ASHWIN U

Mr. Ashwin U. did his Master’s Degree in Machine Design and Bachelor’s Degree in Mechanical Engineering from Visvesvaraya Technological University, Belgaum. He is currently working in the Dynamics and Adaptive Structures Group, Structural Technologies Division, Since August 2009. He has published 3 International Journals and 10 International Conferences, in the area of smart structures and systems. He was part of the team that won the NAL Technology award for the project titled “Instrumentation on Dornier Aircraft”.

Area of Interest

• Finite Element Modelling, Analysis and Qualification of Aircraft Components for its static, dynamic strength and Fatigue loading.
• Structural Health Monitoring of aircraft structure using wave based techniques
• Active Vibration Control and Isolation using Piezoelectric Transducers.

On-going Activities

• Analysis of Installation Design for Military Helicopter Upgrade
• Flutter Analysis through GVT data and Similarity Approach
• Active Strut for Vibration and Noise Suppression
• Structural Health Monitoring of Stiffened Composite Aircraft Panels using Lamb Waves

Expertize

Stress qualification (static, dynamic & fatigue) of LRU installation and its certification

Structural load computation for different flight conditions

Computational Mechanics (Finite Element formulation for structural & piezoelectric elements)

Smart Structures & Systems (Active Vibration Control and Structural Health Monitoring)

Achievements

As part of development of Lamb wave based SHM methodologies

Designed and developed of 28-noded triangular spectral finite element for modelling, simulation and analysis of Lamb wave propagation in plate structures

Detection and localization scheme for structural damages and impact event using Lamb waves based on geodesic algorithm and MFC rosettes

As part of stress qualification LRU installations on Mi-17 / Mi17 V5 Helicopter program

Been a prominent member in the execution of the project “S-0-303: Analysis of Installation Design for Military Helicopter Upgrade” for the Mi-17 & Mi-17 1V helicopters.

Developed and standardized finite element analysis procedures for upgradation programs, such as qualifying new installations in the Mi-17 & Mi-17 1V helicopters and its certification from RCMA

Performed flight condition limit load analysis, emergency crash landing load analysis, rotor induced harmonic excitation analysis & fatigue life estimation for installations on Mi-17 & Mi-17 1V rotorcraft based on MIL-STD-8591, MIL-STD-1290A, AR-56 & MIL-STD-810G

Performed Thermal analysis of RACK & Radio Compartment Installations in Mi-17 & Mi-17 1V rotorcraft and its qualification based on MIL-HDBK-5400 & MIL-STD-1472

As part of structural load team

Designed and developed the MATLAB code to compute structural design load for airframe

As part of the team computed structural design loads for SARAS MKII aircraft

As part of GVT based flutter analysis

Developed Thin-Plate-Spline (TPS) based technique to interpolate GVT measured vibration data of the aircraft to its finite element model for the purpose of flutter analysis. This methodology included coding the TPS technique; coordinate transformation for modelling out-of-plane surfaces & automated handling of interaction between the GVT & FE model for interpolation.

Built numerical dynamics model of the Mirage 2000 aircraft, Su 30 MKI aircraft, Jaguar aircraft, Hawker-800 with stores installations by interpolating the GVT measured dynamics data to finite element model of the aircraft.

As part of design and development of active strut for vibration control application

Designed, developed the active strut concept for actuating tensile & compressive loads, which was a major drawback of the previous design due to short coming of the piezo-stack actuators, which cannot be subjected to tensile loads

Conceptualization & Design of model shaker using MFC actuators

As part of the 12FYP with CSIR-4PI

Finite element modelling and analysis of Indian Tectonic plate, where the thickness variation in the tectonic plate was captured by portioning the peninsular India into four major regions. Finite element analysis was performed to capture the tectonic plate deformation.

Papers published in International Journals

Ashwin U., S. Raja, D. Dwarakanathan, “Finite element formulation for reduced order modelling of smart structural systems”, International conference on Smart Structures and Systems (ISSS), 24-26 July 2008, Paper id – 66

Ashwin U., S. Raja, C.N. Sathyanarayana, Formulation of 36-noded piezoelectric spectral finite element scheme with active/passive layers coupled by Lagrange multipliers, 2014, Smart Materials and Structures, (Impact factor: 2.502) UK       23 (8), pp. 5017          doi:10.1088/0964-1726/23/8/085017

Vijayakumar, M. P.; Ashwin, U.; Raja, S., Active Vibration Control of Engine Mount System of Transport Aircraft Using PZT Stack Actuators, 2014, Journal of Mechatronics, USA, 2 (3), pp. 226

Papers published in Conference Proceedings

Ashwin U., S. Raja, D. Dwarakanathan, “Finite element based substructuring procedure for design analysis of large smart structural systems”, International Journal of Smart Materials and Structures, under review

Ashwin U., Bhavana S. S. Patel, S. Raja, Damage identification and localization in plate structures, Dec. 2012, Third Asian Conference On Mechanics Of Functional Materials And Structures (ACMFMS – 2012)            Indian Institute of Technology, Delhi, ACMFMS 2012, IIT, Delhi

Abhilash R., Ashwin U., S. Raja, Nivedita Ramesh   A study on behavior of piezoelectric sensors on interface debonding in high frequency wave field         Apr. 2013, National Conference on New Horizons in civil Engineering (NHCE 2013), Manipal Institute of Technology, Manipal, NHCE 2013, MIT, Manipal

Mallesh N. G., Ashwin U., S. Raja, K. Balakrishna Rao, Modeling of elastic wave propagation in plate structures using spectral element method, Apr. 2013, National Conference on New Horizons in civil Engineering (NHCE 2013), Manipal Institute of Technology, Manipal       NHCE 2013, MIT, Manipal

Ashwin U., S. Raja, C. N. Sathyanarayana, Simulation of Elastic Wave Propagation in Plate Structures by Spectral Element Method, 16-17 Dec 2013, IIST Research Scholars’ Day Indian Institute of Space Science and Technology Dept. of Space, Govt. of India, Thiruvananthapuram – 695 547, India, IIST Research Scholars’ Day 2013

Ashwin U., S. Raja, C.N. Sathyanarayana, Spectral finite element based numerical modelling of panel with surface-mounted piezoelectric transducers   8-11, Jul. 2014, Seventh ISSS International Conference on Smart Materials Structures and System (ISSS - 2014)        Indian Institute of Science, Bangalore, ISSS, IISc, Bangalore

C.N. Sathyanarayana, Ashwin U., S. Raja     Detection of debonding in surface bonded PZT patches employing Lamb waves, 8-11 Jul. 2014, Seventh ISSS International Conference on Smart Materials Structures and System (ISSS 2014), Indian Institute of Science, Bangalore, ISSS, IISc, Bangalore

Ashwin U., S. Raja, C.N. Sathyanarayana Monitoring surface-mounted piezoelectric actuators / sensors for debond using Lamb waves, 29-31 Dec. 2014, Sixth International Conference on Theoretical, Applied, Computational and Experimental Mechanics (ICTACEM 2014), Indian Institute of Technology Kharagpur, ICTACEM, IIT Kharagpur

Ashwin U, Raja S, Sathyanarayana CN, Diagnosis of Piezoelectric Transducers using Voltage Amplitude Spectrum, July 5-8, 2017, Proc. of 8th ISSS International Conference on Smart Materials Structures and System (ISSS 2017), IISc-Bangalore, India

Sathyanarayana CN, Ashwin U Raja S, Numerical and Experimental Studies on Lamb Wave Propagation in Planer Stiffened Panels, January 23-25, 2018, Proc. of National Conference on Contributions of SC/ST Scientists and Technologists towards Advancement of Science and Engineering (NCSCSTASE 2018), CSIR-NAL, Bangalore, India

Ashwin U, CN Sathyanarayana, S Raja, Detection Of Damage In Surface-Mounted PZT Transducers Using Voltage Amplitude Spectrum 27Jun - 1Jul, 2016, The sixth International Congress on Computational Mechanics and Simulation (ICCMS2016), IIT, Bombay

Kausalya G, Ashwin U, Ashok Kumar S, S Raja and Katta Venkataramana, Detection of damage in curved plate structures using Lamb waves and geodesic distances, March 2-4, 2016, Proc. of 5th International Engineering Symposium (IES 2016), Kumamoto University, Japan

Radhika Harshini V, Ashwin U, Raja S, Katta Venkataramana and Sathyanarayana CN, Detection of damage in curved plate structures using Lamb waves and geodesic distances March 2-4, 2016, Proc. of 5th International Engineering Symposium (IES 2016), Kumamoto University, Japan