纵向耦合振动是大型液体火箭的结构与推进系统相互作用而产生的不稳定振动。其特征频率是由结构纵向振动与推进剂输送管路振动的固有频率彼此接近或相等时所产生的一个闭合回路的共振频率，它的幅值开始于动力飞行过程中的某瞬间,随后达到最大,最后减弱。
本文研究了高速柴油机轴系的扭转—纵向耦合振动的机理和计算方法。
This paper studied the principle and method of calculation for the coupled torsional axial vibration of the crankshaft for a high speed vehicle diesel engine.
本文提出了一种具有非线性刚度的弹簧一质量模型，用于计算内燃机轴系的扭转—纵向耦合振动。
This paper presents a new mathematical model for calculating the coupled torsional-axial vibration with non-linear stiffness for a lumped spring-mass shaft system of internal combustion engine.
特别是发现了耦合振动中横向和纵向振型相互转化的物理现象。
Especially, a physical phenomenon is found that transverse vibration mode shapes and longitudinal vibration mode shapes can transform mutually.
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