Test of Impact of Vibrations Frequency on Mean Errors of the Precise Height Differences Measurement with Analogue Automatic Leveller Ni002

Abstract

The article describes the results of tests carried out to determine the measurable effect of vibrations on the accuracy of measurements with an automatic precise leveller. It contains specification of the research station created to examine the case and description of factors affecting the measurement results. The multi-frequency vibrations were forced on a leveller during measurements and calculated mean errors for each frequency analysed. The range of frequencies for which the measurement was possible was estimated. The obtained results can be helpful in the engineering measurements designing, especially in industrial areas, where vibrations are an inseparable element of the environment.

Test of Vibrations Influence on the Measurement Accuracy in the Precise Digital Leveller Trimble Dini 03 and Comparison of Its Vibration Sensitivity with Leveller Ni 002

“…The research results presented in this paper are a continuation of the work described in the article by Kurnatowski [8]. In the current part of the research, an experiment was carried out to determine the effect of vibration frequency on the Trimble Dini 03 digital level, including the measurement of the amplitude with a vibrometer.…”

“…In the current part of the research, an experiment was carried out to determine the effect of vibration frequency on the Trimble Dini 03 digital level, including the measurement of the amplitude with a vibrometer. The leveller was tested with the same test stand that was used to test the Ni002 level [8]. A standard wooden tripod was equipped with an 80W modelling motor with an eccentrically mounted weight (Fig.…”

“…The rotating mass constantly make the compensator tremble, reducing its ability to stabilize quickly [3]. The measurement of the rotation speed, and therefore the frequency of vibrations, was performed with a factory calibrated optical tachometer Testo 465.Earlier studies [8] showed that for this test stand the natural vibration frequency of the leveller is the same as the motor rotation frequency. The vibratory source is not a point source in reality [9], but this research focus on vibration parameters of the leveller, not vibration sources.…”

“…The measurement took place in the main hall of laboratory of the Faculty of Civil and Environmental Engineering of the West Pomeranian University of Technology in Szczecin, Poland. The same measurement conditions were maintained as in the case of the test of Ni 002 level [8]. The indoor test stand excluded factors that affect the measurement, such as wind pressure, temperature and sunlight variability, or vibrations caused by city traffic.…”