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CURVES IN ENGINEERING An attempt on lucidity & holism PON.RATHNAVEL
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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
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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.
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CURVE A curve is considered to be the locus of a set of points that satisfy an algebraic equation
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STICKING TO SYLLABUS Theory CONICS ROULETTES INVOLUTES Practical ELLIPSE PARABOLA HYPERBOLA CYCLOID INVOLUTE OF SQUARE INVOLUTE OF CIRCLE
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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>
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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
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ELLIPSE Ellipse is defined as the locus of points the sum of whose distances from two fixed points, called the foci , is a constant.
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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.
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HYPERBOLA Hyperbola is defined as the locus of points whose distances from two fixed points, called the foci, remains constant.
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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
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ROULETTES CYCLOID CYCLOID – THE QUARREL CURVE OR THE HELEN OF GEOMETRY
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ROULETTES CYCLOID CYCLOID – THE QUARREL CURVE OR THE HELEN OF GEOMETRY
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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
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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
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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
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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.
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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.
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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.
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