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Page 96 of 977 Results 951 - 960 of 9762

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.

Z. Song, P. Weidinger, N. Yogal, R. S. Oliveira, C. Lehrmann, R. Kumme
APPLICABILITY OF TORQUE CALIBRATION ON TEST BENCHES FOR ELECTRICAL MACHINES

The traceability of torque measurements on test benches for electrical machines is primarily established by the static calibration of a torque transducer. However, the loading conditions and signal processing methods are generally different for the static calibration and the measurement on a test bench. Therefore, the applicability of the calibration should be clarified before applying the calibration results for further analysis. In this paper, the torque measurement chain using a power analyser on a test bench for electrical machines is compared to the measurement chain used in the standard calibration procedure DIN 51309.

M. Pabst, T. Fröhlich
CENTRE OF GRAVITY MEASURING DEVICE

This paper describes a new method to measure the height of the centre of gravity of high-sensitive mass artefacts. A measuring device is presented and tested with mass samples of various shapes and densities. The results of the measurements are compared to the geometrical estimated heights of the centre of gravity and further developments of the new instrument are presented.

Li Wansheng, Zhao Yucheng, Tao Zecheng, Huang Weijun, Sun Yong, Dai Jun
THE DESIGN OF 30 MN HYDRAULIC AMPLIFICATION FORCE STANDARD MACHINE AT SHANDONG INSTITUTE OF METROLOGY

This paper describes the design and construction of the hydraulic amplification force standard machine of 30 MN (so-called Pascal-type), which will be the biggest force standard machine by hydraulic amplification in the world. The main elements and the most critical components of the machine were expounded, including the hydrostatic support cylinder and the dead-weights groups, which directly affect the system accuracy, and determine the measurement range. The performance of the machine maximises the use value for the user. This machine will play a very important role in promoting the development of high-precision large force metrology technology.

Page 96 of 977 Results 951 - 960 of 9762