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Jerzy Sładek, Grzegorz Sokal
THE CORRECTION OF THE MEASURING ACCURACY OF THE INDUSTRIAL ROBOT BY USING ARTIFICIAL NEURAL NETWORKS

Using industrial robots to the measurement tasks in the field of multicoordinate metrology is worth the interest. But it demands performing adaptation process, correcting the measuring accuracy if needed and determining the field of measuring tasks. During the adaptation process it is important to perform analysis of the accuracy of built measurement system. In the case of lack of accuracy it is indispensable to correct this values. The use of software methods like ANN (Artifical Neural Networks) seems to be expedient, because it is not the mechanical interference. The point of the described method is the determination of error in the given spaces. Then it is possible to built the accuracy model of whole robots space.

Mariolino De Cecco, Luca Baglivo, Enrico Ervas, Enrico Marcuzzi
ASYNCHRONOUS AND TIME-DELAYED SENSOR FUSION OF A LASER SCANNER NAVIGATION SYSTEM AND ODOMETRY

This paper presents a description of the ‘sensor fusion’ algorithm for our proprietary new navigation system, the LS_NAV, which is based on laser range scanning data inside natural environment. The fusion is exploited between odometric navigation and the LS_NAV. In the proposed algorithm the accuracy of both navigation systems is estimated as a function of the actual manoeuvre being carried out. The method allows compensating the drift of the incremental system estimation, high data rate and noise reduction of the LS_NAV estimates. Experimental verification is carried out using an autonomous vehicle.

Jaromír Volf, Josef Vlček
INVESTIGATION FOR TIMBER BARKING ROBOTIZED SYSTEM PERFORMANCE

The original Timber Barking Principle – Using Electrical Current Effects has been tested for an industry timber barking purposes. This untraditional timber barking - no wood loss - method demands the special measuring Stand By Post to be done – for the parameters identification and setting; to be realized the voltage control for the Timber Barking Model with Operational Dimensions. The other control way – acceptable for the logs with the low quality subcortical layers has been tested. The speed control tests of the feeding device has been done – to be improved the robotized system intelligent behaviour. The tests results and problems are given. To the successful Timber Barking - the specific energy range w [Ws/m²] has been caught.

Jaromír Volf, Josef Vlček, Tomáš Šemnický
THE PIEZOELECTRIC TACTILE SENSOR FOR STATIC FORCE MEASUREMENT

The new tactile sensors - based on piezoeffect – have been developed. Piezoceramics PZK 850 is used as the force – electrical signal converter. This sensor is able to measure static force to 50 N without charge amplifier using. Functional principles and sensors properties are described.

Andrzej Masłowski, Wojciech Ulatowski
MODELING OF SUPERVISOR’S ACTION MEASUREMENTS IN CONTROL OF MULTI-AGENTS MOBILE ROBOTIC SUBSYSTEM

The ways of modeling of supervisor’s action measurements in control of multi-agents mobile robotic subsystem using cognitive idea are discussed. The architecture of a transport subsystem, which can work efficiently both in the newest and existing manufacturing systems as well as rules for co-operation and coordination of vehicles have been presented. Computer simulation results are given.

Anil Agarwal, Claude Jacques
A SYSTEMATIC APPROACH TO ESTIMATING UNCERTAINTY IN PRESSURE MEASUREMENT

For any measurement to be meaningful, the result of the measurement must be accompanied with a statement of its uncertainty. The evaluation of uncertainties associated with pressure measurement is sometimes complex but an important task. This paper presents a systematic approach for estimating measurement uncertainty by providing a worked example for the case of pressure measurement by a pneumatic dead-weight tester.

Paulo R. G. Couto, Luiz Henrique Paraguassu, Leonardo Rodrigues Cinelli, Ilca Lopes.Bezerra, Isabela Wanderley Alves, Walmir Sérgio da Silva
VERIFICATION OF THE CONVERGENCE BETWEEN ISO GUM 95 vs MONTE CARLO METHOD REGARDING THE EXPANDAD UNCERTAINTY AT THE PRESSURE LABORATORY IN BRAZIL

This paper describes the way by which the National Pressure Laboratory in Brazil has been calculating its calibration measurement capabilities (CMC) using the uncertainty estimations contained in the ISO GUM 95 and declared in the appendix C of the BIPM, and verifying if there is any convergence and consistency between the measurements results calculate with both methods.

Felix Sharipov, Guilherme Bertoldo
NUMERICAL MODELLING OF PIRANI SENSOR

Numerical calculations of heat flux in the Pirani sens were carried out for a wide range of the gas rarefaction based on the kinetic Boltzmann equation. To take into account a non-diffuse gas-surface interaction the Cercignani-Lampis scattering kernel was used in the boundary condition. Such a kernel allowed us to study the influence of the momentum and energy accommodation coefficients on the heat transfer from the sensor wire into surrounding gas. The present results can be applied to improve the precision of pressure measurements by Pirani sensor.

Jorge C. Torres-Guzmán, Luis A. Santander-Romero, Luiz H. Paraguassú, Paulo R. G. Couto, Ilca L. Bezerra
SIM VACUUM COMPARISON FROM 13 Pa UP TO 1,33 kPa

This comparison constitutes the first vacuum comparison among National Metrology Institutes (NMI) within the Interamerican Metrology System (SIM). Each laboratory used its national standards. The Centro Nacional de Metrología (CENAM, Mexico) used a primary standard (static expansion system type) and the Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (INMETRO, Brazil) used a secondary standard (comparison system type). CENAM had the role of coordinator and pilot laboratory. The comparison started in December 2004 and finished in March 2005. The objective of the comparison was to estimate the level of agreement for the realization of the quantity and the uncertainty associated to its measurement.
One transducer (Capacitive Diaphragm Gauge) was used as transfer standard; the comparison range was selected from 13 Pa to 1,33 kPa. The relevant aspects of the measurement protocol are summarized in the paper but were widely developed in the comparison reference documents. The gas used for the comparison was nitrogen. The measurements started at the lowest pressure and the pressure was increased up to the maximum range. The analysis of measurements comparability between the laboratories is included here. This bilateral comparison has been entered within the SIM data base as a pilot comparison SIM.7.26 P.

SamYong Woo, InMook Choi
INVESTIGATION OF CHARACTERISTICS OF 133 Pa CDG USING PRESSURE BALANCE

The purpose of this paper is to investigate the characteristics of precise low-pressure gauges such as Capacitance Diaphragm Gauge (CDG) devices in the range 133 Pa using a commercial gas-operated pressure balance. Generally the pressure balance is not adequate to calibrate such low pressure gauges as the minimum pressure to balance the tare weight corresponds to a pressure of several kilopascals. However using a variable bell-jar pressure method can overcome this difficulty. To realize this method effectively, we developed a new weight-handling device that makes it possible to add or remove weights easily. This apparatus is very useful to find the characteristics of such low-pressure gauges. Moreover, one of the greatest benefits of this method is the traceability to link directly to the gas pressure standard that is easily traceable to the national standard.

Page 843 of 936 Results 8421 - 8430 of 9356