Modelling of vibration with absorber

• Autorzy: Vondřich J. , Thöndel E. , Jirku S.
• Języki publikacji: EN

Abstrakty

EN

Machine vibration occurs as a result of unbalanced revolving masses, loading forces and moments, starting and coasting of driving motors and other effects. We try to eliminate these undesirable vibrations by suitable mounting of the mechanical system. Another possibility of suppression of the vibration machine is to use an absorber. A model of a vibration mechanical system with a vibration absorber is presented in the paper. The model consists of a fixed-end vibrating beam with primary vibrating mass M and with stiffness K and damping B. The harmonic force F with frequency ? and amplitude A acts on the primary mass M as well as on the beam with stiffness k and damping b, where the secondary mass m of the absorber is mounted. The task of the absorber is to minimize the movement of the mass M. A model (Fig. 1) has two degrees of freedom X and x. Two equations describe the movement of the primary mass M and the secondary mass m of the absorber. The model is solved first numerically by using Simulink. In numerical solution it is possible to set up parameters of the mechanical system with respect to the vibration reduction. According to the mechanical requirements for the mechanical system (output trajectory, velocity, forces and torques acting on the individual parts of the system), it is also possible to design input parameters (driving torques and other parameters of the mechanical system). A experimental model will be designed in order to verify results, where a voice-coil will be used as the actuator of the force F Numerical and experimental model allows changing parameters i.e. masses M and m, length L and l of the beams and frequency ? of the excitation force F. The results from the numerical solution are then possible to compare with the measured values of the experimental model. It is assumed that the experimental model will be equipped with accelerometers enabling the measuring of vibration, which will be placed on the masses M and m.

Słowa kluczowe

EN

numerical modelling; Simulink; vibration; machine; absorber

• Wydawca: Wydawnictwo Wrocławskiej Rady FSNT NOT
• Czasopismo: Journal of Machine Engineering
• Rocznik: 2010
• Tom: Vol. 10, No. 4
• Strony: 100--105
• Opis fizyczny: Bibliogr. 5 poz., tab., rys.

Twórcy

autor

Vondřich J.

• Czech Technical University in Prague, Faculty of Electrical Engineering, Department of Electric drives and Traction, Technická 2,166 27 Prague 6, Czech republic

autor

Thöndel E.

• Czech Technical University in Prague, Faculty of Electrical Engineering, Department of Electric drives and Traction, Technická 2,166 27 Prague 6, Czech republic

autor

Jirku S.

• Czech Technical University in Prague, Faculty of Electrical Engineering, Department of Electric drives and Traction, Technická 2,166 27 Prague 6, Czech republic

Bibliografia

• [1] KIELB R. E., GAVIN H. P., DILLENBECK C. J., 2005, Tuned Vibration Absorbers. Duke University.
• [2] KOČÁRNÍK P., 2008, Modular Construction of Dynamical Systems. Functional model, Faculty of Electrical Engineering, Czech technical University in Prague.
• [3] HAVLÍČEK R., 2009, Shift Axis of Machine Tool model. Functional model, Faculty of Electrical Engineering, Czech Technical University in Prague.
• [4] Transmotec, http://www.transmotec.cz
• [5] MEMS-Micro--Electro-Mechanical Systems, www.st.com/mems.