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166 Florin Popa et al. Fig. 8 – Variation of stability parameter with main gear ratio change obtained by simulating MATCEL-PROP for propulsion engine power of 64 kW. Fig. 9 – Variation of stability parameter obtained by simulating MATCEL-PROP for changing wheel diameter. Fig. 10 – Variation of stability parameter with main gear ratio change obtained by simulating MATCEL-PROP for propulsion engine power of 74 kW. Fig. 11 – Variation of stability parameter with main gear ratio change obtained by simulating MATCEL-PROP for propulsion engine power of 54 kW.
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 167 On the other hand, the evolution of specific fuel consumption values for different states of the propulsion system is highlighted in Fig. 12. It can thus be noted that increased stability during operation of the propulsion system, values of these inputs are reduced, which is very advantageous. effective specific fuel consumption, ce [g/kWh] 190 185 180 175 170 165 160 155 unstable operation stable operation very stable operation Fig. 12 – Evolution of effective specific fuel consumption values for different states of the propulsion system. Using the Fig. 13 a,b,c shown the variation of these inputs for the three states of the system, and that each state consumption values are very close together, being practically constant regardless of equipment and characteristics of propulsion system that obtains the condition of its. 173 180 160 140 120 100 80 60 40 20 171.16 0 173 a. 166.2 186.4 200 180 160 140 120 100 80 60 40 20 183.9 0 186.4 161.1 181.5 180162 160 140 120 100 80 60 40 20 0 c. Fig. 13 – The range of values of effective specific fuel consumption correspon<strong>din</strong>g of the three states of propulsion system. b. 161
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BULETINUL INSTITUTULUI POLITEHNIC D
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VICTOR COTOROS şi EMIL BUDESCU, As
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