Challenge 5 : Concept Modeling of Car Bumper
A-Surface Concept Modeling of Front Bumper
Objective:- To develop a conceptual design of the Front bymper from the given blue print
Introduction:- To create a front bumper using the Autodesk Alias. AutoStudio 2021 software is used. Autodesk Alias is a family of Computer-aided industrial design software predominantly used in Automotive Design and Industrial Design for generating Class A surfaces using Bézier surface and NURBS modelling method. ALIAS uses NURBS surface and can be converted to Bezier's surface for more accuracy of continuity. In this exercise we use NURBS surface(we are not converting to NURBS surface) for the surface generation.
Design Methodology:-
Description:-
The measurement box(rectandular box) is created based on the dimensions given in the blueprint.
Which signifies the length, width and height. The outside Boundary of the vehicle is defined by the measurement box.
The given blueprint is laoded to ALIAS.
Adjusted to the required size by scaling up/scaling down.
The image is assigned to layer and set to Reference.
side view inside the box:
Front view inside the box
The required Curves and surfaces are generated as per the blue print.
I have used freeform blend,Skin,birail,square options to generate the surface.
Setting the degrees to 4 and span to 1.
The degree can be increased for further accuracy of the currve.
The below image shows the degree is set to 4 and span to 1.
The curve is aligned using G0.
The surfaces are created usign Square and ensured positional continuity(G0) with adjacent surface is maintained.
Image showing the positional continuity with the adjacent surface.
The HORVER(Horizontal Vertical Diagnostic Shader) is selected for checking the continuity between the sufaces.
The corresponding curves surfaces based on the blueprint is generated
Surface trimming
Surface Symmetry
Adding required holes and slot to the surface are added along with the edge fillets.
To add the slots, the curve is generated and projected to the surface.
The surface is trimmed as per the based on the projectedd curves.
To add the edge fillet the 2 surfaces to be filleted are added and the required radius is provided to the edge fillet.
Image of Curve and assigned to layer
Tools Used:-
Pick
Nothing:- Used to deselect a partiular object
Object:- It is used to select a line,curve,surface
CV's:- It is used to select a CV curve
COS:-(Curve on surface) - It is used to select the curve generated on a surface either through Project
Transform
Move:- It is used to move a particular object in prescribed direction.
If we want the object in X-axis, then left mouse button is clicked(free form movement without any constaints in X-direction)
If we want the object in y-axis, then middlemouse button is clicked(free form movement without any constaints in Y-dirextion)
If we want the object in Z-axis, then right mouse button is clicked(free form movement without any constaints in Z-dirextion)
To snip the curve point to point, then Alt+left mouse button is selected.(it snips on the toggle grid)
To move the curve on another curve, then ctrl+alt+left mouse button is selected.
Rotate:- It is used to rotate a object in the prescribed direction.
If we want to rotate the object along X-axis(YZ plane), then left mouse button is selected
If we want to rotate the object along Y-axis(XZ plane), then middle mouse button is selected
If we want to rotate the object along Z-axis(XY plane), then right mouse button is selected
Scale:- It is used to scale down the image up and down.
Scaled up:- the image is selected and scrolled to the right.
Scaled sown:- the image is selected and scrolled to the left.
Curves
CV CRV:- It is used to generate a curve. The DoF can be increased to increase the number of vertex.
The more the DoF the more the vertex. The vertex is used to modify the curve.
Blend:- Is used to combine 2 curve into 1. The tangency of the curve can be adjusted by using the keypoint option.
Surface Edit
Project:- It is used to project a 3D curve to a 2D surface.
The surface is selected and the required curve is projected on to the surface of the curve.
Trim:- It is used to seperate a surface based on the required profile.
eg:- The projected surface can be used to trim the surface. The Selected surface of a side can be kept/discarded as needed.
Intersect:- To generate a curve between the 2 intersecting surface.
Untrim:- The profile of a trimmed surface can be undone to the previous existing profile using trimming.
Surface
Planar:- A surface can be generated from a closed circle or profile using this planar.
Skin:- 2 adjacent faces of a surface can be joined using Skin.
BiRail:- The generation curves and Rail curves needs to be selected for the serface edge of 2 surfaces. We have option to select 1,2,2_ generation curves and 1,2 rail curves.
Views
Front View
Side View
Top View
Final Model:-
G-drive link:- https://drive.google.com/file/d/1r6BPYAkddUs3SlT5jTYsje7jVohiM0sg/view?usp=sharing
Conclusion:- The Concept modeliing of Front Bumper using ALIAS is generated by tracing the curve.