XI National Seminar on Aerospace Structures
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1 XI National Seminar on Aerospace Structures 8-9 Febraury 2002 Theme Experimental Techniques and Testing Methods Editors R. Balasubramaniam P. D. Mangalgiri N.G.VijayaVittala Organised by Aeronautics Research & Development Board and National Aerospace Laboratories Bangalore " UNiVEhCuATS HA\'NO TFCHN!r INFORMAT! ON ;. \' i - ; U t lit "K \ OT!-:f7K Allied Publishers Pvt. Ltd. NEW DELHI MUMBAI CALCUTTA CHENNAI NAGPUR AHMEDABAD BANGALORE HYDERABAD LUC KNOW
2 Contents Foreword Preface ix xi Prof. C. V. Joga Rao Memorial Lecture 1 Mini and micro air vehicles 3 V. J. Sundaram Plenary Session 13 Some important considerations and applications of experimental investigations for design and condition assessment of structural components and systems 15 T.V.S.R. Apparao Role of testing in launch vehicle structure development in ISRO 16 A. R. Acharya Structural testing for combat aircraft development 17 A. R. Upadhya Invited Papers 41 NDE and failure analysis of landing gear components of air crafts 43 Baldev Raj Analysis of flight flutter test data using advanced modal parameter estimators 54 Herman Van der Auweraer. Antonio Vecchio and Bart Peelers Structural analysis and testing of HANSA-3 aircraft for JAR-VLA certification 62 S. Viswanath Structural features testing for composite aircraft structures 75 Prakash D Mangalgiri The role and methodology of fatigue testing in aircraft structural integrity 85 B. K. Parida Experimental techniques for testing and analysis of flight vehicles 98 K. Jayathirtha Rao Helicopter Dynamics 115 Dynamic load measurements on helicopter rotor blades of Russian origin 117 K. Venkatarman. R. Anuuigiri. Balakrishna and K. K. Brahma Helicopter flight testing for evaluation of performance handling qualities, load and dynamics 123 B. P. Rao Design, analysis, testing and qualification of ALH airframe. tail boom and empennage I.' K. K. Mathen and Krishna Holla iii
3 Development experience on vibration isolation system for advanced light helicopter (ALH) 136 K. S. Narayana Rao Testing of mair rotor blades of advanced light helicopter 144 C. V. Venugopalan, B. Ramakrishnayya, S. S. Halejol.G. Sathyaprakash and P. Paulraj Design and testing of rotor hub and rotor blades for a mini helicopter 153 C. Venkatesan, S. P. Otta, N. K. R. Gupta. G. K. Singh and Y. K. Singh Dealing with sum & difference frequencies in high speed rotating machinery 161 Sanjay Barad, R. K. Giridhar, T. N. Suresh and P. S. Kasthuri Rangan Spacecraft/Launch Vehicles 169 Algorithm for signal analysis during the satellite sine vibration test 171 Ramachandra. A. R. Prasanth, B. S. Jagadesh Babu, J. N. Hemanta Kumar and N. K. Mishra Multi-channel programmable low pass filter in sine vibration control loop 179 B. R. Nagendra, V. Ramesh Naidu, A. R. Prasanth, J. N. Hemanta Kumar and N. K. Mishra Experimental studies on the dynamics of spacecraft in the presence of rotating elements 186 S. Shankar Narayan and P. S. Nair Angular relationship between two co-ordinate systems in association with electronic co-ordinate determination system 194 H. N. Suresha Kumar and B. S. Nataraju Updating of finite element model of launch vehicle using artificial neural network 202 Sajan Daniel, T. Sundararajan, S. Pattabiraman and K. L. Handoo Win View software for analysis of launch vehicle vibration, acoustics and shock data 206 G. Muthuraman. R. Arunkumar and A. H. Shanavas insrtial force estimation on a typical nozzle actuator assembly of a launch vehicle 214 M. R. Rama Murthy, D. Sundararajan, Shashikala Rajappa, Annamma Samuel and S. Janardhanam Fatigue and Fracture 223 Fatigue crack growth and fracture behaviour of carbon steel elbows 225 P. K. Singh. K. K. Vaze. H. S. Kushwaha. D. M. Pukazhendi, D. S. Ramachandra Murthy and S. Seetharaman Fatigue testing of riveted fuselage lap joint 239 Ami Bakare. Kanchan Biswas and M. S. Nadgir Full-scale fatigue testing of welded structures 249 H. Sahu. M. Udhayakumar and P. Rajagopalan iv
4 Low cycle fatigue life evaluation of high pressure pipe lines in a gas turbine engine 260 N. Sarangi, P. S. Chandrashekar and D. Mehta Fracture behaviour of carbon steel straight pipe with through-wall crack under cyclic loading 267 D. Venu Kumar, S. Seetharaman, DM. Pukazhendhi, D. S. Ramachandra Murthy, K. Gupta Sunil, V. Bhasin, K. K. Vaze, and H. S. Kushwaha Experimental and numerical studies of surface cracks in fatigue in a finite width plate K. Patel, B. Dattaguru and K. Ramachandra A concept for simulation of flight loads on the wing of a fighter airframe in a full-scale fatigue test 283 K. E. Girish, H. Sreedhara, R. K. Puty and P. K. Dash Damage tolerance evaluation of an integrally stiffened wing bottom skin panel of a transport airframe 290 H. Sreedhara, K. E. Girish, R. K. Puty and P. K. Dash Fatigue meter used for life extension of aircraft using damage assessment technique 297 Chinmayee Madhavan Assessment of static fracture strain under tension by finite element method in DDQ steel sheet 305 Y. S. Parmar, D. K. Sehgal, A. N. Kumar and L Pesek Noise and Vibration Control and Smart Concepts 313 Experimental mechanics pave way for bio-mimetic structures 315 K. A. Jacob Active modal vibration control of a car structure using discrete PVDF actuators and sensors 329 R. Ajay Kumar, Lothar Gaul, S. Kamle Control of beam vibrations using dc magnets 335 A. Joshi Implementation of the frequency domain LMS adaptive filter in MATLAB for active vibration control application 340 Shashikala Prakash, R. Balasubramaniam and U. P. V. Subha Passive vibration control of plate-like structures using shunted piezoceramics 349 S. B. Kandagal and Kartik Venkatraman Strain sensing using fiber-optic interferometry 355 P. C. V. Sarveswara Rao, T. Kiran Kumar, Kartik Venkatraman and C. R. L Murthy Testing and evaluation of electrical and related properties of shape memory wires used in active shape control of aerofoils 362 G. N. Dayananda and V. Shankar
5 Active vibration control of a laminated composite beam with direct output feedback control Raja, M. R. Rama Murthy, D. Sundararajan, Shashikala Rajappa, S. Janardhanam and Annamma Samuel Composites 377 Experimental study of the behaviour of GFRP stiffened and unstiffened cylindrical shells 379 V. Kalyanraman, R. Pandia Raj, and Pramod Kumar Parate Three dimensional stress analysis of composites multibolted joints C. Natesan and S. Ananda Kumar Investigation of vibration of composite plates using multilayered PZT sensors 394 V. R. Rao, S. Kamle, Om Prakash and N. G. R. Iyengar Ballistic impact of composites: A review 399 N. K. Naik, B. Chaitanya Kumar Reddy and Kamada Rahul The flexural and torsional constant of honeycomb sandwich construction 405 M. V. Kannan, K. Badari Narayana, B. R. Ananda Murthy, K. Haridas and C. S. Varghese Acoustic fatigue testing of CFRP specimens 416 Saraswathi Krishna, K. K. Brahma, D. S. Ramakrishna and R. Balasubramaniam Effect of laminate thickness on dynamic interlaminar fracture toughness 424 Prashant Kumar, N. N. Kishore and R. Pandey Composite hollow shaft an alternative to metallic shaft for airborne applications 432 V! Arun Kumar S. Jana and R. Lakshminarasimha Mechanical characterization of pultruded rods: effect of process parameters 440 Anirudh Warman, N. Vikas Kumar and N. K. Naik Static indentation of composites: effect of flexure and boundary conditions 447 M. Kumar, S. Rajasekaran, T. S. Ramamurthy and M. Venkat Rao Experimental investigations on instability of GRP plates under edge loads 455 K. Subramanian and V. Vijayalakshmi Dynamic Testing and Model Analysis 465 Free vibration characteristics of steel containment structure experiment and analysis 467 Veto Varma, G. R. Reddy, K. K. Vaze. H. S. Kushwaha, Sandeep Singh. K. K. Meher, A. Rama Rao and M. K. Arora Random decrement technique for estimation of modal damping 474 R. Neetha, M. N. G. Elayathu and K. L. Handoo Estimation of joint rotation constant through dynamic testing 490 M. Vasudevan Unni, R. Arunkumar, M. Krishnamoorthy, G. Muthuraman R. Neetha and S. Rajendran VI
6 Dynamic testing and analysis of a typical automobile bracket 495 G. Giridhar, S. Vinod, M. P. Murali, T. V. Srinivas, B.Mahesh and D. S. Ramakrishna SRS testing using electrodynamic shakers 501 M. Madheswaran, J. N. Hemanta Kumar, and N. K. Mishra Multipoint excitation technique for ground resonance testing of aerospace vehicles 511 G. A. Srinivasa Murthy, K. Kishore Kumar, K. E. Kapadia and B. S. Sarma Dynamic analysis of aviation electronic package 519 K. Velmurugan, P. Anil Kumar, D. N. Varma, P. Ramachandran, G. Krishna Rao and K. Jaythirtha Rao Modal analysis test on cylindrical section with aviation electronic package 529 P. Anil Kumar, D. N. Varma, K. Velmurugan, P. Ramachandran, G. Krishna Rao and K. Jayathritha Rao Static Testing and NDT of Structures 543 Instrumentation and response measurement of aircraft landing gears during strength test 545 K. Ravisankar, T. Narayanan, K. Kesavan, S. Parivallal and R. Narayanan Approaches to ultrasonic non-destructive evaluation of composite aircraft components 553 V. Srinivasa, M. Ramesh Kumar, H. N. Sudheendra and M. R. Madhava Experimental validation of CORE-SEIS: code for seismic analysis of PFBR core 560 Alok Gupta, P. Chellapandi, and S. C. Chetal Optimisation of SG support junction for PFBR 569 R. Srinivasan, R. Sureshkumar, P. Chellapandi, and S. C. Chetal Testing and certification of an in-service trainer aircraft for performance improvement 577 V. K. Kalyanam, P. V. K. Perumal and R. K. Jain Instrumentation for (Static & Dynamic) Testing 589 On the development of an apparatus for static and dynamic testing 591 R. Samuel, M. V. Rao, K. Haridas, A. Ananthan Digital vibration controller for classical shock testing 598 G. Muthuraman, P. Balachandran, R. Arunkumar, A. H. Shanavas Use of multimedia PC in experimental structural dynamics 604 S. Sadasivan, R. Sundaramurthy, S. Ravi Sekar, R. Kathiravan and B. Anil Kumar Experimental determination of wind loads on 200 m tall three-tower blocks 608 N. Lakshmanan, S. Arunachalam, S. Selvi Rajan, Ramesh Babu, and J. Shanmugasundaram Colour plates 617 Author Index 629 vii
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