Krzysztof Smółka

MODELLING AND OPTIMISATION OF INTELLIGENT ELECTROSTATIC COMB ACCELEROMETER

This paper describes the field and circuit modelling of 2D/3D structure of surface micromachined (MEMS) accelerometers. This comb structure has been able to move only within the plane (two-axes movement). The main goal of investigation is to exploit the field method to extract equivalent capacitance characteristics to be treated as the background for equivalent circuit analysis and optimisation process.

Computer models of 3D magnetic microfibres used in textile actuators

Purpose – The purpose of this paper is to discuss the idea of designing and manufacturing intelligent clothes with magnetic fibres. The main goal of the research is to create the universal generator of computer structural models for whole bundles of magnetic microfibres.Design/methodology/approach – The paper presents the algorithm of magnetic microfibers computer modelling. It covers both finite element method (FEM) and reluctance network method. This paper deals with creating 3D computer structural models of magnetic microfibres, which could be introduced as the textile magnetic sensors or actuators. Because of very complicated 3D microfibres structure, it is hoped that the quickest possible method can be found to solve the problem.Findings – The results focus on the methodology presented in the paper which can be implemented in building 3D equivalent B/H curve of the microfibers set by using the field method – combining reluctance network method and FEM. Defining the proper magnetic B/H curves of magne...

Numerical modeling of 3D intelligent comb drive accelerometer structure: Mechanical models

Purpose – This paper aims to focus on the numerical modelling of 3D structure of surface micromachined (MEMS) accelerometers.Design/methodology/approach – The paper focuses on the methods of mechanical design and analysis of electrostatic accelerometers (comb drive structure) and uses computer simulation procedure leading to final structure design, then to be defined as a basic structure for stress analysis.Findings – The strategy in computer modeling of accelerometer MEMS is satisfactory in order to simulate the electromechanical characteristics of different accelerometer structures (IMEMS).Originality/value – A novel complex strategy in computer modeling of accelerometer MEMS, based on solid modeling is proposed.

Magnetic microfibres modelling methods

Purpose – The purpose of this paper is to describe research into the problem of creating computer structural models of magnetic microfibres. The main goal of the research is to create the universal generator of computer structural models for whole bundles of magnetic microfibres.Design/methodology/approach – The paper presents the algorithm of magnetic microfibres computer modelling. It covers both finite element method (FEM) and reluctance network method. Because microfibres with ferromagnetic grains have very complicated 3D structure, the quickest possible method was chosen.Findings – The results focus on the methodology presented in the paper which can be implemented in building 3D equivalent B/H curve of the microfibres set by use of field method – combining reluctance network method and FEM. Defining the proper magnetic B/H curves of magnetic fibres will enable the production of smart and resistant clothes.Originality/value – To date there are only measurements characteristics of B/H curve of magneti...

Numerical modeling of 3‐D comb drive electrostatic accelerometers structure (method of levitation force reduction)

Purpose – The purpose of this paper is to discuss the numerical modelling of 3D structure of micro‐electro‐mechanical systems (MEMS) accelerometers. The general idea being discussed is the method of levitation force reduction, as the main source of incorrect mathematical model of comb drive structure.Design/methodology/approach – Accelerometers design is a highly interdisciplinary area and, therefore, different methods and tools have to be exploited. Dynamic accelerometer behaviour modelling has been performed by use of a new object‐oriented model (NOOM), based on complex computer field and mechanical models.Findings – The paper describes methods of levitation force reduction in electrostatic comb drive structures based on electrostatic structural models and finite elements method.Research limitations/implications – In the present work, the authors limit themselves to the electrostatic energy domains.Practical implications – Both, mechanical and electric models of accelerometers give the input data for de...

Computer model of 3-D magnetic micro fibres used in textile actuators

The idea of designing and manufacturing intelligent clothes with magnetic fibres is discussed in the paper. This paper deals with the creating 3-D computer structural models of magnetic microfibres, which could be introduced as the textile magnetic sensors or actuators.

Integrated Computer Models of 3-D Comb Drive Electrostatic MEMS Structures

This paper deals with the numerical modeling of 3D structure of surface micromachined MEMS different comb drive geometries. The paper is devoted to the complex strategy of modeling, proposed by authors, of micro-actuators of comb structure. This methodology is based on vector field 3-D structural models and the object oriented models and lumped parameters as well, applied to the different structure of MEMS.

Induction heating process of ferromagnetic filled carbon nanotubes based on 3-D model

Abstract Since their discovery by Iijima in 1991 [1], carbon nanotubes have sparked unwavering interest among researchers all over the world. This is due to the unique properties of carbon nanotubes (CNTs). Carbon nanotubes have excellent mechanical and electrical properties with high chemical and thermal stability. In addition, carbon nanotubes have a very large surface area and are hollow inside. This gives a very broad spectrum of nanotube applications, such as in combination with polymers as polymer composites in the automotive, aerospace or textile industries. At present, many methods of nanotube synthesis are known [2, 3, 4, 5, 6]. It is also possible to use carbon nanotubes in biomedical applications [7, 8, 9, 10, 11, 12, 13, 14], including the destruction of cancer cells using iron-filled carbon nanotubes in the hyperthermia process. Computer modelling results of Fe-CNTs induction heating process are presented in the paper. As an object used for computer model creation, Fe-CNTs were synthesized by the authors using CCVD technique.

3-dimensional computer model of electrospinning multicapillary unit used for electrostatic field analysis

Abstract Electrospinning is an experimental method of the polymer super thin fibres formation using the electrostatic field. The distribution of electrostatic field affects the effectiveness of the electrospinning. In order to analyse the electrostatic field for given technological parameters the 3-D computer model of an electrospinning device must be applied.

Three-dimensional computer models of electrospinning systems

Abstract Electrospinning is a very interesting method that allows the fabrication of continuous fibers with diameters down to a few nanometers. This paper presents an overview of electrospinning systems as well as their comparison using proposed three-dimensional parameterized numerical models. The presented solutions allow an analysis of the electric field distribution.