GROUND VEHICLES CONFORMITY ASSESSMENT: METROLOGICAL ANALYSIS AND MODERNIZATION OF A SYSTEM TO MEASUREMENT VELOCITY / AVALIAÇÃO DA CONFORMIDADE DE VEÍCULOS TERRESTRES: ANÁLISE METROLÓGICA E MODERNIZAÇÃO DE UM SISTEMA PARA MEDIÇÃO DE VELOCIDADE

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

Experimental analysis is very important to know the characteristics of any product. The tests results can be used in researches or be compared with default values. In the second case it is necessary follow certain procedures that are described in standards and to compare the value of product`s characteristics with the standard`s requirements. Within the Basic Industrial Technology Domain, this activity is commonly designated as conformity assessment. But to measure these characteristics is necessary to use instruments. The instrumentation is the most important part in this process because if inadequate instruments are used, the result of the measurement will be incorrect and the errors may be great. Then it is necessary that the instruments had been correctly calibrated and have an adequate good accuracy, low uncertainty and ensure the repeatability and reproducibility of the measurements. Metrology is the science dealing with metrology reliability. In automotive tests happen the same, however it is necessary knowledge about vehicular dynamic too, to know how and what will be measured. The Brazilian Army Marambaia Proving Ground has an equipment used to vehicles evaluation that measure speed and distance using a non-contact optical sensor and a data acquisition system. This masters degree dissertation proposes an alternative for this equipment`s Central Processing Unit substituting it for a laptop with a data acquisition board and a specific software with data processing tools to process the same non-contact optical sensor`s signals. However this is not enough, it`s necessary a metrological approach of the data acquisition system to ensure the uncertainty of measurement and avoid false accept risk and false reject risk. In the context of the developed metrological approach, both the measurement systems were evaluated, the system originally in use and the alternative system proposed that will substitute the first. The knowledge about the associated uncertainties constitute a strategic resource to the important stage of the used equipment`s calibration. To carry through this work it was necessary to join three areas: vehicular dynamic, instrumentation and metrology.

ASSUNTO(S)

avaliacao da conformidade ensaios veiculares metrology veiculos terrestres metrologia conformity assessment automotive tests ground vehicles

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