Adaptive Active Vibration Control for Machine Tools with Highly Position-Dependent Dynamics

Kleinwort, Robin; Platz, Jonathan; Zaeh, Michael F.

doi:10.20965/ijat.2018.p0631

Cited by 11 publications

(5 citation statements)

References 17 publications

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“…Thus, it makes sense to try a control system with feedback to maintain the specified vibration amplitude of VDH's moving part. There are many algorithms of active control for cutting dynamics [21][22][23], however, they were designed to suppress chatter instead of maintaining it on a required level. The developed algorithms therefore can't be used in vibration cutting.…”

Section: Fig 2 Scheme Of Vibration Drilling With Controlmentioning

confidence: 99%

The system for adaptive control of axial tool oscillations in vibratory drilling: description and experimental study

Ivanov¹,

Voronov²,

Kiselev³

2021

Preprint

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Reliable segmentation and evacuation of chips from the cutting zone are essential for effective deep hole drilling. Drilling with low-frequency axial vibrations ensures these useful effects because cutting edges periodically leave the cutting zone. Useful tool vibrations can be maintained by using a special self-vibratory drilling head. The drilling head has an elastic element and ensures the self-excitation of vibrations due to the regenerative effect. However, high damping in the cutting zone suppresses axial self-vibrations and renders such a drilling head inexpedient for the industry. In this study, a novel system of adaptive control of the vibration drilling process was developed. The control objective is to maintain a specified peak-to-peak (PTP) value of vibration displacements. Due to in-process adaptation of the feedback gain, the control system supplies additional energy if vibrations are not self-excited and removes energy if the PTP vibration displacements are greater than the specified value. To test the workability of the system, an experimental setup was made. In the setup, the actuator force acts on an elastically fixed workpiece. The dynamic properties of the setup are equivalent to those of the vibration drilling head. The algorithm of feedback gain adaptation was implemented with a microcontroller. A number of experiments for different drilling regimes revealed that the control system successfully maintains the specified PTP value of displacements. The developed control system can be implemented on a vibration drilling head because only an accelerometer is required for control and the required actuator force is under 100 N.

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Section: Fig 2 Scheme Of Vibration Drilling With Controlmentioning

confidence: 99%

The system for adaptive control of axial tool oscillations in vibratory drilling: description and experimental study

Ivanov¹,

Voronov²,

Kiselev³

2021

Preprint

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“…Robust active control of machine tool vibrations has been shown to be effective to mitigate instabilities due to changing and nonlinear dynamics (Abele et al, 2016; Zaeh et al, 2017). Adaptive control has also shown to be effective to mitigate chatter instabilities (Claesson and Håkansson, 1998; Fallah and Moetakef-Imani, 2019; Kleinwort et al, 2018). However, since these previous uses of robust and/or adaptive control schemes required dynamical models of the machine tool and the process, they are less suited for industrial implementation, which prefers the simple to implement non-model based schemes (Chung et al, 1997; Cowley and Boyle, 1969; Mancisidor et al, 2015b; Munoa et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Adaptive control to actively damp bistabilities in highly interrupted turning processes using a hardware-in-the-loop simulator

Sahu

Law

Wahi

2021

Journal of Vibration and Control

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Interruptions in turning make the process forces non-smooth and nonlinear. Smooth nonlinear cutting forces result in the process of being stable for small perturbations and unstable for larger ones. Re-entry after interruptions acts as perturbations making the process exhibit bistabilities. Stability for such processes is characterized by Hopf bifurcations resulting in lobes and period-doubling bifurcations resulting in narrow unstable lenses. Interrupted turning remains an important technological problem, and since experimentation to investigate and mitigate instabilities are difficult, this paper instead emulates these phenomena on a controlled hardware-in-the-loop simulator. Emulated cutting on the simulator confirms that bistabilities persist with lobes and lenses. Cutting in bistable regimes should be avoided due to conditional stability. Hence, we demonstrate the use of active damping to stabilize cutting with interruptions/perturbations. To stabilize cutting with small/large perturbations, we successfully implement an adaptive gain tuning scheme that adapts the gain to the level of interruption/perturbation. To facilitate real-time detection of instabilities and their control, we characterize the efficacy of the updating scheme for its dependence on the time required to update the gain and for its dependence on the levels of gain increments. We observe that higher gain increments with shorter updating times result in the process being stabilized quicker. Such results are instructive for active damping of real processes exhibiting conditional instabilities prone to perturbations.

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“…Most of the journal publications deal with vibration suppression control methods. Two interesting examples are papers [6,7]. Article [6] describes a method for automatic tuning of an active vibration control system using inertial actuators.…”

Section: Introductionmentioning

confidence: 99%

“…Article [6] describes a method for automatic tuning of an active vibration control system using inertial actuators. Article [7] presents adaptive active vibration control for machine tools with highly position-dependent dynamics. The adaptive controller was implemented on an industrial PLC and represents one of the real possibilities for controlling the two-axial actuator presented in this article.…”

Section: Introductionmentioning

confidence: 99%

Design of Two-Axial Actuator for Controlled Vibration Damper for Large Rams

et al. 2021

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Machine tool rams are important constructional elements found on vertical lathes as well as on many other machines. In most cases, a machine tool ram constitutes an assembly with significant dynamic compliance that affects the machine’s ability to achieve stable cutting conditions. There are various solutions for increasing a machine tool ram’s stiffness and damping. This paper describes an innovative concept of a two-axial electromagnetic actuator for controlled vibration dampers with high dynamic force values. The described solution is purposefully based on the use of standard electric drives. As a result, the size of the actuator is easier to scale to the required application. The solution is designed as a spacer between the end of the ram and the head. The paper presents the actuator concept, construction design, current control loop solution and experimental verification of the controlled vibration damper’s function on the test ram in detail. The presented position measurement concept will enable the use of non-contact position sensors for motor commutation as well as for possible use in vibration suppression control. Applications can be expected mainly in the field of vibration suppression of vertical rams of large machine tools.

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Adaptive Active Vibration Control for Machine Tools with Highly Position-Dependent Dynamics

Cited by 11 publications

References 17 publications

The system for adaptive control of axial tool oscillations in vibratory drilling: description and experimental study

The system for adaptive control of axial tool oscillations in vibratory drilling: description and experimental study

Adaptive control to actively damp bistabilities in highly interrupted turning processes using a hardware-in-the-loop simulator

Design of Two-Axial Actuator for Controlled Vibration Damper for Large Rams

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