Thermodynamic Processes in the Modelling of Dynamic Characteristics of Impact Tools

• Autorzy: Śledziński M.
• Konferencja: French-Polish Seminar of Mechanics (19 ; 8-11.06. 2011 ; Perpignan, France)
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

impact tools; pneumatic actuator; beater; thermodynamic processes; dynamic characteristics; soil compaction

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Machine Dynamics Research
• Rocznik: 2011
• Tom: Vol. 35, No. 2
• Strony: 80--88
• Opis fizyczny: Bibliogr. 6 poz., il.

Twórcy

autor

Śledziński M.

• Institute of Machine Design Fundamentals, Chair of Machine Design Fundamentals,

Bibliografia

• Cempel, C., 1989, Applied Vibro-Acoustics (original title in Polish: Wibroakustyka stosowana), PWN, Warszawa
• Dobry, M. W., 1982, The Dynamics and Effectiveness of Constant Reaction Force Vibration Isolators Used in Impact Tools (original title in Polish: Dynamika i skuteczność wibroizolatora o stałej sile oddziaływania zastosowanego do ręcznych narzędzi udarowych) PhD thesis, Politechnika Poznańska.
• Engel, Z., 1993, Environmental Protection Against Vibration and Noise (original title in Polish: Ochrona środowiska przed drganami i hałasem), PWN, Warszawa.
• Meler, F., Śledziński, M., 2005, Modelling of Vibration Isolators in Pneumatic Impact Tools for Soil Compacting (original title in Polish: Modelowanie wibroizolatorów udarowych narzędzi pneumatycznych do zagęszczania gruntu), 15th Conference on Methods and Tools of Computer Aided Design, Politechnika Warszawska.
• Śledziński, M., 2005, Formating of Design Features of Vibration Isolator in Pneumatic Rammer (original title in Polish: Kształtowanie cech konstrukcyjnych tłumika drgań ubijaka pneumatycznego), PhD thesis, Politechnika Poznańska, Wydział Maszyn Roboczych i Transportu.
• Woelke, S., 1997, Determining of Function of Air Flow for Real Nozzles (original title in Polish: Wyznaczanie funkcji wpływu powietrza dla dysz rzeczywistych), Hydraulika i Pneumatyka, 4, 4-6.