scholarly journals KVL and KCL verification by cotton conductive yarn resistor instead of carbon resistor fixation with Ag nanoparticles for sustainable e-textiles application

2020 ◽  
Vol 6 (4) ◽  
pp. 133-139
Author(s):  
Redwanul Hasan ◽  
Minhazul Islam ◽  
Sazid Hossain
Keyword(s):  
Ag Nanoparticles ◽  
Material Science ◽  
Closed Loop ◽  
Research Work ◽  
Orthodox Theory ◽  
Carbon Resistor ◽  
Conductive Yarn

This paper parades the effectiveness of conductive yarn resistor instead of carbon resistor by verifying the Kirchhoff’s voltage (KVL) & current (KCL) law. This research work enlightens about the sustainability of e-textiles on account of presenting characteristics of this conductive yarn resistor. Resistor is one of the most useful materials in the electrical laboratories. Generally resistor is made by carbon. Using carbon resistor is pernicious for our environment, society & cost. It is known that sustainability is the concerned area at present. Sustainable e-textile is one of the major need in material science .This quest indicates that point to boggle sustainable e-textile by inventing conductive yarn resistor verifying with most orthodox theory of Kirchhoff’s voltage & current laws. KVL and KCL are the most prominent theory in electrical science. Summation of KVL and KCL will be zero in any closed loop in this theory. The summation of KVL is also zero here and summation of KCL is also zero here. It can justify Kirchoff’s KVL & KCL theory.

Numerical study of multi-dimensional hyperbolic telegraph equations arising in nuclear material science via an efficient local meshless method

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Imtiaz Ahmad ◽  
Aly R. Seadawy ◽  
Hijaz Ahmad ◽  
Phatiphat Thounthong ◽  
Fuzhang Wang
Keyword(s):  
Meshless Method ◽  
Material Science ◽  
Numerical Study ◽  
Research Work ◽  
Time Integration ◽  
Three Dimensional ◽  
Nuclear Material ◽  
Telegraph Equations ◽  
Model Equations ◽  
Derivatives Of

Abstract This research work is to study the numerical solution of three-dimensional second-order hyperbolic telegraph equations using an efficient local meshless method based on radial basis function (RBF). The model equations are used in nuclear material science and in the modeling of vibrations of structures. The explicit time integration technique is utilized to semi-discretize the model in the time direction whereas the space derivatives of the model are discretized by the proposed local meshless procedure based on multiquadric RBF. Numerical experiments are performed with the proposed numerical scheme for rectangular and non-rectangular computational domains. The proposed method solutions are converging quickly in comparison with the different existing numerical methods in the recent literature.

scholarly journals Effect of Stretching on Thermal Behaviour of Electro-Conductive Weft-Knitted Composite Fabrics

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 249
Author(s):  
Md. Reazuddin Repon ◽  
Ginta Laureckiene ◽  
Daiva Mikucioniene
Keyword(s):  
Heat Generation ◽  
Research Work ◽  
Sem Images ◽  
Fabric Structure ◽  
Highly Sensitive ◽  
Multifilament Yarns ◽  
Knitted Structure ◽  
Composite Fabrics ◽  
Different Levels ◽  
Conductive Yarn

This experiment presents a study carried out on the electric charge passing textiles for heat production in compression weft-knitted composite fabrics used for medical purposes. The aim was to flourish compression support of knitted structure with integrated highly sensitive metal (silver) coated polyamide multifilament yarns and to evaluate its heat origination attributes after stretching in different levels as well as changes of the temperature during the time. A flat double needle-bed knitting machine was utilized to fabricate the selected specimens together with elastomeric inlay-yarn incorporated into the structure for compression generation and silver coated polyamide yarn laid as ground yarn in a plated structure for heat generation. Six different variants depending on the metal coated yarn amount used and the fabric structure along with two types of the conductive yarn linear density were fabricated for this research work. Scanning electron microscope (SEM) images were preoccupied to show the morphology of conductive yarn and thermal pictures were captured to study the evenness of the heat over the surface of composite fabrics depending on conductive yarn distribution in the pattern repeat. The temperature profile of fabricated composite fabrics and comparison of the heat generation by specimens after stretching in different levels was studied.

Dynamics and Control of Instrumented Harmonic Drives

1995 ◽  
Vol 117 (1) ◽  
pp. 15-19 ◽  
Author(s):  
H. Kazerooni
Keyword(s):  
Transfer Function ◽  
Closed Loop ◽  
Research Work ◽  
High Ratio ◽  
Output Shaft ◽  
Harmonic Drive ◽  
Dynamics And Control ◽  
Radial Forces ◽  
And Control ◽  
Stationary Component

Since torque in harmonic drives is transmitted by a pure couple, harmonic drives do not generate radial forces and therefore can be instrumented with torque sensors without interference from radial forces. The installation of torque sensors on the stationary component of harmonic drives (the Flexipline cup in this research work) produce backdrivability needed for robotic and telerobotic compliant maneuvers [3, 4, 6]. Backdrivability of a harmonic drive, when used as torque increaser, means that the output shaft can be rotated via finite amount of torque. A high ratio harmonic drive is non-backdrivable because its output shaft cannot be turned by applying a torque on it. This article first develops the dynamic behavior of a harmonic drive, in particular the non-backdrivability, in terms of a sensitivity transfer function. The instrumentation of the harmonic drive with torque sensor is then described. This leads to a description of the control architecture which allows modulation of the sensitivity transfer function within the limits established by the closed-loop stability. A set of experiments on an active hand controller, powered by a DC motor coupled to an instrumented harmonic drive, is given to exhibit this method’s limitations.

scholarly journals A Study of the Dynamics and Control of the Model IV Fluidized Catalytic Cracking Process

2014 ◽  
Vol 5 (1) ◽  
pp. 1-26
Author(s):  
Dhia Yasser Aqar
Keyword(s):  
Flow Rate ◽  
Catalytic Cracking ◽  
Closed Loop ◽  
Research Work ◽  
Economic Benefits ◽  
Open Loop ◽  
Internal Model Control ◽  
Oil Refineries ◽  
Bed Temperature ◽  
Model Control

Fluid catalytic cracking (FCC) is one of the most important chemical units in oil refineries due to its economic benefits. This research work concentrates on improving the control system of the Model IV FCC unit where dynamic modeling and the controllability based on the McFarlane et al. (1993) model. Different open-loop tests were carried out in the wash oil flow rate (F1) and the furnace fuel flow rate (F5) to find the FCC models using Sundaresan and Krishnaswamy (S&K) and fraction incomplete response (FIR) methods. The riser temperature (Tr) and the regenerator bed temperature (Tg) were chosen as the control variables while (F1 and F5) were selected as the corresponding manipulated variables based on the relative gain array (RGA).  PI controller tuning parameters were evaluated using the internal model control (IMC) method and different closed-loop control responses were examined for both set point tracking and disturbance rejection changes. Additional adjustments to the IMC filter constant were employed to further improve the closed loop responses for the system.

System Identification and IMC-Based PID Control of a Reactive Distillation Process: A Case Study of n-Butyl Acetate Production

2017 ◽  
Vol 31 ◽  
pp. 104-119 ◽  
Author(s):  
Abdulwahab Giwa ◽  
John Olusoji Owolabi ◽  
Saidat Olanipekun Giwa
Keyword(s):  
Transfer Function ◽  
Pid Control ◽  
Butyl Acetate ◽  
Closed Loop ◽  
Reactive Distillation ◽  
Research Work ◽  
Absolute Error ◽  
Distillation Process ◽  
Function Model ◽  
Input Variables

The identification of a reactive distillation system for the production of n-butyl acetate from the esterification reaction between acetic acid and n-butanol has been carried out in this research work. In order to achieve the aim of the research work, a prototype plant of the process was developed using ChemCAD from which dynamics data were generated upon applications of step changes to the reboiler duty and the reflux ratio, which were the input variables of the system. Thereafter, the transfer function of the process, later represented in Simulink environment, was formulated using the dynamics data and with the aid of MATLAB. The simulation of the transfer function model of the system was also carried out for open loop by applying step changes unto the input variables using the developed Simulink model of the system. Thereafter, the closed-loop control system developed also in Simulink environment was simulated by applying step changes to the set-point variable, which was the bottom mole fraction of n-butyl acetate. The results obtained from the simulation of the prototype plant of the reactive distillation process showed ChemCAD to be a powerful tool for steady state and dynamics prototype plant development. Furthermore, good representation and stability were also observed to exist in the system from the formulation and the simulation of the transfer function model of the process, which were carried out with the aid of MATLAB/Simulink. Moreover, the selection of appropriate closed-loop time constant contained in the tuning parameter formulas of IMC-based control system showed that the value suggested by Rivera et al. [1] was very good for this system, compared to those of Chien and Fruehauf [2] and Skogestad [3], because it could give closed-loop dynamic response with comparatively very low values of integral squared error (ISE), integral absolute error (IAE) and integral time absolute error (ITAE) for both proportional-integral (PI) and proportional-integral-derivative (PID) control systems. In addition, the comparison made between the IMC-based tuning approach and other ones (Cohen-Coon, Tyreus-Luyben and Ziegler-Nichols) considered in this work made it known that IMC-based tuning technique was the best among all those considered because its ISE, IAE and ITAE were found to be the lowest for both PI-and PID-controlled cases simulated.

Position and Speed Double Closed Loop Control Performance of Electro-Hydraulic Actuator System Research Based on AMESim

2015 ◽  
Vol 779 ◽  
pp. 220-225
Author(s):  
Jing Hu ◽  
Ming Liu ◽  
Wei Li
Keyword(s):  
Control Strategy ◽  
System Performance ◽  
Closed Loop ◽  
Research Work ◽  
Speed Control ◽  
Simulation Software ◽  
Good Effect ◽  
Stable Operation ◽  
Hydraulic Actuator ◽  
Actuator System

In the paper, we research on a preparatory electro-hydraulic actuator product, using the simulation software AMESim to research work to analyze the system performance. We research position in closed loop servo actuator system, generally only considered the requirements of the position. While the speed trajectory and precision control did not do high demand. The position of the system by increasing the speed control strategy module, the system meets the requirements of the position. At the same time, we can achieve speeds start-up operation, stable operation and stopped operation of the three phases according to the requirement following a given trajectory; simultaneously can carry out detailed system performance analysis and research. Simulation results show that increasing position speed control strategy module of the system get very good effect. It can realize the speed control system and satisfy the system output displacement and speed steady-state performance and dynamic response.

Study on Different Techniques of Fabricating Conductive Fabrics for Developing Wearable Electronics

2015 ◽  
Vol 19 (4) ◽  
pp. 11-23 ◽  
Author(s):  
L Ashok Kumar
Keyword(s):  
Research Work ◽  
Interdisciplinary Studies ◽  
Wearable Electronics ◽  
Test Rig ◽  
Electronic Products ◽  
Conductive Fabric ◽  
User Acceptability ◽  
Wearable Electronic ◽  
Different Diameters ◽  
Conductive Yarn

In recent years, interdisciplinary studies have been the mainstream in research discourses and practices. Depending on the degree of integration, the combination of electronics and textiles can be divided into three categories: wearable electronics, textronics and fibertronics. This paper discusses the development of cotton-wrapped nichrome yarn, copper core conductive yarn and optical core conductive yarn in different diameters for the production of nichrome fabric, copper core conductive fabric, optical core conductive fabric and teleintimation fabric. The yarn and the fabric were tested by a test rig especially developed for this research work. This work provides a methodology of developing conductive yarn and fabric for the development of wearable electronic products in terms of user acceptability.

scholarly journals A Foreword from the Editor-in-Chief

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Ali Durmus
Keyword(s):  
Material Science ◽  
Research Work ◽  
Polymeric Materials ◽  
Theoretical Research ◽  
Original Research ◽  
Metallic Materials ◽  
Academic Journal ◽  
Research Papers ◽  
Metallic Material ◽  
Technical Platform

I am very happy to announce that the Non-Metallic Material Science (NMMS) which is an open access and multidisciplinary academic journal and a technical platform bringing out original research work and covering all aspects of non-metallic materials, has started its publication journey by the Bilingual Publishing Co., in 2019. The scope of the journal is devoted to publish original experimental and theoretical research papers, reviews, short communications, and technical notes mainly in the areas of polymeric materials, composites and hybrid materials, inorganic and carbon-based materials. 

Influences of Closed Loop Control Componentson the Performance of Ultra-Precision Machines

2014 ◽  
Vol 625 ◽  
pp. 207-212
Author(s):  
Christian Brecher ◽  
Dominik Lindemann ◽  
Christian Wenzel
Keyword(s):  
Closed Loop ◽  
Research Work ◽  
Step Response ◽  
Precision Machining ◽  
Closed Loop Control ◽  
Servo Drive ◽  
Loop Control ◽  
Ultra Precision ◽  
Servo Drives ◽  
Accuracy And Repeatability

At Fraunhofer IPT a test bench has been setup to analyze closed loop control components and their interfaces with focus on their application in ultra-precision machining applications. This paper will present the results of the analysis of feedback and servo drive systems and will give a close inside on the influences of linear scales and analog and digital servo drives for applications in ultra-precision machining. The performed measurements include the analysis of the position accuracy and repeatability (step response test) as well as the determination of the dynamic frequency characteristics (stiffness / compliance) of an air bearing axis. With respect to the aforementioned measurements the tests have been performed under the variation of linear scales (vendor, pitch, signal, sampling frequency, etc.) and servo drives (vendor, switching or linear amplifiers, PWM frequency, control architecture, DC bus voltage, etc.). The paper will give a summary on the results of the analyzed topics, carefully chosen regarding their relevance to ultra-precision machining. Finally, a short outlook to future research work concerning the analysis of CNC controls will be given.

Development of High Bandwidth Flexure Based Stage for Nanopositioning Applications

2018 ◽  
Vol 24 (8) ◽  
pp. 5989-5993 ◽  
Author(s):  
T. Narendra Reddy ◽  
S. N Vithun ◽  
Prakash Vinod ◽  
Shrikantha S Rao ◽  
Mervin Herbert
Keyword(s):  
System Performance ◽  
High Speed ◽  
Closed Loop ◽  
Materials Science ◽  
Research Work ◽  
Structural Vibrations ◽  
Closed Loop Systems ◽  
High Bandwidth ◽  
Optical Focusing ◽  
And Control

Micro and Nanopositioning systems are widely used in semiconductor, optics, materials science, photonics packaging, optical focusing objectives etc. This paper is focused on development of high bandwidth flexure based stage for nanopositioning requirements. The speed, nano-metric motions and positioning accuracy are limited based on the structural vibrations of the flexure based nanopositioning, non-linear characteristics of the piezo-actuators and control system performance. The research work carried out includes design of complaint mechanisms, fabrication of flexure stages and implementation of closed loop systems to achieve high bandwidth positioning applications. The developed high speed and high bandwidth nanopositioning system are tested for accuracy, linearity and cross talk motions for Nanopositioning applications.

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