Effect of calibration data series length on performance and optimal parameters of hydrological model

In order to assess the effects of calibration data series length on the performance and optimal parameter values of a hydrological model in ungauged or data-limited catchments （data are non-continuous and fragmental in some catchments）, we used non-continuous calibration periods for more independent streamflow data for SIMHYD （simple hydrology） model calibration. Nash-Sutcliffe efficiency and percentage water balance error were used as performance measures. The particle swarm optimization （PSO） method was used to calibrate the rainfall-runoff models. Different lengths of data series ranging from one year to ten years, randomly sampled, were used to study the impact of calibration data series length. Fifty-five relatively unimpaired catchments located all over Australia with daily precipitation, potential evapotranspiration, and streamflow data were tested to obtain more general conclusions. The results show that longer calibration data series do not necessarily result in better model performance. In general, eight years of data are sufficient to obtain steady estimates of model performance and parameters for the SIMHYD model. It is also shown that most humid catchments require fewer calibration data to obtain a good performance and stable parameter values. The model performs better in humid and semi-humid catchments than in arid catchments. Our results may have useful and interesting implications for the efficiency of using limited observation data for hydrological model calibration in different climates.

油膜轴承承载性能分析及参数优化

给出了油膜轴承的设计条件, 以油膜轴承最大承载能力与良好的工作状态作为目标函数, 按承载量最大、发热量最小、摩擦系数最小、轴承长径比最小的分目标函数, 根据各分目标函数在总的目标函数中的分量, 采用线性加权和的形式构成综合目标函数, 对其进行优化, 并利用实际设计例子进行了验证, 得到满意的效果。同时提出了宽径比系列化的设计思想, 可简化设计过程和降低生产成本。