Design methodology for fully dynamic-controlled polynomial profiles and reduced tracking error in CNC machines

2010 ◽  
Vol 51 (5-8) ◽  
pp. 723-737 ◽  
Author(s):  
Jesus Rooney Rivera-Guillen ◽  
Rene de Jesus Romero-Troncoso ◽  
Roque Alfredo Osornio-Rios ◽  
Arturo Garcia-Perez ◽  
Gilberto Herrera-Ruiz
Keyword(s):  
Design Methodology ◽  
Tracking Error ◽  
Cnc Machines ◽  
Polynomial Profiles

Singularity avoidance of 6R decoupled manipulator using improved Gaussian distribution damped reciprocal algorithm

2017 ◽  
Vol 44 (3) ◽  
pp. 324-332 ◽  
Author(s):  
Hong-Xin Cui ◽  
Ke Feng ◽  
Huan-Liang Li ◽  
Jin-Hua Han
Keyword(s):  
Gaussian Distribution ◽  
Trajectory Tracking ◽  
Design Methodology ◽  
Tracking Error ◽  
Tracking Accuracy ◽  
Singularity Avoidance ◽  
Content Type ◽  
Simulation And Experiment ◽  
The Common ◽  
Important Significance

Purpose To improve the trajectory tracking accuracy of 6R decoupled manipulator in singularity region, this paper aims to propose a singularity avoidance algorithm named “singularity separation plus improved Gaussian distribution damped reciprocal”. Design/methodology/approach The manipulator is divided into forearm and wrist, and the corresponding singularity factors are separated based on kinematics calculation. Singularity avoidance is achieved by replacing the common reciprocal with the improved Gaussian distribution damped reciprocal. Findings Compared with common damped reciprocal algorithm and classical Gaussian distribution algorithm, the continuity of the proposed algorithm is improved and the tracking error is minimized. The simulation and experiment results prove effectiveness and practicability of the proposed algorithm. Originality/value This study has an important significance to improve the efficiency and operation accuracy of 6R decoupled manipulator.

Evaluating the tracking performance and tracking error of New Zealand exchange traded funds

2017 ◽  
Vol 29 (3) ◽  
pp. 443-462 ◽  
Author(s):  
Jun Chen ◽  
Yi Chen ◽  
Bart Frijns
Keyword(s):  
New Zealand ◽  
Design Methodology ◽  
Tracking Error ◽  
Cointegration Analysis ◽  
Tracking Performance ◽  
Exchange Traded Funds ◽  
Frequency Tracking ◽  
Content Type ◽  
Regression Methods ◽  
Daily Frequency

Purpose The aim of this study is to examine the tracking performance and tracking error (TE) of New Zealand exchange traded fsunds (ETFs). Design/methodology/approach The authors use regression methods and cointegration analysis to examine tracking performance. Multivariate regressions are used to examine the determinants of TE. Findings At the daily frequency, the authors observe that the ETFs have substantially different exposures to their underlying indexes from what they should be, which is confirmed by cointegration analysis. At the monthly frequency, tracking performance improves but still shows significant differences between the ETF and its underlying index. When the authors examine the TEs of the ETFs, the authors observe that these are substantial and that there is considerable variation in TE. Regression analysis shows that both characteristics of the ETF and the constituents of the index the ETF tracks, as well as the volatility of the underlying benchmark are determinants of the TE of the ETFs. Originality/value This is the first study to examine New Zealand-based ETFs. The findings contribute to understanding the performance of these ETFs and are of relevance to academics, investors and the ETF provider.

A Robust Discrete Time Adaptive Servo

1988 ◽  
Vol 110 (2) ◽  
pp. 189-196 ◽  
Author(s):  
Nader Sadegh ◽  
Robert O. Horowitz
Keyword(s):  
Control Systems ◽  
High Frequency ◽  
Design Methodology ◽  
A Priori ◽  
Tracking Error ◽  
Step Response ◽  
Reference Trajectory ◽  
Persistent Excitation ◽  
Resonance Modes ◽  
Reference Input

This paper deals with the robustness issues associated with the design of an adaptive control servo in the presence of linear unmodeled plant dynamics. In particular, a design methodology for trajectory following control systems is presented which guarantees the boundness of the tracking error without requiring persistent excitation of the reference input. The tracking error bound is calculated as a function of the reference trajectory, using a-priori knowledge of the step response of the plant. An application of this technique to a positioning servo with an unknown or slowly varying inertia load and high frequency unmodeled resonance modes is included.

Accuracy in the design methodology of abstracts

2003 ◽  
Vol 84 (2) ◽  
pp. 303-303
Author(s):  
Maurice Bernaiche ◽  
Michael Andary
Keyword(s):  
Design Methodology

Tourism awareness as a tourism development strategy: status of the issue

2020 ◽  
Vol 13 (9) ◽  
Author(s):  
M.I. Rosas-Jaco ◽  
S.X. Almeraya-Quintero ◽  
L.G. Guajardo-Hernández
Keyword(s):  
Development Strategy ◽  
Design Methodology ◽  
Local Development ◽  
Local Population ◽  
Host Community ◽  
Government Policies ◽  
Training Manual ◽  
Environmental Development ◽  
Main Engine ◽  
The Relationship

Objective: Tourism has become the main engine of economic, social and environmental development in several countries, so promoting tourism awareness among tourists and the local population should be a priority. The present study aims to suggest a status of the research carried out on the topic of tourism awareness. Design / methodology / approach: The type of analysis is through a retrospective and exploratory bibliometric study. The analysis materials were scientific articles and a training manual published between 2000 and 2020, registered by Scopus, Emerald insight and Dialnet, using “tourism awareness” as the keyword. Results: When considering the three senses in which tourism awareness ought to operate, it is concluded that studies are more focused on the relationship and contact of the host community with the tourist. It is observed that four out of six articles in this sense consider that education, training, and government policies around tourism awareness should be developed in a better way in the destinations, in order to be an element that contributes to the development of communities and reduces poverty in developing countries. Study limitations / implications: It is considered a limitation not to include thesis dissertations. Findings / conclusions: It is necessary to make visible the importance of tourism awareness as a local development strategy for communities, in addition to including tourism awareness on the part of tourists.

Assessment of land-use change in coastal areas through geographical information systems

2020 ◽  
Vol 13 (10) ◽  
Author(s):  
Verónica Lango-Reynoso ◽  
Karla Teresa González-Figueroa ◽  
Fabiola Lango-Reynoso ◽  
María del Refugio Castañeda-Chávez ◽  
Jesús Montoya-Mendoza
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Geographical Information Systems ◽  
Design Methodology ◽  
Scientific Information ◽  
Coastal Ecosystems ◽  
Coastal Areas ◽  
Geographical Information ◽  
Coastal Zones ◽  
Computer Based

Objective: This article describes and analyzes the main concepts of coastal ecosystems, these as a result of research concerning land-use change assessments in coastal areas. Design/Methodology/Approach: Scientific articles were searched using keywords in English and Spanish. Articles regarding land-use change assessment in coastal areas were selected, discarding those that although being on coastal zones and geographic and soil identification did not use Geographic Information System (GIS). Results: A GIS is a computer-based tool for evaluating the land-use change in coastal areas by quantifying variations. It is analyzed through GIS and its contributions; highlighting its importance and constant monitoring. Limitations of the study/Implications: This research analyzes national and international scientific information, published from 2007 to 2019, regarding the land-use change in coastal areas quantified with the digital GIS tool. Findings/Conclusions: GIS are useful tools in the identification and quantitative evaluation of changes in land-use in coastal ecosystems; which require constant evaluation due to their high dynamism.

Multitemporal distribution analysis of Dodonaea viscosa (L.) Jacq. by remote sensing in Durango, Mexico

2020 ◽  
Vol 13 (8) ◽  
Author(s):  
Marco, A. Márquez-Linares ◽  
Jonathan G. Escobar--Flores ◽  
Sarahi Sandoval- Espinosa ◽  
Gustavo Pérez-Verdín
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Design Methodology ◽  
Supervised Classification ◽  
Satellite Images ◽  
Ground Cover ◽  
Distribution Analysis ◽  
Dodonaea Viscosa ◽  
Artificial Neural ◽  
Landsat Satellite

Objective: to determine the distribution of D. viscosa in the vicinity of the Guadalupe Victoria Dam in Durango, Mexico, for the years 1990, 2010 and 2017.Design/Methodology/Approach: Landsat satellite images were processed in order to carry out supervised classifications using an artificial neural network. Images from the years 1990, 2010 and 2017 were used to estimate ground cover of D. viscosa, pastures, crops, shrubs, and oak forest. This data was used to calculate the expansion of D. viscosa in the study area.Results/Study Limitations/Implications: the supervised classification with the artificial neural network was optimal after 400 iterations, obtaining the best overall precision of 84.5 % for 2017. This contrasted with the year 1990, when overall accuracy was low at 45 % due to less training sites (fewer than 100) recorded for each of the land cover classes.Findings/Conclusions: in 1990, D. viscosa was found on only five hectares, while by 2017 it had increased to 147 hectares. If the disturbance caused by overgrazing continues, and based on the distribution of D. viscosa, it is likely that in a few years it will have the ability to invade half the study area, occupying agricultural, forested, and shrub areas

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