Abstract
A transient gravimetric method is described by which force gauge response characteristics are determined by measuring the response of the force gauge to a unit step force input which is created by suddenly lifting a known mass from the gauge. Absolute estimates of gauge sensitivity and frequency response can be obtained directly from the time history by measuring the response step height and time decay parameters or by taking the time derivative of Fourier transform of the time history. Magnitude and phase errors associated with the basic technique and the processing options will be examined and compared to currently accepted approaches. Of particular concern in this study are phase errors of the order of three degrees or less which have been shown by the authors to yield significant inaccuracies in power flow measurements [J. Acoust. Soc. Am. Suppl. 1 76, S66 (1984)]. Results of an investigation of cable motion induced case strain on force gauge response performed using a lift test in conjunction with a vibration shaker test will be described. [Research supported by David Taylor Naval Ship Research and Development Center, Washington. DC.]
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