Dynamic calibration still poses many challenges for measurement and data analysis. However, we show that without a proper dynamic calibration misleading results are obtained as static calibration approaches to dynamic measurement applications are inappropriate. We illustrate expected improvement in uncertainties when dynamic calibration information is available, and we conclude that further research in this direction is necessary in order to improve measurement capabilities and reliability.
Obtaining the fast dynamic pressure signal is necassary for the dynamic checks and calibrations for the dynamic pressure sensors as well as data acquisition part, conditioning units and amplifiers in dynamic measurement phenomena. For this purpose a drop mass system was developed. This paper describes the drop mass system improved and used for the dynamic calibration of pressure transducers in hydraulic media at Tubitak UME of National Metrology Institute of Turkey.
The utilization of dynamic methods for the measurement of operating parameters of road vehicles is beginning to grow due to small time-consuming and low initial investment funds. Dynamic measurement of power parameters of the engine or brake are generally based on the knowledge of the moment of inertia of the rotating masses both of engine and transmission system including driving wheels. Based on the same assumption, dynamic measurement methods can be used to determination of athlete’s physical performance. The results may serve primarily in the sports training area to determine the...
Maximum value of the heavy goods vehicles axle load is the main factor accelerating the pavement damaging process. We propose two algorithms for maximum load estimation on the basis of weighing results obtained in Weigh-in-Motion systems (WIM systems). The simulation (Adams/Car) and experimental test results from an instrumented vehicle have been presented. The difficulty of the maximum load estimation consists in the fact that WIM system provide only several samples of the axle load.
Contributions of uncertainty budgets suitable for special applications of reference torque calibration facilities are calculated with a Monte Carlo method implemented in a spreadsheet software application. The simulations were combined with measurements of parameters with a high number of observations and compared with usual simplified uncertainty estimations for examples of uncertainty contributions concerning traceability of voltage ratio, noise, resolution and position effect. The results are more differentiated and detailed than usual GUM estimations and provide deeper understanding...
A new type of mass comparator (AX1007CP), designed for use under a constant pressure has been evaluated. The comparator has a readability of 0.1 µg and an electrical weighing range of 1.5 g. It is installed inside an airtight stainless steel chamber allowing mass comparisons to be performed under fixed environmental conditions. This paper describes the use of micro-mass standards to assess the linearity of the comparator at points evenly distributed across the weighing range.
This paper present the completion and the measurement uncertainty budget of a multi-component measuring facility. The new facility is part of the 1 MN force standard machine of the PTB. It enables the simultaneous generation of a torque in the range from 20 N·m to 2 kN·m in addition to axial forces 20 kN to 1 MN. This allows the characterization of measuring systems which require combined loads of axial forces F z and torques M z like friction coefficient sensors. The aim is a measurement uncertainty of ( k = 2) for M z < 0.01% and F z < 0.002%. The physical model yields to extended...
In this paper, newly developed 200 N capacity dead weight force standard machine which is established at UME and TSE will be summarized. The 3 different mass stacks are used for calibrating the force-proving instruments together with 3 different loading frames. In the first mass stack, there are two force ranges which are 10 N and 20 N. In the second mass stack, there is only one force range is 50 N and the last one, there are also 2 force ranges are 100 N and 200 N. Each loading frame generates the first force step. This machine is developed as computer controlled system for automatic...
A new dead weight type force calibration machine with a 1 kN loading capacity both in tension and compression is installed both in force laboratory of UME and TSE. This paper describes the preliminary results of the performance of the newly developed 1 kN dead weight force machine at the Force Laboratory. The machine is designed and manufactured by UME. The performance test results show that relative reproducibility error with rotation ( b ) ± 5,5 × 10 -3 and relative repeatability error without rotation ( b ’) ± 3,5 × 10 -3 for a range of 0,2 kN to 1 kN of a new 1 kN machine of TSE.
The kilogram will soon be realized in terms of the Planck constant within a vacuum environment. This realization must be transferred to air and then disseminated to the international measurement community. This paper describes the NIST implementation of a mise en pratique for the future realization and dissemination of the kilogram using a watt balance and a unique vacuum-to-air transfer method based on a magnetic suspension technique.