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Comparative analysis of the instantaneous fuel consumption of a car with different type of power train system under transient conditions

Gołębiewski W., Prajwowski K.

Journal of KONES

2014

Vol. 21, No. 1

83--90

The aim of this study was to compare instantaneous fuel consumption of a FIAT Panda car with three types of propulsion system applied: engine positioned front-lengthwise to the direction of travel and rear-wheel drive, engine positioned front-transversely to the direction of travel and front - wheel drive and all-wheel drive. The vehicle was equipped with a 1.3 JTD MultiJet compression-ignition engine being used for conducting experimental tests. This part was based on making the load characteristics (relationship between specific fuel consumption and engine torque) using engine dynamometer. This was made for given parameters corresponding to specific traffic conditions. They were determined in a simulation and were represented by rolling resistance and air resistance. Their value was affected by vehicle technical and operating characteristics and its design features, such as maximum weight, transmission system ratios, dynamic wheel radius, drag coefficient, width and height, and efficiency of propulsion system. The efficiency of power train system was adopted from a simulation conducted for different types of propulsion system. Apart from basic resistance, additional drag (inertia resistance) was the most important in vehicle energy balance. It played an important role in determining the value of instantaneous fuel consumption for variable velocity and constant acceleration values used in the UDC test (Urban Driving Cycle – subtest of the EUDC cycle). The lowest fuel consumption for a given car velocity was for front-wheel drive transmission system, whereas the highest for allwheel drive system (4x4).

Drgania płyty zamocowanej na obwodzie obciążonej siłą skupioną poruszającą się ze zmienną prędkością

Ataman M.

Logistyka

2011

nr 6

W pracy przeanalizowano drgania prostokątnej płyty Kirchhoffa zamocowanej na obwodzie i spoczywającej na podłożu Winklera. Sprężysta płyta charakteryzuje się zmiennym poprzecznie modułem Younga. Obciążenie stanowi siła skupiona poruszająca się ruchem jednostajnie zmiennym, rownolegle do boku płyty. Zaprezentowane rozwiązania oraz przykłady obliczeniowe opisują drgania wymuszone oraz drgania swobodne płyty.

Vibrations of rectangular, clamped Kirchhoff’s plate resting on Winkler foundation are analysed in the paper. Vertical variation of Young’s modulus through the plate is considered. The supplementary modulus of elasticity is included into equation of motion. The plate is subjected to moving force. Velocity of load is variable. Forced and free vibrations of the plate are analysed. Solutions are illustrated by numerical examples.