Beijing Key Laboratory of Urban Oil and Gas Distribution Technology,China University of Petroleum(Beijing), Beijing 102249, China;
Beijing Key Laboratory of Urban Oil and Gas Distribution Technology,China University of Petroleum(Beijing), Beijing 102249, China;
Beijing Key Laboratory of Urban Oil and Gas Distribution Technology,China University of Petroleum(Beijing), Beijing 102249, China;
Beijing Key Laboratory of Urban Oil and Gas Distribution Technology,China University of Petroleum(Beijing), Beijing 102249, China;
universal generating function (UGF); Monte Carlo method; series-parallel multi-state systems;