A Method of Determining the Undamped Natural Frequency and the Damping in Over‐damped and Slightly Underdamped Systems of One Degree of Freedom by Means of a Square‐Wave Impact.

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Summary. The method only requires determinations of the amplitude for the full deflection (the static amplitude) and the coordinates to two points of the movement produced by a square‐wave impact. The method requires few computations only. A method has been evolved of determining the undamped natural frequency and the degree of damping for oscillating systems of one degree of freedom which are overdamped or slightly underdamped. A table has been calculated which gives the time taken for a system of a known degree of damping and natural undamped frequency to reach 98 per cent, of its full deflection when influenced by a square‐wave impact.