Intellectual Measuring Complex for Control of Geometrical Parameters of Aviation Details

2020 ◽  
pp. 352-371
Author(s):  
Mariia Kataieva ◽  
Alina Yurchuk
Keyword(s):  
Computer Simulation ◽  
Measurement Error ◽  
Three Dimensional ◽  
Geometric Parameters ◽  
Measurement Process ◽  
Geometrical Parameters ◽  
Automated Method ◽  
Measuring Complex ◽  
Graphic Depiction

This chapter proposes a new automated method of measuring complex three-dimensional surfaces of aircraft parts in static and dynamic modes. The method allows conducting measurements in closed conditions and at the site of the aircraft disposition. The method consists in the continuous determination of the coordinates of the points of the surface of the detail and their representation in a three-dimensional graphic depiction. New methods of measuring the geometric parameters of parts with the complex spatial surface are suggested. This opens the prospect for the development of new ways of measuring geometric parameters of parts in real-time with high metrological characteristics and computer simulation of the measurement process. The differential-digital method is based on the suggested zero-coordinate principle of the measurement process which involves simultaneous parts availability check, and connects measurement result obtained which provided a reduction in the order of measurement error.

scholarly journals Automated Acquisition of Proximal Femur Morphological Characteristics

2014 ◽  
Vol 14 (5) ◽  
pp. 285-293
Author(s):  
Slobodan Tabakovic ◽  
Milan Zeljkovic ◽  
Zoran Milojevic
Keyword(s):  
Morphological Characteristics ◽  
Geometric Parameters ◽  
Geometrical Parameters ◽  
Efficient Design ◽  
Hip Endoprosthesis ◽  
Hip Joint Endoprosthesis ◽  
Subsequent Determination ◽  
Arthroplasty Surgery ◽  
Automated Determination

Abstract The success of the hip arthroplasty surgery largely depends on the endoprosthesis adjustment to the patient's femur. This implies that the position of the femoral bone in relation to the pelvis is preserved and that the endoprosthesis position ensures its longevity. Dimensions and body shape of the hip joint endoprosthesis and its position after the surgery depend on a number of geometrical parameters of the patient's femur. One of the most suitable methods for determination of these parameters involves 3D reconstruction of femur, based on diagnostic images, and subsequent determination of the required geometric parameters. In this paper, software for automated determination of geometric parameters of the femur is presented. Detailed software development procedure for the purpose of faster and more efficient design of the hip endoprosthesis that ensures patients’ specific requirements is also offered

Computer Simulation for the Stereotactic Placement of Interstitial Radionuclide Sources into Computed Tomography-defined Tumor Volumes

Neurosurgery ◽  
1984 ◽  
Vol 14 (4) ◽  
pp. 442-448
Author(s):  
J. Kelly Patrick ◽  
A. Kall Bruce ◽  
Goerss Stephan
Keyword(s):  
Computed Tomography ◽  
Computer Simulation ◽  
Solid Tumor ◽  
Tumor Volume ◽  
Three Dimensional ◽  
Radioactive Source ◽  
Stereotactic Frame ◽  
Ct Data ◽  
Ct Slices

Abstract This report describes a method for the preoperative determination of radioactive interstitial source placement within computed tomography (CT)-defined tumor boundaries. The method utilizes CT data obtained under stereotactic conditions. Tumor boundaries are digitized from CT slices and are retained in a three-dimensional computer matrix. A solid tumor volume is created by an interpolation program and may be sliced orthogonal to any specific stereotactic surgical view line. The surgeon may simulate radioactive source placement within the slices and view the resultant isodose configuration against tumor contours on successive slices. Once the best source placement has been determined, the computer outputs the mechanical adjustments that will be necessary on a stereotactic frame located in the operating room for the stereotactic placement of each source and gives the length of each source. Sources are stereotactically implanted utilizing a double-catheter afterloading technique.

Buckling Delamination of the Rectangular Orthotropic Thick Plate With an Edge Rectangular Crack

2010 ◽  
Author(s):  
Surkay Akbarov ◽  
Nazmiye Yahnioglu ◽  
Esra Eylem Karatas
Keyword(s):  
Compressive Loading ◽  
Three Dimensional ◽  
Initial Imperfection ◽  
Critical Force ◽  
Geometrical Parameters ◽  
Field Equations ◽  
Rectangular Crack ◽  
Anisotropic Bodies ◽  
Buckling Delamination

The buckling delamination problem for the rectangular plate made from composite (orthotropic) material is studied. It is supposed that the plate has a rectangular edge-crack and edge-surfaces of that have an initial infinitesimal imperfection. The development of this initial imperfection with an external compressive loading acting along the crack is studied in the framework of the three-dimensional geometrically nonlinear field equations of the elasticity theory of anisotropic bodies. For the determination of the values of the critical force the initial imperfection criterion is used. The corresponding boundary-value problems are solved by employing the boundary form perturbation techniques and the FEM. The influence of the material or geometrical parameters of the plate on the values of critical force is discussed.

scholarly journals The use of a model current wedge in the determination of the position of substorm current systems

1995 ◽  
Vol 13 (6) ◽  
pp. 583-594 ◽  
Author(s):  
M. Cramoysan ◽  
R. Bunting ◽  
D. Orr
Keyword(s):  
Observation Interval ◽  
Three Dimensional ◽  
Secondary Process ◽  
Geometrical Parameters ◽  
Three Dimensional Model ◽  
Current Growth ◽  
Field Lines ◽  
Current Systems ◽  
Current Wedge

Abstract. We present a technique for determination of the position and extent of the current systems present during substorm breakup. The parameters of a three-dimensional model of the currents are determined by fitting the model to data from the SAMNET magnetometer array, a midlatitude array of seven stations. The model used is a fully 3D current wedge aligned along dipolar field lines, the parameters being the meridians of upward and downward field-aligned currents (FACs), the latitude of the auroral electrojet and the magnitude of current growth over the observation interval. The method is novel in that the three geometrical parameters are first determined with the fourth arrived at via a secondary process. It has been applied to a number of events and appears to make estimates of the longitudes of the FACs consistent with the predictions of previous methods. Since the method employs a fully 3D model of the substorm current wedge as opposed to an idealised 2D model, it is reasonable to place more reliance on the results so obtained. Moreover, the method also has the additional benefit of a prediction of the latitude of the substorm electrojet and the nature of the current growth through the wedge at substorm onset.

scholarly journals DYNAMICS INTERACTION OF THE SHARE MOLE PLOW WITH SOIL IN THE FORMATION OF THE CAVITY FORIMPERVIOUS SCREEN

2020 ◽  
pp. 44-52
Author(s):  
Olena Solona ◽  
Vladimir Kovbasa ◽  
Oleksandr Melnik
Keyword(s):  
Mechanical Properties ◽  
Contact Zone ◽  
Three Dimensional ◽  
Geometric Parameters ◽  
Geometrical Parameters ◽  
Problem Solution ◽  
Equilibrium Equations ◽  
Stress Components ◽  
Soil Irrigation ◽  
The Stability

To maintain moisture and best spread it in the horizontal direction under in-soil irrigation of agricultural plants there is a necessity of laying moisturizers together with an impermeable screen. For this purpose, share mole plow can be used. Substantiation of tool's geometrical parameters and modes of operation is an actual scientific problem. Solution of this problem requires formalizing the soil as the medium on which the tool is directed, as well as formalizing the interaction of the tool with the soil. This article discusses the dynamics of the ploughshare forming a horizontal gap into which the anti-filter screen extends. For this, the interaction of the plowshare of the mole with the soil in the contact zone during compaction of the walls of the formed cavity is under considered. Herewith, the degree of compaction of the walls affects the stability of the arch of the formed cavity. During the study, the soil is presented in the form of an elastic viscous deformable medium, and the ploughshare - in the form of an absolutely solid. The surface of this solid is described by a three-dimensional equation in an implicit form, the coefficients of which characterize the geometric parameters of the tool. In a previous article, the authors obtained functions of the rates of soil deformations from the action of the tool. Based on the strains functions with use the physical equations of the connection between stress and strains, the functions of the stress components on the mechanical properties of the soil and the parameters of the tool are obtained. The stress components obtained in the contact zone of the plowshare with the soil made it possible to determine the function of changing the specific volume of the soil. This function is inversely proportional to soil density. The use of equilibrium equations on the contact surface made it possible to determine the components of the forces that act from the soil side on the ploughshare. Integration of the obtained components of the distributed forces over the ploughshare surfaces made it possible to obtain the sum of the resistance forces to the ploughshare movement, depending on the mechanical properties of the soil and tool parameters. As a result of the study, rational parameters of the equation coefficients of the ploughshare surface that characterize its geometric parameters are determined.

scholarly journals Experimental determination of the rational geometrical parameters of the sprinkler frame arms and deflector on the expansion rate and stability of foam

2019 ◽  
Vol 64 (1) ◽  
pp. 60-68 ◽  
Author(s):  
A. N. Kamluk ◽  
A. O. Likhamanau
Keyword(s):  
Quality Characteristics ◽  
Geometric Parameters ◽  
Expansion Rate ◽  
Geometrical Parameters ◽  
External Diameter ◽  
Foam Formation ◽  
Taper Angle ◽  
Foam Expansion ◽  
Mechanical Foam

The results of experimental studies on determination of the effect of the deflector-type sprinkler geometric parameters on the air-mechanical foam formation process are presented in the article. A collapsible sprinkler was developed for the experiment. The elements of the collapsible sprinkler which allow creating its various configurations in a fairly wide range of geometric parameters were made from polylactide (PLA-plastic) with the help of 3D printing. The dependencies of the air-mechanical foam expansion rate and stability on the sprinkler holder length, as well as the external diameter, the taper angle and the ledges height of the sprinkler sprayer were established. The ranges of optimal values along the holder length L = 45÷55 mm and the sprayer ledges height h = 1÷3 mm of the sprinkler for generation of foam with the greatest expansion rate and stability were determined, as well as the ranges of values of these parameters at which the change in the quality characteristics does not occur (L = 90÷150 mm, h = 5÷15 mm). A decrease in the foam quality characteristics with an increase in the sprayer taper angle of the sprinkler was established. Approximate dependencies of the foam expansion rate and stability on the sprayer taper angle of the sprinkler in the range α = 30÷135° were obtained. In addition, it is determined that an increase in the sprayer external diameter in the range from 20 mm to 100 mm results in a gradual deterioration in the foam qua lity. The results of the conducted researches will allow optimizing geometrical parameters of existing designs of deflector-type sprinklers with the aim to increase their fire extinguishing efficiency.

Conformation of Ribosomes from Escherichia Coli

1974 ◽  
Vol 32 ◽  
pp. 210-211
Author(s):  
M. Boublik ◽  
W. Hellmann ◽  
F. Jenkins
Keyword(s):  
Binding Sites ◽  
Ribosomal Proteins ◽  
Fluorescent Dyes ◽  
Protein Biosynthesis ◽  
Three Dimensional ◽  
Spatial Arrangement ◽  
Dimensional Structure ◽  
Complete Understanding ◽  
And Function

The present knowledge of the three-dimensional structure of ribosomes is far too limited to enable a complete understanding of the various roles which ribosomes play in protein biosynthesis. The spatial arrangement of proteins and ribonuclec acids in ribosomes can be analysed in many ways. Determination of binding sites for individual proteins on ribonuclec acid and locations of the mutual positions of proteins on the ribosome using labeling with fluorescent dyes, cross-linking reagents, neutron-diffraction or antibodies against ribosomal proteins seem to be most successful approaches. Structure and function of ribosomes can be correlated be depleting the complete ribosomes of some proteins to the functionally inactive core and by subsequent partial reconstitution in order to regain active ribosomal particles.

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