Yazar "Sabanci, Alaettin" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • [ X ]
    Öğe
    Effects of different tire configurations on tractor performance
    (Turkiye Klinikleri Journal of Medical Sciences, 2005) Sümer, Sarp Korkut; Sabanci, Alaettin
    The effects of tire ply constructions (radial and bias) and tire arrangements (singles and duals on rear the axle) on tractor performance were evaluated for 2 gear levels on 2 different fields covered with wheat stubble and having different soil types, clay and sandy-loam. For this purpose, the tractor's overall efficiency, specific fuel consumption, and slip values were determined using parameters measured in the study. The results showed that the use of radial tires provided some advantages. For example, overall tractor efficiency with radial tires instead of bias tires increased by 3.44%, while specific fuel consumption decreased by 3.08% on average. When operating with dual tires instead of single tires, overall efficiency increased by 14.73%, while specific fuel consumption decreased by 12.77% on average. Radial-ply tires did not provide a considerable reduction (6.7% on average) in terms of slip compared to bias-ply tires, while the use of duals reduced the slip by 34% on average. Variance analysis was performed and evaluated to determine the statistical significance of effects on the performance of the factors and their interactions. According to the statistical results, the best results were obtained with radial tires in dual configuration. © TÜBİTAK.
  • [ X ]
    Öğe
    Noise exposed of the operators of combine harvesters with and without a cab
    (Elsevier Sci Ltd, 2006) Sumer, Sarp Korkut; Say, Sait M.; Ege, Fikri; Sabanci, Alaettin
    A considerable number of the combine harvesters in Turkey are rather old and used without cabs resulting in unhealthy working conditions for their operators. Noise is one of the detrimental factors. This study deals with determining and comparing the noise exposed on the operators of the combines with and without a cab used for wheat harvesting in Turkey. The sound pressure levels (dB) at octave band center frequencies (31.5-8000 Hz) and the sound levels (dBA) at the ear level of the operators were measured on 37 different combine harvesters with four different makes and different years from 1976 to 2001. Fifteen of the combines were without a cab, another 15 had original cabs while remaining seven combines had cabs mounted on them after manufacturing. The sound pressure levels were in a decreasing trend from the lower frequencies to higher frequencies. This trend was more noticeable for the combines with original cab and with the cab mounted after manufacturing compared to the ones without cab. The use of a cab was more effective in the insulation of the noise at the medium and higher frequencies, which have more bothersome effect compared to the lower frequencies. The sound pressure levels were 75-102 dB and 46-89 dB at low (31.5-500 Hz) and high (500-8000 Hz) frequencies for all combines, respectively. The sound pressure levels at the frequency of 400OHz at which the human ear is most sensitive were 6-17 dB lower for the combines with the cabs mounted after manufacturing and 9-28 dB lower for the ones with the original cabs compared to the combines without cab. The sound levels were 85-90, 81-83, and 76-81 dBA for the combines without cab, with cab mounted after manufacturing, and with original cab, respectively. The study showed that the use of a cab was useful in the insulation of the noise, particularly at higher frequencies. In addition, it protects the operator from the factors having detrimental effects on the working efficiency such as high temperature and dusty environment. The authors strongly recommend mounting of a cab on to the combines currently being used without a cab in rental system in Turkey to provide healthy working conditions for their operators. (c) 2006 Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    Performance comparisions of tractor tire configurations on concrete surface
    (Farm Machinery Industrial Research Corp, 2008) Sumer, Sarp Korkut; Sabanci, Alaettin
    Effects of tire ply construction (radial and bias-ply) and tire arrangement (singles and duals on the rear axle) on the performance of a medium-powered tractor were evaluated on a concrete surface for three gear levels. Performance evaluations were identified in terms of maximum drawbar pull, maximum drawbar power, overall tractor efficiency, and specific fuel consumption. The use of radial tires provided a small advantages on the evaluation criteria compared to the bias tire. The use of dual tires instead of single tires and the increase of ground speed provided considerable advantages with respect to the evaluation criteria, particularly on the maximum drawbar power. The best results in this study were obtained with radial tires and dual configuration at the highest speed level used in the study. In this configuration, the maximum drawbar power and overall tractor efficiency increased by about 12 % and 4 %, respectively, while specific fuel consumption decreased by about 4 %.