Abstract
When a build-up system is placed into a deadweight force-standardmachine, the signals from the force transducers contain oscillation componentsthat reflect the dynamic behaviour of the force machine. The deadweightforce-standard machine of 100 kN at the Korea Research Institute of Standardsand Science (KRISS) causes oscillations with component frequencies of about0.28 Hz. These are strongly related to the pendulum motion of the deadweights.This paper describes the behaviour of the deadweights in detail. Theoscillation frequency, as well as the trajectory of the pendulum motion, isinvestigated. Some signal-processing methods that are designed to estimate thedynamic behaviour of the deadweights, by using the force signals from thebuild-up system, are proposed. The relative uncertainty due to the motion ofthe deadweight is estimated. This paper also deals with a modification of thedeadweight force machine that is designed to reduce its pendulum motionsignificantly.
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