In this study, a quasi-realistic thermodynamic analysis was performed to investigate the effects of design and operating parameters on the performance of a single-cylinder modern Atkinson cycle engine. Fortran was used for all calculations. It was assumed that the fuel-air mixture was used as the working fluid, and iso-octane was used as the fuel. The Wiebe function was used for the combustion process and it was assumed that the specific heat of the working fluid varies with temperature. In the calculations, heat transfer loss, combustion efficiency, mechanical friction, and pumping losses were taken into account. In the analysis, the closing of the intake valve, equivalence ratio, geometric compression ratio, and the initial conditions of the intake proses were used as independent variables. The effects of these variables on brake mean effective pressure, effective power, specific fuel consumption, and thermal efficiency were investigated. Increasing the inlet pressure, increasing the geometric compression ratio, and delaying the closing of the intake valve increased the mean effective pressure, thermal efficiency, engine output power, and torque. The increase in the inlet temperature adversely affected the engine performance and the specific fuel consumption increased. Engine performance parameters worsened when the equivalence ratio fell below 0.8 and rose above 0.9.
Bu çalışmada elektrikli bir taşıtın güç aktarma sisteminde kullanılacak tek vitesli dişli kutusunun tasarımı ve mukavemet kontrolleri yapılmıştır. Dişli kutusunun tahriki elektrik motoru tarafından sağlandığından motorun tork-devir karakteristiği referans alınarak mukavemet hesapları yapılmıştır. Dişli çiftlerin çalışması esnasında en sık karşılaşılan sorun olan aşırı gerilmeden kaynaklı kök kırılmalarının oluşmaması için gerilmeler KISSsoft yazılımı ile analiz edilerek optimizasyon yapılmıştır. Analizlerde diş yanak mukavemeti ve diş dibi gerilmeleri üzerinde durulmuştur. Geometrik parametreler ISO 6336 “Düz ve helisel dişlilerin yük kapasitesinin hesaplanması” standardında belirtilen emniyet katsayıları dikkate alınarak çözümler yapılmış ve dişli mukavemeti üzerindeki etkileri gözlemlenmiştir. Sonuçlar, birinci dişli çiftinin 2,5 mm modül, 22° helis açısı ve pinyon dişli çark için 32 diş sayısının optimal olduğunu göstermektedir. İkinci dişli çiftinin optimum parametreleri ise 2,5 mm modül, 20° helis açısı ve 33 diş sayısına sahip pinyon dişli olarak belirlenmiştir.
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