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    Effect of lapping process on axis misalignment and surface roughness in elliptical gear pairs
    (Elsevier Sci Ltd, 2024) Pazarkaya, Ibrahim; Yazar, Mehmet; Karabulut, Sener; Uzun, Gultekin; Ozdemir, Ahmet
    This study aims to investigate the effect of application of the lapping process on the amount of axis misalignment in elliptical spur gears. Using a Taguchi L9 experimental design, nine distinct pairs of elliptical spur gears were manufactured, each featuring three distinct modules (m), number of teeth (z), and ratio of major and minor radius of the pitch ellipse (a/b). Specialized hardware and software were developed to determine inter-axis misalignment in the gear pairs. The hardware measured the misalignment, while the software collected data from a digital indicator, recording changes in inter-axis alignment at different angular positions of the gear pairs. Three diverse parameters were utilized in the lapping processes: rotational speed of 120 rpm, 170 rpm, and 220 rpm; duration of 10 min, 20 min, and 30 min; and mass of 0.5 kg, 1 kg, and 1.5 kg. Axial misalignment of the gear pairs was evaluated both before and after the lapping process. The most significant change in misalignment was observed at 76 mm for gear pairs with parameters m = 2.0, z = 25, a/b = 1.60, while the smallest misalignment change was recorded at 5 mm for gear pairs with parameters a/b = 1.60, m = 1.60, z = 40. After lapping process, the average surface roughness values of all gear pairs improved by an average of 27.64%, and no significant weight loss was noted. The optimal lapping parameters were determined based on post-lapping average surface roughness values, and they were found to be 220 rpm, 10 min, and a 1 kg weight. Although the rotational speed and duration varied, it was observed that a constant 1 kg weight parameter was the optimal lapping weight for all gear modules.
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    EFFECTS OF CONTROL FACTORS ON OPERATING TEMPERATURES OF A MECHANICAL HEAT PUMP IN WASTE HEAT RECOVERY: Evaluation Using the Taguchi Method
    (Vinca Inst Nuclear Sci, 2018) Motorcu, Ali Rıza; Coskun, Salih; Karabulut, Sener
    In the present study, the operating temperatures of the mechanical heat pump in waste heat recovery were investigated to elucidate the effect of control parameters such as compressor speed, wastewater temperature and mass flow rate. The experimental trials were performed using the Taguchi L27 full factorial orthogonal array, and the results were optimized for compressor suction gas temperature, compressor discharge gas temperature, temperature difference of water entering and leaving the evaporator, temperature difference of water entering and leaving the condenser, evaporation temperature, and condensation temperature. Analysis of variance was conducted to determine the effect of the control factors on the operating temperatures of mechanical heat pump. The analysis results show that the wastewater temperature was the most significant factor on compressor suction gas temperature and discharge gas temperature. The compressor speed has shown a meaningful effect on the temperature difference of water entering and leaving from condenser. The nominal levels of control factors and the optimal temperatures were specified for the studied experimental parameters. Prediction models were developed for the operating temperatures through the Taguchi method and the operating temperatures were predicted with a mean squared error less than 12%.