Fault diagnosis of reciprocating engine is a very difficult and popular problem.

发动机的故障诊断是较困难和热点的研究问题。

The crankshaft, regarded as the "backbone" of the engine, serves to change the reciprocating motion of the piston into rotary motion and handles the entire power output.

曲轴，也叫做发动机的“脊柱”，其作用是将活塞的上下往复运动转换成为旋转运动，并且控制着整个的功率输出。

However, diesel engine is a typical reciprocating machine, its monitoring and diagnosis are very difficult because of its complex structure.

柴油机是一种典型的往复式动力机械，结构复杂决定了对其进行状态监测与故障诊断的困难性。

The torsional vibration absorbers of reciprocating piston engine crankshafts are the earliest and most commonly used kind of damped dynamic vibration absorbers.

往复活塞式发动机曲轴扭振吸振器是应用得最早且最普通的一类阻尼式动力吸振器。

Reciprocating piston pump crankshaft by connecting rods connected with the original motivation. Prime mover can be motor, steam engine can also be used.

往复泵的活塞由连杆曲轴与原动机相连。原动机可用电机，亦可用蒸汽机。