Reduction of deadweight pendulum motion and its conformation by using a build-up system

Abstract

Deadweight force machines cause oscillating components strongly related to the pendulum motion of the deadweight in the measured force signals. An estimating method of the pendulum motion using a build-up system has been proposed in previous papers. In this paper, the estimation algorithm was confirmed by comparison with the directly measured trajectory through the analysis of a 500 kN deadweight force standard machine in Korea Research Institute of Standards and Science. After the dynamic analysis of the force machine, it was modified to decrease the pendulum motion effects by accurately controlling its loading speed. As a result of the modification, the oscillating level due to the dynamic behavior of the force machine has been reduced considerably.

Analysis of mechanical properties for the key force transfer components of 2 MN deadweight force standard machine

“…The theoretical value of uncertainty of DWM measurement is 1 × 10 -5 , but the actual value is only 5 × 10 -5 [1]. There are many factors affecting the measurement uncertainty of DWM, usually including the local acceleration of gravity, weight material density, uncertainty of weight mass, the density of air quality, the swing of the central boom and beam tilt (the uncertainty of DWM and the force transducer structures) [2][3][4][5][6][7]. Also, it includes the influence of tidal level effect on gravitation, the influence of air conditioning airflow, the influence of gravitation between weights, humidity, temperature, hardness of the pad, and so on [8].…”

Design and Manufacturing of a High Capacity Deadweight Force Standard Machine

“…The Korean Research Institute of Standards and Science (KRISS) has installed six deadweight force standard machines with capacities of 20 N, 200 N, 5 kN, 20 kN, 100 kN, and 500 kN. Among them, the 500 kN deadweight force machine [2] force standards. Therefore, KRISS has decided to develop a new deadweight force standard machine to replace the 500 kN deadweight force standard machine, and launched the project in…”