The consequences of not knowing the value of measured forces in terms of meaningful units are significant. In the first place it becomes impossible to standardize an operation based on the measured force value so that it is independent of the particular transducer used to perform the measurement. This also makes process modification difficult, as any such modification that affects the force measurement system will require a new determination of the best force values for the operation. It also means that measured force values cannot be compared to measurements made with other systems (including for example reference data), or to theoretical calculations. Finally, it means that the measured force values cannot be used to determine other quantities - for example force measurements cannot be combined with velocity measurements to determine power expenditure. Dynamic force calibrationDynamic force calibration aims to address the need for accurate measure- ments of rapidly-changing forces by directly calibrating force transducer systems under dynamic loading conditions. Measured time-varying forces are applied, and measurements are made of the time-varying transducer output. A system has been constructed at NIST to perform such calibration with sinuoidal loadsup to 2 kN in amplitude and up to 2 kHz in frequency.
Test Engineering and Management
Dynamic Force, Force Measurement, Calibration, Force Calibration, Traceable, S.I., Harmonic Force