Accession Number : AD0885619

Title :   Analytical Aircraft Landing Gear Soil Interaction. Phase III. Rolling Single Wheel Analytical Sinkage Prediction Technique and Computer Program.

Descriptive Note : Interim rept. 17 Nov 69-17 Jun 70,

Corporate Author : DAYTON UNIV OH RESEARCH INST

Personal Author(s) : Luming, Henry

Report Date : MAY 1971

Pagination or Media Count : 73

Abstract : The drag force on aircraft landing gears operating on semi- and unprepared soil runways depends on the sinkage of the tires into the soil medium. This investigation was concerned with an analytical technique for predicting the sinkage of a rolling single wheel. The tire-soil interaction was simulated by a moving surface contact pressure distribution traveling at the aircraft ground forward velocity. The soil was assumed to be an elastic-perfectly plastic medium. The lumped parameter iteration technique was used for obtaining the solution of the three-dimensional dynamic boundary value problem, and a computer program was developed. A test case evaluation was performed. The surface deflections, constant surface displacement contours, and movement paths of selected soil particles are presented. (Author)

Descriptors :   *LANDING FIELDS), (*TRAFFICABILITY, MATHEMATICAL MODELS), (*LANDING GEAR, SOIL MECHANICS, AIRCRAFT LANDINGS, TAKEOFF, AIRCRAFT TIRES, COMPUTER LOGIC, CONTROL SEQUENCES, COMPUTER PROGRAMS.

Subject Categories : Aircraft
      Soil Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE