Autoresonant control of ultrasonically assisted cutting

Babitsky, Vladimir; Kalashnikov, Alexander; Molodtsov, F.V.

doi:10.1016/s0957-4158(03)00014-x

Cited by 67 publications

(40 citation statements)

References 13 publications

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“…However, the difficulties occur with the use of such sensors within the industrial environment. As was found by Babitsky et al [5], the accelerometer had some problems with its permanent fixing to the transducer in conditions with high levels of vibration. The laser vibrometer and the microphone provide the possibility of remote operation and do not need to be fixed to the transducer.…”

Section: Strategies Of Auto Resonant Controlmentioning

confidence: 97%

“…Capability to withstand the prolonged and high level of vibration necessary for the ultrasonic machining. For the first four sensors there are some recommendations from the previous research, which will be taken into account [5]. The latter sensor (as far as the author is aware) has never been used in UAM before.…”

Section: Strategies Of Auto Resonant Controlmentioning

confidence: 99%

“…The Q factor is the dimensionless number determining the degree of resonant response and the sensitivity of the system to small variations in the driving vibration frequency. The high Q-factor systems demonstrate very high sensitivity to changing operating loads and parameters and the loss of efficiency occurs when a load is variable or with attachments of different tools [5].…”

mentioning

confidence: 99%

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Modelling of autoresonant control of ultrasonic transducer for machining applications

Voronina

Babitsky

Meadows

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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A computer model of a non-linear ultrasonic vibrating system with the possibility of autoresonant control is presented in this paper. The system controlled consists of two modules, the first of which is an electromechanical model of an ultrasonic transducer comprising a piezoelectric transducer and a step concentrator. The second module simulates an influence from the machining process. Coefficients of the electromechanical model and its validity were estimated through an identification process based on the experiments with a real ultrasonic transducer. Further, a numerical model of the autoresonant control of this system has been developed. The autoresonant control maintains the resonant regime of oscillation by means of positive feedback, which provides transformation and amplification of the control signal. The model allows the use and comparison of three control strategies depending on the different electrical and mechanical feedback control signals. The results from simulation and from real machining experiments under different control strategies are compared and discussed.

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Section: Strategies Of Auto Resonant Controlmentioning

confidence: 97%

Section: Strategies Of Auto Resonant Controlmentioning

confidence: 99%

mentioning

confidence: 99%

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Modelling of autoresonant control of ultrasonic transducer for machining applications

Voronina

Babitsky

Meadows

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The two excitation methods are shown in Figure 5. In the upper part, a self-excitation configuration is presented; this is also called autoresonant or self-resonant (Babitsky et al, 2004;Babitsky and Sokolov, 2007). A band-pass filter can be added into the positive-feedback loop in order to select the desired resonance frequency or to add a phase shift to the feedback.…”

Section: Transient Response Of Vibration Amplitudementioning

confidence: 99%

Transient amplitude behavior analysis of nonlinear power ultrasonic transducers with application to ultrasonic squeeze film levitation

Mojrzisch

Wallaschek

2012

Journal of Intelligent Material Systems and Structures

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In this article, force and self-excitation driving methods for ultrasonic transducers are compared with each other in sense of their transient amplitude behavior in the presence of nonlinearities. An equivalent circuit transducer model is simplified to a series oscillator. The simplified model is averaged by the Van der Pol method in order to reduce the system at hand to its amplitude dynamics. The transient amplitude behavior of both driving methods is presented in an analytical form. At high vibration amplitudes, the system's natural frequency varies due to the nonlinear stiffness of the piezoelectric material and the vibration amplitude is likely to break down due to the jump phenomena. Therefore, the averaged models are extended by the nonlinear effects. From the amplitude behavior analysis of both systems, it follows that self-excitation is the preferable driving method in sense of obtaining a high operation bandwidth and a stable oscillation.

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“…Consequently, the P100 control unit (from Sonic Systems Ltd., Ilminster, UK) locks the phase between current and voltage to the piezoceramic rings and compensates power during drilling [18], in order to ensure ultrasonic amplitude remains steady.…”

Section: Amplitude Control System Designmentioning

confidence: 99%

A Parametric Study for the Design of an Optimized Ultrasonic Percussive Planetary Drill Tool

Harkness

Worrall

et al. 2017

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Abstract-Traditional rotary drilling for planetary rock sampling, in-situ analysis and sample return, is challenging because the axial force and holding torque requirements are not necessarily compatible with lightweight spacecraft architectures in low-gravity environments. This article seeks to optimize an ultrasonic-percussive drill tool to achieve rock penetration with lower reacted force requirements, with a strategic view towards building an Ultrasonic Planetary Core Drill (UPCD) device. The UPCD is a descendant of the Ultrasonic/Sonic Driller/Corer (USDC) technique. In these concepts, a transducer and horn (typically resonant at around 20kHz) is used to excite a toroidal free-mass which oscillates chaotically between the horn tip and drill base at lower frequencies (generally between 10Hz to 1kHz). This creates a series of stress pulses which are transferred through the drill-bit to the rock surface and, while the stress at the drill-bit tip/rock interface exceeds the compressive strength of the rock, cause fractures that result in fragmentation of the rock. This facilitates augering and downward progress. In order to ensure that the drill-bit tip delivers the greatest effective impulse (the time-integral of the drill-bit tip/rock pressure curve exceeding the strength of the rock), parameters such as the spring rates and the mass of the free-mass, drill-bit and transducer have been varied and compared in both computer simulation and in practical experiment. The most interesting findings, and those of particular relevance to deep drilling, indicate that increasing the mass of the drill-bit has a limited (or even positive) influence on the rate of effective impulse delivered.

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Autoresonant control of ultrasonically assisted cutting

Cited by 67 publications

References 13 publications

Modelling of autoresonant control of ultrasonic transducer for machining applications

Modelling of autoresonant control of ultrasonic transducer for machining applications

Transient amplitude behavior analysis of nonlinear power ultrasonic transducers with application to ultrasonic squeeze film levitation

A Parametric Study for the Design of an Optimized Ultrasonic Percussive Planetary Drill Tool

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