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Marek A. Galewski - One of the best experts on this subject based on the ideXlab platform.

  • Optimal spindle speed determination for Vibration reduction during ball-end milling of flexible details
    International Journal of Machine Tools and Manufacture, 2015
    Co-Authors: Krzysztof J. Kalinski, Marek A. Galewski
    Abstract:

    In the paper a method of optimal spindle speed determination for Vibration reduction during ball-end milling of flexible details is proposed. In order to Reduce Vibration level, an original procedure of the spindle speed optimisation, based on the Liao-Young criterion [1], is suggested. As the result, an optimal, constant spindle speed value is determined. For this purpose, non-stationary computational model of machining process is defined. As a result of modelling, a hybrid system is described. This model consists of following subsystems, i.e. stationary model of one-side-supported flexible workpiece (modal subsystem), non-stationary discrete model of ball-end mill (structural subsystem) and conventional contact point between tool and workpiece (connective subsystem). The method requires identification of some natural frequencies of stationary modal subsystem. To determine them, appropriate modal experiments have to be performed on the machine tool, just before machining. Examples of Vibration surveillance during cutting process on two high speed milling machines Mikron VCP 600 and Alcera Gambin 120CR are illustrated.

  • Vibration surveillance supported by hardware in the loop simulation in milling flexible workpieces
    Mechatronics, 2014
    Co-Authors: Krzysztof J. Kalinski, Marek A. Galewski
    Abstract:

    Abstract The paper concerns modern approaches towards minimising the Vibration level during the high speed milling process of flat flexible details. Dynamic analysis of the milling process is performed and dynamics of non-stationary controlled system in hybrid coordinates is described. On the basis of the process dynamics, as well as on the energy performance index, suitable control law is derived in order to Reduce Vibration level. This control law is applied for active force generation by the piezoceramic plate actuator. The implementation issues, which concern a proposed method of Vibration surveillance, are described. At first, in order to predict and obtain good efficiency of Vibration surveillance within a wide range of spindle speeds, Hardware-In-the-Loop Simulation (HILS), as a mean of mechatronic design, is applied. Subsequently, the predicted results are verified during the real cutting experiment. The latter ones evidenced good performance in the scope of Vibration reduction.

  • chatter Vibration surveillance by the optimal linear spindle speed control
    Mechanical Systems and Signal Processing, 2011
    Co-Authors: Krzysztof J. Kalinski, Marek A. Galewski
    Abstract:

    The paper concerns self-excited chatter Vibration during high speed slender ball-end milling. Non-stationary cutting process, with inclusion of various approaches towards dynamic characteristics of the process, is described. Dynamic analysis of the milling process is performed and dynamics of controlled closed loop system with time-delay is presented. In order to Reduce Vibration level, instantaneous change in the spindle speed appears as a control command, and thus—the method of Vibration surveillance by the spindle speed optimal-linear control is developed. Presented cutting models have been applied for the proposed method and procedure of the chatter Vibration surveillance with a use of variable spindle speed has been developed. Computer simulations are performed for selected cases of ball-end milling at constant and variable spindle speed. The results of them are successfully confirmed by experimental investigations on the Alcera Gambin 120CR milling machine equipped with the S2M high speed electrospindle.

Pradeep J Awasare - One of the best experts on this subject based on the ideXlab platform.

Krzysztof J. Kalinski - One of the best experts on this subject based on the ideXlab platform.

  • Optimal spindle speed determination for Vibration reduction during ball-end milling of flexible details
    International Journal of Machine Tools and Manufacture, 2015
    Co-Authors: Krzysztof J. Kalinski, Marek A. Galewski
    Abstract:

    In the paper a method of optimal spindle speed determination for Vibration reduction during ball-end milling of flexible details is proposed. In order to Reduce Vibration level, an original procedure of the spindle speed optimisation, based on the Liao-Young criterion [1], is suggested. As the result, an optimal, constant spindle speed value is determined. For this purpose, non-stationary computational model of machining process is defined. As a result of modelling, a hybrid system is described. This model consists of following subsystems, i.e. stationary model of one-side-supported flexible workpiece (modal subsystem), non-stationary discrete model of ball-end mill (structural subsystem) and conventional contact point between tool and workpiece (connective subsystem). The method requires identification of some natural frequencies of stationary modal subsystem. To determine them, appropriate modal experiments have to be performed on the machine tool, just before machining. Examples of Vibration surveillance during cutting process on two high speed milling machines Mikron VCP 600 and Alcera Gambin 120CR are illustrated.

  • Vibration surveillance supported by hardware in the loop simulation in milling flexible workpieces
    Mechatronics, 2014
    Co-Authors: Krzysztof J. Kalinski, Marek A. Galewski
    Abstract:

    Abstract The paper concerns modern approaches towards minimising the Vibration level during the high speed milling process of flat flexible details. Dynamic analysis of the milling process is performed and dynamics of non-stationary controlled system in hybrid coordinates is described. On the basis of the process dynamics, as well as on the energy performance index, suitable control law is derived in order to Reduce Vibration level. This control law is applied for active force generation by the piezoceramic plate actuator. The implementation issues, which concern a proposed method of Vibration surveillance, are described. At first, in order to predict and obtain good efficiency of Vibration surveillance within a wide range of spindle speeds, Hardware-In-the-Loop Simulation (HILS), as a mean of mechatronic design, is applied. Subsequently, the predicted results are verified during the real cutting experiment. The latter ones evidenced good performance in the scope of Vibration reduction.

  • chatter Vibration surveillance by the optimal linear spindle speed control
    Mechanical Systems and Signal Processing, 2011
    Co-Authors: Krzysztof J. Kalinski, Marek A. Galewski
    Abstract:

    The paper concerns self-excited chatter Vibration during high speed slender ball-end milling. Non-stationary cutting process, with inclusion of various approaches towards dynamic characteristics of the process, is described. Dynamic analysis of the milling process is performed and dynamics of controlled closed loop system with time-delay is presented. In order to Reduce Vibration level, instantaneous change in the spindle speed appears as a control command, and thus—the method of Vibration surveillance by the spindle speed optimal-linear control is developed. Presented cutting models have been applied for the proposed method and procedure of the chatter Vibration surveillance with a use of variable spindle speed has been developed. Computer simulations are performed for selected cases of ball-end milling at constant and variable spindle speed. The results of them are successfully confirmed by experimental investigations on the Alcera Gambin 120CR milling machine equipped with the S2M high speed electrospindle.

S.o. Reza Moheimani - One of the best experts on this subject based on the ideXlab platform.

  • Optimization and implementation of multimode piezoelectric shunt damping systems
    IEEE ASME Transactions on Mechatronics, 2002
    Co-Authors: A.j. Fleming, S. Behrens, S.o. Reza Moheimani
    Abstract:

    Piezoelectric transducer (PZT) patches can be attached to a structure in order to Reduce Vibration. The PZT patches essentially convert Vibrational mechanical energy into electrical energy. The electrical energy can be dissipated via an electrical impedance. Currently, impedance designs require experimental tuning of resistive circuit elements to provide optimal performance. A systematic method is presented for determining the resistance values by minimizing the H/sub 2/ norm of the damped system. After the design process, shunt circuits are normally implemented using discrete resistors, virtual inductors and Riordian gyrators. The difficulty in constructing the shunt circuits and achieving reasonable performance has been an ongoing and unaddressed problem in shunt damping. A new approach to implementing piezoelectric shunt circuits is presented. A synthetic impedance, consisting of a voltage controlled current source and a digital signal processor system, is used to synthesize the terminal impedance of a shunt network. A two-mode shunt circuit is designed and implemented for an experimental simply supported beam. The second and third structural modes of the beam are Reduced in magnitude by 22 and 18 dB.

  • Optimization and implementation of multi-mode piezoelectric shunt damping systems
    2002
    Co-Authors: A.j. Fleming, S. Behrens, S.o. Reza Moheimani, Senior Member
    Abstract:

    Abstract—Piezoelectric transducer (PZT) patches can be attached to a structure in order to Reduce Vibration. The PZT patches essentially convert Vibrational mechanical energy into electrical energy. The electrical energy can be dissipated via an electrical impedance. Currently, impedance designs require experimental tuning of resistive circuit elements to provide optimal performance. A systematic method is presented for determining the resistance values by minimizing the 2 norm of the damped system. After the design process, shunt circuits are normally implemented using discrete resistors, virtual inductors and Riordian gyrators. The difficulty in constructing the shunt circuits and achieving reasonable performance has been an ongoing and unaddressed problem in shunt damping. A new approach to implementing piezoelectric shunt circuits is presented. A synthetic impedance, consisting of a voltage controlled current source and a digital signal processor system, is used to synthesize the terminal impedance of a shunt network. A two-mode shunt circuit is designed and implemented for an experimental simply supported beam. The second and third structural modes of the beam are Reduced in magnitude by 22 and 18 dB. Index Terms—Damping, piezoelectric, resistor, shunt, synthesis. I

Sushil S Patil - One of the best experts on this subject based on the ideXlab platform.