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AUTOMATION OF TIMBER FRAME HOUSE DESIGN
No full textThis paper describes the efficiency of implementation of 3D CAD based
timber frame design software SEMA for private house building design. The
software provides direct design documentation transfer to CNC based
sawmill facilities reducing the amount of required paper documentation.
The use of SEMA software for the design and production of prefabricated
timber frames allowed reducing the required amount of design blueprint
documentation almost ten times for the identical private house project in
comparison to conventional design prepared with AutoCAD drawings
Pathology Zone Volume Estimation in 3D Medical Images of a Brain
No full textMedical images of a brain, acquired with computer tomography (CT) and magnetic resonance (MR) are widely used in medicine for patient diagnosis. To diagnose the patient it is relevant to analyze the pathology zones of the medical image and estimate their volume. The standard software for processing MR and CT images in many cases does not meet the requirements of physicians (problems with pathology zone extraction and volume estimation). Therefore, a task of medical image pathology zone volume estimation develops in medical image analysis.
To solve this task, an efficient volume estimation method for evaluating volume of the pathology zones is proposed in this work. The proposed approach uses the data of 3D brain model, which is rebuilt from 2D medical images.
The developed method can be used to obtain volume of the pathology zone with high precision and provide practical improvements to the reliability of medical diagnostics
Application of Mapping Methods for Solving Navigation Tasks of Autonomous Intelligent System
No full textCondensation of 2-Aminobenzoic Acid N-substituted Hydrazides with Aromatic and Heterocyclic Aldehydes
No full textIntegrating 3D CAD Applications into Descriptive Geometry and Engineering Graphics Studies
No full textThe paper discusses the importance of engineering graphics skills development in engineering core education. The engineering graphics subject is the essence of engineering language. In turn, the descriptive geometry is a grammar of engineering graphics. The topic still is important at the age of rapid economic and information technology advancements in all the world. Recent studies about the improvement of “Descriptive Geometry and Engineering Graphics“ course in Riga Technical University will be discussed. The main objective of the course is to introduce the first year students with graphic communication basics and prove the motivation and importance of classical knowledge while dealing with contemporary CAD systems. Geometric modelling and visualization exercises help in improving the spatial perception skills. The selection of particular CAD system depends on the curriculum. The efficiency of the teaching will be higher when one particular CAD system will be streamlined in different subjects during the studies – starting from Engineering Graphics in first year, following Machine Elements, Kinematics Analysis, Finite Element Analysis, Computer Aided Manufacturing, etc. in consecutive studies. SolidWorks was choosen in Mechanical Engineering studies as a the most widely used 3D product design solution
Rigid Body Impact Models Partially Considering Deformation
No full textThe paper deals with the low-speed impact of rigid bodies. The elasticity and damping forces, acting on a body during the impact, depend on the physical properties of the material; in this work these forces are considered according to the Kelvin-Voigt, Bingham and Maxwell models of the medium. New models of the forces, acting during the impact, are elaborated. Numerical solutions of the equations for various impact forces are obtained
Lāzera stara plūsmas atstarošanas izpēte veļas materiālos
No full textDarbā atzīmēts, ka cilvēka skenēšanai kā mēru iegūšanas metodei piemīt vairākas priekšrocības. Dati tiek iegūti ļoti īsā laikā, savukārt iegūto datu nomenklatūra un pielietojums ir daudz plašāks salīdzinājumā ar manuāli iegūtajiem datiem.
Ķermeņa mēru iegūšanai izmantojamajās skenēšanas sistēmās tiek lietoti dažādi datu iegūšanas veidi: gaismēnas, lāzerstari u.c. Pētījumā noteikta dažādu tekstilmateriālu lāzerstara atstarošanas spēja un atstarošanu raksturojošā līkne salīdzināta ar Lamberta likumam atbilstošās difūzās atstarošanas līkni.
Plānojot eksperimentu un izvēloties testējamos materiālus, sastādīta materiālu atlases matrica, kurā parādīta visu iespējamo materiālu izvēle. Eksperimenta veikšanai izvēlēti kopā astoņi tekstilmateriāli: seši veļas ražošanā izmantoti materiāli un divi papildus materiāli.
Eksperimentālo datu iegūšanai lietots lāzerstars ar krišanas leņķi 0º un 45º. Salīdzināta arī rezultātu atkarība no lietotā stara viļņa garuma.
Darba secinājumos minēti antropometriskai skenēšanai pieļaujamie veļas materiāli un konstatēts, kādi materiāli negatīvi ietekmē skenēšanas rezultāta precizitāti