用蒸汽驱动的动力铲。
当动力铲带着铲起的东西转回来时，示范的人说，“你瞧是不是，多么容易。”
There you are - like a knife through butter, 'said the demonstrator as the powered shovel swung back with its load.
依据振动掘削的动力学特征和振动机理，建立铲斗-土壤的单自由度模型。
The single degree of freedom model of bucket-soil was established according to the dynamic characters and vibratory mechanism.
首先根据动力学知识分析影响铲斗重量的所有变量，依据这些变量的特征和范围选择合适的传感器来进行测量。
All variables that may influence the shovel weight are analyzed by dynamic knowledge and suitable sensors are selected for measuring them according to their characteristics and scope.
在对反铲液压挖掘机工作装置的运动学、动力学性能以及挖掘力数学模型全面分析的基础上，建立了反铲液压挖掘机整机的位置模型和挖掘力发挥模型。
Models of the position and tool forces of backhoe hydraulic excavator were built based on the full analysis of kinematics, kinetic performance of working device and mathematic model of tool forces.
在对反铲液压挖掘机工作装置的运动学、动力学性能以及挖掘力数学模型全面分析的基础上，建立了反铲液压挖掘机整机的位置模型和挖掘力发挥模型。
Models of the position and tool forces of backhoe hydraulic excavator were built based on the full analysis of kinematics, kinetic performance of working device and mathematic model of tool forces.
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