对气阀和活塞组件分别从热力学和振动分析角度给出了合理的故障机理分析；
Secondly, the fault mechanisms of valves and piston subassemblies are analyzed from thermodynamics and vibration methods.
文章从动力学中固液耦合振动的角度出发，研究了油管柱内流体不稳定流动引起的油管柱振动问题。
A problem about tubing string vibration caused by the fluid unsteady flow inside tubing string is studied from the Angle of solid liquid coupling vibration in dynamics.
通过跟踪试验，从振动和磨损的角度，研究了曲轴飞轮组的平衡对发动机工作的影响。
The effect of unbalance weight of the crankshaft-flywheel on the engine's operation was studied from the view of shaking and wearing by means of tracing test.
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