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Technique Technique | Auto Motor unit forces
Technique Technique | Auto Motor unit forces
| Motor unit forces |
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| Written by Юрий РужинÑкий | |
| Wednesday, 02 April 2008 | |
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Transferred via translate.google.com
All human progress is unthinkable without a variety of mechanical devices, which in turn are driven by different engines (internal combustion engine, electrical, hydraulic, pneumatic, biological, etc.). To most it was possible to determine the individual properties of an engine is usually measured by several standard criteria: 1. Engine power on the shaft in kW (hp in the evaluation system is outdated and will soon be canceled standardization of the European Commission). 2. Engine torque on the shaft in N × m (the system of evaluation in kgf × m is obsolete and will soon be canceled). 3. Engine speed: Max, which develops maximum power, which develops its maximum torque. 4. SFC (g / kW × h) or a working substance (l / min). 5. CPA dvigatelya.6. Weight harakteristiki.V everyday life, tend to operate only the first indicator (in the conversations, the pages of publications). When and where specified torque characteristics, they practically no attention. I think it is extremely unfair and contrary to all common sense to the logical self. Take, for example, two very different class of car with petrol engines: a truck ZIL-130 and is very popular with nouveau riche car «Honda CR-V». If we compare the two engines in terms of simple minds, that they are the same as have the power to 150 hp But you can imagine that the rearranged c «Honda» ZiLa to 2 liters «zhuzhzhalka» potyanet 12 tons total weight? The absurdity of the situation there. It is impossible to evaluate the engine only on any one of its targets or need to withdraw the synthesis of a digital description of its main targets. I propose to design research to keep the old system to assess the main characteristics of the engine as the most fully meet the professional demands and needs for obscheupotrebimyh philistine bring a new unit - a unit of motor power (subject to other variations of names). For this engine speed at which develops the greatest power and most torque should be summed and divided in half (remove the arithmetical mean). Then, at the average speed of these new measurements to the power and torque (in European standards), to multiply their numbers and bring in the kilo (103) propulsion power. How it will look like in practice? And now let us re-evaluate the above-mentioned motors cars. Specifications Engine ZIL-130 Engine power, kW (hp) 111 (150) at 3,200 rpm Torque, N × m (kgf × m) 410 (41) at 2.000 rpm Average engine rpm 2.600 Power at 2,600 rpm, kW (hp) 88.8 (120) (80%) Engine torque at 2,600 rpm, N × m (kgf × m) 328 (32.8) (80%) Physical strength of the engine, DPT 29.1 Specifications Engine «Honda CR-V» Engine power, kW (hp) 111 (150) at 6,500 rpm Torque, N × m (kgf × m) 192 (19.2) at 4,000 rpm Average engine rpm 5.250 Power at 5,250 rpm, kW (hp) 88.8 (120) (80%) Torque dvigatelyapri 5,250 rpm, X N m (kgf × m) 154 (15.4) (80%) Physical strength of the engine, DPT 13.6 The data obtained by physical force of the engines (it was mutual underdeclaration indicative of the power and time to 80%) show their true strength and the possibility of setting on a vehicle. In doing so, if we take the contrast to the stationary or the ship malooborotisty diesel (or Stirling engine), the contrast of IMR will be more striking. Nevertheless, the new standard is very obvious and practical, allows you to really evaluate similar characteristics of engine. It should be noted that the new standard (DPT) does not show the degree of sophistication and quality of performance of an engine. This is really, as they say, a purely individual basis. / "TRAKTAT the reduction of entropy, t.II? Theme number 23 / |