length-to-diameter ratio meaning in English

长度直径比
长径比

Screw length - to - diameter ratio
螺杆长径比
The threshold speed and the typical characteristics of the oil whip of the system are simulated under the nonlinear model of oil film force , and the state of motion and type of the bifurcation are analyzed by floquet multiplicators which is computed by the shooting method . secondly , the the nonlinear dynamical model of the low - pressure rotor - bearing system by column bearing with reduced dimensions is presented . the numerical results show the rule of the amplitude with the eccentricity of rotor , the length - to - diameter ratio , oil viscosity and the clearance - to - radius ratio of the bearing under the definite speed
其次,对降维后的低压转子?轴承系统的非线性动力学方程,计算了圆柱瓦轴承支撑的转子系统的振动稳定性在固定转速下随偏心距、轴承长径比、润滑油动力粘度和轴承间隙比的变化规律,并分析了转子前轴承轴颈的失稳转速与转子偏心距、轴承长径比、润滑油动力粘度和轴承间隙比之间的关系,同时利用floquet理论分析其运动状态和分岔类型。