Obviously, to choose shiftingtime accurately is a key to realize single machine test.
显而易见，正确地选择切换时机是实现单机测试的关键。
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In this paper, basing on the maneuvering mathematical model, we consider the influence of environments, then choose the optimum rudders shiftingtime by the use of optimum seeking method.
To compute the mean of many time shift values by shiftingtime window can help to eliminate the interference of random and other noises with surface factor, thus lineup statics may be obtained.