scholarly journals DEVELOPMENT OF THE BASIC CAPACITIVE ACCELEROMETERS MODELS BASED ON THE VHDL-AMS LANGUAGE FOR THE CIRCUIT LEVEL OF COMPUTER-AIDED DESIGN

2020 ◽  
Vol 2 (1) ◽  
pp. 15-20
Author(s):  
V. M. Teslyuk ◽  
◽  
P. Yu. Denysyuk ◽  
T. V. Teslyuk ◽  
◽  
...  
Keyword(s):  
Differential Equations ◽  
Computer Aided Design ◽  
Structural Parameters ◽  
Software Systems ◽  
Mems Devices ◽  
Electric Circuits ◽  
Capacitive Accelerometer ◽  
Level Of Automation ◽  
Electric Parameters ◽  
Physical Principles

In the article, the basic VHDL-AMS models of MEMS-based capacitive accelerometers were developed. The models were designed for two basic types of capacitive accelerometers, namely lamellar and counter-pivotal. The developed models allow us to determine the source of electrical capacitive accelerometers depending on the incoming mechanical and structural parameters and were constructed for MEMS CAD at the circuit level. The circuit level of MEMS development requires an analysis of the total integrated device electric circuits. For this purpose, all the MEMS components should be written in the specific software systems, which would be understandable for the software system. Taking into account that MEMS devices operate on different physical principles, certain difficulties may arise during the electrical analysis, that is, the work of mechanical or other devices need to be described with the help of electric parameters. In the general case, the method for building the VHDL-AMS model of the MEMS-based capacitive accelerometer is needed construction of the simplified mechanical model, and then a simplified electrical model. On the basis of the simplified models, the VHDL-AMS model of electromechanical MEMS devices has been developed. In the article, the method of automated synthesis and mathematical models using the VHDL-AMS language, which is based on the method of electrical analogies were described. They use systems of ordinary differential equations and partial differential equations to determine the relationships between input and output parameters. The sequence and quantity of used differential equations are determined by the physical principles of operation of the MEMS element and the number of energy transformations, which allows increasing the level of automation of synthesis operations compared to existing methods. The results of the basic lamellar and counter-pivotal capacitive accelerometers are also shown. This enables to conduct research and analysis of its parameters and investigate the output electric parameters dependence on the input mechanical ones.

Digital Technologies in Architecture and Engineering

2018 ◽  
pp. 618-653
Author(s):  
Sara Eloy ◽  
Miguel Sales Dias ◽  
Pedro Faria Lopes ◽  
Elisângela Vilar
Keyword(s):  
Computer Aided Design ◽  
Teaching And Learning ◽  
Systems Design ◽  
Digital Technologies ◽  
3D Modelling ◽  
Shape Grammar ◽  
Software Systems ◽  
Science Curricula ◽  
Aided Design

This chapter focuses on the development and adoption of new Multimedia, Computer Aided Design, and other ICT technologies for both Architecture and Computer Science curricula and highlights the multidisciplinary work that can be accomplished when these two areas work together. The authors describe in detail the addressed educational skills and the related developed research and highlight the contributions towards the improvements of teaching and learning in those areas. This chapter discusses the role of digital technologies, such as Virtual Reality, Augmented Reality, Multimedia, 3D Modelling software systems, Design Processes and its evaluation tools, such as Shape Grammar and Space Syntax, within the Architecture curricula.

scholarly journals Thermal Drift Investigation of an SOI-Based MEMS Capacitive Sensor with an Asymmetric Structure

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3522 ◽  
Author(s):  
Haiwang Li ◽  
Yanxin Zhai ◽  
Zhi Tao ◽  
Yingxuan Gui ◽  
Xiao Tan
Keyword(s):  
Structural Parameters ◽  
Weighted Average ◽  
Capacitive Sensor ◽  
Expansion Ratio ◽  
Asymmetric Structure ◽  
Temperature Sensitive ◽  
Navigation Systems ◽  
Temperature Drift ◽  
Capacitive Accelerometer ◽  
Symmetric Structure

High-precision, low-temperature-sensitive microelectromechanical system (MEMS) capacitive accelerometers are widely used in aerospace, automotive, and navigation systems. An analytical study of the temperature drift of bias (TDB) and temperature drift of scale factor (TDSF) for an asymmetric comb capacitive accelerometer is presented in this paper. A five-layer model is established for the equivalent expansion ratio in the TDB and TDSF formulas, and the results calculated by the weighted average of thickness and elasticity modulus method are closest to the results of the numerical simulation. The analytical formulas of TDB and TDSF for an asymmetric structure are obtained. For an asymmetric structure, TDB is only related to thermal deformation and fabrication error. Additionally, half of the fixed electrode distance is not included in the expressions of Δ d and Δ D for asymmetric structures, thus resulting in the TDSF of the asymmetric structure being smaller compared to a symmetric structure with the same structural parameters. The TDSF of the symmetric structure is [−200.2 ppm/°C, −261.6 ppm/°C], while the results of the asymmetric structure are [−11.004 ppm/°C, −72.404 ppm/°C] under the same set of parameters. The parameters of the optimal asymmetric structure are obtained for fabrication guidance using numerical methods. In the experiment, the TDSF and TDB of the packaged structure and the non-packaged structure are compared, and a significant effect of the package on the signal output is found. The TDB is reduced from 3000 to 60 μg/°C, while the TDSF is reduced from 3000 to 140 ppm/°C.

Engineering Graphics Course Using Modern Software Systems for Students of Civil Engineering University

2015 ◽  
Vol 3 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Петухова ◽  
Anna Petukhova
Keyword(s):  
Computer Aided Design ◽  
Civil Engineering ◽  
Integrated Approach ◽  
3D Models ◽  
Technical Condition ◽  
Railway Track ◽  
Software Systems ◽  
Gradual Transition ◽  
Engineering Graphics ◽  
Amount Of Knowledge

We should equip the graduates of technical universities with the most modern knowledge. It is one of the most impor - tant teaching aims. Civil engineer must be able to draw, read drawings, simulate parts, mechanisms, structures, buildings and sites on their computers. This is a great amount of knowledge and a huge range of skills, and their formation requires a gradual transition from drawings using pencil and ruler, through a standard drawing program (such Autodesk AutoCAD and Compass ASCON) to the more complex software systems (AutoCAD, Revit and AutoCAD Civil 3D). The article presents our experience in developing educational programs for undergraduate and specialties. The program is designed for "General construction", "Railway Construction", "Management of the technical condition of the railway track", "Bridges", "Tunnels and Subways", "Industrial and Civil Engineering", "Water supply and sanitation". The system of training is based on a modular principle. The first module "Descriptive Geometry" uses the classic teaching methods. Although it is supplemented by modern visualization tools (electronic posters, presentations, 3D models). The second module "Engineering Graphics" is built with a focus on computer way of doing drawings. At this stage, we form the basic skills of drawing and 3D-modeling. The main goal the next phase of training (course "Computer Graphics") is to form good skills in computer-aided design. In the last stage (course "Software"), we use the most modern software systems using BIM. An integrated approach can effectively reach both local and general educational purposes and creates a base for the formation of core professional competencies engineer.

scholarly journals Three Out of Two

2001 ◽  
Vol 123 (09) ◽  
pp. 60-63 ◽  
Author(s):  
Jean Thilmany
Keyword(s):  
Computer Aided Design ◽  
Tool Design ◽  
Software Systems ◽  
Full Potential ◽  
Drawing Tool ◽  
Cad Systems ◽  
3D Cad ◽  
Computer Aided ◽  
General Contractors ◽  
Aided Design

This article reviews computer-aided design (CAD) software that is meant to function as more than a drawing tool; design offices and general contractors are still learning how to take advantage of its full potential even as the software systems mature. CAD systems are used to sell products before they are produced, to warehouse past designs in a central library, and to describe an intended design to a parts supplier. Traditional wisdom holds that 2D CAD systems are best suited to products with simple geometries that can be easily represented without considerable interpretive errors, products such as the nozzles. Often, 2D drawings can be ambiguous and are open to errors in interpretation, especially in cases of complex designs, according to the Queensland Manufacturing Institute (QMI) report. Century Tool wanted to use the 3D CAD software to check for interferences in the design of a part a customer had charged Century Tool with building.

scholarly journals On Modelling and Simulation of Electric Circuit Problems

2020 ◽  
Vol 3 (1) ◽  
pp. 24-29
Author(s):  
Hassan Adamu Alfaki ◽  
Muhammad Kabir Dauda ◽  
Ahmed Mohammed Gimba ◽  
Mohammed Abdullahi Ahmed
Keyword(s):  
Differential Equations ◽  
Electric Circuit ◽  
Physical Sciences ◽  
Electric Circuits ◽  
Order Linear ◽  
Linear Ordinary Differential Equations ◽  
First Order ◽  
Engineering Mathematics ◽  
Linear Differential ◽  
Physical Laws

Differential equations are of fundamental importance in Mathematics, Physical Sciences and Engineering Mathematics. Many mathematical relations and physical laws appeared in the form of such equations. This paper reviewed an application of these equations in solving mathematical model on electric circuit problems using the First order linear differential equation. The analytical approached in solving the equations confirmed that solving electric circuits using first order linear ordinary differential equations gives accurate and reliable result. Therefore, the application is of importance and great need. However, complex problems need higher order differential equations, which are nonlinear and have entirely different approach in finding their solutions.

scholarly journals Laser Scanning Based Object Detection to Realize Digital Blank Shadows for Autonomous Process Planning in Machining

2021 ◽  
Vol 6 (1) ◽  
pp. 1
Author(s):  
Berend Denkena ◽  
Marcel Wichmann ◽  
Klaas Maximilian Heide ◽  
René Räker
Keyword(s):  
Computer Aided Design ◽  
Laser Scanning ◽  
Numerical Control ◽  
Software Systems ◽  
Process Data ◽  
Computer Aided ◽  
Cad Cam ◽  
Scan Paths ◽  
Interference Signals ◽  
Aided Design

The automated process chain of an unmanned production system is a distinct challenge in the technical state of the art. In particular, accurate and fast raw-part recognition is a current problem in small-batch production. This publication proposes a method for automatic optical raw-part detection to generate a digital blank shadow, which is applied for adapted CAD/CAM (computer-aided design/computer-aided manufacturing) planning. Thereby, a laser-triangulation sensor is integrated into the machine tool. For an automatic raw-part detection and a workpiece origin definition, a dedicated algorithm for creating a digital blank shadow is introduced. The algorithm generates adaptive scan paths, merges laser lines and machine axis data, filters interference signals, and identifies part edges and surfaces according to a point cloud. Furthermore, a dedicated software system is introduced to investigate the created approach. This method is integrated into a CAD/CAM system, with customized software libraries for communication with the CNC (computer numerical control) machine. The results of this study show that the applied method can identify the positions, dimensions, and shapes of different raw parts autonomously, with deviations less than 1 mm, in 2.5 min. Moreover, the measurement and process data can be transferred without errors to different hardware and software systems. It was found that the proposed approach can be applied for rough raw-part detection, and in combination with a touch probe for accurate detection.

scholarly journals Improvement of modeling techniques of transients in transformers based on magnetoelectric equivalent schemes

2021 ◽  
pp. 107-112
Author(s):  
D Patalakh ◽  
A Prykhodko ◽  
K Lut ◽  
S.O Tykhovod
Keyword(s):  
Differential Equations ◽  
Spline Interpolation ◽  
Process Analysis ◽  
Transient Processes ◽  
Processor Time ◽  
Electric Circuits ◽  
Electromagnetic Transient ◽  
Magnetic Circuits ◽  
Electromagnetic Processes ◽  
Linear Algebraic Equations

Purpose. Use of an improved numerical method of calculating transient processes in electrical circuits for modeling electromagnetic processes in nonlinear magneto-electric circuits, and also development of a circuit model based on this method, which leads to the convenience of calculation. Methodology. Approximation of functions by Chebyshevs polynomials, numerical methods of differential equations integrating, matrix methods, spline interpolation, programming, theory of electric and magnetic circuits. Findings. On the base of the well-known method of transient process analysis in linear electric circuits, the method of numerical calculation of transient processes in nonlinear magneto-electric equivalent circuits of transformer has been developed. By the help of the proposed method it is possible to reduce processing time for modeling electromagnetic processes in transformers. The example of using the developed method is shown. The computer program for modeling of electromagnetic transient in a single-phase transformer based on the described method has been developed. This example shows reduction of processor time by more than four times compared to examples of calculations based on other known methods. Originality. The method in which the solution of state differential equations is presented in the form of decomposition into a series along orthogonal Chebyshevs polynomials is used in this work. The polynomial approximation applied in this work is not corresponding to the solution function itself, but its derivative, which significantly reduces the error of integration of differential equations. Differential equations of state are transformed into linear algebraic equations for special images of solution functions. A principle is developed of constructing magneto-electric substitution circuits in which images of solution functions appear. Images of true dynamic currents and magnetic fluxes in the proposed equivalent scheme are interpreted as direct currents and direct magnetic fluxes. The used method has shown advantages in accuracy and time of simulation of electromagnetic transient over other known methods based on application of magneto-electric substitution circuits. Practical value. The developed method opens up the possibility of using the apparatus of the theory of electric and magnetic circuits to work with images of currents and magnetic fluxes. Based on this, a universal software complex is being developed to calculate transients in transformers of various constructions.

Nonlinear dynamic characteristics of symmetric rectangular honeycomb sandwich thin panel

2020 ◽  
pp. 109963622092889
Author(s):  
Yongqiang Li ◽  
Wenkai Yao ◽  
Yingjie Zhang
Keyword(s):  
Differential Equations ◽  
Ordinary Differential Equations ◽  
Frequency Ratio ◽  
Structural Parameters ◽  
Shear Deformation Theory ◽  
Length Ratio ◽  
Analytic Approximation ◽  
Nonlinear Frequency ◽  
Honeycomb Sandwich ◽  
Thin Panel

In the present work, nonlinear dynamics of symmetric rectangular honeycomb sandwich thin panel is investigated. The nonlinear governing equations of the thin panel are derived by using Hamilton’s principle and Reddy’s third-order shear deformation theory. After that, the Galerkin method is used to discretize the equation of motion, resulting in a set of ordinary differential equations with respect to time. The ordinary differential equations are solved analytically by utilizing the homotopy analysis method. The influence of structural parameters to the nonlinear frequencies of the symmetric rectangular honeycomb sandwich panel with simply supported boundaries along all four edges is discussed by using the analytic approximation method. Our findings demonstrate that the nonlinear frequency ratio decreases first and then increases with the increase of the width-to-length ratio and thickness-to-length ratio. When the width-to-length ratio is greater than 10, the nonlinear frequency ratio remains almost unchanged with the further increase of width-to-length ratio.

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