TEQIP Workshop on MODAL ANALYSIS

17th - 21st September 2018


Organizers

About the Workshop

Understanding the nature of vibrations is essential to avoid vibration induced problems. This workshop will introduce the science and practice of modal analysis as a technique to solve vibration related problems. A thorough review of vibration theory will renew and expand the participant’s understanding of vibrations thereby facilitating a focus on the practical implementation of experimental modal analysis testing. The workshop will motivate the ideas behind testing structures and obtaining a mathematical description of their dynamic behaviour. Concepts of digital processing of measurements, excitation and measurement techniques, details and functioning of vibration measuring instruments and detailed analysis of measured data will form the mainstay of this workshop. Laboratory sessions will provide instructive guidelines for dynamic testing, selection/placement considerations of sensors and actuators, and for system identification using modal parameter extraction methods. The workshop will motivate solutions for testing, monitoring and diagnosis of common vibration related problems found in Academia and in Industries.

Objectives

  • To review the basics of the theory and practice of modal analysis
  • To introduce experimental methods in modal analysis
  • To introduce and review digital signal processing of measurements
  • To introduce estimation and extraction of modal parameters (natural frequencies, damping and mode shapes) from measured data
  • To introduce construction of mathematical models from extracted modal parameters
  • To introduce advanced topics on dynamic substructuring, modal reduction, modal expansion, model updating, and vibration testing of weakly nonlinear structures

Projected Outcomes

  • Get familiar with theoretical and practical aspects of structural dynamics
  • Develop the ability to plan for experimental testing of structural vibrations
  • Gain understanding of sensor and actuator selection and placement
  • Gain understanding of the importance of digital signal processing of measurements, and its impact on quality of measured data
  • Gain the ability to reconstruct mathematical models describing the structure based on experimental modal analysis
  • Appreciate role of modal analysis in system identification, model updating, and condition monitoring

Selection

Maximum number of participants allowed in this course will be 30. Selection will be made on the basis of relevant background (in vibrations) of potential participants. Preference will be given to TEQIP faculty and research scholars, followed by non-TEQIP participants, followed by participants from Industry and R&D labs.

Boarding and Lodging

Arrangements will be made to accommodate all participants on twin sharing basis at the Guest House (Visitor's hostel (VH)) of IIT Kanpur. Food will be arranged at the VH for all the participants. Food and lodging will be completely free for TEQIP faculty participants, and will be covered in the registration fee for all other participants.

Participation and Fees

TEQIP participants

The course will be made open for the faculty and research scholars of TEQIP quality circle institutes under IIT Kanpur. Participants from TEQIP quality circle institutes of other IITs will also be welcome.No participation fees will be charged for TEQIP participants.

Non-TEQIP participants

Participants from non-TEQIP institutions will also be welcomed. TEQIP office may decide on an appropriate registration fee from such potential participants. Registration fee can cover all boarding and lodging costs.

Industry and R&D lab participants

Technical personnel working Industries and facing vibration related issues, or wanting to learn and/or enhance their modal analysis skills will also be encouraged to participate. Participants from Industry and R&D labs can also be charged a registration fee, which the TEQIP office can decide on such as to cover all boarding and lodging costs.

Course Content

  • Overview of modal analysis
  • Theoretical basis for modal analysis
    • Vibration of single and multiple degree of freedom (SDOF, MDOF) systems
    • Frequency response functions (FRFs) for SDOF/MDOF systems. Types of FRFs.
    • Theory of undamped, proportionally damped, and non-proportionally damped SDOF/MDOF systems
    • Orthogonality of modes and their application in modal analysis
  • FRF measurement considerations
    • Introduction to test planning
    • Role of excitations signals and techniques. Discussions on measurement transducers
    • Discussions on aliasing, leakage, windowing, filtering and averaging
    • Revision of Fourier analysis and Fourier transforms
    • Calibration. Dealing with measurement noise and coherence
  • Modal parameter extraction and derivation of mathematical models
    • Preliminary checks of FRF data (spectrum, coherence, etc.)
    • Detection of modes – mode indicator functions
    • Extraction of modal parameters (natural frequencies, damping ratios and shapes) using frequency domain and time-domain methods
    • Reconstruction of spatial models from modal and response models
  • Experimental modal analysis
    • Laboratory sessions to demonstrate Chaldni patterns and calibration
    • Measure frequency response functions to investigate role of transducer mounting, check for reciprocity, and to investigate role of boundary conditions
    • Measurements using impact hammers and modal shakers
    • Measurements for modal parameter extraction
    • Measurements of real test structures such as machine tools, turbines etc.
  • Applications and advanced topics
    • Model correlation. Concepts of modal assurance criterion and its variants
    • Finite element model updating. Model reduction and expansion
    • Dynamic substructuring
    • Testing of weakly nonlinear structures

List of Speakers

Dr. Shakti Gupta


Dr. Mohit Law


Mr. Pradeep Kumar


Dr. Suparno


Dr. Madhusudhan, ADA Bangalore


Registered Participants

Sr. Name Institute
1Nishit YadavNalanda College of Engineering, Nalanda(Bihar)
2Avinash KumarNalanda College of Engineering, Nalanda(Bihar)
3Abhimanyu DhyaniBaba Ghulam Shah Badshah University,Rajouri ,J&K
4Ankur J. ShahS.V. N.I.T. , Surat, Gujarat
5Mukesh DhakaNalanda College of engineering Chandi Nalanda Bihar
6Bhanu PrakashAligarh Muslim University, Aligarh
7Arpit A. ParikhS.V. N.I.T. , Surat, Gujarat
8ANANTHAKRISHNA A TIIT Madras
9 Mr Aslam Pasha TajAce Designers Limited
10Vishnu SinghDarbhanga College of Engineering, Darbhanga, Bihar
11SHAH ADITYA DIPAKKUMARVISVESVARAYA NATIONAL INSTITUTE OF TECHNOLOGY, NAGPUR
12MARWAN AHMED ABDULLAH SUFYANAligarh Muslim University, AMU
13Akarsh VermaIIT Roorkee
14Vineet PaliwalIIT Madras
15Rakesh Erappa JinagaNational Institute of Technology, Calicut
16HARI PRASAD CHINTHAVISVESVARAYA NATIONAL INSTITUTE OF TECHNOLOGY, NAGPUR
17Chandan KumarLNJPIT Chapra
18Kadam Shirish VIlasraoDr Babasaheb Ambedkar Technological, University
19Sarvesh Kumar YadavMuzaffarpur Institute of Technology, Muzaffarpur
20Dinesh Kumar Pasi Shri G. S Institute of Technology & Science, Indore
21Nishith Kumar SinghVisvesvaraya National Institute of Technology, Nagpur
22Shravan KumarMMMUT Gorakhpur (UP)
23Annu RaniGovind Ballabh Pant University of Agriculture & Technology, Pantnagar
24Anurag MaheshwariF.E.T, M.J.P. Rohilkhand University, Bareilly, U.P
25Vivek Mani TripathiU.P Textitle Technology Institute
26Manish ThakurDUMKA ENGINEERING COLLEGE
27Gaurav KumaarGovind Ballabh Pant University of Agriculture & Technology, Pantnagar
28PRASHANT KUMAR SINGHDarbhanga College of Engineering, Darbhanga
29Vaqas Hussain SheikhIslamic University of Science and Technology.
30Suhail AhangarIslamic University of Science and Technology.
31Umar RashidIslamic University of Science and Technology.
32Alok Kumar Singh Lok Nayak Jay Prakash Institute of technology,Chapra(LNJPIT)
33Falah Hasan AbdulsadahAligarh Muslim University, AMU
34Antara BhattacharjeeNational Institute of Technology, Rourkela
35Madan Chandra MauryaMadan Mohan Malaviya University of Technology, Gorakhpur
36Sadaf NazirInstitute of Engineering and Technology, Bundelkhand University, Jhansi
37SindhuInstitute of Engineering and Technology, Bundelkhand University, Jhansi
38Himanshu PorwalUFI Filters India
39Abid HussainUFI Filters India
40HemanshuPranav Vikas India Pvt. Ltd. Faridabad
41Nipun VashishthPranav Vikas India Pvt. Ltd. Faridabad

Tentative Schedule

DAY/TIME 09:00 - 10:30 10:30 - 11:00 11:00 - 12:30 12:30 - 14:00 14:00 - 15:30 15:30 - 16:00 16:00 - 17:30
Day 1 Introductions and Overview of workshop
Dr. Shakti Gupta/Dr. Mohit Law
T
E
A
Theoretical basis of modal analysis (SDOF)
Dr. Shakti Gupta
L
U
N
C
H
Theoretical basis of modal analysis (MDOF)
Dr. Shakti Gupta
T
E
A
Frequency response functions
Dr. Mohit Law
Day 2 Measurement considerations
Dr. Mohit Law
Fourier Analysis
Mr. Pradeep Kumar
Digital signal processing-1
Dr. Mohit Law
LAB 1
Day 3 Digital signal processing-2
Dr. Mohit Law
Modal parameter extraction (peak picking)
Dr. Mohit Law
LAB 2 LAB 2

5:00PM -6:30 PM Dr. Shakti Gupta
Day 4 Modal parameter extraction (residue)
Dr. Mohit Law
Modal parameter extraction (time domain)
Dr. Suparno
LAB 3 Ground vibration testing of planes
Dr. Madhusudhan
Day 5 Modal analysis for continuous systems 1
Dr. Shakti Gupta
Modal analysis for continuous systems 2
Dr. Shakti Gupta
LAB 4 Open discussions/Closure

For labs, assuming a total of 40 participants, there will be four groups of 10 each, i.e. G1-G4. These groups will be formed randomly on Day 2 of the workshop.

Lab 1 sessions: venue: Machine tool dynamics lab (MTDL) + Hatwal’s lab + classroom (FB370)
Lab 1 Main: Calibration (accelerometer); Influence of sensor mounting; Influence of hammer tip selection
Lab 1 D1: Demonstrate Chaldni patterns on a plate mounted on a shaker (understand shaker, amplifier)
Lab 1 D2: Shaker working principle (electro-magnetic; electro-hydraulic) (Hatwal’s lab)
Lab 1 D3: Accelerometer working principle (FB370)

TIME Lab 1 Main; MTDL Lab 1 D1; MTDL Lab 1 D2; Hatwal’s lab Lab 1 D3; FB370
3:45 pm – 4:30 pm G1 G2 G3 G4
4:30 pm – 5:15 pm G2 G3 G4 G1
5:15 pm – 6:00 pm G3 G4 G1 G2
6:00 pm – 6:45 pm G4 G1 G2 G3

Lab 2 sessions: venue: Machine tool dynamics lab + Vibration lab + Hatwal’s lab
Lab 2 Main: Influence of fixed and free-free boundary conditions (MTDL)
Lab 2 D1: 2DOF vibration absorber experiment (Vibration lab)
Lab 2 D2: Transmissibility experiment (Vibration lab)
Lab 2 D3: Calibration of hammer (Hatwal’s lab)

TIME Lab 2 Main; MTDL Lab 2 D1; Vibration lab Lab 2 D2; Vibration lab Lab 2 D3; Hatwal’s lab
3:45 pm – 4:30 pm G1 G2 G3 G4
4:30 pm – 5:15 pm G2 G3 G4 G1
5:15 pm – 6:00 pm G3 G4 G1 G2
6:00 pm – 6:45 pm G4 G1 G2 G3

Lab 3 sessions: venue: Machine tool dynamics lab + SMSS + Hatwal’s lab
Lab 3 Main: Modal analysis of a freely supported plate (roving hammer)
Lab 3 D1: Modal analysis of a freely supported plate (roving sensor with a fixed shaker)
Lab 3 D2: Laser vibrometer demonstration (SMSS lab)
Lab 3 D3: Active/passive damping demonstration (MTDL)

TIME Lab 2 Main; MTDL Lab 2 D1; Hatwal’s lab Lab 2 D2; SMSS lab Lab 2 D3; MTDL
2:00 pm – 2:45 pm G1 G2 G3 G4
2:45 pm – 3:30 pm G2 G3 G4 G1
3:30 pm – 3:45 pm G3 G4 G1 G2
3:45 pm – 4:30 pm G4 G1 G2 G3

Lab 4 sessions: venue: Machine tool dynamics lab + SMSS + Hatwal’s lab
Lab 4 Main: Modal analysis of a machine tool; reciprocity check
Lab 4 D1: Vibration of a continuous beam (Vibration lab)
Lab 4 D2: Anechoic chamber visit*
Lab 4 D3: Civil Engineering structural dynamics lab visit*

TIME Lab 2 Main; MTDL Lab 2 D1; Vibration lab Lab 2 D2; Anechoic chamber Lab 2 D3; CE lab
2:00 pm – 2:45 pm G1 G2 G3 G4
2:45 pm – 3:30 pm G2 G3 G4 G1
3:30 pm – 3:45 pm G3 G4 G1 G2
3:45 pm – 4:30 pm G4 G1 G2 G3



Knowledge Incubation for TEQIP IIT Kanpur