>> P.308
3-14변동하중에대한평균하중리니어웨이·리니어롤러웨이에가해지는하중이변동할때는수명계산식의동등가하중P대신평균하중Pm을사용합니다.평균하중이란변동하는하중과동등한수명을부여하도록환산된하중으로,다음식을사용하여구합니다.Pm=.................................................(12)여기서Pm:평균하중NL:총주행거리mPn:변동하중Np:지수(볼타입:3,롤러타입:10/3)일반적인변동하중에대한평균하중의계산예가표7에나와있습니다.PndLpLp0L1표7변동하중에대한평균하중예평균하중①단계적으로변화하는하중Pm=L(P1pL1+P2pL2+…+PnpLn)p1여기서L1:하중P1을받아주행한총주행거리mL2:하중P2를받아주행한총주행거리mLn:하중Pn을받아주행한총주행거리m②단조롭게변화하는하중Pm≒1—3(2Pmax+Pmin)여기서Pmax:변동하중의최대값NPmin:변동하중의최소값NLLnL2P2P1PPnPmL1LPPmPmiPmax
| < 
| 
> | 
>>
