pitching velocity meaning in English

俯仰变化速度
纵摇速度

Secondly , the non - linear model of ship motion was studied . the non - linear term and the term related to pitching velocity are referred to disturbance of the system to get state feedback designed mathematic model of the rudder / fin joint control system . the non - linear rudder / fin joint control system - designing problem was transformed into disturbance attenuation linear system designing problem , which uses quadratic performance as object function
为了得到船舶舵鳍联合控制系统的状态反馈h ~设计的数学模型，把非线性项及与横荡速度相关的项也看作是对系统的扰动，把非线性船舶舵鳍联合控制系统设计问题化为以二次型性能指标为目标函数的干扰抑制的h ~线性系统设计问题。