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Search Publications by: Akobuije Chijioke (Fed)

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Displaying 26 - 35 of 35

Stress Analysis of Conical Contact Joints in the NIST 4.45 MN Deadweight Machine

May 10, 2016
Author(s)
Nicholas A. Vlajic, Akobuije D. Chijioke, Ricky L. Seifarth
Structural analysis of conical contact joints in the NIST 4.45 MN Dead Weight Machine using finite element analysis is presented in this paper. This analysis was undertaken due to the observation of surface damage in these joints. Parametric studies are

Elasticity of Mass Artifacts in Sinusoidal Force Calibration

September 4, 2015
Author(s)
Akobuije D. Chijioke, John C. Bankert
Dynamic calibration of force transducers using sinusoidal acceleration of load mass objects requires the accurate determination of the displacement field in such masses, in order to relate accelerations measured at one or a few locations on the load mass

Primary Sinusoidal Calibration of Force Transducers up to 2 Kilohertz

September 4, 2015
Author(s)
Akobuije D. Chijioke, Nicholas A. Vlajic
We report the implementation of a swept-sine dynamic force calibration system at NIST. This system is designed to perform primary calibration of force transducers at frequencies up to 2 kHz and forces up to 2 kN. We show an example calibration of a strain

Dynamic Force Calibration

October 1, 2014
Author(s)
Akobuije D. Chijioke, Nicholas A. Vlajic
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

NIST 1-kilonewton sine force calibration system

January 22, 2014
Author(s)
Akobuije D. Chijioke, Ricky L. Seifarth, Zeina J. Kubarych
Many force-measurement applications are of a dynamic nature, and in recent decades there has been much progress in demonstrating and developing dynamic calibration systems for force transducers. The National Institute of Standards and Technology (NIST), U