@astra nos - varianta demo e mai limitata, dar rezultatele sunt la aceleasi. gasesti pe DC versiunea full. pt simuari mai complexe se poate folosi matlab cu simulink. il gasiti pe DC si usenet.
sandumbogdan a scris:Cuplu = forta, putere = acceleratie.
mai isaac, ce te faci cu legea a 2a?...inseamna ca forta/"putere"= masa
?! ... deci nonsens. stai mai bine pasiv si citeste ce se posteaza, daca la fizica ai chiulit.
si ca sa te conving ca nu ai deloc dreptate, uite aici graficul pt motorul tau. (cel albastru e real, rosu e tunat)
esti deacord cu mine ca pana la 1500 rpm abia iti accelereaza si de la 1600 pana la 3000 te baga in scaun? asta se intampla exact atunci cand nu prea ai "putere"- acceleratie cum o numesti tu, adica e cam jumate din acel maxim (75cai). fa un test, urca la 4000 rpm, cand ai "putere" maxima, si incerca sa pleci de pe loc. ai sa vezi ca iti pleaca mai greu decat la 1500, si atunci o sa imi dai dreptate.
First of all, from a driver's perspective, torque, to use the vernacular, RULES . Any given car, in any given gear, will accelerate at a rate that *exactly* matches its torque curve (allowing for increased air and rolling resistance as speeds climb). Another way of saying this is that a car will accelerate hardest at its torque peak in any given gear, and will not accelerate as hard below that peak, or above it. Torque is the only thing that a driver feels, and horsepower is just sort of an esoteric measurement in that context. 300 foot pounds of torque will accelerate you just as hard at 2000 rpm as it would if you were making that torque at 4000 rpm in the same gear, yet, per the formula, the horsepower would be *double* at 4000 rpm. Therefore, horsepower isn't particularly meaningful from a driver's perspective, and the two numbers only get friendly at 5252 rpm, where horsepower and torque always come out the same.
In contrast to a torque curve (and the matching pushback into your seat), horsepower rises rapidly with rpm, especially when torque values are also climbing. Horsepower will continue to climb, however, until well past the torque peak, and will continue to rise as engine speed climbs, until the torque curve really begins to plummet, faster than engine rpm is rising. However, as I said, horsepower has nothing to do with what a driver *feels*.
http://vettenet.org/torquehp.html
Slick a scris:
Deci practic acceleratia (masinii) este direct proportionala cu cuplu * turatia ??
mda....si nu. acceleratia este functie de timp. deci depinde in ce interval de timp te folosesti de forta dezvoltata de catre cuplu. poti sa alegi sa folosesti toata plaja de rpm, intr'un timp scurt rezultand o acceleratie mare, sau intr'un timp lung, cu o acceleratie aproape de 0 m/s2. pt intervalul de timp cel mai scurt, adica acceleratia maxima, devine importanta forma graficului care descrie momentul/cuplul, si nu asa mult valoarea maxima, pt ca accelerand, nu vei sta la un rpm fix. diferenta asta este intre benzina si diesel, modul in care valorile cupului sunt distribuite pe axa rpm si de aici ai acceleratii diferite la valori rpm identice. asta este exact ce a zis si 4est.
4Est a scris:Cuplu fizic tine de greutatea si cursa cilindrilor.
clar ca tine de cursa pistoanelor (nu cilindrilor
), dar de masa lor mai putin. raportul de compresie si de dilatare a gazelor in procesul de ardere creaza forta, care X bratul ( jumatate din cursa) rezulta in moment/cuplu.
hint:
http://www.google.com/searc...tnG=Google+Search
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