Effect of Nominal Chip Thickness on Stability of Interrupted Turning

Chen, Lihai; Zhang, Lianhong; Man, Jia

doi:10.1155/2014/579178

Cited by 5 publications

(4 citation statements)

References 19 publications

(67 reference statements)

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“…The study recommends a one and two degree of freedom (DOF) dynamic model to carry out the effect of the tangential mode on chip regeneration in the regenerative plane. Chen et al [6] developed a new dynamic cutting force model with nominal chip thickness to estimate the stability of interrupted turning, in which the dynamical cutting force is described by a function of the nominal chip thickness and the dynamical chip thickness. Both numerical and experimental tests demonstrate a strong correlation between the nominal chip thickness and the interrupted turning stability, and the recommended model is competent for the interrupted turning process.…”

Section: Introductionmentioning

confidence: 99%

A hybrid decision making approach to prevent chatter vibrations

Sofuoğlu

Orak

2015

Applied Soft Computing

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Section: Introductionmentioning

confidence: 99%

A hybrid decision making approach to prevent chatter vibrations

Sofuoğlu

Orak

2015

Applied Soft Computing

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“…The dynamic equations of the femoral shaft change due to tissue removal as the sharp cutting edge of the drill bit perforated and goes through the cancellous bone, taking out the chips and particles of the fractured spongy trabeculae to the bone surface, sometimes resulting to clogging or trapping of the drill inside the bone which consequently needs high cutting force and speed which ultimately resulted in high vibration; 17 sometimes if not well handled could cause tool breakage and microcrack. The schematic diagram of femur shaft illustrated in Figure 6 is assumed to be surrounded by tissues; therefore, it can also be further modelled as the mass‐spring system.…”

Section: Mathematical Modelling Of Bone Damping Systemmentioning

confidence: 99%

Design of a vibration damping robot and force evaluation in intraoperative robotic‐assisted femoral shaft repair using a modified soft damper

Adewale

Wang

et al. 2021

Robotics Computer Surgery

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Background: Closed intra-medullary nailing fixation is a method for treating fractured femurs with minimal invasiveness. However, this method lacks safety and precision. To avert prevailing problems such as extended cracks in the already broken bone, the design of a vibration damping robot and force evaluation system is essential.Methods: This paper presents a sensor-based clamping robot system embedded with a regulated pressurised air balloon. Drilling forces were monitored by a force sensor attached to the end robot effector, while the reduced vibration result was measured by a non-contact laser displacement sensor. A 2 degree-of-freedom (2DOF) model was developed.Results: Force and vibration data were obtained using a data acquisition module (EMS 309) and analysed using MATLAB software (Version R2015b). The results obtained show that both the frequencies and amplitudes of the vibration is reduced at 6 bar with effector's spindle speed of 1500 rpm. Conclusions:This proposed concept shows that drilling force and vibration can be reduced simultaneously using a robot effector coupled with a damper.

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“…In addition, in highly interrupted turning, sometimes there is an additional loss of stability due to period-doubling bifurcations resulting in stability lenses (Corpus and Endres, 2004; Stépán et al, 2005; Szalai and Stépán, 2006). Furthermore, the interruptions make the cutting forces non-smooth (Zanka et al, 2010), and nonlinear (Chen et al, 2015; Corpus and Endres, 2004; Stépán et al, 2005; Szalai and Stépán, 2006). The smooth cutting force nonlinearities make the process unstable for large perturbations, while for small ones, it remains stable, thus forming a bistable region (Kalmar-Nagy et al, 1999; Shi and Tobias, 1984).…”

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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Effect of Nominal Chip Thickness on Stability of Interrupted Turning

Cited by 5 publications

References 19 publications

A hybrid decision making approach to prevent chatter vibrations

A hybrid decision making approach to prevent chatter vibrations

Design of a vibration damping robot and force evaluation in intraoperative robotic‐assisted femoral shaft repair using a modified soft damper

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

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