瞬时转动 meaning in Chinese

i tantaneous rotation
instantaneous rotation

What is the instantaneous center of revolution ?
瞬时转动中心在哪里？
Couple of instantaneous rotations
瞬时转动偶
The effect of uneven power and compression condition of each cylinder of diesel engine on the crankshaft instantaneous rotation ( velocity and acceleration ) curves and their interrelationship in different cylinder numbers and rotation speeds have been thoroughly analyzed by means of the crankshaft instantaneous rotation curves simulated by computer
本文通过计算机模拟出多缸内燃机各种作功和压缩状况下的曲轴瞬时转动曲线(速度和角加速度) ，详细分析在不同缸数和不同转速条件下，柴油机各缸作功和压缩功不均衡对曲轴瞬时转动曲线的影响及其内在联系。