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The Joule Balance is one of the several promising methods for the precise measurement of the Planck constant h to redefine the kilogram. Compared with the Watt Balance, it benefits from its all static measurements. For the new generation of the Joule balance, a magnet system with high-permeability material is designed to reduce the problem of coil heating. Simulations are carried out to demonstrate...
In this paper we present a new hybrid finite-element/component-modeling approach that can predict the pull-in and release behavior of MEMS switches orders of magnitude faster, and with significantly more behavioral detail, than traditional finite-element or formula-based approaches. The speed and detail allow exploration of the design space, guidance for design-of-experiments, and insight into process...
Cable-driven parallel manipulators (CDPMs) are a special class of parallel manipulators that are driven by cables instead of rigid links. Cables have unilateral driving properties so that redundant actuation is required to maintain positive cable tensions. Due to the actuation redundancy, there exists an infinite number of tension solutions for every CDPM's pose. In this paper, a gradient projection...
A new Joule balance project has been in progress for three years in NIM, China. In this paper, the general configuration and the main parts of the magnetic system currently in development are presented. The spatial distribution of magnetic field of Joule balance was measured, which verified the existence of annular homogeneous magnetic field. The measured value matched to theoretical calculation value,...
To accurately measure the magnetic energy difference at different positions, the Joule balance is designed to work under a high stability and sensitivity environment. This paper presents the detailed design of balance system, the vibration characteristics of the balance foundation and the deformation of balance beam. The experimental results show that the maximum displacement of foundation is detected...
The authors describe a development in relaying hardware and philosophy which has been made possible by DSPs and industrial grade PCs. The goal of an open relaying philosophy can be realized. The utility would be able to choose its relaying functions to suit its particular requirements. Details are given of a prototype design capable of being assembled and configured by a utility. Results of tests...
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