VIRTUAL SMART STRUCTURES AND DYNAMICS LAB

Transcription

1 DEPARTMENT OF CIVIL ENGINEERING, IIT DELHI VIRTUAL SMART STRUCTURES AND DYNAMICS LAB Dr. Suresh Bhalla Associate Professor Department of Civil Engineering Indian Institute of Technology Delhi Hauz Khas, New Delhi Tel: (011) Fax: (011)

2 Virtual Labs An Initiative of the Ministry of Human Resource Development (MHRD) under the National Mission on Education Through Information Communication and Technology (ICT)

3 Website: One common website to access all Virtual Labs

4 PARTICIPATING INSTITUTES IIT Delhi IIT Guwahati IIT Bombay IIT Kanpur IIT Kharagpur COE Pune IIT Roorkee IIIT Hyderabad Amrita University Dayalbagh University NITK Surathkal

5 Types of Virtual Labs Remote Triggered Measurement Based Modeling / Simulation Based

6 REMOTE TRIGGERED (RT) LAB PHYSICAL LAB.. AT CENTRAL LOCATION..

7 .ACCESIBLE TO DISTANT USERS THROUGH INTERNET..

8 RT LAB BECOMES VIRTUAL LAB AT STUDENT S PC

9 SIMULATION LAB A back-end end, possibly consisting of a simulation-engine running on a server

10 MEASUREMENT LAB A back-end end, possibly consisting of previous experimental data running on a server

11 SMART STRUCTURES AND DYNAMICS LABORATORY (SSDL) SSDL was set up in the year 2007 by Dr. Suresh Bhalla Aims to carry research towards the development of new SENSORS AND TECHNIQUES based on SMART MATERIALS for STRUCTURAL HEALTH MONITORING, BIOMECHANICS, ENERGY HARVESTING and other interdisciplinary applications involving structural dynamics. Completed 4 Ph. D thesis and 03 ongoing CompletedC l t d 25 M. Tech. projects and 04 ongoing Completed 64 B. Tech. projects and 02 ongoing.

12 KEY RESEARCH AREAS (1) Electro-Mechanical Impedance (EMI) Technique for structural health monitoring i (2) Developing Cost-Effective Variants of EMI technique (3) Integration of EMI technique with low-frequency global dynamic techniques (4) Modelling sensor-structure interaction and shear lag (5) Energy harvesting (6) Bio-mechanics (7) Metal wire based EMI technique for structural health monitoring

13 VIRTUAL SMART STRUCTURES & DYNAMICS LABORATORY (VSSDL) This is virtual component of SSDL

14 VSSDL IN USE FOR PG COURSEWORK AT IIT DELHI

15 PEOPLE Dr. Suresh Bhalla, Founder and Coordinator Mr. Bijay Verma Mr. Sujeet Tandon Ms Naveet Kaur Ms Susmita Naskar Research Scholar (M. Tech.) (Team Leader) Creative Team Mr. Lal Singh, JLA Maintenance and Operations Team

16 SMART MATERIALS Have ability to change their physical properties in a specific manner due to a certain specific type of stimulus input Piezoelectric materials Electro-rheological Fluids Shape Memory Alloys Optical Fibres U.S. Army Research Office Workshop on Smart Materials, Structures and Mathematical Issues, September 15-16, 1988, Virginia Polytechnic Institute & State University.

17 SMART MATERIALS (1) Stress Piezoelectric i (1) Electric Charge (2) Electric field Material (2) Mechanical strain Heat Shape Memory Alloy Original Memorized Shape Electric field Electro-rheological Fluid Change in viscosity (Internal damping) Temperature, pressure, mechanical strain Optical Fibre Change in Opto- Electronic signals Magnetic field Magneto-strictive material Mechanical Strain

18 Additional resources in videos

19 PIEZO- ELECTRIC C MATERIALS

20 PIEZOELCTRIC MATERIALS Mechanical Stress T Direct Effect Electrical Charge T + Electric Field E Converse Effect - Mechanical Strain Deformation

21 PIEZOELCTRIC MATERIALS (Constitutive relations) 3 Strain T S = 1 1 Y Stress E + d E w E 11 + d 31 E 3 Electric field h a l T 1 T D = ε E + d T Charge density Electric field Stress 8/4/2014 Used for sensor applications zero 21

22 DIRECT EFFECT (SENSOR) Using Q D A = Q = 3 CV V = d E hy 31 S = ks ε T Vl Voltage α Strain Sensitivity = 200mV/μm/m / 8/4/2014

23 RESPONSE USING PZT PATCH volt tage(volts) time(s)

24 RESPONSE: FREQUENCY DOMAIN T1 (FFT of voltage) FF Frequency(Hz)

25 SMART STRUCTURES According to Ahmad (1988) A system or structure which has built-in or intrinsic sensor(s), actuator(s) and control mechanism(s) whereby it is capable of sensing a stimulus, responding to it in a predetermined manner and extent, in a short/ appropriate time, and reverting to its original i state as soon as the stimulus is removed

26 1. INTRODUCTION ONLINE COURSE ON SMART MATERIALS AND STRUCTURES UNDER QEEE 2. CONCEPT OF SMART MATERIALS AND STRUCTURES 3. PIEZOELECTRIC MATERIALS: THEORY AND APPLICATIONS 4. PIEZOELECTRIC MATERIALS: THEORY AND APPLICATIONS 5. FIBRE OPTIC MATERAILS: THEORY AND APPLICATIONS 6. FIBRE OPTIC MATERAILS: THEORY AND APPLICATIONS 7. SHAPE MEMORY ALLOYS

27 ONLINE COURSE ON SMART MATERIALS AND STRUCTURES 8. SMART MATERIALS IN STRUCTURAL HEALTH MONITORING 9. SMART MATERIALS IN STRUCTURAL HEALTH MONITORING 10. SMART MATERIALS IN STRUCTURAL HEALTH MONITORING 11. SMART MATERIALS IN BIO-MECHANICS 12. SMART MATERIALS IN VIBRATION CONTROL 13. SMART MATERIALS IN ENERGY HARVESTING 14. SMART MATERIALS IN ENERGY HARVESTING 15. SMART MATERIALS IN METAL WIRE BASED EMI TECHNIQUE

28 VIRTUAL SMART STRUCTURES AND DYNAMICS LABORATORY (VSSDL) Department of Civil Engineering, IIT Delhi An initiative of Ministry of Human Resource Development (MHRD), under the National Mission of Education through ICT ABOUT VIRTUAL SMART STRUCTURES AND DYNAMICS LABORATORY Welcome to Virtual Smart Structures and Dynamics Laboratory (VSSDL) This laboratory provides platform to inquisitive students to perform basic experiments related to smart structures and structural dynamics, either remotely or through simulation. A smart structure is defined as a structural system having built-in or intrinsic sensors, actuators and control mechanism, whereby it is capable of sensing a stimulus, responding to it in a predetermined manner and extent, in a short time, and reverting to its original state as soon as the stimulus is removed. In the present context, the structures have been instrumented with smart piezoelectric material based sensors, which inform the status (here dynamic characteristics) to the user. Dr. Suresh Bhalla Associate Professor Lab Founder and Coordinator, VSSDL (Co-PI, Virtual Labs Project) sbhalla@civil.iitd.ac.in Areas of Interest: Structural health monitoring Smart materials and structures Non-destructive evaluation Tensegrity structures Experimental structural identification Adaptation and transfer of aerospace technologies to civil engineering Bio-mechanics Energy Harvesting Lack of resources has always been a hurdle to perform experiments, especially when they involve sophisticated and expensive instruments. Also, good teachers are always a scarce resource. Web-based and video-based courses address the issue of teaching to great extent. Joint experiments by two participating institutions and also sharing costly resources has always been a challenge. With the development of virtual labs, above limitations can no more hamper students and researchers in enhancing their skills and knowledge. Web enabled experiments have been designed for remote operation and viewing so as to motivate the students. The Civil Engineering Department provides the service of Virtual Laboratory via this website: Two types of experiments are covered: Remote trigger type (Experiments 1 to 4) and Simulation type (Experiments 5 to 8) TRIGGER BASED Basic idea and types of virtual lab experiments Physical Lab at IIT-Delhi triggered remotely View at student s PC SIMULATION BASED Simulation based lab at student s PC Remote address to faculty members and students of colleges participating under QEEE VSSDL TEAM MEMBERS Ms Naveet Kaur (RS) Ms Susmita Naskar (TA) SPECIAL QEEE PILOT (01 Feb 15 April 2014) This pilot provided a complete learning management system that included web-resources, video-lectures, animated demonstrations and self evaluation. VSSDL successfully provided a platform of advanced learning to 11 colleges. Dr. Suresh Bhalla interacting with 11 engineering colleges in India at multiple locations using A-VIEW Team members (Naveet and Susmita) demonstrating how to perform experiments Faculty and students interacting with Dr. Bhalla and team on how to perform Virtual lab experiments Visit:

29 BRIEF DESCRIPTION OF EXPERIMENTS REMOTE TRIGGER BASED EXPERIMENTS Experiment 1 Vibration Characteristics of Cantilever Beam Using Piezoelectric Sensors Experiment 2 Identification of High Frequency Modes of Beam in Free-Free Conditions Using Electro- Mechanical Impedance (EMI) Technique Experiment 3 Forced Excitation of Steel Beam Using Portable Shaker Experiment 4 Photogrammetry for Displacement Measurement SIMULATION BASED EXPERIMENTS Experiment 5 Modes of Vibration of Simply Supported Beam Experiment 6 Modes of Vibration of Simply Supported Plate Experiment 7 Damage Detection and Qualitative Quantification Using Electro-Mechanical Impedance (EMI) Technique Experiment 8 Dynamics of Bandra Worli Sea Link Brigde CLOSER TO REALITY SCALABILITY