scholarly journals Experimental tests of fuzzy logical temperature controller of an electric resistance chamber furnace

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Milica Jevtić ◽  
Nikola Đorđević ◽  
Zoran Radaković
Keyword(s):  
Fuzzy Controller ◽  
Electrical Engineering ◽  
Experimental Tests ◽  
Electric Resistance ◽  
Plug And Play ◽  
Chamber Furnace ◽  
Similar Construction ◽  
Slope Change ◽  
Temperature Slope ◽  
The One

The paper presents an innovated hardware and software platform for the implementation of the fuzzy controller fortemperature and temperature slope change in an electric resistance chamber furnace. The point of this paper is to present the modernhardware and software tools that we used to lift up the base for continuation of the research done in the laboratory for electricalheating of Faculty of electrical engineering, University of Belgrade, more than 15 years ago. In that period, also the robustness ofcontrol in respect to the amount of load in the furnace was investigated. This paper focuses to the further investigation of therobustness. More precisely, experiments were performed to study if the controller can be applied as "plug and play controller", i.e. ifthe controller can be applied without additional tuning on another furnace with the similar construction in respect to the one where thefuzzy controller is tuned. The tests on two electric chamber furnaces with different rated power and volumes confirm the "plug andplay controller" principal is realistic.

Fuzzy controller for the treadmill speed adaptation system in mechatronic device for gait reeducation

2020 ◽  
Vol 39 (5) ◽  
pp. 7757-7767
Author(s):  
Grzegorz Gembalczyk ◽  
Slawomir Duda ◽  
Eugeniusz Switonski ◽  
Arkadiusz Mezyk
Keyword(s):  
Energy Recovery ◽  
High Efficiency ◽  
Fuzzy Controller ◽  
Electricity Consumption ◽  
Speed Control ◽  
Experimental Tests ◽  
Locomotor Training ◽  
Treadmill Speed ◽  
Weight Support ◽  
Body Weight Support System

Training with use of mechatronic devices is an innovative rehabilitation method for patients with various locomotor dysfunction. High efficiency of training is noted in systems that combine a treadmill or orthosis with a body weight support system. Speed control is a limitation of such rehabilitation systems. In commercially available devices, the treadmill speed is constant or set by the therapist. Even better training results should be obtained for devices in which the speed of the treadmill will be automatically adjusted to the patient walking pace. This study presents a mechatronic device for locomotor training that uses an algorithm to adjust the speed of the treadmill. This speed is controlled with use of a sensor that measures the rope inclination. The end of rope is fastened to the orthopaedic harness. Speed control is realized in such a way that ensures the smallest possible swing angle of the rope. A fuzzy controller was applied to adjust the treadmill speed. The drive system of the treadmill is equipped in a servodrive with PMSM motor and energy recovery module, which allows smooth speed control, limiting acceleration and minimizing electricity consumption. The presented solution was implemented in a real object and subjected to experimental tests.

scholarly journals Experimental investigation of leak hydraulics

2012 ◽  
Vol 15 (3) ◽  
pp. 666-675 ◽  
Author(s):  
M. Ferrante ◽  
C. Massari ◽  
E. Todini ◽  
B. Brunone ◽  
S. Meniconi
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Network Models ◽  
Water Distribution Network ◽  
Experimental Tests ◽  
Pressure Control ◽  
Pipe Material ◽  
Governing Equations ◽  
The One ◽  
Definition Of

In recent decades the hydraulics of leaks, i.e. the definition of the relationships linking the hydraulic quantities in pipes with leaks, has received increasing attention. On the one hand, the definition of the relationship between the leak outflow and the relevant parameters – e.g. the leak area and shape, the pressure inside the pipe and outside the leak, and the pipe material – is crucial for pressure control and inverse analysis techniques. On the other hand, if the effect of the leakage on the governing equations is not taken into account, i.e. the loss of the flow axial momentum is not considered, significant errors can be introduced in the simulation of water distribution systems. In this paper, the governing equations for a pipe with a leak are derived. The basic equations, obtained within different approaches, are presented in a consistent formulation and then compared with the results of some experimental tests. The leak jet angle and other major features of the results are analysed. The estimated values of the parameters can be used in the water distribution network models when pipes with a diffuse leakage are considered.

Fracture Evaluation of the Falling Weight Impact Behaviour of a Basalt/Vinylester Composite Plate through a Multiphase Finite Element Model

2017 ◽  
Vol 754 ◽  
pp. 59-62 ◽  
Author(s):  
Felipe Vannucchi de Camargo ◽  
Ana Pavlovic
Keyword(s):  
Finite Element ◽  
Natural Fibers ◽  
Fem Simulation ◽  
Experimental Tests ◽  
Element Model ◽  
Multiphase Model ◽  
Low Velocity ◽  
Weight Impact ◽  
The One ◽  
Falling Weight

Several investigations regarding the mechanical behaviour of composites reinforced by natural fibers under impact have been realized recently, aiming at achieve a low-weight and resistant design. At the same time, progressively accurate results on numerical simulations have been reached powered by modern Finite Element Method (FEM) approaches for composites; however, demonstrating a faithful indentation pattern is still a challenge. The present work aims at building an impact numerical simulation that exhibits a fracture mechanism exactly like the one seen in experimental tests, also carried in this work, on a Basalt Reinforced Composite Polymer (BRFP) plate subjected to low-velocity falling weight impact (IFW). The FEM simulation describes a multiphase model considering each ply and their inter-layer interactions.

scholarly journals Lithium Niobate Micro-transducers matrix design

2019 ◽  
Vol 281 ◽  
pp. 01001
Author(s):  
Hala El Rammouz ◽  
Farouk Benmeddour ◽  
Jamal Assaad ◽  
Emmanuel Moulin ◽  
Lucie Dupont ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Real Time ◽  
Experimental Tests ◽  
Fabrication Process ◽  
Two Dimensional ◽  
Low Frequencies ◽  
Impedance Analyzer ◽  
The Matrix ◽  
The One ◽  
Matrix Design

In this work, a two-dimensional (2D) Lithium Niobate (LiNbO3) 36°Y-cut micro-transducers (μTs) matrix design is presented. Two main steps define the fabrication process: electrode deposition and photolithography. These steps are preceded by the optical mask conception, which defines the 2D matrix pattern. In contrary to the one element case, this μTs matrix allows to automatically scan a desired structure in real time. The μTs matrix is characterized using an impedance analyzer. Furthermore, the experimental tests carried out in order to demonstrate the matrix functionality at low frequencies [200 - 800] kHz are presented.

Effects of Mechanical Preloads on the Rotordynamic Performance of a Rotor Supported on Three-Pad Gas Foil Journal Bearings

2014 ◽  
Vol 136 (12) ◽  
Author(s):  
Kyuho Sim ◽  
Bonjin Koo ◽  
Jong Sung Lee ◽  
Tae Ho Kim
Keyword(s):  
Test Data ◽  
High Speed ◽  
Experimental Tests ◽  
Journal Bearings ◽  
Test Results ◽  
Performance Measurements ◽  
Displacement Sensors ◽  
Single Top ◽  
Speed Up ◽  
The One

This paper presents the rotordynamic performance measurements and model predictions of a rotor supported on three-pad gas foil journal bearings (GFJBs) with various mechanical preloads. The rotor with its length of 240 mm, diameter of 40 mm, and weight of 19.6 N is supported on two GFJBs and one pair of gas foil thrust bearings (GFTBs), being a permanent magnet rotor of a high speed electric motor. Each bearing pad consisting of a top foil and a bump-strip layer is installed on a lobed bearing housing surface over the arc length of 120 deg along the circumference. Test three-pad GFJBs have four different mechanical preloads, i.e., 0 μm, 50 μm, 70 μm, 100 μm with a common radial nominal clearance of 150 μm. A series of speed-up tests are conducted up to 93 krpm to evaluate the effects of increasing mechanical preloads on the rotordynamic performance. Two sets of orthogonally positioned displacement sensors record the rotor horizontal and vertical motions at the thrust collar and the other end. Test results show that the filtered synchronous amplitudes change little, but the onset speed of subsynchronous motions (OSS) increases dramatically for the increasing mechanical preloads. In addition, test bearings with the 100 μm preload show a higher OSS in load-on-pad (LOP) condition than that in load-between-pads (LBP) condition. A comparison with test results for a one-pad GFJB with a single top foil and bump-strip layer reveals that three-pad GFJB has superior rotordynamic performance to the one-pad one. Finally, the test data benchmark against linear rotordynamic predictions to validate a rotor-GFJB model. In general, predicted natural frequencies of the rotor-bearing system and synchronous rotor motions agree well with test data. However, stability analyses underestimate OSSs recorded during the experimental tests.

Electric Resistivity as Phase Volume Fractions Indicator in Metastable Alloys

2013 ◽  
Vol 738-739 ◽  
pp. 56-61
Author(s):  
Luc Saint Sulpice ◽  
Mohamed Lakrit ◽  
Shabnam Arbab Chirani ◽  
Sylvain Calloch
Keyword(s):  
Volume Fraction ◽  
Experimental Tests ◽  
Transformation Kinetic ◽  
Stress And Strain ◽  
Electric Resistance ◽  
Thermomechanical Loading ◽  
X Ray Diffraction ◽  
X Ray ◽  
History Of ◽  
Metastable Alloys

The microstructure of metastable alloys varies with the thermomechanical history of the material. During a thermomechanical loading, different phases can be present in the material simultaneously. They can be at the origin of macroscopic stress and strain. Consequently, it is important to determine the proportion of each phase to understand the transformation kinetic. However, the techniques usually used to carry out these measurements such as magnetic properties measurements, neutron or X-ray diffraction, are heavy and require a lot of resources. This study, thanks to experimental tests based on electric resistance measurements, permits to determine the volume fraction of the different states present in the material. The study has been realized on a 301 stainless steel in order to take into account the effects of elasticity, transformation and plasticity. Then the volume fraction of the different phases of the material has been determined during transformation with the plasticity presence.

MODELLING OF CHANGES IN SURFACE TOPOGRAPHY IN DRY SLIDING CONDITIONS

Tribologia ◽  
2016 ◽  
Vol 267 (3) ◽  
pp. 61-70
Author(s):  
Andrzej DZIERWA ◽  
Rafał REIZER
Keyword(s):  
Numerical Model ◽  
Surface Topography ◽  
Experimental Tests ◽  
Dry Sliding ◽  
Sectional Area ◽  
Cross Sectional ◽  
Analytical Methodology ◽  
Tribological Tests ◽  
The One ◽  
Worn Surface

Metrology of surface topography is presently so developed that, in some ways, we can predict the surface behaviour of the one part in co-operation with another element. We can single out two main approaches to the modelling of surface texture. In the first one, the modelling does not take into account the conditions of the technological or operational formation of the surface, while in the second, more complicated approach, modelling takes into account the real conditions of forming the surface. In this work, tribological tests were carried out in dry sliding conditions, and the analytical methodology of wear or worn surface. Approximations obtained using the second approach are usually worse than those using the first method [L. 8–10]. In the presented work, tribological tests in dry sliding conditions were carried out, and a numerical model to determine the cross-sectional area of wear in presented conditions was produced, and the results obtained using modelling and experimental tests were compared.

scholarly journals MENINGKATKAN MOTIVASI DAN PENCAPAIAN HASIL BELAJAR MAHASISWA DALAM MATAKULIAH BAHASA INGGRIS TEKNIK

2007 ◽  
Vol 1 (1) ◽  
pp. 33
Author(s):  
Jufrizal Jufrizal ◽  
Elisna Elisna
Keyword(s):  
Action Research ◽  
Learning Process ◽  
Teaching Method ◽  
Electrical Engineering ◽  
Study Programs ◽  
Technical Study ◽  
The One ◽  
Teaching Learning ◽  
Academic Year ◽  
English Subject

The lack of motivation and result of teaching-learning process obtained by the students are the problems faced by technical study programs, including the one at the Faculty of Engineering of Universitas Negeri Padang. This paper discusses the actions done through classroom action research as the attempt to raise the students’ motivation and the result of teaching learning process. The object of the research was the students of D3 regular program of electrical engineering in the academic year of 2005/2006. The result of the research shows that a set of actions, namely: (i) attracting the students to discuss the nature of Technical English subject; (ii) improving and correcting the students’ attitude and perception towards Technical English subject; (iii) applying teaching method and techniques based on natural-constructivism approach; (iv) varying techniques and materials of teaching; (v) using modern equipments, materials, instruments, and facilities effectively, could raise the students’ motivation and their result of teaching-learning process of Technical English subject.

scholarly journals Plug-and-Play Few-shot Object Detection with Meta Strategy and Explicit Localization Inference

2021 ◽  
Author(s):  
Junying Huang ◽  
Fan Chen ◽  
Liang Lin ◽  
dongyu zhang
Keyword(s):  
Object Detection ◽  
Fine Tuning ◽  
The Novel ◽  
Plug And Play ◽  
Tuning Method ◽  
One Step ◽  
Tuning Process ◽  
General Object ◽  
The One ◽  
Parallel Techniques

Aiming at recognizing and localizing the object of novel categories by a few reference samples, few-shot object detection is a quite challenging task. Previous works often depend on the fine-tuning process to transfer their model to the novel category and rarely consider the defect of fine-tuning, resulting in many drawbacks. For example, these methods are far from satisfying in the low-shot or episode-based scenarios since the fine-tuning process in object detection requires much time and high-shot support data. To this end, this paper proposes a plug-and-play few-shot object detection (PnP-FSOD) framework that can accurately and directly detect the objects of novel categories without the fine-tuning process. To accomplish the objective, the PnP-FSOD framework contains two parallel techniques to address the core challenges in the few-shot learning, i.e., across-category task and few-annotation support. Concretely, we first propose two simple but effective meta strategies for the box classifier and RPN module to enable the across-category object detection without fine-tuning. Then, we introduce two explicit inferences into the localization process to reduce its dependence on the annotated data, including explicit localization score and semi-explicit box regression. In addition to the PnP-FSOD framework, we propose a novel one-step tuning method that can avoid the defects in fine-tuning. It is noteworthy that the proposed techniques and tuning method are based on the general object detector without other prior methods, so they are easily compatible with the existing FSOD methods. Extensive experiments show that the PnP-FSOD framework has achieved the state-of-the-art few-shot object detection performance without any tuning method. After applying the one-step tuning method, it further shows a significant lead in both efficiency, precision, and recall, under varied few-shot evaluation protocols.

Framed Harvesters for Collecting Energy From Vibrations in Industrial Plants

2019 ◽  
Author(s):  
Alberto Doria
Keyword(s):  
Sensitivity Analysis ◽  
Experimental Tests ◽  
Industrial Plants ◽  
Tuning Method ◽  
The One ◽  
Piezoelectric Harvester

Abstract The idea of increasing the number of resonance conditions of a cantilever piezoelectric harvester by coupling the harvester with a frame that surrounds the harvester’s body is presented and discussed. Experimental tests on prototypes show that it is possible to design framed harvesters able to generate significant powers at two frequencies. Since the framed harvesters will be used for harvesting energy from periodic vibrations characterized by multiple harmonics, a tuning method is needed. For this reason a numerical sensitivity analysis is performed to analyze the effect on harvester tuning of small masses mounted on the frame. A prototype tuned to 40 and 80 Hz is developed and tested, its performance is compared with the one of a system of two simple harvesters tuned to the same frequencies.

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