SAEX1033 BE Aero Computer Aided Design and Analysis Sathyabama University

Register Number

                               

SATHYABAMA UNIVERSITY

(Established under section 3 of UGC Act,1956)

Course & Branch :B.E – AERO                                     Max. Marks:80

Title of the Paper :Computer Aided Design and Analysis

Sub. Code :SAEX1033(2010)                                                Time : 3 Hours

Date :13/05/2014                                                            Session :AN

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                                       PART - A                    (10 x 2 = 20)

                        Answer ALL the Questions

1.     Define wireframe and surface model.     

2.     Differentiate CSG and B-rep.

3.     Define rotation. Give the importance of pivot point.

4.     What do you understand by concatenation?

5.     Write the limitations of feature technology in CAD.

6.     In your view, what are the two most-vital reasons the CAD data exchange standards have been developed?

7.     Write the shape function for 1D, 2 noded linear bar element.

8.     Are nodal point and Node distinct? Justify each if distinct?

9.     Write the functions of Preprocessor.

10.   List the Hardware requirements of Pre and Post processor.

PART – B                       (5 x 12 = 60)

Answer All the Questions

11.   (a)  What is geometric modeling? Compare and contrast the various modeling techniques.                                                     (5)

        (b) How are solid modelers categorized? Explain the generic architecture of any solid modeler. Name some popular solid modelers.                                                                                 (7)

(or)

12.   (a) What is CAD and what are its applications and benefits?

        (b) What are the hardware requirements of a CAD workstation? Explain. 

13.   What is transformation of geometry? With suitable figure and matrix discuss following transformation:

(i) Scaling       (ii) Reflection                 (iii) Rotation

(or)

14.   Explain the three types of coordinate systems used to input, store and display model geometry and graphics.

15.   Explain the salient features of any two modeling package that are being currently used in the aircraft industry. Which factors influence the selection of a particular package?

(or)

16.   How feature technology is being initiated in a CAD system? Explain about the classification of features and its design. State its applications in aircraft structures.

17.   Derive an expression for stiffness matrix of one dimensional truss element.

(or)

18.   Determine the support reaction R1 and R 3 for stepped bar shown in figure

        P₁ = 60 kN, P₂ = 75 kN

E₁ = E₂ = E₃   =  200 GPa

A₁= 24 cm², A₂= 12 cm², A₃ = 7 cm²

1 GPa = 10⁹ N/m²

19.   Derive the shape function for the constant strain triangular element (CST).

(or)

20.   What are the capabilities of a typical general purpose FEA Package? Enumerate various type of design problem that could be handled by FEA.

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