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  2. Stability derivatives - Wikipedia

    en.wikipedia.org/wiki/Stability_derivatives

    X stability axis is aligned into the direction of the oncoming air in steady flight. (It is projected into the plane made by the X and Z body axes if there is sideslip). Y stability axis is the same as the Y body-fixed axis. Z stability axis is perpendicular to the plane made by the X stability axis and the Y body axis.

  3. The J Curve - Wikipedia

    en.wikipedia.org/wiki/The_J_Curve

    The J is steeper on the left hand side, as it is easier for a leader in an authoritarian state to create stability by closing the country than to build a civil society and establish accountable institutions; the curve is higher on the far right than left because states that prevail in opening their societies (Eastern Europe, for example ...

  4. Stability theory - Wikipedia

    en.wikipedia.org/wiki/Stability_theory

    In mathematics, stability theory addresses the stability of solutions of differential equations and of trajectories of dynamical systems under small perturbations of initial conditions. The heat equation , for example, is a stable partial differential equation because small perturbations of initial data lead to small variations in temperature ...

  5. Nyquist stability criterion - Wikipedia

    en.wikipedia.org/wiki/Nyquist_stability_criterion

    The Nyquist plot for () = + + with s = jω.. In control theory and stability theory, the Nyquist stability criterion or Strecker–Nyquist stability criterion, independently discovered by the German electrical engineer Felix Strecker [] at Siemens in 1930 [1] [2] [3] and the Swedish-American electrical engineer Harry Nyquist at Bell Telephone Laboratories in 1932, [4] is a graphical technique ...

  6. Jakarta–Peking Axis - Wikipedia

    en.wikipedia.org/wiki/Jakarta–Peking_Axis

    To strengthen Indonesia's position along with other anti-imperialist countries, in a speech on the occasion of August 17, 1965, he announced the establishment of the Jakarta–Peking axis. [2] This axis was intended to break the 'Old Established Forces' (OLDEFOS) and rally the 'New Emerging Forces' (NEFOS). [ 3 ]

  7. Plaxis - Wikipedia

    en.wikipedia.org/wiki/PLAXIS

    Plaxis (sometimes stylised in all caps; Plane strain and axial symmetry, indicating the geometric types handled in the original code [1]) is a computer program that performs finite element analyses (FEA) within the realm of geotechnical engineering, including deformation, stability and water flow. [2]

  8. Ship stability - Wikipedia

    en.wikipedia.org/wiki/Ship_stability

    The input axis is the axis about which input torques are applied. For a boat, the principal input axis is the longitudinal axis of the boat since that is the axis around which the boat rolls. The principal output axis is the transverse (athwartship) axis about which the gyro rotates or precesses in reaction to an input.

  9. Longitudinal stability - Wikipedia

    en.wikipedia.org/wiki/Longitudinal_stability

    The longitudinal stability of an aircraft, also called pitch stability, [2] refers to the aircraft's stability in its plane of symmetry [2] about the lateral axis (the axis along the wingspan). [1] It is an important aspect of the handling qualities of the aircraft, and one of the main factors determining the ease with which the pilot is able ...