inertia of 0.8 times the static mass. This applies to all passenger car and truck tires. The kinetic energy of a wheel is (2/5) times the mass times the velocity squared, and for 18 wheels this is added to the total kinetic energy of the vehicle. The weight of the wheels (mg) can vary, with steel rims weighing 200 lbs and aluminum rims weighing 170 lbs.

- #1

- 3

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Do I treat the rims and tires as a cylindrical shell or solid cylinder? Once I find the energy of the tires and rims do I just add that to the 1/2MV^2 for truck and trailer?

thanks.

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- #2

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- #3

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Does this approximation apply to all passenger car and truck tires?

thanks.

- #4

- 4,662

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So the kinetic energy of a wheel is

For 18 wheels it is

This gets added to the total vehicle kinetic energy:

kE tot =

How much do the wheels weigh (mg)? 200 pounds?

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The wheels weigh 200 lbs for steel rims and 170 lbs for aluminum rims.

Thanks for the info.

Thanks for the info.

The rotational inertia of a truck and trailer is a measure of their resistance to changes in rotational motion. It is also known as moment of inertia and depends on the mass and distribution of mass in the truck and trailer.

The rotational inertia of a truck and trailer can be calculated using the formula I = MR², where I is the moment of inertia, M is the mass, and R is the distance from the axis of rotation to the mass. This formula can be applied to each individual part of the truck and trailer and then added together to find the total rotational inertia.

The rotational inertia of a truck and trailer is affected by the mass and distribution of mass in each individual part. The farther the mass is from the axis of rotation, the higher the rotational inertia will be. Additionally, the shape and size of the truck and trailer can also affect its rotational inertia.

Understanding the rotational inertia of a truck and trailer is important for designing and operating them safely. It can also affect their handling and stability on the road. A higher rotational inertia can make it more difficult to turn or stop the truck and trailer, while a lower rotational inertia can make it easier to maneuver.

The rotational inertia of a truck and trailer can be changed by altering the mass or distribution of mass in each individual part. This can be done by adding or removing weight, changing the shape or size of the parts, or adjusting the position of the mass relative to the axis of rotation. These changes can affect the overall handling and performance of the truck and trailer.

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