CURVES  IN ENGINEERING An attempt on lucidity & holism   PON.RATHNAVEL
Syllabus Conics – Construction of ellipse, Parabola and hyperbola by eccentricity method – Construction of cycloid and inv...
WHY CURVES? CIVIL ENGINEERING Bridges, Arches, Dams, Roads, Manholes etc. MECHANICAL ENGINEERING Gear Teeth, Reflector Lig...
JUMBLE ? U O L C S
LOCUS SET OF POINTS GIVEN CONDITIONS PATH Vs LOCUS Locus is a collection of points which share a property.  It is used to ...
CURVE A curve is considered to be  the locus of a set of points  that satisfy an algebraic equation
CLASSIFICATION CURVES CONIC SECTIONS ENGINEERING CURVES 1. CIRCLE 2. ELLIPSE 3. PARABOLA 4. HYPERBOLA 5. RECTANGULAR HYPER...
STICKING TO SYLLABUS Theory CONICS ROULETTES INVOLUTES Practical ELLIPSE PARABOLA HYPERBOLA CYCLOID INVOLUTE OF SQUARE INV...
CONIC SECTIONS  (A) CONICS <ul><li>The curves obtained by the intersection of a cone by cutting plane in different positio...
KEEP WATCHING
KEEP WATCHING
KEEP WATCHING
KEEP WATCHING
KEEP WATCHING
DEFINING CONICS Curve Position of Cutting Plane Circle Perpendicular to axis and parallel to the base Ellipse Inclined to ...
ELLIPSE Ellipse is defined as the locus of points the sum of whose distances from two fixed points, called the  foci , is ...
PARABOLA Parabola is defined as the locus of points whose distances from a fixed point, called the focus, and a fixed line...
HYPERBOLA Hyperbola is defined as the locus of points whose distances from two fixed points, called the foci, remains cons...
ROULETTES A cycloid is a curve generated by a point on the circumference of a circle as the circle rolls along a straight ...
ROULETTES CYCLOID CYCLOID – THE QUARREL CURVE OR THE HELEN OF GEOMETRY
ROULETTES CYCLOID CYCLOID – THE QUARREL CURVE OR THE HELEN OF GEOMETRY
ROULETTES An epicycloid is a curve generated by a point on the circumference of a circle which rolls on the outside of ano...
ROULETTES EPICYCLOID
ROULETTES EPICYCLOID
ROULETTES A hypocycloid is a curve generated by a point on the circumference of a circle which rolls on the inside of anot...
ROULETTES HYPOCYCLOID
ROULETTES HYPOCYCLOID
ROULETTES A trochoid is a curve generated by a point either inside or outside the circumference of a circle that rolls alo...
ROULETTES EPITROCHOID An epitrochoid is a curve generated by a point either inside or outside the circumference of a circl...
ROULETTES HYPOTROCHOID A hypotrochoid is a curve generated by a point either inside or outside the circumference of a circ...
INVOLUTES An involute is a curve traced by a point as it unwinds from around a circle or polygon. The concerned circle or ...
INVOLUTES
INVOLUTES
INVOLUTES
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  1. 1. CURVES IN ENGINEERING An attempt on lucidity & holism PON.RATHNAVEL
  2. 2. Syllabus Conics – Construction of ellipse, Parabola and hyperbola by eccentricity method – Construction of cycloid and involutes of square and circle – Drawing of tangents and normal to the above curves. 10 hours Synopsis Introduction to Curves – Classification of Curves – Introduction to Conics, Roulettes and Involutes Terminology in Curves - Properties of Conics, Roulettes and Involutes - Construction of ellipse by eccentricity method - Construction of Parabola by eccentricity method - Construction of hyperbola by eccentricity method – Construction of cycloid – Construction of Involute of square – Construction of Involute of Circle 05 periods
  3. 3. WHY CURVES? CIVIL ENGINEERING Bridges, Arches, Dams, Roads, Manholes etc. MECHANICAL ENGINEERING Gear Teeth, Reflector Lights, Centrifugal Pumps etc ECE Design of Satellites, Missiles etc, Dish Antennas, ECG & EEG Machines CSE & IT Computer Graphics, Networking Concepts ENGINEERING GRAPHICS EXAM 2 Marks - 4 & 15 Marks - 1
  4. 4. JUMBLE ? U O L C S
  5. 5. LOCUS SET OF POINTS GIVEN CONDITIONS PATH Vs LOCUS Locus is a collection of points which share a property. It is used to define curves in a geometry.
  6. 6. CURVE A curve is considered to be the locus of a set of points that satisfy an algebraic equation
  7. 7. CLASSIFICATION CURVES CONIC SECTIONS ENGINEERING CURVES 1. CIRCLE 2. ELLIPSE 3. PARABOLA 4. HYPERBOLA 5. RECTANGULAR HYPERBOLA <ul><li>CYCLOIDAL CURVES/ROULETTES </li></ul><ul><li>a.Cycloid </li></ul><ul><li>b.EpiCycloid </li></ul><ul><li>c.Hypocycloid </li></ul><ul><li>d.Trochoids(Superior & Inferior) </li></ul><ul><li>e.Epitrochoids(Superior & Inferior) </li></ul><ul><li>f.Hypotrochoids(Superior&Inferior) </li></ul><ul><li>INVOLUTE </li></ul><ul><li>SPIRALS </li></ul><ul><li>a.Archimedian </li></ul><ul><li>b.Logarithmic </li></ul><ul><li>c.Hyperbolic </li></ul><ul><li>HELICES </li></ul><ul><li>a.Cylindrical </li></ul><ul><li>b.Conical </li></ul><ul><li>5. SPECIAL CURVES </li></ul>
  8. 8. STICKING TO SYLLABUS Theory CONICS ROULETTES INVOLUTES Practical ELLIPSE PARABOLA HYPERBOLA CYCLOID INVOLUTE OF SQUARE INVOLUTE OF CIRCLE
  9. 9. CONIC SECTIONS (A) CONICS <ul><li>The curves obtained by the intersection of a cone by cutting plane in different positions are called conics. </li></ul><ul><li>The conics are </li></ul><ul><li>CIRCLE </li></ul><ul><li>ELLIPSE </li></ul><ul><li>PARABOLA </li></ul><ul><li>HYPERBOLA </li></ul><ul><li>RECTANGULAR HYPERBOLA </li></ul>
  10. 10. KEEP WATCHING
  11. 11. KEEP WATCHING
  12. 12. KEEP WATCHING
  13. 13. KEEP WATCHING
  14. 14. KEEP WATCHING
  15. 15. DEFINING CONICS Curve Position of Cutting Plane Circle Perpendicular to axis and parallel to the base Ellipse Inclined to the axis and not parallel to any generator. Angle of Cutting Plane > Angle of Generator Parabola Inclined to axis, parallel to generators and passes through the base and axis Hyperbola Inclined to the axis and not parallel to any generator. Angle of Cutting Plane < Angle of Generator Rectangular Hyperbola Parallel to the Axis and Perpendicular to the Base
  16. 16. ELLIPSE Ellipse is defined as the locus of points the sum of whose distances from two fixed points, called the foci , is a constant.
  17. 17. PARABOLA Parabola is defined as the locus of points whose distances from a fixed point, called the focus, and a fixed line, called the directrix, are always equal.
  18. 18. HYPERBOLA Hyperbola is defined as the locus of points whose distances from two fixed points, called the foci, remains constant.
  19. 19. ROULETTES A cycloid is a curve generated by a point on the circumference of a circle as the circle rolls along a straight line without slipping. The rolling circle is called generating circle and the line along which it rolls is called base line or directing line. CYCLOID
  20. 20. ROULETTES CYCLOID CYCLOID – THE QUARREL CURVE OR THE HELEN OF GEOMETRY
  21. 21. ROULETTES CYCLOID CYCLOID – THE QUARREL CURVE OR THE HELEN OF GEOMETRY
  22. 22. ROULETTES An epicycloid is a curve generated by a point on the circumference of a circle which rolls on the outside of another circle without sliding or slipping. The rolling circle is called generating circle and the outside circle on which it rolls is called the directing circle or the base circle. EPICYCLOID
  23. 23. ROULETTES EPICYCLOID
  24. 24. ROULETTES EPICYCLOID
  25. 25. ROULETTES A hypocycloid is a curve generated by a point on the circumference of a circle which rolls on the inside of another circle without sliding or slipping. The rolling circle is called generating circle/hypocircle and the inside circle on which it rolls is called the directing circle or the base circle. HYPOCYCLOID
  26. 26. ROULETTES HYPOCYCLOID
  27. 27. ROULETTES HYPOCYCLOID
  28. 28. ROULETTES A trochoid is a curve generated by a point either inside or outside the circumference of a circle that rolls along a straight line without slipping. When the point is inside the circumference of the circle, it is called inferior trochoid. If it is outside the circumference of the circle, it is called superior trochoid. An inferior trochoid is also called prolate cycloid. A superior trochoid is also called curtate cycloid. TROCHOID
  29. 29. ROULETTES EPITROCHOID An epitrochoid is a curve generated by a point either inside or outside the circumference of a circle that rolls along the outside of an circle without slipping. When the point is inside the circumference of the circle, it is called inferior epitrochoid. If it is outside the circumference of the circle, it is called superior epitrochoid.
  30. 30. ROULETTES HYPOTROCHOID A hypotrochoid is a curve generated by a point either inside or outside the circumference of a circle that rolls along the outside of an circle without slipping. When the point is inside the circumference of the circle, it is called inferior hypotrochoid. If it is outside the circumference of the circle, it is called superior hypotrochoid.
  31. 31. INVOLUTES An involute is a curve traced by a point as it unwinds from around a circle or polygon. The concerned circle or polygon is called as evolute.
  32. 32. INVOLUTES
  33. 33. INVOLUTES
  34. 34. INVOLUTES
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