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Ground Pressure. Rating = 2.6 The lower the ground pressure, the softer the material the vehicle can traverse, i.e. sand or loose gravel. Ground pressure can be decreased by: increasing the surface area of contact between the ground and the vehicle Reducing the vehicle mass

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Ground pressure l.jpg
Ground Pressure

  • Rating = 2.6

  • The lower the ground pressure, the softer the material the vehicle can traverse, i.e. sand or loose gravel.

  • Ground pressure can be decreased by:

    • increasing the surface area of contact between the ground and the vehicle

    • Reducing the vehicle mass

  • Greatest contact surface area can be achieved through using tracks instead of wheels

    • Tracks are incidentally much heavier than wheels, and also emit a much larger audio signature, making stealthy movements difficult at best


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Robustness

  • Rating = 1.7

  • Defined as the ability to withstand punishment

  • As an off road vehicle, the BURRO must be able to withstand jostling from rough terrain and collisions with obstacles

  • If the vehicle were to see combat, it should be able to withstand small arms fire, as there is little doubt a soldier may use it for cover

  • Likewise the BURRO must be designed such that any damage it sustains will not affect whatever cargo it may be transporting


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Amphibious

  • Rating = 3.6

  • The ability to traverse deep water, or ford running water

  • Vital if vehicle is to be able to cross any terrain

  • Helpful in crossing rivers and small marshlands

  • Requires more components

    • Waterproofing

    • Water propulsion

    • Added weight and size

  • Unsure of usefulness

  • Concessions of size and weight


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Fail-Safe Design

  • Rating = 1.5

  • Designs that allow the vehicle to continue to operate without interruption

    • Failures are automatically compensated for

  • Could be implemented into power train and other systems

  • Ensures that supplies are delivered

  • May be difficult to provide total fail-safe design


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Power Density

  • Rating = 1.1

  • Defined as the amount of power delivered by a power source

  • Extremely important

    • Power density must be equal or higher than needed to ensure proper operation

  • Limits the number of power supplies that may be used

    • Some power supplies just do not have the ability to power a system such as the BURRO

  • More weight, speed, etc… = more power density required


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Turning Radius

  • Rating = 2.2

  • Turning radius is important for maneuverability in tight areas.

  • It would be especially important if traveling off-road, in order to maneuver around objects.

  • It can be difficult to get a small turning radius if the steering tires are powered.

  • The shorter the wheelbase the smaller the turn radius.

  • A skid steer design would allow for a zero turn radius, but would require a unique drive train and may effect weight.

  • A skid steer design would also eliminate the need for sensors in the rear of the vehicle because it would not need to reverse.


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Resistance to Anti-personnel Mines

  • Rating = 3.0

  • More than 700 types of known antipersonnel mines; most common is the "blast mine"

  • Usually contains 25g-250g of high explosive (~4190 J/g)

  • Hard to determine force of explosion due to factors such as shape of charge, soil type, depth of mine, shrapnel, etc.

  • Most anti-personnel mine triggers require a minimum weight of ~ 5 kg