Measurement of Aircraft Tire Mechanical Properties Used in Shimmy Analysis by Means of Scale Models PDF Download
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Author: G. H. Nybakken
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
Author: G. H. Nybakken
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Book Description
Author: G. H. Nybakken
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
Author: Samuel Kelly Clark
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 90
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Book Description
A theoretical and experimental investigation of the feasibility of determining the mechanical properties of aircraft tires from small-scale model tires was accomplished. The theoretical results indicate that the macroscopic static and dynamic mechanical properties of aircraft tires can be accurately determined from the scale model tires although the microscopic and thermal properties of aircraft tires can not. The experimental investigation was conducted on a scale model of a 40 x 12, 14 ply rated, type 7 aircraft tire with a scaling factor of 8.65. The experimental results indicate that the scale model tire exhibited the same static mechanical properties as the prototype tire when compared on a dimensionless basis. The structural modeling concept discussed in this report is believed to be exact for mechanical properties of aircraft tires under static, rolling, and transient conditions.
Author: S.K. CLARK
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Book Description
Author: A-5 Aerospace Landing Gear Systems Committee
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The static mechanical stiffness properties of aircraft tires are fundamental to any computation of wheel and landing gear shimmy characteristics, and are important guides in anti-skid system and aircraft wheel design. While the mechanical stiffness properties of aircraft tires are frequency sensitive, the static or low frequency values are important because they are the ones most easily obtained by laboratory testing and are most commonly found in literature.The following recommended methods for measurement of such properties are believed to represent practices which will give reliable and repeatable measurements, either at one facility or among different facilities, using equipment which is commonly available in most tire testing installations.
Author: Robert H. Daugherty
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 108
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Book Description
Author: Robert F. Smiley
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 176
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Book Description
A study is presented of pneumatic tires which are of interest to aircraft designers. The principal topics discussed are tire vertical-force-deflection characteristics; lateral, fore-and-aft, and torsional spring constants; footprint-area properties; relaxation lengths; rolling radius; cornering force, cornering power, self-alining torque, and pneumatic caster for yawed rolling conditions; effects of wheel tilt; and tire radial growth under the influence of centrifugal forces.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721933747
Category :
Languages : en
Pages : 210
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Book Description
The T-45 Goshawk is a United States Navy Jet aircraft used primarily as a trainer. The aircraft design makes use of "off the shelf" hardware as much as possible and was found to have unusual directional control issues during around operations. The aircraft was involved in numerous pilot-induced-oscillation incidents as well as observed to have unusual directional control reactions to failed main gear tires, a condition that is normally handled relatively easily by conventional aircraft steering control techniques. The behavior of the aircraft's tires had previously been modeled in simulators as a result of approximations provided in 40-year-old reference publications. Since knowledge of the true tire cornering and braking behavior is essential to modeling, understanding, and fixing directional control problems, the United States Navy requested assistance from the NASA Langley Research Center's (LARC) Aircraft Landing Dynamics Facility (ALDF) to define the yawed-rolling mechanical properties of the T-45 aircraft tires. The purpose of this report is to document the results of testing the subject tires at the NASA LaRC ALDF in September 1998. Brief descriptions of the Instrumented Tire Test Vehicle (ITTV) are included to familiarize the reader with the ITTV capabilities, data acquisition system, test and measurement techniques, data accuracy, and analysis and presentation of the testing results. Daugherty, Robert H. Langley Research Center RTOP 706-11-02
Author: R. N. Dodge
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 56
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Book Description
Fore-aft, lateral, and vertical spring rates of model and full-scale pneumatic tires were evaluated by testing techniques generally employed by industry and various testing groups. The purpose of this experimental program was to investigate what effects the different testing techniques have on the measured values of these important static tire mechanical properties. The testing techniques included both incremental and continuous loadings applied at various rates over half, full, and repeated cycles. Of the three properties evaluated, the fore-aft stiffness was demonstrated to be the most affected by the different testing techniques used to obtain it. Appreciable differences in the fore-aft spring rates occurred using both the increment- and continuous-loading techniques; however, the most significant effect was attributed to variations in the size of the fore-aft force loop. The dependence of lateral stiffness values on testing techniques followed the same trends as that for fore-aft stiffness, except to a lesser degree. Vertical stiffness values were found to be nearly independent of testing procedures if the nonlinear portion of the vertical force-deflection curves is avoided.
Author: A-5C Aircraft Tires Committee
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The purpose of this SAE Aerospace Recommended Practice (ARP) is to establish guidelines for the measurement of static and dynamic characteristic properties of aircraft tires. It is intended as a general guide toward standard practice, but may be subject to frequent changes to keep pace with experience and technical advances.This revision (Revision A) is also intended to provide suggested guidelines for synthesizing tire dynamic data necessary for landing gear shimmy analyses. ARP4955A has been reaffirmed to comply with the SAE five-year review policy.
