A general method to calculate passive earth pressure on rigid retaining wall for all displacement modes

A general analytical method to calculate the passive rigid retaining wall pressure was deduced considering all displacement modes. First, the general displacement mode function was setup, then the hypotheses were made that the lateral passive pressure is linear to the corresponding horizontal displacement and the soil behind retaining wall is composed of a set of springs and ideal rigid plasticity body, the general analytical method was proposed to calculate the passive rigid retaining wall pressure based on Coulomb theory. The analytical results show that the resultant forces of the passive earth pressure are equal to those of Coulomb＇s theory, but the distribution of the passive pressure and the position of the resultant force depend on the passive displacement mode parameter, and the former is a parabolic function of the soil depth. The analytical results are also in good agreement with the experimental ones.

48V BSG电机对整车加速噪声的影响

介绍了某带48V P0 BSG电机的汽车动力系统结构和工作模式,针对不同挡位模式和不同油门开度下加速噪声的不同表现,测试动力总成噪声声功率级、BSG近场噪声、车内噪声、发动机转速和BSG电机电流等工作参数进行评价。结果表明:BSG电机在起步和换挡时的助力程度不同,不同油门加速下,BSG电机助力程度也不同,加速过程中BSG电机助力引起动力总成和车内噪声的主阶次噪声变大。