Abstract
The use of impedance heads for the measurement of the point mechanical impedance of structures is discussed. It is shown that instruments of this type are subject to an error in the acceleration measurement which is proportional to the force input to the structure through the impedance head and to the square of the frequency, and is inversely proportional to the stiffness between the structure and the point at which the acceleration is measured in the instrument. Methods for minimizing this error are discussed but it is shown that the existence of the error is an inevitable consequence of attempting to measure the force input to the structure and its response at the same point.
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