CoA. ASAE Reports (1966-1969)

Permanent URI for this collection

https://dspace.lib.cranfield.ac.uk/handle/1826/10652

Browse

Recent Submissions

Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    The experimental determination of tyre model parameters
    (College of Aeronautics, 1966-09) Ellis, J. R.; Frank, F.; Hinton, B. J.
    SUMMARY This report describes the analysis of a series of experiments on pneumatic tyres which were designed to test the various hypotheses: regarding the deformed shape of a tyre during the steering process. The experiments consisted of several separate tests first described in Ref. 1 and 2. a) The application of a point lateral force or a moment at one position on the tread band which is restrained at the centre of the wheel, and the measurement of the resulting lateral deflection of each point of the tyre perimeter. b) The application of a uniform force around the tyre perimeter on a hollow cylindrical former and applying a load at the centre of the wheel. c) Direct determination of tread band tension by cutting the tread band and bridging the cut by a dynamometer. d) Estimation of the bending modulus of the tread band by test on sections cut from the tread band. The analysis of the experiments is carried out by first transforming the test results into a Fourier series and determining the spectral content of the bending line with an harmonic analysis. Transfer functions of beam and string models are derived and applied to the test results. A method of considering a three parameter model is described.
  • Thumbnail Image
    ItemOpen Access
    The digital simulation of a turbo-charged diesel engine
    (College of Aeronautics, 1969) Shroff, H. D.; Hodgetts, D.
    A mathematical simulation of a six cylinder four stroke water cooled diesel engine is described and then used to study the changes in performance caused by variations of engine paramters and operating conditions. The results are discussed with reference to the mathematical model employed and the physical system. A limited study, to demonstrate the applicability of the simulation, considers the optimisation of a variable geometry system to achieve a performance target.