It is important for pantographs on high speed trains that aeroacoustic noise is reduced and lift characteristics are stabilized. Because these two properties trade off each other, design of pantograph is a very delicate process to require wind tunnel tests over and over. This process takes a long time and requires a large amount of costs. Therefore, we attempted to design a two dimensional configration of panhead by a combination of CFD and optimization technique in order to satisfy an appropriate lift force and a low noise charactor. Optimization technique we used is a combination of Downhill Simplex method and the Simulated Annealing method. We conduced wind tunnel tests with two types of two-dimensional panheads designed by this technique. The results indicate that this technique is useful for panhead designing.

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