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ESKATU INFORMAZIOA

 
ARTIKULU ZIENTIFIKOAK

Gure artikulu zientifiko, tesiak, metodoak, memoriak eta zabalkunde teknologikoa.

EGILEAK:

Non-smooth torus to identify domain of attraction of stable milling processes

Non-smooth torus to identify domain of attraction of stable milling processes
Recent technological trends tend to introduce cyber physical system (CPS, [1]) solutions in machine tools to self-sense and self-act during cutting operations. These capabilities of this envisioned enhanced machine tool [2] need to be strengthened by more accurate modelling of the combined controlled cutting process. To ensure quality and productivity requirements vibration must be attenuated. The regeneration, when the past motion of the tool excites the dynamics via the just cut surface is known since the middle of the last century published by the Pioneers in [3] and in [4]. Mathematically, the system can be represented by delay differential equations (DDEs), which generate infinite dimensional phase space. Particularly, milling is a time periodic delayed system. By this form, the asymptotic stability of the stationary cutting solution can be predicted as an important technological requirement in the industry. Unstable stationary cutting leads to the onset of growing vibration limited by a threshold effect when cutting edges, often irregularly, leave and enter the cutting state. This, generally high amplitude limiting vibration is mathematically stable. In its developed form, it is referred as chatter vibration, while the threshold effect that limits the vibration is called as fly-over by the machine tool industry. Apart from the purely nonlinear origin bistable region caused by smooth quasi-periodic solutions in milling [5], tight attraction zone can be formed around the stable stationary solution due to only the non-smooth fly-over effect. This was first experienced using time-domain solution in the motivational work in [6]. In this article island-like stability
domain (figure 1a) were presented that are enclosed by Hopf- and period doubling (PD)-kind stability boundaries. As it was shown in that paper, this was originated from the interactions of multiple modes through modulations of the main vibration frequency of the critical ’self-excited’ solution. However, in the presented particular example, this island was experienced to have tight attraction zone (figure 1b) by simulation of the corresponding piecewise linear but fly-over model. This work shows methods to predict the size of the attraction zone approximately and also to envision a general numerical description to calculate the real threshold case as a quasi-periodic solution.
ALDIZKARIA/HITZALDIA:

ENOC 2017

INFORMAZIO GEHIAGORENTZAT JAR ZAITEZ GUREKIN HARREMANETAN

(34)943 748 000

ARTIKULU ERLAZIONATUAK

An automatic spindle speed selection strategy to obtain a stability of high speed milling
2010 KO URTARRILA

Analysis of Directional Factors in Milling: Importance of Multifrequency Calculation and of the Inclusion of the Effect of the Helix Angle
2010 KO URTARRILA

Application of continuous spindle speed variation for chatter avoidance in roughing milling.
2011 KO URTARRILA

Prediction of multiple dominant chatter frequencies in millingprocesses
2011 KO URTARRILA

Identification of cutting force characteristics based on chatter experiments
2011 KO URTARRILA

Chatter suppression in a high speed magnetic spindle by adding damping
2014 KO URTARRILA

Ball bearings damage detection using traditional signal processing algorithms
2013 KO URTARRILA

An Integrated System for Machine Tool Spindle Head Ball Bearing Fault Detection and Diagnosis
2013 KO URTARRILA

Effect of Mode interaction on stability of milling processes
2013 KO URTARRILA

Optimisation of face milling operations with structural chatter using a stability model based process planning methodology
2014 KO URTARRILA

Receptance coupling for tool point dynamic prediction by fixed boundaries approach
2014 KO URTARRILA

Cylindrical milling tools: Comparative real case study for process stability
2014 KO URTARRILA

Stability analysis of milling with irregular pitch tools by the implicit subspace iteration method
2014 KO URTARRILA

Coupled model for simulating active inertial actuators in milling processes
2015 KO URTARRILA

Implicit subspace iteration as an efficient method to compute milling stability lobe diagrams
2015 KO URTARRILA

Active suppression of structural chatter vibrations using machine drives and accelerometers

Hardware-in-the-loop simulator for stability study in orthogonal cutting
2015 KO URTARRILA

Chatter suppression in ram type travelling column millling machines using a biaxial inertial actuator
2013 KO URTARRILA