The aim of the JRP is to focus the interests of different NMIs and industrial branches on the topic of dynamic measurement and to synergize the similarities appearing in the measurement technology, the signal types, and the mathematical tools of data analysis between the different measurands. Thus, in a joint approach, methods for the dynamic characterisation of measuring systems, estimation of their measurement uncertainty, and the use of these characterisations in industrial applications will be put on a sound metrological footing.
The synergetic approach is represented by the workpackage structure where the experimental work divided by measurand (WP 1 to 3) is supplemented by two workpackages dealing with the supplementary part of the measuring chain, namely the conditioning amplifier (WP 4), and the mathematical challenges of data analysis and measurement uncertainty (WP 5).
The additional work packages take care of the dissemination of the results to the wider metrological and industrial community (WP 6) and of the proper management necessary to cope with the ambitious goal of the JRP.
WP 1 Dynamic Force
In the field of dynamic force calibration, some prototype devices and methods for the application of sinusoidal or shock forces have been developed. However these approaches currently lack traceability to primary standards. In this project primary sine-force facilities with frequency range from DC to 1 kHz and amplitudes up to 10 kN will be developed to provide traceable force calibration for sinusoidal force excitations. This JRP will also carry out the research needed to establish shock force calibration techniques and primary shock-force calibration procedures with amplitudes up to 250 kN. Moreover, model-based parameter identification methods will be developed, implemented and validated at PTB, LNE and CEM for both shock and sinusoidal input signals in conjunction with WP5. Consistency between sine and shock calibration results, and agreement with static calibrations at the low frequency limit will be demonstrated.
WP 2 Dynamic Pressure
NMIs and specialist manufacturers have developed various dynamic pressure generation systems. These systems use a range of pressure generation techniques, but they all lack absolute dynamic pressure traceability. This JRP will carry out the research required to allow traceability to be achieved, including specifically the use of shock tubes as calibration tools. New systems capable of generating specific pressure waveforms will be designed, commissioned, and used to calibrate industrial transducers against the reference transducers characterised in the primary systems.
WP 3 Dynamic Torque
Within Europe the state of the art in relation to dynamic torque measurements is at a low level. PTB is the only laboratory that has an experimental set-up for such measurements and even this is a prototype “proof of concept device” with a low torque amplitude of approximately 5 N·m. This device operates with sinusoidal rotary excitation and laser interferometric angular displacement measurement. Methods for validating torque transducers will be established and a primary sine-torque facility with frequency range from 10 Hz to 1 kHz and increased amplitudes of up to 20 N∙m will be developed.
WP 4 Measuring Amplifiers
Signal conditioning components such as measuring amplifiers have a frequency-dependent response of their own, which needs to be accounted for to achieve accurate and reliable dynamic measurements. Up to now, for example the calibration of bridge amplifiers is generally done only statically. The aim of this JRP is to provide the instrumentation, techniques and procedures for dynamic primary calibration of measuring amplifiers used for dynamic measurements of mechanical quantities such as force, torque and pressure in the frequency range from DC to 10 kHz.
WP 5 Mathematics
To achieve traceability for dynamic force, torque and pressure, new methods for the evaluation of uncertainties are needed which are consistent with those employed in the static case. To this end, this JRP will establish dynamic models for the complete calibration measurement chain of the three mechanical quantities force, torque and pressure and develop procedures for uncertainty evaluation in dynamic calibration in line with standard uncertainty evaluation for static measurements. The development and application of mathematical and statistical methods are also fundamental to delivering traceability to industry at the application level. This JRP will therefore carry out research for the design of appropriate deconvolution filters based on dynamic models for dynamic measurements utilizing the models determined at the calibration level and develop procedures for evaluating and propagating uncertainties in dynamic measurements in line with standard uncertainty evaluation for static measurements.
WP 6 Impact
In order to ensure that the projected impact identified in section B is realised, this WP is implemented to care for scientific publications, meetings and workshops, web-based software and draft standards. In addition to the specific deliverables of this WP, the technical work packages (WP1-WP5) themselves deliver further reports and software that are essential for JRP impact.
WP 7 Management
The coordination and management of the JRP will be handled mostly in this WP. Major decisions will be made here. Financial as well as progress reporting are within the scope of this WP as well as the handling of risks and their mitigation. For this purpose the coordinator of the JRP will be supported by a JRP management board consisting of key members of the project.