It has been established the bp artificial neural network model that five parameters such as the length of pile , the diameter of pile , the depth of pile embedding soil , weighted average of side resistance of friction , and bearing capacity of pile end are import cell , there is one middle layer , 2n + 1 artificial neural cells of middle layer , and one export layer that is single pile vertical bearing capacity 通过对影响桩基承载力因素的分析并结合bp神经网络的特点，建立了以桩长、桩径、桩入土深度、侧摩阻加权平均值、桩端承载力等参数为输入层神经元，中间层为1层，中间层的神经元为2n + 1个，输出层为1个(即单桩竖向承载力)的bp神经网络模型。
In the designing of priority for the transmission ratio , the usage of gear ' s attest on transmission ration should be considered ; the average value is set as the evolution aim of the loss of driving power and the useful effectiveness . a simplified fuel - consumed economically model is used to simulate the fuel consumption while the automobile is in motion 在变速器传动比优化设计中考虑档位使用率对变速器传动比的影响，采用驱动功率损失率和有效效率利用率的加权平均值作为评价指标，用参数样条函数模拟车速状态下的燃油消耗量，提出了按变速器传动比的使用率来确定汽车的加速和等速的比例，并将其作为实际工况来确定汽车的实际燃油消耗率。
