The modified formula for the boom of large complicated bucket wheel excavator has been put forward under earthquake, included the local dynamic effect.
对大型斗轮挖掘机臂架，通过考虑局部动力效应，推导了在地震荷载作用下结构单元的修正公式。
2
Analysed the influence factors on single-bucket annual production capability, put forward the method of reasonable determine the piece rate wages quota for the excavator operater.
分析了影响挖掘机年生产能力的因素，提出了合理确定挖掘机计件工资定额的方法。
3
A new method of calculating the weight and center of gravity of boom of excavator is put forward, which has accurate and reliable result.