Научная статья на тему 'One-to-one nonlinear transformation of the space with identity plane'

One-to-one nonlinear transformation of the space with identity plane Текст научной статьи по специальности «Физика»

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Ключевые слова
МОДЕЛЮВАННЯ ПРОСТОРУ / КВАЗіЛіНіЙНі МОДЕЛі / ПЕРЕТВОРЕННЯ ПРОСТОРУ / НЕЛіНіЙНі ПОВЕРХНі / ГРАФіЧНА КОНСТРУКЦіЯ / АКСіОМАТИЧНА КОНСТРУКЦіЯ / SPACE MODELLING / QUASI-LINEAR MODEL / SPACE TRANSFORMATION / NON-LINEAR SURFACE / GRAPHIC DESIGN / AXIOMATIC DESIGN / МОДЕЛИРОВАНИЕ ПРОСТРАНСТВА / КВАЗИЛИНЕЙНЫЕ МОДЕЛИ / ПРЕОБРАЗОВАНИЕ ПРОСТРАНСТВА / НЕЛИНЕЙНЫЕ ПОВЕРХНОСТИ / ГРАФИЧЕСКАЯ КОНСТРУКЦИЯ / АКСИОМАТИЧЕСКАЯ КОНСТРУКЦИЯ

Аннотация научной статьи по физике, автор научной работы — Malyi A.D., Ulchenko T.V., Shcherbak A.S., Popudniak Yu. Ya., Starosolskaya T.V.

Purpose. Study of geometric transformations. We will consider the so-called point transformations of space. Methodology. The most important are one-to-one transformations. They allow exploring and studying the properties of the transformed object using the properties of the original object (line, surface and figure) and the properties of the transformation. Cremona transformations occupy a special place in the set of one-to-one nonlinear transformations. Construction of one-parameter (stratifiable) transformations is carried out as one-parameter set of plane transformations, both linear and non-linear ones. The plane, in which the specific transformation is prescribed, moves in space by a certain law forming a one-parameter set of planes. The set of such plane transformations makes up the space transformation. Findings. The designed graphics algorithms and the established transformation equations allow building the visual images of transformed surfaces and conducting their research by analytical geometry methods. Originality. By completing elementary algebraic transformations of this equation, we obtain the cissoids equation. If the plane is continuously moved parallel to itself, it results in occurrence of surface, whose carcass will be the set of cissoids and the set of front-projecting lines. Practical value. The considered set of stratifiable algebraic transformations gives an effective means for exploring new curves and surfaces obtained by transforming the known algebraic lines and surfaces. These graphic algorithms allow graphically depicting the transformed lines and surfaces. The considered procedure of drawing up analytical formulas of specific transformations allows us to study the transformed surfaces and lines using the methods of analytic geometry. The above transformations can be of arbitrary high order, which is especially important during the design of complex technical surfaces such as aircraft components, parts of water and gas turbines, supports of the structures subject to strong flow of liquid, etc. Space modelling issues, including the building of graphic plane models of space, are relevant both in theoretical terms and in terms of application of the non-linear surfaces investigated on their basis for constructing the technical forms of parts and aggregates of construction machine movable elements, the middle surfaces of shells, the surfaces of turbulent blade, etc.

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Текст научной работы на тему «One-to-one nonlinear transformation of the space with identity plane»

Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету залiзничного транспорту, 2016, № 3 (63)

UDC 514.181.2

A. D. MALYI1, T. V. ULCHENKO 2, A. S. SHCHERBAK3*, YU. YA. POPUDNIAK4, T. V. STAROSOLSKAYA5

1Dep. «Grafics», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel. +38 (056)713 56 49, e-mail malyjanatolij@gmail.com, ORCID 0000-0002-2710-7532 2Dep. «Grafics», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel.+38 (067) 724 47 22, e-mail ulchenkotv@ya.ru, 3ORCID 0000-0003-2354-7765

3*Dep. «Grafics», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel. +38 (067) 586 45 74, e-mail pro-f@ukr.net, ORCID 0000-0003-1340-0284 4Dep. «Grafics», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel. +38 (067) 774 17 47, e-mail 19brit18@ukr.net, ORCID 0000-0002-1383-9863

5Dep. «Grafics», Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan, Lazaryan St., 2, Dnipropetrovsk, Ukraine, 49010, tel.+38 (066) 791 35 94,e-mail simatn@rambler.ru, ORCID 0000-0002-3851-9612

ONE-TO-ONE NONLINEAR TRANSFORMATION OF THE SPACE WITH IDENTITY PLANE

Purpose. Study of geometric transformations. We will consider the so-called point transformations of space. Methodology. The most important are one-to-one transformations. They allow exploring and studying the properties of the transformed object using the properties of the original object (line, surface and figure) and the properties of the transformation. Cremona transformations occupy a special place in the set of one-to-one nonlinear transformations. Construction of one-parameter (stratifiable) transformations is carried out as one-parameter set of plane transformations, both linear and non-linear ones. The plane, in which the specific transformation is prescribed, moves in space by a certain law forming a one-parameter set of planes. The set of such plane transformations makes up the space transformation. Findings. The designed graphics algorithms and the established transformation equations allow building the visual images of transformed surfaces and conducting their research by analytical geometry methods. Originality. By completing elementary algebraic transformations of this equation, we obtain the cissoids equation. If the plane ^ is continuously moved parallel to itself, it results in occurrence of surface, whose carcass will be the set of cissoids and the set of front-projecting lines. Practical value. The considered set of stratifiable algebraic transformations gives an effective means for exploring new curves and surfaces obtained by transforming the known algebraic lines and surfaces. These graphic algorithms allow graphically depicting the transformed lines and surfaces. The considered procedure of drawing up analytical formulas of specific transformations allows us to study the transformed surfaces and lines using the methods of analytic geometry. The above transformations can be of arbitrary high order, which is especially important during the design of complex technical surfaces such as aircraft components, parts of water and gas turbines, supports of the structures subject to strong flow of liquid, etc. Space modelling issues, including the building of graphic plane models of space, are relevant both in theoretical terms and in terms of application of the non-linear surfaces investigated on their basis for constructing the technical forms of parts and aggregates of construction machine movable elements, the middle surfaces of shells, the surfaces of turbulent blade, etc.

Keywords: space modelling; quasi-linear model; space transformation; non-linear surface; graphic design; axiomatic design

Extremely important and characteristic ability Introduction

of our mind is the process which consists in the fact that we relate things to things.

R.Y. Dedekind

The idea of relating two objects provides a powerful tool for learning new objects and their properties, as soon as the rules are set - the law of correspondence between these two objects. Regarding the geometry this law is determined by

Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету залiзничного транспорту, 2016, № 3 (63)

specifying a definite geometric transformation that transforms one object into another.

Geometric transformations are very diverse. We consider the so-called point transformations of space. In this case, each point in space is assigned with another definite point in the same space, and vice versa. This transformation is called one-to-one.

Analytically the point transformation is determined by formulas.

X = F (',Y',Z'),

Y = F (X', Y', Z'),

Z = F3 (X', Y', Z '),

where: (X ,Y, Z) - coordinates of the initial point of the pre-image, and (X \Y', Z') -coordinates of the transformed point-image. Functions F1, F2, F3 can be linear or nonlinear. In the first case, the transformation will be one-to-one, in the second case, as a rule, multi-value.

Methodology

The most important, in our view, are one-to-one transformations. They allow exploring and studying the properties of the transformed object using the properties of the original object (line, surface, figure) and the properties of the transformation.

Cremona transformations occupy a special place in the set of one-to-one nonlinear transformations; they are named after L.Cremona, who presented a coherent theory of plane non-linear transformations. The fundamental theorem of Cremona plane transformations about the ability to factorize any transformation into quadratic product was proven in the late XIX century. An attempt to prove a similar theorem for Cremona space transformations have been to date unsuccessful. In this regard, we study only some groups of transformations and their particular types. Without going deeply into the theory of Cremona transformations we refer the interested reader to the sources [6, 11, 12].

At present, much attention is paid to the study and construction of the so-called stratifiable transformations. [2, 4, 5, 13]. Construction of one-parameter (stratifiable) transformations is carried

out as one-parameter set of plane transformations, both linear and non-linear ones. The plane, in which the specific transformation is prescribed, moves in space by a certain law forming a one-parameter set of planes. The set of such plane transformations makes up the space transformation.

The problem of studying such transformations is relevant both in theoretical terms and in terms of application for constructing the technical forms of parts and aggregates, construction machines running in the flow of liquid or gas (bridge supports, the surface of the turbulent blades of water and gas turbines, surfaces of shells) etc.

The purpose of this work is to design and study the space transformations on the basis of plane transformations that transform straight lines into algebraic curves of any order with (n -1) multiple singular point and vice versa.

Before proceeding to the design of space transformations we give some information from the theory of algebraic curves [1, 10].

1. Plane algebraic line is a line defined by an algebraic function of the coordinates of its points in the form of:

F (X, Z ) = 0, or Z = f (X ),

(1)

Another way to define the curve is a parametric representation for which its current coordinates are set individually as a function of some parameter:

X = X (t ),Z = Z (t).

(2)

Excluding the parameter t from the equations (2), we obtain the equation of the same curve in the form (1) and vice versa. From equations (1) we can obtain the parametric representation of curve.

2. The highest degree of the polynomial F (X, Z) is called the curve order (1). The curve order is determined by the number of curve intersection points with an arbitrary line.

3. The algebraic curve of m -th order, is gener-

n (n + 3)

ally determined by ^—- points.

4. Two algebraic curves d and h of the order m and n meet at the points M,N respectively.

5. The multiple point (irregularity) of curve is called the point, where several curve branches meet: forming double, triple, etc. points according

Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету з^зничного транспорту, 2016, № 3 (63)

to the order n of the curve. Indecomposable curve of n order cannot have points of multiplicity higher

(n -1)( n - 2) n -1 and more than ---of double points.

An algebraic curve may not have multiple points at all, or have less than the specified limits.

Curve genus or genre is the number p that is the difference between the largest number of double points, which may belong to the curve of this order, and their actual number on a given curve. This definition is equally valid if the curve has the points of

k (k -1)

higher multiplicity, providing that k is for ——-

of double points. If the curve is of zero genre (i.e., it has the maximum possible number of double points), it has an important property: the coordinates of its points can be expressed as rational functions of some parameter.

These curves are called unicursal. Every curve having a point of the highest possible multiplicity (n -1) is a unicursal curve. Any line passing through this point intersects the curve only in one more point. Consequently, between the points of this curve and any line we can establish one-to-one correspondence with central projection, if the point (n -1) of multiplicity is taken as the projection centre.

6. If the multiple point (n -1) is taken as the origin of coordinates, then the curve equation can be written in the following form

fn (X,Y) + fn_x (X,Y) = 0,

(3)

where Fn and F(n-i) - homogeneous polynomials in

relation to X and Y to n and n -1 power respectively.

Let us now construct a stratifiable space transformation generated by the curves of the type (3). In the space rectangular coordinate system 0 ^ (Fig. 1)

we plot the curve s in the frontal plane (. In this system, the curve s will have the equation

fn (X ', Z')-fn-\ (X', Z ') = 0

(4)

Let us plot (n -1) - the multiple point on the Y-axis at the point 0 ', and through the point of its intersection with the axis X - A1 draw the horizontal projecting line t.

Any line d , passing through the origin of coordinates will intersect the curve 5 at a single point A ' ( 5 - unicursal curve), and the straight t at the point A. Thus, all the points of the curve 5 can be projected at the point of the line t and vice versa, i.e. one-to-one transformation is recognized. In this transformation the straight line t will correspond to the curve 5, and vice versa. The curve 5 will correspond to the straight line t.

The equation of the line d :

Z ' = KX ',

(5)

where K - slope of the straight line.

Solving the combination of equations (4) and (5) we obtain the coordinates of the point A'.

X ' =

Z ' =

fn-\ (\, K)

fn (\, K) ' Kfn-\ (\, K)

fn ( K )

These coordinates will correspond to the coordinates of the point A( X, Y).

Since the coordinate X of the point A on the line t equals the coordinate X ' of the point A ' on the curve s , then the first of them can be determined as the coordinate of the intersection point of the curve s with the axis X . It has to be done in each case of the transformation, having the defined curve s .

For example, the representative of the set of curves s (see Fig. 1) is Maclaurin trisector, third-order curve with a double point ((n -1) -fold )0':

a (Z2 - 3X2) + X (X2 + Z2) = 0.

To determine the point of intersection of this curve with the axis X we suppose Z = 0, and then we have:

-3aX2 + X3 = 0, X2 = 0 - coordinate of the point of intersection Aj with its axis X .

Thus, in each particular case we can determine the transformation formulas in the plane. (/).

Moving the straight line t together with the point A1 of the curve s1 along the axis X we obtain a set of horizontally projecting straight lines

Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету з^зничного транспорту, 2016, № 3 (63)

ro and the corresponding bundle of curves s. Moving the plane f with the transformation set on it, parallel to itself so that the multiplicity point (n -1) of the curve s would move along the axis

Y, we obtain a space transformation, in which ro2 of the projecting lines will match the ro2 of the curves s .

The set of projecting straight lines and curves f are perspective regarding the horizontal projection plane, so this plane in the transformation remains fixed and standard.

Findings

In each of the planes f there is the same plane transformation, that is why the space transformation is stratifiable, and the coordinates Y of the corresponding points remain unchanged.

Any curve s when moving circumscribes the cylinder with a cross-section s . This cylinder within the space transformation corresponds to the profile plane p.

Fig. 2

Fig. 1

Let us construct, first geometrically, a particular form of space transformation. The circumference will act as a unicursal curve. In the space rectangular coordinate system 0 ^ (Fig. 2) we define

an arbitrary point A(A1, A2). The coordinate planes

0xy and 0xz are taken as the horizontal and frontal

planes of the projections, respectively. Let us plot the frontal plane ^(q, %) through the point A .

Fig. 3

In this plane, on the segment AlT2, as on diameter, we draw a circumference f . It is tangent to the lines t and % . We plot the half ray TAx through the point T c 5 . It crosses the circumference f at the point A '. In other words, we have built a central projection of the point A from the centre T to the circumference f . Thus, one-to-one transformation between the points t and the circumference 5 was found. Each point A of the straight line t corresponds on the circumference f a single point A \ and vice versa. The point T corresponds to the infinite point Aiœ. The whole circumference f corresponds to the straight line t . Each frontal plane has a similar correspondence, and their set makes a

Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету залiзничного транспорту, 2016, № 3 (63)

space point transformation in which the circumferences si form the cylinder; the projecting straight lines ti appear on the normal cross-section 5i of the cylinder fi . Frontal projecting lines AA1 are transformed into the cylinder elements.

The algorithm for building the corresponding points on the complex drawing:

1. Produce the frontal plane ^ through the set point A( Ai, A2) (Fig. 3);

2. Draw a circumference at x coordinates of this point, as on diameter;

3. Through the point T(T1, T2) belonging to ^, draw the straight line d(d1,d2) in the plane ^ ;

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4. The line d passes through the point A and crosses the circumference 5 at the point A ' ;

5. Points A and A ' correspond to each other in this transformation [8].

Now we form the equation of this transformation. The circle f ( f1, f2) is written as the equation

X2 + Z2 = r\ r = 0'0 = T2

We transfer the origin of coordinates to the point T .

: r2.

(X - r )+ Z2 = Let us transform this expression

X2 -2rX + r2 + Z2 = r2, X2 - 2rX + Z2 = 0.

(6)

Equation (6) is the equation of the circle S(S1,S2) relative to the point S(S1,S2) as the origin of coordinates:

The equation of the line d relative to the same origin

7 7' 7 X Z = KX, where K = — = — or — = — (7) XX' Z' X'

We solve together the equations (6), (7) and get

X'2 - 2rX' + K2 X'2 = 0;

X ' (( - 2r + K2 X' ) = 0; X' = 0 - point 0 = T2; X'-2r + K2X' = 0;

X ' =

X '(1 + K2 ) = 2r; 2r 2r 2rX2

1 + K2 , Z2 X2 + Z2

1+ -T-

X2

but since 2r = X (Fig. 2), we have:

X ' = ■

X3

. . This formula makes it possible to

X2 + Z2

determine the coordinate X ' of the transformed point A' by the coordinates X, Z of the initial point A.

Substituting into the equation (6) instead of the variable X its value from (7) and producing a transformation similar to the above, we obtain:

Z ' = -

2 , 72 .

X2 + Z

Let us write the formulas of direct space transformation:

X ' =

X3

Z ' =

X2 + Z2

Y = Y ; X2Z

(8)

2 , 72 •

X2 + Z

The same procedure is for the formulas of inversion transformation:

X =

X'2 + Z'2

Z =

X Y = Y; Z ' ( X2 + Z '2 )

X2

(9)

Originality and practical value

The transformation formulas (8) and (9) show that the third order (cubic) transformation transforms the profile plane X = 2r into the frontal projecting cylinder. This is easily seen by substituting x in its equation with its expression from the first transformation formula (9):

Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету залiзничного транспорту, 2016, № 3 (63)

X2 + Z' X'

= 2r, X'2 - 2rX' + Z2 = 0 .

The set of front-projecting lines of this plane is transformed into the set of cylinder elements, and the set of horizontally-projecting straight lines -into the set of cylinder circumferences.

The horizontal plane is transformed into the surface of the third order. The complex figure (Fig. 4) shows a horizontal plane y. Let us consider the transformation in the plane (((() || n2. We take an arbitrary point A(A1,A2) on the plane Y in the plane (. And according to the known algorithm we graphically build its image A'(A 'j, A '2) . To do this, we draw through the origin of coordinates the line O' A(O' A13 O' A2). Front projection O \ A2 will pass through the origin O = O \. On the segment OAx, as on diameter, we build a circumference S'(S S \) . The point A'(A A '2) of intersection of the circumference with the line O' A will correspond to the point A(A13 A2) in the transformation. The set of

points A' will make up the curve of the third order - cissoid of Diocles.

Using the transformation formulas (9) we write its equation as an image of the straight line Z = 2a . In the equation of the line we substitute the coordinate Z with its value from the third formula (9):

Z ' (x'2 + Z'2)

X

= 2a.

After completing elementary algebraic transformations of this equation, we obtain the following cissoid equation:

X'2 =-

Z

2a - Z

This equation shows that the cissoid is an algebraic curve of the 3rd order. It is symmetrically relative to the axis Z, and the line Z = 2a is its asymptote, and the origin of coordinates is a cusp of the 1st kind [3].

If the plane ( is continuously moved parallel to itself, it results in occurrence of the surface, whose carcass is the set of cissoids and the set of front-projecting straight lines (Figure 5) [9, 7].

fi A T

ЕЛ У

f- 5', 0'. \Ч

A A'

Fig. 4

Fig. 5

Conclusions

1. The considered set of stratifible algebraic transformations gives an effective means for exploring new curves and surfaces obtained by transforming the known algebraic lines and surfaces.

2. These graphic algorithms allow graphically depicting the transformed lines and surfaces.

3. The considered procedure of drawing up analytical formulas of specific transformations allows us to study the transformed surfaces and lines using the methods of analytic geometry.

4. The above transformations can be of arbitrary high order, which is especially important during the design of complex technical surfaces such as aircraft components, parts of water and gas turbines, supports of the structures subject to strong flow of liquid, etc.

Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету залiзничного транспорту, 2016, № 3 (63)

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2Каф. «Графжа», Дтпропетровський нацюнальний утверситет залiзничного транспорту iм. В. Лазаряна, вул. Лазаряна, 2, Дншропетровськ, Украша, 49010, тел. +38 (067) 724 47 22, ел. пошта ulchenkotv@ya.ru, ORCID 0000-0003-2354-7765

3*Каф. «Графжа», Днтропетровський нацюнальний унiверситет залiзничного транспорту iм. В. Лазаряна, вул. Лазаряна, 2, Дншропетровськ, Украша, 49010, тел. +38 (067) 586 45 74, ел. пошта pro-f@ukr.net, ORCID 0000-0003-1340- 0284

4Каф. «Графжа», Дтпропетровський нацюнальний унiверситет залiзничного транспорту iм. В. Лазаряна, вул. Лазаряна, 2, Дншропетровськ, Украша, 49010, тел. +38 (067) 774 17 47, ел. пошта 19brit18@ukr.net, ORCID 0000-0002-1383-9863

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Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету залiзничного транспорту, 2016, № 3 (63)

ТРАНСПОРТНЕ БУД1ВНИЦТВО

ВЗАеМНО ОДНОЗНАЧН1 НЕЛ1Н1ЙН1 ПЕРЕТВОРЕННЯ ПРОСТОРУ З ТОТОЖНОЮ ПЛОЩИНОЮ

Мета. Робота спрямована на дослiдження геометричних перетворень. Ми будемо розглядати так зваш «точковЬ> перетворення простору. Методика. Найбшьш важливим е взаемно однозначш перетворення. Вони дозволяють за властивостями вихщного об'екта (лшп, поверхш, фiгури) i властивостями перетворення дослщжувати та вивчати властивостi перетвореного об'екта. У безлiчi взаемно однозначних нелшшних перетворень особливе мiсце займають Кремонови перетворення. Конструювання однопараметричних (розша-рованих) перетворень здiйснюеться як безлiч однопараметричних плоских перетворень (лiнiйних i нелшш-них). Площина, в якш задано конкретне перетворення, перемiщуеться в просторi по визначеному закону, утворюючи безлiч однопараметричних площин. Сукупнiсть таких плоских перетворень становить просторо-ве перетворення. Результата. Авторами сконструйоваш графiчнi алгоритми i виведенi рiвняння перетворення, що дозволяють будувати наочш зображення перетворених поверхонь та здшснювати 1х дослвдження методами аналггачнох геометри. Наукова новизна. Виконавши елементарнi алгебраíчнi перетворення цього рiвняння, отримаемо рiвняння цисо1д. Якщо площину ф безперервно перемiщувати паралельно самiй собi, то утворюеться поверхня, каркасом яко1 буде безлiч цисо1д i безлiч фронтально-проекцшних прямих. Практична значимiсть. Розглянута безлiч розшарованих алгебра1чних перетворень дае ефективний зааб вивчення нових кривих i поверхонь, одержуваних перетворенням ввдомих алгебра1чних лiнiй та поверхонь. Наведенi графiчнi алгоритми дозволяють наочно зобразити перетвореш лшп та поверхнi. Дослiджена методика складання аналiтичних формул конкретних перетворень дозволяе вивчати перетвореш лшп та поверхш методами аналггачнох геометри. Розглянуп перетворення можуть бути як завгодно високого порядку, що особливо важливо при конструюванш складних техшчних поверхонь типу агрегатiв лiтальних апарапв, деталей водяних i газових турбш, опор споруд, що знаходяться в сильному потоцi рвдини, та ш. Питання мо-делювання простору, в тому чи^ побудова графiчних площинних моделей простору, актуальнi як у теоретичному плаш, так i в планi застосування дослщжених на 1х основi нелiнiйних поверхонь для конструювання техшчних форм деталей та агрегапв робочих оргашв будiвельних машин, серединних поверхонь оболо-нок, поверхонь турбулентних лопаток та ш.

Ключовi слова: моделювання простору; квазшншш моделi; перетворення простору; нелшшш поверхнi; графiчна конструкцiя; аксiоматична конструкщя

А. Д. МАЛЫЙ1, Т. В. УЛЬЧЕНКО2, А. С. ЩЕРБАК3*, Ю. Я. ПОПУДНЯК4, Т. В. СТАРОСОЛЬСКАЯ5

1Каф. «Графика», Днепропетровский национальный университет железнодорожного транспорта им. В. Лазаряна, ул. Лазаряна, 2, Днепропетровск, Украина, 49010, тел. +38 (056) 713 5649, эл. почта malyjanatolij@gmail.com, (ЖСГО 0000-0002-2710-7532

2Каф. «Графика», Днепропетровский национальный университет железнодорожного транспорта им. В. Лазаряна, ул. Лазаряна, 2, Днепропетровск, Украина, 49010, тел. +38 (067) 724 47 22, эл. почта ulchenkotv@ya.ru, (ЖСГО 0000-0003-2354-7765

3*Каф. «Графика», Днепропетровский национальный университет железнодорожного транспорта им. В. Лазаряна, ул. Лазаряна, 2, 49010 Днепропетровск, Украина, тел. +38 (067) 586 45 74, эл. почта pro-f@ukr.net, (ЖСГО 0000-0003-1340-0284

4Каф. «Графика», Днепропетровский национальный университет железнодорожного транспорта им. В. Лазаряна, ул. Лазаряна, 2, Днепропетровск, Украина, 49010, тел. +38 (067) 774 17 47, эл. почта 19brit18@ukr.net, (ЖСГО 0000-0002-1383-9863

5Каф. «Графика», Днепропетровский национальный университет железнодорожного транспорта им. В. Лазаряна, ул. Лазаряна, 2, Днепропетровск, Украина, 49010, тел. +38 (066) 791 35 94, эл. почта simatn@rambler.ru, ОЯСГО 0000-0002-3851-9612

Наука та прогрес транспорту. Вкник Дншропетровського нацюнального ушверситету зашзничного транспорту, 2016, № 3 (63)

ТРАНСПОРТНЕ БУД1ВНИЦТВО

ВЗАИМНО ОДНОЗНАЧНЫЕ НЕЛИНЕЙНЫЕ ПРЕОБРАЗОВАНИЯ ПРОСТРАНСТВА С ТОЖДЕСТВЕННОЙ ПЛОСКОСТЬЮ

Цель. Работа направлена на исследование геометрических преобразований. Мы будем рассматривать так называемые «точечные» преобразования пространства. Методика. Наиболее важными являются взаимно однозначные преобразования. Они позволяют по свойствам исходного объекта (линии, поверхности, фигуры) и свойствам преобразования исследовать и изучать свойства преобразованного объекта. Во множестве взаимно однозначных нелинейных преобразований особое место занимают Кремоновы преобразования. Конструирование однопараметрических (расслояемых) преобразований осуществляется как однопараметрическое множество плоских преобразований (линейных и нелинейных). Плоскость, в которой задано конкретное преобразование, перемещается (преобразуется) в пространстве по определенному закону, образуя однопараметрическое множество плоскостей. Совокупность таких плоских преобразований составляет пространственное преобразование. Результаты. Авторами сконструированы графические алгоритмы и выведены уравнения преобразования, позволяющие строить наглядные изображения преобразованных поверхностей и осуществлять их исследование методами аналитической геометрии. Научная новизна. Выполнив элементарные алгебраические преобразования этого уравнения, получим уравнение циссоиды. Если плоскость ф непрерывно перемещать параллельно самой себе, то образуется поверхность, каркасом которой будет множество циссоид и множество фронтально-проецирующих прямых. Практическая значимость. Рассмотренное множество расслояемых алгебраических преобразований дает эффективное средство изучения новых кривых и поверхностей, получаемых преобразованием известных алгебраических линий и поверхностей. Приведенные графические алгоритмы позволяют наглядно изобразить преобразованные линии и поверхности. Рассмотренная методика составления аналитических формул конкретных преобразований позволяет изучать преобразованные линии и поверхности методами аналитической геометрии. Исследованные преобразования могут быть как угодно высокого порядка, что особенно важно при конструировании сложных технических поверхностей типа агрегатов летательных аппаратов, деталей водяных и газовых турбин, опор сооружений, находящихся в сильном потоке жидкости, и др. Вопросы моделирования пространства, в том числе построение графических плоскостных моделей пространства, актуальны как в теоретическом плане, так и в плане применения исследованных на их основе нелинейных поверхностей для конструирования технических форм деталей и агрегатов рабочих органов строительных машин, срединных поверхностей оболочек, поверхностей турбулентных лопаток и др.

Ключевые слова: моделирование пространства; квазилинейные модели; преобразование пространства; нелинейные поверхности; графическая конструкция; аксиоматическая конструкция

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Prof. S. S. Tyshchenko, Sc. Tech. (Ukraine); Prof. V. D. Petrenko, Sc. Tech. (Ukraine) recommended

this article to be published

Accessed: Feb., 2. 2016

Received: May, 11. 2016

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