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This paper combines thermal-structure coupling technique and pattern search   optimization algorithm to establish an optimization system for the start-up   process of a turbine unit. Firstly, a finite element model for   thermal-structure coupling calculation is established to accurately analyze   the transient temperature field and thermal stress field, which can obtain   the thermal stress distribution during start-up process. Afterwards, a   program of optimization on rotor start-up process is exploited to improve the   time allocation in each operating stage of start-up process, which minimizes   the maximum equivalent stress of rotor. The maximum equivalent stress has   reduced 25.7% after the optimization, which reveals obvious effect

Optimization on start-up process of high-pressure rotor for large power steam turbine