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Assessment of the acoustic microclimate and rating of noise hazards in the inner transport system of a bucket wheel excavator: a case study

100%

Sokolski P. , Sokolska J.

2022

tom T. 17, z. 1

187--200

Noise and acoustic microclimate have an important influence on working conditions in industry. However, there are many sources of noise in machinery that create occupational hazards. In particular, these problems occur in belt conveyors, which are components of integrated continuous material handling systems. In large heavy-duty machines used for surface mining (bucket wheel, bucket chain excavators, and stackers), the most acoustically active areas are located in the zones of conveyor lines. For this reason, the present article presents the results of comprehensive research of noise in a transport system in a bucket wheel excavator operated in a surface mine. The most significant sources of noise were tested. Two analysis approaches (deterministic and probabilistic) were applied. Lower values of permissible exposure time were obtained using the latter method. This approach should be selected, as it takes into account the real conditions of operation of the tested object. The research and analysis showed that in real operating conditions of large working machines (multi-bucket wheeled excavators), the noise level cannot be treated in deterministic categories. This is due (among other factors) to the fact that the working loads are randomly variable in various operating conditions, which also causes the nature of noise in the area of these machines and their surroundings to change randomly. For this reason, the acoustic climate and the assessment of the level of noise hazards in such machines should be analyzed by taking into account the random nature of noise.

Aspekty europejskiej normalizacji metod nieniszczących w badaniach eksploatacyjnych maszyn roboczych

86%

Dudek K. , Przystupa F. W. , Sozański L.

2002

tom Z. 19

109-115

W pracy analizowano możliwości wykorzystania norm europejskich z zakresu badań nieniszczących w kontroli eksploatacyjnej maszyn roboczych. Omówiono obowiązujące zasady kwalifikacji personelu wykonującego badania. Nawiązano szerzej do normalizacji kontroli ultradźwiękowej i magnetyczno-proszkowej jako metod podstawowych w badaniach eksploatacyjnych oraz wspomniano o projekcie normy pomiaru grubości metodą ultradźwiękową. Podano przykład istotnych elementów procedury wykonania nieznormalizowanych badań termodiagnostycznych w podczerwieni. Przedstawiono korzyści stosowania w procedurach pomiarowych elementów norm europejskich.

The paper presents application analysis of the European standards for the heavy-duty machinery exploitation research by the non-destructive methods. The obligatory methods for the research staff qualification were shown. The description was concerned on the ultrasonic and the magnetic powder inspection standardization as the basic methods in the exploitation research. The thickness ultrasonic measurement standard project was described. The main examples of the non-standardized procedure of the infrared thermography diagnosis were shown. The effectiveness of the European standards application in the machinery inspection was presented.