VTU Mechanical Engineering (Semester 7)
Smart Materials
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Define composite materials. Explain the structural composite material with suitable sketch.
6 M
1 (b) Explain electromagnetic phenomenon and state the key features of electromagnetic materials.
6 M
1 (c) Explain the concept of dynamics and control of smart structures and mention the application of smart structures in different fields.
8 M

2 (a) Explain magnetic sensors and their applications in motion control system.
10 M
2 (b) Describe the current generation actuator materials and give 2 examples.
10 M

3 (a) What do you mean by ER fluid? Explain with examples, the application of ER fluids in different modes. Also state the advantages of ER fluids.
10 M
3 (b) What are MR Dampers? How do you measure the force exerted by dampers and explain with neat sketches.
10 M

4 (a) What is fibre optic technology? Explain the application of fibre optic technology.
10 M
4 (b) Explain the characteristics of active and adaptive optical system and components.
5 M
4 (c) What are MR fluids? Give two examples in which MR fluids find application.
5 M

5 (a) List the advantages of fibre optic sensors in smart structures.
10 M
5 (b) Explain with neat sketch, principles of light transmission through optical fiber by total internal reflection and role in cladding material.
10 M

6 (a) Explain analog and digital feedback control systems with neat sketch.
10 M
6 (b) Discuss about acoustic control system and active noise control products.
10 M

7 (a) Explain the basic process of means with flow chart.
6 M
7 (b) Explain the structure of magnetic shape memory actuator with neat sketch.
6 M
7 (c) What are vibration absorbers? Explain Frahm vibration absorber with neat sketch.
8 M

8 (a) Explain the neural networks and their uses.
5 M
8 (b) Explain the role of PZT actuators in smart structures.
5 M
8 (c) Explain data visualization and data reliability.
10 M



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