>> P.308
변동하중에대한평균하중리니어웨이·리니어롤러웨이에가해지는하중이변동할때는수명계산식의동등가하중P대신평균하중Pm을사용합니다.평균하중이란변동하는하중과동등한수명을부여하도록환산된하중으로,다음식을사용하여구합니다.여기서PmLPnp:평균하중N:총주행거리m:변동하중N:지수(볼타입:3,롤러타입:10/3)일반적인변동하중에대한평균하중의계산예가표7에나와있습니다.7표변동하중에대한평균하중예평균하중Pm=.................................................L(12)pPndL0L1p3-14(2Pmax+Pmin)Pmax:변동하중의최대값NPmin:변동하중의최소값N1—3Pm≒여기서PmaxPmLLP1P2PmPnLnL1L2Pm=p1L(P1pL1+P2pL2+…+PnpLn)여기서L1:하중P1을받아주행한총주행거리mL2:하중P2를받아주행한총주행거리mLn:하중Pn을받아주행한총주행거리m①단계적으로변화하는하중PP②단조롭게변화하는하중Pmi
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