scholarly journals Learning Based Cross-Coupled Control for Multi-Axis High Precision Positioning Systems

2012 ◽  
Author(s):  
Nurcan Gecer Ulu ◽  
Erva Ulu ◽  
Melih Cakmakci
Keyword(s):  
High Precision ◽  
Precision Positioning ◽  
Positioning Systems

Issues in validation of pre-sliding friction models for ultra-high precision positioning

2018 ◽  
Vol 233 (3) ◽  
pp. 997-1006 ◽  
Author(s):  
Ervin Kamenar ◽  
Saša Zelenika
Keyword(s):  
High Precision ◽  
Sliding Friction ◽  
Hysteretic Behavior ◽  
Slip Model ◽  
Precision Positioning ◽  
Positioning Systems ◽  
The Real ◽  
Sliding Motion ◽  
Real Behavior ◽  
Friction Models

Friction is one of the main disturbances in nanometric positioning. Recently, it was shown that ultra-high precision positioning typically happens in the pre-sliding motion regime where friction is characterized by an elasto-plastic nonlinear hysteretic behavior with a marked stochastic variability. With the aim of providing the tools for the development of robust control typologies for ultra-high precision mechatronics devices, different pre-sliding friction models are thus considered in this work. The most relevant ones are hence experimentally validated, as well as compared in terms of the complexity of identifying their characteristic parameters and of simulating the factual dynamic response. It is hence shown that the generalized Maxwell-slip model can account for all the important pre-sliding frictional effects in nanometric positioning applications. A thorough sensitivity analysis of the parameters of the generalized Maxwell-slip model model is therefore performed allowing to establish that three Maxwell-slip blocks are the minimum needed to approximate the behavior of the real precision positioning systems, six blocks allow representing excellently the real behavior, while the slower dynamics, which induces a difficult real-time implementation, with a very limited gain in terms of model accuracy, does not justify the usage of a larger number of elements.

Hardware Structures for High Precision Pneutronic Systems

2014 ◽  
Vol 658 ◽  
pp. 541-546 ◽  
Author(s):  
Mihai Avram ◽  
Victor Constantin ◽  
Constantin Bucşan ◽  
Daniel Besnea ◽  
Alina Spanu
Keyword(s):  
High Precision ◽  
Weight Ratio ◽  
Nonlinear Behavior ◽  
Compressed Air ◽  
Power Weight ◽  
Precision Positioning ◽  
Positioning Accuracy ◽  
Large Power ◽  
Pneumatic Actuators ◽  
Positioning Systems

Pneutronic systems come with a series of advantages that are natural to working with compressed air, such as the large power/weight ratio of pneumatic actuators, easy and affordable installation and maintenance as well as being clean working systems. However, due to working with compressed air, there are a series of issues, such as static and transient nonlinear behavior, mostly due to the high compressibility of air. Thus, the behavior of such systems is hard to control, especially in terms of precision positioning. The paper deals with proposing three hardware configurations of pneutronic positioning systems in order to assure the imposed positioning accuracy in the presence of disturbances and the preservation in time of the obtained position.

scholarly journals Increase robustness of the method of diagnostics and identification of high-precision positioning systems

2017 ◽  
Vol 132 ◽  
pp. 04001
Author(s):  
Anton Lankin ◽  
Valery Grechikhin ◽  
Lankin Michail
Keyword(s):  
High Precision ◽  
Precision Positioning ◽  
Positioning Systems

Precision Positioning Systems: An Overview of the State of Art

2013 ◽  
Vol 336-338 ◽  
pp. 1170-1173 ◽  
Author(s):  
Francesco Aggogeri ◽  
Alberto Borboni ◽  
Rodolfo Faglia ◽  
Angelo Merlo ◽  
Sara de Cristofaro
Keyword(s):  
High Precision ◽  
Rapid Growth ◽  
The State ◽  
Flexure Hinge ◽  
Actual State ◽  
Positioning System ◽  
Precision Positioning ◽  
Positioning Systems ◽  
Innovative Solutions ◽  
State Of Art

In the industrial world the interest in Precision Positioning Systems is exponentially increasing in relation to the rapid growth of Ultra High Precision (UHP) machining. A greater attention is given to traditional techniques and developing of innovative solutions. This paper intends to present a review of the actual state of art in precision positioning system based on flexure hinge related to industrial machines, showing a comparison between different techniques.

GPS and Inertial Systems for High Precision Positioning on Motorways

2009 ◽  
Vol 62 (2) ◽  
pp. 351-363 ◽  
Author(s):  
J. E. Naranjo ◽  
F. Jiménez ◽  
F. Aparicio ◽  
J. Zato
Keyword(s):  
High Precision ◽  
Autonomous Vehicles ◽  
Information Source ◽  
Base Station ◽  
Precision Positioning ◽  
Differential Gps ◽  
Collision Warning ◽  
Positioning Systems ◽  
The Road ◽  
Lane Departure

The accurate location of a vehicle in the road is one of the most important challenges in the automotive field. The need for accurate positioning affects several in-vehicle systems like navigators, lane departure warning systems, collision warning and other related sectors such as digital cartography suppliers. The aim of this paper is to evaluate high precision positioning systems that are able to supply an on-the-centimetre accuracy source to develop on-the-lane positioning systems and to be used in future applications as an information source for autonomous vehicles that circulate at high speeds on public roads. In this paper we have performed some on-road experiments, testing several GPS-based systems: Autonomous GPS; RTK Differential GPS with a proprietary GPS base station; RTK Differential GPS connected to the public GPS base station network of the National Geographic Institute of Spain via vehicle-to-infrastructure GPRS communications; and GPS combination with inertial measurement systems (INS) for position accuracy maintenance in degraded satellite signal reception areas. In these tests we show the validity and the comparison of these positioning systems, allowing us to navigate, in some cases, on public roads at speeds near 120 km/h and up to 100 km from the start position without any significant accuracy reduction.

scholarly journals Methodic of measuring of geometric displacements of a moving object

2020 ◽  
pp. 62-66
Author(s):  
В.В. Лопатина ◽  
В.Г. Сенченко
Keyword(s):  
High Precision ◽  
Position Control ◽  
Moving Object ◽  
Transport Systems ◽  
Contactless Measurement ◽  
Precision Positioning ◽  
High Precision Measurement ◽  
Sea Transport ◽  
Positioning Systems ◽  
Vertical Displacements

Одной из задач компьютерного зрения является задача обработки изображений для бесконтактного измерения физических величин. Например, бесконтактное высокоточное измерение продольного, поперечного и вертикального смещения подвижного объекта, учитывая особенности его размера, формы, скорости маневрирования, скорости движения. Предлагаемая работа содержит описание подхода к решению таких задач. В работе предложена методика проведения бесконтактных измерений геометрических перемещений подвижного объекта относительно стационарной базы. Применение методики проиллюстрировано на алгоритме обработки серии последовательных кадров приведённом в тексте работы. В тексте кратко описан принцип действия лазерно-оптического измерителя, для которого разработана методика. Описаны методы вычисления продольного, поперечного и вертикального смещения. Порядок использования лазерно-оптического измерителя и применение методики показаны на примере решения задачи высокоточного позиционирования корпуса морского транспортного судна относительно причала при выполнении операции швартовки и погрузо-разгрузочных работ. Результаты работы могут быть использованы при создании высокоточных систем позиционирования и высокоточных систем проводки не только для водного, но и для других видов транспорта (автодорожный, воздушный и железнодорожный). Такие системы решают задачи стабилизация положения подвижных объектов в различных транспортных системах, а также контроль положения. One of the tasks of computer vision is the task of image processing for the contactless measurement of physical quantities. For example, non-contact high-precision measurement of the longitudinal, transverse and vertical displacements of a moving object, taking into account the peculiarities of its size, shape, speed of maneuvering, speed of movement. The proposed work contains a description of an approach to solve such problems. The article proposes a methodic for non-contact measurements of geometric displacements of a moving object relative to a stationary base. The application of the methodic is illustrated on the algorithm for processing a series of sequential frames given in the text of the work. The text briefly describes the principle of operation of the laser-optical meter, for which the methodic has been developed. Methods for calculating the longitudinal, transverse and vertical displacements are described. The order of using the laser-optical meter and the application of the methodic are shown by the example of solving the problem of high-precision positioning of the hull of a sea transport vessel relative to the berth during mooring and loading and unloading operations. The results of the work can be used to create high-precision positioning systems and high-precision guidance systems not only for water transport, but also for other types of transport (road, air and rail). Such systems solve the problem of stabilizing the position of moving objects in various transport systems, as well as position control.

Multi-GNSS Dynamic High Precision Positioning in Urban Environment

2017 ◽  
Author(s):  
Javier M�guez ◽  
Jos� V. Perello Gisbert ◽  
J.A. Garcia-Molina ◽  
Paolo Zoccarato ◽  
Paolo Crosta ◽  
...  
Keyword(s):  
Urban Environment ◽  
High Precision ◽  
Precision Positioning
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