Real-Time Performance of Mechatronic PZT Module Using Active Vibration Feedback Control

Aggogeri, Francesco; Borboni, Alberto; Merlo, Angelo; Pellegrini, Nicola; Ricatto, Raffaele

doi:10.20944/preprints201608.0035.v1

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…In particular, this study presents an active vibration control (AVC) system based on a feedback-feedforward adaptive harmonic steady-state (HSS) architecture of a 3-degree-offreedom (DOF) mechanism. Compared with a previous research developed by the authors Aggogeri et al (2016), this study illustrates a more flexible regulator able to control the mechatronic device at high spindle speed (>15,000 r/min) to contain vibrations in the broadband of frequencies (100 Hz-900 Hz). The mechatronic system consists of a platform embedded in the vertical axis of a milling machine as an interface between the spindle and ram (Z-axis).…”

Section: Introductionmentioning

confidence: 80%

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Active vibration control development in ultra‐precision machining

Aggogeri

Merlo

Pellegrini

2020

Journal of Vibration and Control

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This study presents a combined feedback–feedforward adaptive regulator applied to an active vibration control tool holder platform to contain the effect of machining vibrations. The proposed mechatronic solution can be integrated in a milling machine tool as an interface between the beam ( Z-axis) and the tool holder. The aim is to counteract vibrations in the broadband frequency range (100 Hz–900 Hz), controlling the tool position in real time. The active vibration control system is based on the harmonic steady-state concept due to the sinusoidal representation of the disturbance signals. The study focuses on the regulator architecture and the main logics applied to satisfy the required performance. A full investigation is executed through simulations and experimental campaigns, proving the disturbance reduction. The active vibration control system is implemented on a 4-axis machine tool and validated using multitonal disturbances. The system is evaluated in compensating a set of undesired effects, such as vibrations generated by unbalanced tools or hard material cutting processes. The obtained results show a maximum reduction of the vibration amplitude by 43.7% at the critical frequency.

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Section: Introductionmentioning

confidence: 80%

“…The detailed mechanical platform characteristics are described in Aggogeri et al (2016). Compared with this previous work, the proposed study shows substantial modifications of the mechatronic device to properly increase the performance in containing the vibrations in the medium-high-frequency range.…”

Section: Avc Concept and Adaptive Controller Formulationmentioning

confidence: 95%

Active vibration control development in ultra‐precision machining

Aggogeri

Merlo

Pellegrini

2020

Journal of Vibration and Control

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“…In addition, the angle change of the force application increases the control difficulty. 83,84 The major part of the proposed devices uses DC electric motors to actuate the system. These motors are reliable and easy to control.…”

Section: Hand Exoskeleton Robotic Devicesmentioning

confidence: 99%

Robotics for rehabilitation of hand movement in stroke survivors

Aggogeri

Mikołajczyk

O'Kane

2019

Advances in Mechanical Engineering

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This article aims to give an overall review of research status in hand rehabilitation robotic technology, evaluating a number of devices. The main scope is to explore the current state of art to help and support designers and clinicians make better choices among varied devices and components. The review also focuses on both mechanical design, usability and training paradigms since these parts are interconnected for an effective hand recovery. In order to study the rehabilitation robotic technology status, the devices have been divided in two categories: end-effector robots and exoskeleton devices. The end-effector robots are more flexible than exoskeleton devices in fitting the different size of hands, reducing the setup time and increasing the usability for new patients. They suffer from the control of distal joints and haptic aspects of object manipulation. In this way, exoskeleton devices may represent a new opportunity. Nevertheless their design is complex and a deep investigation of hand biomechanics and physical human-robot interaction is required. The main hand exoskeletons have been developed in the last decade and the results are promising demonstrated by the growth of the commercialized devices. Finally, a discussion on the complexity to define which design is better and more effective than the other one is summarized for future investigations.

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Vibration Damping Analysis of Lightweight Structures in Machine Tools

et al. 2017

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The dynamic behaviour of a machine tool (MT) directly influences the machining performance. The adoption of lightweight structures may reduce the effects of undesired vibrations and increase the workpiece quality. This paper aims to present and compare a set of hybrid materials that may be excellent candidates to fabricate the MT moving parts. The selected materials have high dynamic characteristics and capacity to dampen mechanical vibrations. In this way, starting from the kinematic model of a milling machine, this study evaluates a number of prototypes made of Al foam sandwiches (AFS), Al corrugated sandwiches (ACS) and composite materials reinforced by carbon fibres (CFRP). These prototypes represented the Z-axis ram of a commercial milling machine. The static and dynamical properties have been analysed by using both finite element (FE) simulations and experimental tests. The obtained results show that the proposed structures may be a valid alternative to the conventional materials of MT moving parts, increasing machining performance. In particular, the AFS prototype highlighted a damping ratio that is 20 times greater than a conventional ram (e.g., steel). Its application is particularly suitable to minimize unwanted oscillations during high-speed finishing operations. The results also show that the CFRP structure guarantees high stiffness with a weight reduced by 48.5%, suggesting effective applications in roughing operations, saving MT energy consumption. The ACS structure has a good trade-off between stiffness and damping and may represent a further alternative, if correctly evaluated.

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Real-Time Performance of Mechatronic PZT Module Using Active Vibration Feedback Control

Cited by 7 publications

References 38 publications

Active vibration control development in ultra‐precision machining

Active vibration control development in ultra‐precision machining

Robotics for rehabilitation of hand movement in stroke survivors

Vibration Damping Analysis of Lightweight Structures in Machine Tools

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