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Thermodynamic Processes in the Modelling of Dynamic Characteristics of Impact Tools

Śledziński M.

Machine Dynamics Research

2011

Vol. 35, No. 2

80-88

The article describes thermodynamic processes occurring in the pneumatic actuator of the impact tool for soil compaction. The variability of kinematic and thermodynamic parameters was analysed for separate working cycle phases of the tool. The dynamics of changes in the quantities describing the tool's dynamic characteristics, i.e. Displacement and speed of the piston and air pressure in the actuator's working chambers were experimentally determined. A mathematical model describing dynamic characteristics of the impact tool, including the variability of thermodynamic processes occurring during the filling and emptying of the pneumatic actuator chambers was worked out. The result of consideration of the filling and emptying phases for the space above and below the piston as well as of the gas compression and decompression processes for the beater's working and return motions is a model description of thermodynamic processes. The results of the analyses are presented in charts describing the displacement of the beater and the tool's body during soil compacting. The paper also contains dynamics of pressure variability for the actuator chambers. The modelling of dynamic characteristics with thermodynamic processes taken into account is an effective tool for the designer of pneumatic impact tools.