IMEKO Event Proceedings

Page 850 of 866 Results 8491 - 8500 of 8655

Jeffrey Dosch, Mark Schiefer
VIBRATION-BASED METHODS FOR EVALUATING LINEARITY OF DC-COUPLED VIBRATION ACCELEROMETERS

This paper describes a shaker technique for measuring nonlinearity of accelerometers. The method has application to acceptance testing of DC-coupled accelerometers where the use of a centrifuge is cost prohibitive. To demonstrate the utility of shaker-based methods, nonlinearity tested by both centrifuge andshaker is compared.

Ivan Gašparac, Zlatko Maljkovic, Mario Vražic
VIBRATIONS MEASUREMENT DURING HYDROGENERATOR TESTING

This paper presents the results of vibration measurement during several specific tests of 35 MVA hydro-generator.

L. Cocco, P.Gazzola, S.Rapuano, L. Rossi
VIBRATIONS MEASUREMENTS OF FORMULA ONE CAR ELECTRONIC DEVICES

F1 car is a very critical system in terms of temperature, shock and vibrations. For this reason, usually, automotive standards are no adequate for motor-sport electronic applications. Further peculiarity of F1 automobiles is the periodic change of vehicle dynamic setting. Vibration monitoring techniques are being used by F1 teams mainly to spot mechanical imbalances and, consequently, to define a car’s set up. In the competitive race context, also it is mandatory to improve the electronic components reliability, to optimize their maintenance time, to control the quality of their manufacturing and to take into account their noise and vibration pollution. This paper presents an experimental vibration measurement system implemented on Ferrari racing car model 248F1.

Dorel Aiordachioaie, Theodor D. Popescu
VIBROMOD - An experimental model for Change Detection and Diagnosis Problems

The objective of the paper is to introduce an experimental model (VIBROMOD) designed for solving change detection and diagnosis problems in various fields of applications, mainly vibration engineering. The hardware structure contains two basic levels: one for fast computations and alarms, which processes data in a matter of hours, and, an upper level, for large-scale monitoring and statistical computation of moments, over a time span of days and months. The algorithms running on VIBROMOD are coming from a specialized toolbox, which contains classical methods, based on statistical signal processing techniques, but also some advanced methods, based on time-frequency and information transforms. The monitored interaction between VIBROTOOL and VIBROMOD is the goal of a large project called VIBROCHANGE, and allows for rapid implementations, checking and testing of various algorithms and the development of benchmarks as well, for change detection and diagnosis problems.

Tassanai Sanponpute, Wasin Limthunyalak, Febo Menelao, Dieter Schwenk
VICKERS INDENTER SHAPE MEASUREMENT BY USING SCANNING CONFOCAL CHROMATIC INSTRUMENT

The measurements of Vickers indenter angles had been studied with different instruments. Most of them are specially designed for this purpose. Scanning confocal chromatic instrument is one possibility. In this study, the geometry of Vickers indenters was measured by such instruments. This study involved calibration, investigation of stability and comparison of measurement results on Vickers indenters.

A. Lay-Ekuakille, P. Vergallo, A. Massaro, D. Caratelli, A. Trotta, R. Malaric
VIDEO SURVEILLANCE AND SIGNAL PROCESSING OF PIPELINE LIQUID FLOW

The quality and the quantity of liquid fluid flow in pipelines is a crucial issue for human beings’ daily life, especially for leak detection. The control and managing of pipelines have been assuming a major importance for all kinds of fluids to be conveyed through. When the fluid is like oil, hazardous fluid and/or water for human beings’ necessity, the monitoring of pipelines becomes extremely fundamental. For complex pipeline networks, even if flowmeters deliver data about fluid quantities, they cannot be used for each part of a complex and extended network because of heavy increasing costs. The research proposes the use of video surveillance in terms of video validation of a magnetic flowmeter in order to measure the amount of fluid by using only video camera located on an analog flowmeter. A specific algorithm has been developed to process liquid frames.

A. Chunovkina, K. Sapozhnikova, R. Taymanov
VIM AND CURRENT TENDENCIES IN MEASUREMENT SCIENCE

Some proposals with regard to the future version of the VIM are given. The proposals concern definitions of the terms "measurement", "nominal property", "metrological traceability", "sensor", "measuring system", etc. A necessity to apply measurements to new fields and take into account new technologies is grounded.

Artur Skórkowski, Adam W. Cichy
VIRTUAL CAPACITANCE METER BASED ON IMPEDANCE MODULUS MEASUREMENT

The capacitance can be calculated from the impedance modukus value of the object under test. It is possible, if a two-terminal network is represented by a series connection of a resistor and a capacitor and the reactance of the capacitor is considerably greater than the resistance (e.g. in a low-loss capacitor) In this case the error of the approximation can be omitted. A virtual realization of such meter has been presented in the paper. This one shows the idea of the signal processing in the quasi-balanced circuit. Quasi-balanced circuits are the AC circuits designated for impedance component measurements. Similar as teh balanced circuits, the quasi-balanced circuits have a special status called a quasi-balanced status. This is usually a phase shift between two selected signals of the circuits. The circuit is driven to the quasi-balance status by controlling of only one variable element and then the value of the measured impedance component can be calculated using the adjusted value of the variable element. The meter has been built with the application of the data acquisition card USB NI-6009, which has been controlled by a software programmed in the LabVIEW environment.

Adam Gąska, Ksenia Ostrowska, Wiktor Harmatys, Piotr Gąska, Maciej Gruza, Danuta Owczarek, Robert Kupiec, Kamila Gromczak, Jerzy Sładek
VIRTUAL CMM MODEL ADAPTED FOR USAGE IN INDUSTRIAL CONDITIONS

Due to the rigorous requirements for implementation of the virtual models of CMMs they are usually used in the renowned calibration laboratories. This paper presents the novel methodology of implementing the virtual CMM model that is capable of correct uncertainty determination for measurements done in less stable industrial conditions. The verification results were also presented under varying ambient conditions. They prove the correctness of proposed methodology.

Gianni Togliani
Virtual DMT: An Opportunity for Pile Design?

The DMT results are rarely used for piles design, probably because its diffusion and popularity are still limited although DMT is in use for a long time. Conversely CPTu are much more popular and often used to this purpose: this is the reason why a large concerned database is available where it is possible to get the CPTu/DMT conversion experienced in recent years. This was done for two well-documented cases [a bored pile in Santa Cruz (Bolivia) and a driven pipe pile in Sandpoint, (US)] with promising results.

Page 850 of 866 Results 8491 - 8500 of 8655