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I. A. Robinson
THE ARCHITECTURE OF THE NPL NEXT GENERATION KIBBLE BALANCE

This paper provides an overview of the architecture of the NPL “Next Generation” Kibble balance. The balance is intended to realise SI mass in the 100 g to 250 g range with an ultimate target uncertainty of one to two parts in 108. It is intended to be simpler to build and operate than previous generations of Kibble balance with the aim of allowing many more laboratories to participate in the realisation of a global mass scale.

P. Potgieter, S. Davidson, I. Robinson, J. Berry
DISSEMINATING FROM THE KIBBLE BALANCE TO INDUSTRY

The SI unit of mass, the kilogram, was redefined on 20 May 2019. The new definition is made in terms of the fixed numerical value of the Planck constant, h. The kilogram no longer takes traceability from the International Prototype of the kilogram and therefore a new system of traceability and dissemination must now be established to ensure reliable and repeatable measurements for industry. Two methods of dissemination will be compared and evaluated.

André Schäfer
ADVANCES IN THE DESIGN OF DMP41 - MEASUREMENT CHAINS USING EXAMPLES WITH TORQUE & MULTI-AXIS TRANSDUCERS

When evaluating the performance of measuring technology for mechanical quantities based on strain gauges (S.G.), one essential advantage is the possibility to realise smallest measurement uncertainties (MU).
In these applications, S.G. must be able coping with the further tightening of MU budgets. Thus, two advances in the determination of uncertainty of high precision measurement chains based on S.G., are discussed in here. The two uncertainty contributions, what are not always considered so far, are humidity influences and long term stability.
To support today’s sophisticated MU calculations, these two parameters have been further investigated and conclusions are drawn for each of measurement chain elements - reference transducers & precision amplifiers.

A. Prato, A. Schiavi, A. Facello, F. Mazzoleni, A. Germak
EFFECTS OF STRESS-STRAIN DATA SYNCHRONISATION ERRORS ON THE DETERMINATION OF YOUNG’S MODULUS OF HARD AND SOFT MATERIALS IN MATERIAL TESTING MACHINES

In this paper, the effects of stress-strain data synchronisation errors on Young’s modulus of hard and soft materials in typical material testing machines are described. Seven materials, three Cu Cr Zr alloys and four polymers, are tested in two machines conceived for the measurement of the mechanical properties of hard and soft materials. In both machines, the synchronisation of stress and strain signals are guaranteed by the machine’s internal signal processing system. By performing known temporal shifts with respect to each other, the Young’s modulus is calculated. In this way, the variation of Young’s modulus as a function of the temporal shift can be determined and the sensitivity coefficients, to be used in the uncertainty evaluation, derived.

N. Yogal, C. Lehrmann, Z. Song, P. Weidinger, R. Kumme, R. Oliveira
EFFICIENCY MEASUREMENT WITH A FOCUS ON THE INFLUENCE OF ROTATION AND TEMPERATURE ON TORQUE MEASUREMENTS PERFORMED ON SMALL-SCALE TEST BENCHES

Torque measurements that account for the influences of temperature and rotation are vital in determining the efficiency of rotating electrical machines on test benches. During experimental efficiency measurements, the influences of temperature and rotational speed generate errors in the torque measurements that could also affect the overall traceable efficiency measurement on test benches. In this paper, experimental efficiency mapping results with a focus on the influence of rotation and temperature on torque measurements are presented.

J. Sander, R. Kumme, F. Tegtmeier
CREEP CORRECTION METHOD FOR FORCE APPLICATIONS

This paper investigates the creep behaviour of a force transducer at different load levels. Using the results of fast-loading and creep tests, it presents a method for determining a creep correction factor. For this purpose, creep models based on exponentially decaying functions were applied along with an iterative algorithm that takes account of the history of the force-time profile.

H. Kahmann, K. Geva, C. Schlegel, R. Kumme, F. Härtig
FINAL DESIGN OF PTB’S 5 MN·m TORQUE STANDARD MACHINE WITH POSSIBLE FUTURE EXTENSION TO 20 MN·m

This paper describes the final design of the new 5 MN·m torque standard machine which is currently under installation at PTB in Germany. The machine can generate additional components for multi-component investigations and it is capable of applying - to a certain degree - dynamic torques. In the future, it can be extended to a maximum torque capacity of 20 MN·m.

D. Mirian, R. Kumme, R. Tutsch
FIRST STEPS TOWARD LEVERAGING ARTIFICIAL INTELLIGENCE FOR PRECISE CHARACTERISATION OF FORCE TRANSDUCERS

This work is dedicated to the demonstration of a dynamic force measurement system for precise characterisation of the force transducers. The rocking motion of the system as a main dominant source of uncertainty in the acceleration is investigated. We propose a novel method based on the application of an artificial neural network for evaluation of the data as an alternative to traditional approaches to get low-uncertainty calibration measurements. In the end, two special architectures of the artificial neural network, namely Long Short-Term Memory LSTM and Gated Recurrent Network GRU are introduced, and their appropriateness for our use case is discussed.

M. Grum, G. Grgić, D. Knopf, F. Buendia
IMPROVED CALIBRATION METHOD FOR AUTOMATIC CATCHWEIGHING INSTRUMENTS

The paper presents recent developments related to the establishment of a calibration procedure for automatic catchweighing instruments (catchweighers). The main purpose of the proposed calibration method is to provide a basis for traceable measurements of the catchweighers in the dynamic mode of operation outside of the legal metrology framework. The specifics of the instruments’ operation in the dynamic mode are highlighted, the recent modifications in the calibration method and the uncertainty budget are outlined and the results of validation of the proposed method are presented. A good agreement of the performed validation experiments is shown, which could lead to the successful implementation of the procedure in practice.

Ch. Rothleitner, J. Kloß, J. Konrad
MEASURING THE INDUCED AC VOLTAGE IN THE PLANCK-BALANCE WITH AN AC QUANTUM VOLTMETER

The Planck-Balance 1 (PB1) is a compact Kibble balance with the aim to calibrate weights of high quality. In contrast to most other Kibble balances PB1 employs a sinusoidal trajectory in the velocity mode, rather than a linear one. Thus, the induced voltage is an AC signal of 4 Hz. At PTB we implemented a commercial AC Quantum Voltmeter in order to ensure traceability to highest level. Here, we show the working principle along with some preliminary results.

Page 10 of 891 Results 91 - 100 of 8905