Effects of Waveform Model on Sensitivity Values of Transducers Used in Mechanical Dynamic Measurements

Abstract

Dynamic calibration of the pressure transducers and accelerometers are carried out by applying dynamic mechanical inputs to them. Determination of those transducers' sensitivities, defined as the ratio of electrical output of the transducer to the mechanical input, is an important task for calibration laboratories. Data obtained during calibration are processed in order to have the peak values of the input and output signals which are sampled by data acquisition boards. Different approximations are made such as fitting the data in the range of 90% of the maximum value for parabola or half-sine waveform. It is clear that waveform model used and also the resolution and the sampling rate of the data acquisition boards have effects on the accuracy of the sensitivity of the transducer. For the investigation, the electrical output signal of the transducer corresponding to the mechanical input is recorded and simulated with different resolutions and sampling rates. Those data are processed for the waveforms of half-sine, parabola, Gaussian distribution. The effect of the waveform model of the input quantities on the dynamic sensitivity is discussed in this paper.

Improvement of dynamic pressure standard for calibration of dynamic pressure transducers

“…The dynamic calibration machine is used to create a half-sinus signal with a width of around 5 ms for calibration of dynamic pressure transducers. The measurement range is from 50 MPa to 500 MPa in hydraulic media with targeted relative measurement uncertainty is 1 % [1].…”

“…The piston is directly located in line the vertical axis of free dropped mass. (Yasin Durgut et al, 2015). Produced charge values by hitting effect of the mass on to the piston are carried through the green charge cables to channel 1 and channel 2 of the Signal Conditioner/Amplifier Kistler Type 6907B.…”

“…Dynamic pressure sensors have a wide area of usage both in measurement and in controlling process in lots of fields like aerospace, medicine production, food processing [1,2]. Some applications show time-invariant static characteristics, so certain types of transducers can be used to measure such static time-invariant value of pressure.…”

An investigation on characterization of dynamic pressure transducers using material impact test machine

“…In drop hammer/mass system configuration, test transducer is mounted to close part of a piston and cylinder unit in a closed reservoir or chamber. Piston-cylinder also [38,39] mounted into a reservoir which is filled with fluid too. Fluid is practically incompressible oil like glycerine.…”

Determination of Pulse Width and Pulse Amplitude Characteristics of Materials Used in Pendulum Type Shock Calibration Device

“…Application of ISO 16063-21 and 22 was introduced by some of the manufacturers [5]. Dynamic calibration of different transducers, such as force and pressure transducers, were investigated * e-mail: eyup.bilgic@tubitak.gov.tr and the results were published, taking care of the applied methods and also of the effects of waveform model [6,7]. Pulse shape effect, uncertainties of the calibrations and also filtering of the noise were studied by various authors [8][9][10].…”