scholarly journals Quadcopters Testing Platform for Educational Environments

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4134
Author(s):  
Uriel Veyna ◽  
Sergio Garcia-Nieto ◽  
Raul Simarro ◽  
Jose Vicente Salcedo
Keyword(s):  
Undergraduate Students ◽  
Degrees Of Freedom ◽  
Test Bench ◽  
Controller Design ◽  
Safety Level ◽  
Advanced Level ◽  
Educational Environments ◽  
Open Test ◽  
Basic Level ◽  
Three Degrees Of Freedom

This work focuses on the design and construction of an experimental test bench of three degrees of freedom with application in educational environments. It is constituted by a gyroscopic structure that allows the movements of a quadcopter to analyze the control systems. In this context, the main features of the mechanical and electronic design of this prototype are described. At the same time, the main characteristics with respect to existing platforms are highlighted in aspects such as: system autonomy, cost, safety level, operation ranges, experimental flexibility, among others. The possible controller design approaches for quadcopter stabilization can extend to many basic and advanced techniques. In this work, to show the operation and didactic use of the platform, the development of the controller for tilt angle stabilization under two different approaches are presented. The first approach is through PID control, oriented for undergraduate students with basic level in control theory. The second approach is by means of State Feedback, oriented to students with more advanced level in this field. The result of this work is an open test bench, enabled for the experimentation of control algorithms using Matlab-Simulink.

A novel 3-DOF translational parallel robot and its fuzzy controller design

2021 ◽  
pp. 1-14
Author(s):  
Tianxu Li ◽  
Mingde Gong ◽  
Kongming Hu ◽  
Lijuan Zhao ◽  
Baoqiang Zhao
Keyword(s):  
Pid Controller ◽  
Degrees Of Freedom ◽  
Fuzzy Controller ◽  
Controller Design ◽  
Screw Theory ◽  
Parallel Robot ◽  
Servo Control ◽  
Control Performance ◽  
Three Degrees Of Freedom ◽  
Better Than

In this paper, a novel three-degrees-of-freedom (3-DOF) parallel robot is designed, which can only move in three translational directions. It avoids the difficulty in the solution for forward kinematics of the parallel robot. The robot containing only lower pairs (P and R) has a simple mechanism. The characteristic that the parallel robot has only three translational degrees of freedom can be proved by the screw theory and the DOF can be got by the formula of calculating the DOF of space mechanism. The kinematics and workspace of the parallel robot is analyzed through calculation and simulation. In order to obtain better servo control performance, the PMSM fuzzy controller is designed. The analysis and simulation results show that the mechanism design of the parallel robot is reasonable, and the effect of fuzzy controller is better than the ordinary PID controller.

scholarly journals Identifying Vocabulary Learning Strategies Used by Undergraduate Students in Different Proficiency Levels

2021 ◽  
Vol 14 (1) ◽  
pp. 8
Author(s):  
Nurmala Hendrawaty ◽  
Ayu Bandu Retnomurti
Keyword(s):  
Learning Strategies ◽  
Undergraduate Students ◽  
Vocabulary Learning ◽  
Descriptive Statistics ◽  
Advanced Level ◽  
Proficiency Levels ◽  
Acquisition Strategies ◽  
Vocabulary Learning Strategies ◽  
Basic Level ◽  
Competency Level

The aim of this study is to discover diverse vocabulary learning strategies among undergraduate students in three different competence levels (basic, intermediate, and advanced) who are enrolled in the Vocabulary course at Universitas Indraprasta PGRI in semester III. In this study, determination, social, memory, cognitive, and metacognitive methods were used to learn the language. Schmitt's Vocabulary Learning Strategies Questionnaire was used to collect data (VLSQ). Thirty undergraduate students were chosen on the basis of their competence levels. The results of descriptive statistics revealed that most undergraduate students used a medium strategy. The basic level had a mean score of 2.91, the intermediate level of 3.10, and the advanced level of 3.44. It was evident that the more vocabulary acquisition strategies a student used, the greater his or her competency level became. When it came to the most and least frequently utilized strategies by undergraduate students, metacognitive and determination were the most commonly employed techniques across three levels. However, the least frequent strategies of each level were different. Cognitive was slightly used by basic undergraduate students. Memory was the least employed by intermediate undergraduate students, and social was the fewest strategies implemented by advanced undergraduate students. This study revealed that the development of vocabulary learning strategies could increase EFL undergraduate students’ proficiency levels significantly.

scholarly journals Ozone measurement practice in the laboratory using Schönbein's method

2019 ◽  
Author(s):  
Ignacio Arturo Ramirez-Gonzalez ◽  
Juan Antonio Añel ◽  
Antonio Cid-Samamed
Keyword(s):  
19Th Century ◽  
Undergraduate Students ◽  
Traditional Method ◽  
First Year ◽  
Advanced Level ◽  
Scientific Methods ◽  
Communication Campaign ◽  
Ozone Measurement ◽  
The 19Th Century ◽  
Basic Level

Abstract. We present a laboratory technique that can be used to measure tropospheric ozone, following a traditional method developed by Christian Friedrich Schönbein in the 19th century. The practice is described with two levels of complexity (the advanced level includes the production in the lab of paper strips as they were produced in the 19th century while the basic level does not) and is suitable for use by both high-school and first-year undergraduate students. The overall aim is to familiarise students with both the scientific methods involved and the related concepts of pollution and ozone. This technique was developed and presented in high schools during a communication campaign to celebrate the annual Galician Scientist Day and based on the detected need for a better understanding of the problems of climate change and pollution.

scholarly journals Active Disturbance Rejection for a Three Degrees of Freedom Gyroscope

2018 ◽  
Vol 51 (13) ◽  
pp. 372-377 ◽  
Author(s):  
Juan E. Andrade García ◽  
Alejandra Ferreira de Loza ◽  
Luis T. Aguilar ◽  
Ramón I. Verdés
Keyword(s):  
Disturbance Rejection ◽  
Degrees Of Freedom ◽  
Active Disturbance Rejection ◽  
Three Degrees Of Freedom

scholarly journals Cyclic Deformation of Microcantilevers Using In-Situ Micromanipulation

2021 ◽  
Author(s):  
A. H. S. Iyer ◽  
M. H. Colliander
Keyword(s):  
Degrees Of Freedom ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Structural Components ◽  
Cyclic Testing ◽  
Phase Boundaries ◽  
Bulk Specimen ◽  
Arbitrary Position ◽  
Three Degrees Of Freedom

Abstract Background The trend in miniaturisation of structural components and continuous development of more advanced crystal plasticity models point towards the need for understanding cyclic properties of engineering materials at the microscale. Though the technology of focused ion beam milling enables the preparation of micron-sized samples for mechanical testing using nanoindenters, much of the focus has been on monotonic testing since the limited 1D motion of nanoindenters imposes restrictions on both sample preparation and cyclic testing. Objective/Methods In this work, we present an approach for cyclic microcantilever bending using a micromanipulator setup having three degrees of freedom, thereby offering more flexibility. Results The method has been demonstrated and validated by cyclic bending of Alloy 718plus microcantilevers prepared on a bulk specimen. The experiments reveal that this method is reliable and produces results that are comparable to a nanoindenter setup. Conclusions Due to the flexibility of the method, it offers straightforward testing of cantilevers manufactured at arbitrary position on bulk samples with fully reversed plastic deformation. Specific microstructural features, e.g., selected orientations, grain boundaries, phase boundaries etc., can therefore be easily targeted.

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