纵倾变化 meaning in Chinese

change of trim

Using a combination method of the lifting surface theory and acoustic technique , the effects of different diameters , skews and rakes on the discrete noise of the propeller are studied by the numerical method and some useful results for engineering are presented in this paper
利用升力面理论和声学方法得到的离散谱噪声的预报公式，对螺旋桨直径、侧斜、纵倾变化对离散谱噪声的影响作了数值计算，并得到了工程上有实用意义的结果。