Browsing by Author "Duncan, W. J."

Browsing by Author "Duncan, W. J."

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  • The characteristics of systems which are nearly in a state of neutral static stability 
    Duncan, W. J. (College of Aeronautics, Cranfield, 1950-01)
    It is shown that the rate of subsidence or divergence ﮑ of a system which is near a state of neutral static stability can easily be calculated for knowledge of the mode of displacement in the neutral state and this model ...
  • Flutter of systems with many freedoms 
    Duncan, W. J. (College of Aeronautics, Cranfield, 1948-08)
    Experience has shown that it is often necessary to retain many degrees of freedom in order to calculate critical flutter speeds reliably, but this entails much labour. Part 1 discusses the choice of a minimum set of freedoms ...
  • Ignoration of distortional co-ordinates in the theory of stability and control 
    Duncan, W. J. (College of Aeronautics, 1946-12)
    Gates and Lyon have proposed to treat theoretically the stability and control of deformable aircraft by a method in which the distortion co-ordinates are ignored and the influence of distortion is allowed for by suitable ...
  • Some related oscillation problems 
    Duncan, W. J. (College of Aeronautics, Cranfield, 1949-04)
    Two simple means for establishing a relation between a pair of oscillation problems are briefly discussed. In the first, the displacements are connected by use of a differential operator. The set of natural frequencies is ...
  • Technique of the step-by-step integration of ordinary differential equations 
    Duncan, W. J. (College of Aeronautics, Cranfield, 1947-02)
    In Part 1 step-by-step methods are examined critically and emphasis is placed on the dependence of the error on the number n of steps used for a given range of the independent variable. The index of a process is defined ...