Ground pressure

Ground pressure

Ground pressure is the pressure exerted on the ground by the tires or tracks of a motorized vehicle, and is one measure of its potential mobility, [cite book
last = Allen
first = Jim
authorlink = Allen, Jim
coauthors =
title = Jeep 4 X 4 Performance Handbook
publisher = MotorBooks/MBI Publishing Company
date =
location =
pages = Page 16
url =
doi =
id = SBN 076030470X ] especially over soft ground. Ground pressure can be measured in (for example) pounds per square inch (PSI) or kilopascals (kPa). Ground pressure can be calculated with the formula (loaded weight divided by ground contact area) [cite book
last = Wenger
first = Karl F.
authorlink = Wenger, Karl F.
coauthors =
title = Forestry Handbook
publisher = New York : Wiley
date = 1984
location =
pages = Page 499
url =
doi =
id = ISBN 0-471-06227-8 ] The ground pressure of motorized vehicles is often compared to the ground pressure of a human foot, which can be 9 - 12 PSI while walking or as much as 1,920 PSI for a person in spike heels [cite book
last =
first =
authorlink =
coauthors = J. William Thompson, Kim Sorvig
title = Sustainable Landscape Construction: A Guide to Green Building Outdoors
publisher = Island Press
date = 2000
location =
pages = Page 51
url =
doi =
id = ISBN 1-55963-646-7 ] .

Increasing the size of the contact area on the ground (the "footprint") in relation to the weight decreases the ground pressure. Ground pressure of 2 PSI or less is recommended for fragile ecosystems like marshes. [cite web | url=http://coastalmanagement.noaa.gov/initiatives/media/bmp.pdf | title=Page 4 of Management of small dock and piers, best management practices, May 2005 NOAA] Decreasing the ground pressure increases the flotation, allowing easier passage of the body over soft terrain. This is often observed in activities like snowshoeing.

Example Ground Pressures

"All example are approximate, and will vary based on conditions"

Human on Snowshoes: 0.5 psi

Rubber-tracked ATV: 0.75 psi

Diedrich D-50 - T2 Drilling rig: 3.8 psi

Human Male (1.8 metre tall, medium build): 8 psi

M1 Abrams tank: 15 psi

1993 Toyota 4Runner / Hilux Surf: 25 psi

Adult horse (1250 lb): 25 psi

Passenger car: 30 psi

Wheeled ATV: 35 psi

Mountain bicycle: 40 psi

Racing bicycle: 90 psi

Notepressures for Man and Horse are for standing still. A walking human will exert double it's standing pressure. A galloping horse will exert up to 500 psi

Related Reading

* Theory of Ground Vehicles [cite book
last = Wong
first = Jo Yung
authorlink = Jo Yung, Wong
coauthors =
title = Theory of Ground Vehicles
publisher = New York : John Wiley,
date = 2001
location =
pages =
url =
doi =
id = ISBN 0-471-35461-9 ]

References


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • ground-pressure pick-up — požeminio slėgio jutiklis statusas T sritis Standartizacija ir metrologija apibrėžtis Požeminio slėgio matuoklio jutiklis. atitikmenys: angl. ground pressure pick up vok. Bodendruckgeber, m rus. сейсмоприемник давления под землей, m pranc.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Ground glass joint — Ground glass joints are used in laboratories to quickly and easily fit leak tight apparatus together from commonly available parts. For example, a round bottom flask, Liebig condenser, and oil bubbler with ground glass joints may be rapidly… …   Wikipedia

  • Ground fighting — (in martial arts sometimes referred to as ground work or ground game ) is hand to hand combat which takes place while the combatants are on the ground, generally involving a degree of grappling. The term is commonly used in martial arts and… …   Wikipedia

  • Ground proximity warning system — (GPWS) is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. Another common name for such a system is ground collision warning system (GCWS). Commercial aircraft The system… …   Wikipedia

  • ground water, confined —    Ground water under pressure significantly greater than atmospheric and whose upper limit is the bottom of a confining unit [22].    See also confined; confining unit; confined aquifer …   Lexicon of Cave and Karst Terminology

  • Ground effect in cars — For another similarly named effect relating to aircraft, see Ground effect in aircraft. Ground effect is term applied to a series of aerodynamic effects used in car design, which has been exploited to create downforce, particularly in racing cars …   Wikipedia

  • Ground effect in aircraft — Aircraft may be affected by a number of ground effects, aerodynamic effects due to a flying body s proximity to the ground.One of the most important of these effects is the Wing In Ground effect, which refers to the reduction in drag experienced… …   Wikipedia

  • Ground pressurisation — Outflow Valve und Overpressure Relief Valve einer B737 800 Cabin Pressure and Bleed Air Control Panels einer B737 800 Unter einer Druckkabine versteht man in der Luft und …   Deutsch Wikipedia

  • Pressure measurement — The construction of a bourdon tube gauge, construction elements are made of brass Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called pressure gauges or vacuum gauges. A… …   Wikipedia

  • ground — ground1 [ graund ] noun *** ▸ 1 surface of Earth ▸ 2 area of land ▸ 3 reason for something ▸ 4 subject/idea ▸ 5 someone s set of opinions ▸ 6 level of progress ▸ 7 crushed coffee beans ▸ 8 in electrical equipment ▸ 9 where ideas develop ▸ 10… …   Usage of the words and phrases in modern English

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”