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Sökning: WAKA:kon > Persiska

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  • Delghandi, Sayed Hamed, et al. (författare)
  • Reliability analysis of the loading system of hydraulic excavator
  • 2014
  • Konferensbidrag (refereegranskat)abstract
    • Hydraulic excavators are widely used in mining and construction. They have an important role in mine loading cycle. These machines have three major parts: work equipment, upper structure and lower structure. The work equipment that is for digging and loading includes boom, arm and bucket. Because of the operation of the work equipment, it has got more failures in comparison with other parts. In this paper reliability modeling of work equipment according to the method of analytic solution of the proposed model has been made. After estimating of model parameters, system failure rate has been calculated and failure behavior is assessed. The reliability of work equipment system reduces to 80% after 30 hours of operation and it reach zero after about 360 hours. The failure rate increases at a decreasing rate and after 360 hours it will be at a rate of 0.021.
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  • Falahi, H., et al. (författare)
  • Exploring and regression analysis of forces applied on Gastrocnemius muscle of drivers during clutching of MF 285 and MF 399 tractors : Ergonomic design approach
  • 2013
  • Konferensbidrag (refereegranskat)abstract
    • In this research the imposed force on Gastrocnemius muscle of the tractor driver during clutching has been studied. The number of sample people was assigned 30 and the research was conducted on MF285 and MF399 tractors. The clutching forces for these tractors were measured as 340 N and 290 N, respectively. The angle of knee location in these two tractors at 5 percent level was significantly different. The average decrease of pain threshold after 30 seconds and 60 seconds clutching and 60 seconds rest after clutching in MF285 tractor in Gastrocnemius muscle were more than MF399 tractor. The impact of BMI index Regression coefficient was found the highest among at all intervals during and after the clutching on both tractor drivers on decrease of pain threshold. It is suggested that in order to decrease the imposed force of clutching for MF285 tractor required modifications is performed. In this regard the force transfer joint between pedal and the disc in the mechanism of clutching can be made of cast iron.Keywords: ergonomic, tractor, operator, muscle, Gastrocnemius
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