| 主权项 |
1. A method of compensating for acceleration induced load error in a load sensor in mechanical communication with a component in a mechanical test system, the method comprising:
measuring an acceleration of the component to obtain an acceleration measurement; measuring with the load sensor, a force applied by the mechanical test system to a test sample in substantially a same direction as the acceleration, to obtain a force measurement; and modifying the force measurement with a transfer function that includes at least one of a gain correction and a phase delay filter to compensate for an error value in the force measurement attributed to movement of at least the load sensor when the force is applied to the test sample, the transfer function determined by:
mechanically applying at least one waveform to the test sample;recording for a period of time, a plurality of acceleration measurements and a plurality of force measurements for each waveform;converting, for each waveform, the plurality of acceleration measurements with a Fourier Transform to create an acceleration frequency response;converting, for each waveform, the plurality of force measurements with a Fourier Transform to create a force frequency response;determining, for each acceleration frequency response of each waveform, an input gain and an input phase;determining, for each force frequency response of each waveform, an output gain and an output phase;determining, for each waveform, a fundamental gain by dividing the output gain by the input gain;determining, for each waveform, a phase difference by subtracting the input phase from the output phase;averaging the fundamental gain from each waveform to determine a gain correction; andconverting the phase difference into the phase delay filter. |
