Xu Research Group

Welcome to the Structural Health Assessment and Monitoring Laboratory (SHAML), where our mission is to advance the understanding of the intricate mechanics and dynamics of structures that are subjected to damage.

Research Vision

At SHAML, we leverage state-of-the-art digital signal acquisition and processing techniques, including laser Doppler vibrometry, computer vision, machine learning, and artificial intelligence, to detect the presence of structural damage with unparalleled precision and efficiency.

Our research is underpinned by the objective of enhancing the performance, reliability, and survivability of critical systems and platforms through effective damage identification and quantification. We are deeply committed to devising innovative solutions that push the boundaries of what is possible, whether through advanced analytical, numerical, or experimental techniques.

Our research team is dedicated to driving the field of structural health assessment and monitoring forward, and we invite you to join us on our mission to revolutionize the way we approach structural dynamics. Our work has significant implications for applications such as structural health monitoring (SHM) and non-destructive evaluation (NDE).

Research Areas

• structural dynamics

• structural health monitoring

• non-destructive evaluation

• metamaterials

• computer vision

• machine learning

• artificial intelligence

• digital signal processing

• modal analysis and vibration testing

• finite element modeling-test correlation

Sponsors

      

Journal Papers

1. W. Zhou, Y.F. Xu, 2022, ``Damage identification for beam-like structures based on proper orthogonal modes of guided wavefields", Mechanical Systems and Signal Processing, 189: 110052


2. W. Zhou, Y.F. Xu, J.S. Kim, 2022, ``Baseline-free structural damage identification for plate-like structures based on two-dimensional curvature propagating flexural waves", Journal of Sound and Vibration, 536, p.117098


3. W. Zhou, Z. Feng, Y.F. Xu, X. Wang, H. Lv, 2022, ``Empirical Fourier decomposition: an accurate signal decomposition method for nonlinear and non-stationary time series analysis", Mechanical Systems and Signal Processing, 163: 108155


4. Y.F. Xu, J.S. Kim, 2021, ``Baseline-Free structural damage identification for beam-Like structures using curvature waveforms of propagating flexural waves", Sensors, 21(7): 2453


5. W. Xu, W.D. Zhu, Y.F. Xu, M.S. Cao, 2020 ``A comparative study on structural damage detection using derivatives of laser-measured flexural and longitudinal vibration shapes", Journal of Nondestructive Evaluation, 39(3): 1-17


6. Y.F. Xu, D.-M. Chen, W.D. Zhu, 2020, ``Modal parameter estimation using free response measured by a continuously scanning laser Doppler vibrometer system with application to structural damage identification", Journal of Sound and Vibration, 485: 115536


7. J.S. Kim, Y.F. Xu, W.D. Zhu, 2020, ``Linear finite element modeling of joined structures with riveted connections", ASME Journal of Vibration and Acoustics, 142(2): 021008 (11 pages)


8. Y. Wang, K.S. Dai, Y.F. Xu, W.D. Zhu, W.S. Lu, Y.F. Shi, Z. Mei, S.T. Xue, K. Faulkner, 2020, ``Field testing of wind turbine towers with contact and non-contact vibration measurement methods", Journal of Performance of Constructed Facilities, 34(1): 04019094 (17 pages)


9. Y.F. Xu, 2020, ``Photogrammetry-based structural damage detection by tracking a visible laser line", Structural Health Monitoring - An International Journal, 19(1): 322-336


10. Y.F. Xu, 2020, ``A photogrammetry-based experimental modal analysis method by tracking visible laser spots", Measurement, 151: 106963


11. Y.J. Hu, W.G. Guo, W.D., Zhu, Y.F. Xu, 2019, ``Local damage detection of membranes based on Bayesian operational modal analysis and three-dimensional digital image correlation", Mechanical Systems and Signal Processing, 131: 633-648


12. D.-M. Chen, Y.F. Xu, W.D. Zhu, 2019, ``A comprehensive study on detection of hidden delamination damage in a composite plate using curvatures of operating deflection shapes", Journal of Nondestructive Evaluation, 38: 54


13. Y.F. Xu, D.-M. Chen, W.D. Zhu, 2019, ``Delamination identification of laminated composite plates using measured mode shapes", Smart Structures and Systems, An International Journal, 23(2): 195-205


14. Y.F. Xu, D.-M. Chen, W.D. Zhu, 2019, ``Operational modal analysis using lifted continuously scanning laser Doppler vibrometer measurements and its application to baseline-free structural damage identification", Journal of Vibration and Control, 25(7): 1341 - 1364


15. D.-M. Chen, Y.F. Xu, W.D. Zhu, 2018, ``Damage identification of plates under full-field measurement by using a continuously scanning laser Doppler vibrometer system", Journal of Sound and Vibration, 422: 542-567


16. D.-M. Chen, Y.F. Xu, W.D. Zhu, 2018, ``Non-model-based delamination identification of laminated composite plates using a continuously scanning laser Doppler vibrometer system", ASME Journal of Vibration and Acoustics, 140(4): 041001 (11 pages)


17. D.-M. Chen, Y.F. Xu, W.D. Zhu, 2018, ``Non-model-based multiple damage identification of beams by a continuously scanning laser Doppler vibrometer system", Measurement, 115: 185-196


18. K.S. Dai, Y. Wang, Y.C. Huang, W.D. Zhu, Y.F. Xu, 2017, ``Development of a modified stochastic subspace identification method for rapid structural assessment of in-service utility-scale wind turbine towers", Wind Energy, 20(10): 1687-1710


19. D.-M. Chen, Y.F. Xu, W.D. Zhu, 2017, ``Experimental investigation of notch-type damage identification with a curvature-based method by using a continuously scanning laser Doppler vibrometer system", Journal of Nondestructive Evaluation, 36(2): 38


20. Y.F. Xu, W.D. Zhu, S.A. Smith, 2017, ``Non-model-based damage identification of plates using principal, mean and Gaussian curvature mode shapes", Journal of Sound and Vibration, 400: 626-659


21. Y.F. Xu, D.-M. Chen, W.D. Zhu, 2017, ``Damage identification of beam structures using free response shapes obtained by use of a continuously scanning laser Doppler vibrometer system", Mechanical Systems and Signal Processing, 92: 226-247


22. Y.F. Xu, W.D. Zhu, 2017, ``Non-model-based damage identification of plates using measured mode shapes", Structural Health Monitoring - An International Journal, 16(1): 3-23


23. J.M. Liu, Y.F. Xu, W.D. Zhu, 2017, ``New coherence function with measurements of one sampling period", Mechanical Systems and Signal Processing, 88: 354-376


24. J. Liu, W.D. Zhu, P.G. Charalambides, Y.M. Shao, Y.F. Xu, X.M. Fang, 2016, ``A dynamic model of a cantilever beam with a closed, embedded horizontal crack including local flexibilities at crack tips", Journal of Sound and Vibration, 382: 274-290


25. D.-M. Chen, Y.F. Xu, W.D. Zhu, 2016, ``Damage identification of beams using a continuously scanning laser Doppler vibrometer system", ASME Journal of Vibration and Acoustics, 138(5): 051011 (16 pages)


26. J. Liu, W.D. Zhu, P.G. Charalambides, Y.M. Shao, Y.F. Xu, K. Wu, 2016, ``Four-beam model for vibration analysis of a cantilever beam with an embedded horizontal crack", Chinese Journal of Mechanical Engineering, 29(1): 163-179


27. Y.F. Xu, W.D. Zhu, 2016, ``Efficient and accurate calculation of discrete frequency response functions and impulse response functions", ASME Journal of Vibration and Acoustics, 138(3): 031003 (17 pages)


28. Y.F. Xu, W.D. Zhu, J.M. Liu, 2015, ``Accurate and efficient calculation of discrete correlation functions and power spectra", Journal of Sound and Vibration, 347: 246-265


29. Y.F. Xu, W.D. Zhu, J. Liu, Y.M. Shao, 2014, ``Identification of embedded horizontal cracks in beams using measured mode shapes", Journal of Sound and Vibration, 333(23): 6273-6294


30. W.D. Zhu, J.M. Liu, Y.F. Xu, H.Q. Ying, 2014, ``A modal test method using sound pressure transducers based on vibro-acoustic reciprocity", Journal of Sound and Vibration, 333(13): 2728-2742


31. Y.F. Xu, W.D. Zhu, 2013, ``Operational modal analysis of a rectangular plate using non-contact excitation and measurement", Journal of Sound and Vibration, 332(20): 4927-4939

Conference Papers and Presentations

1. W. Zhou, Y.F. Xu, ``Damage Identification for Beam-Like Structures Based on Proper Orthogonal Modes of Guided Wavefields", Proceedings of the ASME International Mechanical Engineering Congress and Exposition , Columbus, OH, Oct. 30 - Nov. 3, 2022


2. D.R. Kiracofe, U. Wani, Y. F. Xu, ``Damaged Metamaterials, Structural Health Monitoring and Damage Tolerance", Proceedings of the International Modal Analysis Conference-XL , Orlando, FL, Feb. 7-15, 2022


3. W. Zhou, Y.F. Xu, J.S. Kim, ``Structural Damage Identification for Plate-Like Structures Using Two-dimensional Teager Energy Operator-Wavelet Transform", Proceedings of the International Modal Analysis Conference-XL , Orlando, FL, Feb. 7-15, 2022


4. A. Thakur, Y.F. Xu, ``Structural Damage Identification Using Beamforming Acoustic Source Localization", Proceedings of the ASME International Mechanical Engineering Congress and Exposition , Virtual Conference, Nov. 1-4, 2021


5. J.S. Kim, Y.F. Xu, ``Photogrammetry-based experimental modal analysis for plate structures", Proceedings of the International Modal Analysis Conference-XXXVIII , Virtual Conference, FL, Feb. 10-13, 2021


6. W. Zhou, Z. Feng, Y.F. Xu, X. Wang, H. Lv, ``Empirical Fourier decomposition for time-domain signal decomposition", Proceedings of the International Modal Analysis Conference-XXXVII , Virtual Conference, Feb. 10-13, 2021


7. Y.F. Xu, J.S. Kim, ``Damage identification of beam structures using curvature waveforms of propagating flexural waves", Proceedings of the ASME International Mechanical Engineering Congress and Exposition , Virtual Conference, Nov. 16-19, 2020


8. J.S. Kim, Y.F. Xu, ``Finite Element Modeling of Structures with Solid-riveted Joints", Proceedings of the International Design Engineering Technical Conferences \& Computers and Information in Engineering Conference , Anaheim, CA, Aug. 18-21, 2019


9. Y.F. Xu, ``Photogrammetry-based Structural Damage Detection by Tracking a Laser Line", Proceedings of the International Modal Analysis Conference-XXXVII , Houston, TX, Feb. 10-13, 2020


10. Y.F. Xu, D.-M. Chen, W.D. Zhu, ``Output-only modal parameter estimation using a continuously scanning laser Doppler vibrometer system with application to structural damage detection", Proceedings of the International Modal Analysis Conference-XXXVII , Orlando, FL, Jan. 28-31, 2019


11. D.-M. Chen, Y.F. Xu, W.D. Zhu, ``Operational modal analysis and damage identification of structures undergoing random vibration using a continuously scanning laser Doppler vibrometer system", Proceedings of the ASME International Mechanical Engineering Congress and Exposition , Pittsburgh, PA, Nov. 9-15, 2018; first place in the Student Paper Competition (Best Paper) Award of the Noise Control and Acoustics Division


12. D.-M. Chen, Y.F. Xu, W.D. Zhu, ``A round Robin study: detection of damage in a composite plate with a real-time moving sensor measurement technique '', Proceedings of the International Design Engineering Technical Conferences \& Computers and Information in Engineering Conference , Quebec City, Canada, Aug. 26-29, 2018


13. D.-M. Chen, Y.F. Xu, W.D. Zhu, ``Delamination identification of laminated composite plates using a continuously scanning laser Doppler vibrometer system", Proceedings of the International Modal Analysis Conference-XXXVI , Orlando, FL, Feb. 12-15, 2018


14. D.-M. Chen, Y.F. Xu, W.D. Zhu, ``Delamination identification of laminated composite plates using a continuously scanning laser Doppler vibrometer system", Proceedings of ASME 2017 International Mechanical Engineering Congress and Exposition , Tampa, FL, Nov. 3-9, 2017


15. Y.F. Xu, D.-M. Chen, W.D. Zhu, ``Non-model-based delamination detection of composite plates using measured mode shapes", Proceedings of the ASME 2017 Dynamic Systems and Control Conference , Tysons, VA, Oct. 11-13, 2017


16. D.-M. Chen, Y.F. Xu, W.D. Zhu, ``Experimental investigation of notch-type damage identification by using a continuously scanning laser Doppler system", Proceedings of the International Modal Analysis Conference-XXXV , Garden Grove, CA, Jan. 30-Feb. 2, 2017


17. Y.F. Xu, D.-M. Chen, W.D. Zhu, ``Damage identification of beam structures using free response shapes measured by a continuously scanning laser Doppler vibrometer system", Proceedings of the International Modal Analysis Conference-XXXV , Garden Grove, CA, Jan. 30-Feb. 2, 2017


18. D.-M. Chen, Y.F. Xu, W.D. Zhu, ``Damage identification using a continuously scanning laser Doppler vibrometer system", Proceedings of the ASME 2016 International Mechanical Engineering Congress and Exposition , Phoenix, AZ, Nov. 11-17, 2016


19. K.S. Dai, Y. Wang, Y.C. Huang, W.D. Zhu, Y.F. Xu, ``Modified stochastic subspace identification method for estimating natural frequencies of in-service utility-scale wind turbine towers", Proceedings of the ASME 2016 International Mechanical Engineering Congress and Exposition , Phoenix, AZ, Nov. 11-17, 2016


20. Y.F. Xu, W.D. Zhu, ``Non-model-based damage identification of plates using curvature mode shapes", Proceedings of the International Modal Analysis Conference-XXXIV , Orlando, FL, Feb. 25-28, 2016


21. Y.F. Xu, W.D. Zhu, ``Efficient and accurate calculation of discrete frequency response functions and impulse response functions", Proceedings of the ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference , Boston, MA, Aug. 2-–5, 2015


22. S.A. Smith, W.D. Zhu, Y.F. Xu, ``Finite element modeling of a 40m space frame wind turbine tower", Proceedings of the International Modal Analysis Conference-XXXIII , Orlando, FL, Feb. 2-5, 2015


23. Y.F. Xu, W.D. Zhu, J. Liu, Y.M. Shao, ``Non-model-based crack identification using measured mode shapes", Proceedings of the International Modal Analysis Conference-XXXII , Orlando, FL, Feb. 3-6, 2014


24. W.D. Zhu, J.M. Liu, Y.F. Xu, H.Q. Ying, ``A modal test method based on vibro-acoustic reciprocity", Proceedings of the International Modal Analysis Conference-XXXI , Garden Grove, CA, Feb. 11-14, 2013


25. Y.F. Xu, W.D. Zhu, ``Operational modal analysis of a rectangular plate using acoustic excitation", Proceedings of the International Modal Analysis Conference-XXIX , Jacksonville, FL, Jan. 31-Feb. 3, 2011

Faculty

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Current Graduate Students

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Alumni

Teaching

•MECH 5072C - Experimental Methods in Mechanical Engineering

Springs of 2018,2019,2023



•MECH 5160/6060 - Applied Fast Fourier Transform

Falls of 2018,2019,2020,2021,2022



•MECH 5162C/6062C - Experimental Vibrations

Springs of 2019,2020,2021,2022,2023

Contact

Address:
University of Cincinnati
635 Rhodes Hall
Cincinnati, Ohio 45221