scholarly journals Upgraded Kalman Filtering of Cutting Forces in Milling

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5397 ◽  
Author(s):  
Giovanni Totis ◽  
Zoltan Dombovari ◽  
Marco Sortino
Keyword(s):  
Kalman Filtering ◽  
High Speed ◽  
State Of The Art ◽  
Force Measurement ◽  
Frequency Bandwidth ◽  
Force Estimation ◽  
Extended Kalman Filtering ◽  
Force Application Point ◽  
Cutting Force Measurement ◽  
Identification Phase

Advanced piezoelectric dynamometers with a wide frequency bandwidth are required for cutting force measurement in high-speed milling and micromilling applications. In many applications, the signal bandwidth is limited by the dynamic response of the mechanical system, thus compensation techniques are necessary. The most effective compensation techniques for a full 3D force correction require an accurate and complex identification phase. Extended Kalman filtering is a better alternative for input force estimation in the presence of unknown dynamic disturbances. The maximum bandwidth that can be currently achievable by Kalman filtering is approximately 2 kHz, due to crosstalk disturbances and complex dynamometer’s dynamics. In this work, a novel upgraded Kalman filter based on a more general model of dynamometer dynamics is conceived, by also taking into account the influence of the force application point. By so doing, it was possible to extend the frequency bandwidth of the device up to more than 5 kHz along the main directions and up to more than 3 kHz along the transverse directions, outperforming state-of-the-art methods based on Kalman filtering.

scholarly journals Online state and input force estimation for multibody models employing extended Kalman filtering

2013 ◽  
Vol 32 (3) ◽  
pp. 317-336 ◽  
Author(s):  
Frank Naets ◽  
Roland Pastorino ◽  
Javier Cuadrado ◽  
Wim Desmet
Keyword(s):  
Kalman Filtering ◽  
Force Estimation ◽  
Extended Kalman Filtering ◽  
Input Force

Application of extended Kalman filtering to tracking of airborne high‐speed broadband acoustic sources

2001 ◽  
Vol 110 (5) ◽  
pp. 2739-2740
Author(s):  
William G. Frazier ◽  
Chad M. Williams ◽  
Jay E. Williams ◽  
Kenneth E. Gilbert
Keyword(s):  
Kalman Filtering ◽  
High Speed ◽  
Extended Kalman Filtering ◽  
Acoustic Sources

An Extended Kalman Filter Based Method for Fast In-Situ Etch Rate Measurements

1995 ◽  
Vol 406 ◽  
Author(s):  
T. L. Vincent ◽  
P. P. Khargonekar ◽  
F. L. Terry
Keyword(s):  
Kalman Filtering ◽  
High Speed ◽  
Etch Rate ◽  
Rate Measurement ◽  
Extended Kalman Filtering ◽  
Control Applications ◽  
Suitable Candidate ◽  
Multiple Wavelength ◽  
Speed Advantage

AbstractThe goal of this paper is the presentation of a new algorithm for determining etch rate from single or multiple wavelength reflectometry data. This algorithm is based on techniques from recursive nonlinear estimation theory — Extended Kalman Filtering. A major advantage of our algorithm is extremely high speed. Consequently, it can be used in real-time feedback control applications. The speed advantage also makes it a suitable candidate for full wafer high speed etch rate measurement.

Study of the Method on Cutting-Force Modeling Based on the Current of High-Speed Electric Spindles

2010 ◽  
Vol 156-157 ◽  
pp. 517-522
Author(s):  
Song Sheng Li ◽  
Hua Wei Mao ◽  
Ping Chen ◽  
Xiao Huang ◽  
Xiao Yang Chen
Keyword(s):  
Cutting Force ◽  
High Speed ◽  
Force Measurement ◽  
Special Test ◽  
Test Bed ◽  
Measurement Systems ◽  
Force Modeling ◽  
Cutting Force Measurement ◽  
Vertical Milling Machine ◽  
Force Measurement System

It is important to build the models for calculating the cutting-forces in high-speed machining, but it is difficult as the special test-bed with the cutting-force measurement system is complicated, cost much and cannot be applied directly on general machining tools. Aiming at the problems above, a new method was put forward about cutting-force modeling based on the current of high-speed electric spindles, in which the cutting-force models could be gained indirectly by analyzing the built-in motor current and the data gotten from cutting experiments on those general machining tools which are installed with electric spindles. Then on a vertical milling machine tool which is equipped with a high-speed electric spindle, a model for calculating the milling force was gotten using the method put forward by this paper. The results show that the method is simple and easy to be used in routine machine tools in plant spots and need no any special test-beds and any complicated measurement systems possessed only in the laboratory conditions.

scholarly journals Neuro-Inspired Computing with Spin-VCSELs

2021 ◽  
Vol 11 (9) ◽  
pp. 4232
Author(s):  
Krishan Harkhoe ◽  
Guy Verschaffelt ◽  
Guy Van der Sande
Keyword(s):  
Processing Speed ◽  
Delay Time ◽  
High Speed ◽  
State Of The Art ◽  
Polarization Modulation ◽  
Time Interval ◽  
Computing Technique ◽  
High Modulation ◽  
Short Time ◽  
Modulation Speed

Delay-based reservoir computing (RC), a neuromorphic computing technique, has gathered lots of interest, as it promises compact and high-speed RC implementations. To further boost the computing speeds, we introduce and study an RC setup based on spin-VCSELs, thereby exploiting the high polarization modulation speed inherent to these lasers. Based on numerical simulations, we benchmarked this setup against state-of-the-art delay-based RC systems and its parameter space was analyzed for optimal performance. The high modulation speed enabled us to have more virtual nodes in a shorter time interval. However, we found that at these short time scales, the delay time and feedback rate heavily influence the nonlinear dynamics. Therefore, and contrary to other laser-based RC systems, the delay time has to be optimized in order to obtain good RC performances. We achieved state-of-the-art performances on a benchmark timeseries prediction task. This spin-VCSEL-based RC system shows a ten-fold improvement in processing speed, which can further be enhanced in a straightforward way by increasing the birefringence of the VCSEL chip.

Three-axial cutting force measurement in micro/nano-cutting by utilizing a fast tool servo with a smart tool holder

CIRP Annals ◽  
2021 ◽  
Author(s):  
Yuan-Liu Chen ◽  
Fuwen Chen ◽  
Zhongwei Li ◽  
Yang Zhang ◽  
Bingfeng Ju ◽  
...  
Keyword(s):  
Cutting Force ◽  
Force Measurement ◽  
Fast Tool Servo ◽  
Tool Holder ◽  
Cutting Force Measurement

scholarly journals Cavitation patterns in high-pressure homogenization nozzles with cylindrical orifices: Influence of mixing stream in Simultaneous Homogenization and Mixing

2021 ◽  
Author(s):  
V. Gall ◽  
E. Rütten ◽  
H. P. Karbstein
Keyword(s):  
High Pressure ◽  
Process Design ◽  
High Speed ◽  
State Of The Art ◽  
Back Pressure ◽  
High Pressure Homogenization ◽  
Unit Operation ◽  
Mixing Chamber ◽  
Cavitation Intensity ◽  
Droplet Sizes

AbstractHigh-pressure homogenization is the state of the art to produce high-quality emulsions with droplet sizes in the submicron range. In simultaneous homogenization and mixing (SHM), an additional mixing stream is inserted into a modified homogenization nozzle in order to create synergies between the unit operation homogenization and mixing. In this work, the influence of the mixing stream on cavitation patterns after a cylindrical orifice is investigated. Shadow-graphic images of the cavitation patterns were taken using a high-speed camera and an optically accessible mixing chamber. Results show that adding the mixing stream can contribute to coalescence of cavitation bubbles. Choked cavitation was observed at higher cavitation numbers σ with increasing mixing stream. The influence of the mixing stream became more significant at a higher orifice to outlet ratio, where a hydraulic flip was also observed at higher σ. The decrease of cavitation intensity with increasing back-pressure was found to be identical with conventional high-pressure homogenization. In the future, the results can be taken into account in the SHM process design to improve the efficiency of droplet break-up by preventing cavitation or at least hydraulic flip.

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