This paper concerns detection of solid particles suspended in conductive media by impedance technique. The technique is based on changes in impedance measured between two electrodes placed across a given volume of con...
This paper concerns detection of solid particles suspended in conductive media by impedance technique. The technique is based on changes in impedance measured between two electrodes placed across a given volume of conducting medium. It presents a methodology for modelling and investigation of the feasibility of such a technique for particle detection by 2D finite element (FE) field modelling. This is based on modelling and computation of electric field distribution between the above electrodes. It establishes the modelling approach, the complexity involved and justifies the need for modelling in 3D to incorporate some of the effects that cannot be taken into account in 2D models. It reports on the modelling investigation for a specific case of detecting, by impedance technique cholesterol particles suspended in human blood and points to a possible instrument for non-invasive measurement of blood cholesterol level.
The world is still struggling with a substantial loss of human life as a outcome caused by COVID-19. For futuristic purpose of wellbeingness of human life it’s important to study such type of pathogen in an authentic...
The world is still struggling with a substantial loss of human life as a outcome caused by COVID-19. For futuristic purpose of wellbeingness of human life it’s important to study such type of pathogen in an authentic manner using mathematicalmodelling. In this study some mathematical prediction models based on data from nations, including China, Italy, France, India, Iran and Turkey are reviewed. It was observed that researchers presented a model in number of ways for projecting COVID findings. It was also observed that result from trained data correlate to a great extent albeit not fully to the test data. Finally, several potential futuristic techniques for improving model efficacy are proposed.
In this paper a suggested control system for a solenoid coil is proposed. This control model is based on the employment of the electrical part of the solenoid with a conventional proportional, integral, and derivative...
In this paper a suggested control system for a solenoid coil is proposed. This control model is based on the employment of the electrical part of the solenoid with a conventional proportional, integral, and derivative (PID) controller unit to investigate the performance of the control system. A mathematical model of the system has been derived, and the entire control system simulated via the MATLAB software package. The simulation process included tuning the gain parameters of the controller unit to achieve best behaviour of the system. In the computer simulation, two mathematical models of the electrical part of the solenoid coil were implemented; the first one involved the typical transfer functions of the coil, while the second dealt with an approximate model. The obtained results showed that the control system using the approximate model of the electrical part of the solenoid coil provides a more stable system and can thus be applied with acceptable response.
Ultrasonically Assisted Machining (UAM) is an emerging technology that has been utilized to improve the surface finishing in machining processes such as turning, milling, and drilling. In this context, piezoelectric u...
Ultrasonically Assisted Machining (UAM) is an emerging technology that has been utilized to improve the surface finishing in machining processes such as turning, milling, and drilling. In this context, piezoelectric ultrasonic transducers are being used to vibrate the cutting tip while machining at predetermined amplitude and frequency. However, modelling and simulation of these transducers is a tedious and difficult task. This is due to the inherent nonlinearities associated with smart materials. Therefore, this paper presents a component-based model of ultrasonic transducers that mimics the nonlinear behaviour of such a system. The system is decomposed into components, a mathematical model of each component is created, and the whole system model is accomplished by aggregating the basic components' model. System parameters are identified using Finite Element technique which then has been used to simulate the system in Matlab/SIMULINK. Various operation conditions are tested and performed to demonstrate the system performance.
The use of computational modelling to study the cardiovascular system has a great deal of potential, but it is also a significant problem that calls for expertise in a wide range of disciplines. This article’s goal i...
The use of computational modelling to study the cardiovascular system has a great deal of potential, but it is also a significant problem that calls for expertise in a wide range of disciplines. This article’s goal is to present a synopsis of the most current developments that have been made in the field of cardiovascular structural modelling. These developments include the development of numerical techniques, primary constitutive models, and modelling methodologies that can describe cardiovascular structures and diseases throughout a wide range of length and timelines. The purpose of this article is to act as an approachable point of reference for those who are new to the topic. The presentation begins with a general review of the models were first developed for one application and scale may be utilised for an expanding variety of applications that are quite similar to one another.
The method used for purchasing the corrosion behaviour the WC coatings deposited by plasma spraying, on a martensitic stainless steel substrate consists in measuring the electrochemical potential of the coating, respe...
The method used for purchasing the corrosion behaviour the WC coatings deposited by plasma spraying, on a martensitic stainless steel substrate consists in measuring the electrochemical potential of the coating, respectively that of the substrate, immersed in a NaCl solution as corrosive agent. The mathematical processing of the obtained experimental results in Matlab allowed us to make some correlations between the electrochemical potential of the coating and the solution temperature is very well described by some curves having equations obtained by interpolation order 4.
Many studies have been conducted to investigate the effect of environmental, mechanical and electrical stresses on insulator. However, studies on physical process of discharge phenomenon, leading to the breakdown of t...
Many studies have been conducted to investigate the effect of environmental, mechanical and electrical stresses on insulator. However, studies on physical process of discharge phenomenon, leading to the breakdown of the insulator surface are lacking and difficult to comprehend. Therefore, this paper analysed charge carrier generation mechanism that can cause free charge carrier generation, leading toward surface discharge development. Besides, this paper developed a model of surface discharge based on the charge generation mechanism on the outdoor insulator. Nernst's Planck theory was used in order to model the behaviour of the charge carriers while Poisson's equation was used to determine the distribution of electric field on insulator surface. In the modelling of surface discharge on the outdoor insulator, electric field dependent molecular ionization was used as the charge generation mechanism. A mathematical model of the surface discharge was solved using method of line technique (MOL). The result from the mathematical model showed that the behaviour of net space charge density was correlated with the electric field distribution.
In this study, methanol production was simulated using Aspen plus mathematicalmodelling and the effect of pressure and temperature towards methanol reactor production and selectivity as well as reactant conversions w...
In this study, methanol production was simulated using Aspen plus mathematicalmodelling and the effect of pressure and temperature towards methanol reactor production and selectivity as well as reactant conversions were investigated. Nowadays, the number of methanol plants are increasing due to high demand worldwide. Reactor is one of the main equipment for the methanol production and high impact accident such as explosion, may happen due to the upset of the critical process temperature and pressure which also could create major fluctuation of the methanol production. Thus, the reactor behaviour needed to be studied promptly so that the risk assessment can be performed in a later stage. A mathematical model for the fixed bed catalytic reactor which used RPLUG in Aspen Plus software was developed based on industrial data. The model had been validated and the percent error was below 5.5% compared to the industrial data. The model was also much better compared to the previous research which used ANN MATLAB for the model validation. Overall, it concluded that Aspen Plus simulation for this model could be used to simulate the process with regards to any changes in the process parameters.
A growing interest is nowadays directed towards the numerical modelling and monitoring of the interlaminar damage evolution of composite laminates, but also to the numerical mathematical models and techniques for simu...
A growing interest is nowadays directed towards the numerical modelling and monitoring of the interlaminar damage evolution of composite laminates, but also to the numerical mathematical models and techniques for simulation of the interface delamination. modelling and investigation of the mechanical behaviour and fracture modes of the multi-layered composites is a complex issue, since other important parameters, such as fibre orientation angles, stacking sequences and configuration of the composite laminates are added to the anisotropic character of the composite materials. Different failure modes may occur on multi-layered composites, while the delamination type fracture may lead to a considerable decrease of the load carrying capacity of the composite structures. Interlaminar stresses, which occur in composite laminates as an effect of the presence of the free edges, have a major influence on the delamination onset and the delamination growth. The paper summarizes the numerical methods and the approaches considered in the simulation of the delamination growth of composite laminates. The obtained results are figured in terms of the opening displacement at the interface crack tip and stress distributions on the plies of the multi-layered composites.
Effective condition monitoring techniques for wind turbines are needed to improve maintenance processes and reduce operational costs. Normal behaviourmodelling of temperatures with information from other sensors can ...
Effective condition monitoring techniques for wind turbines are needed to improve maintenance processes and reduce operational costs. Normal behaviourmodelling of temperatures with information from other sensors can help to detect wear processes in drive trains. In a case study, modelling of bearing and generator temperatures is investigated with operational data from the SCADA systems of more than 100 turbines. The focus is here on automated training and testing on a farm level to enable an on-line system, which will detect failures without human interpretation. modelling based on linear combinations, artificial neural networks, adaptive neuro-fuzzy inference systems, support vector machines and Gaussian process regression is compared. The selection of suitable modelling inputs is discussed with cross-correlation analyses and a sensitivity study, which reveals that the investigated modelling techniques react in different ways to an increased number of inputs. The case study highlights advantages of modelling with linear combinations and artificial neural networks in a feedforward configuration.
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