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Health Monitoring using the Frequency Response under Compressive Load
Objectives: This paper presents a health monitoring criteria development aspect based on the frequency response spectrum under axial compressive load on wooden samples. Methods/Statistical Analysis: The compression tests are performed on different wooden specimens as per IS:1708 (Part VIII and IX):1986. The impact echo test is conducted at certain load intervals under increased compressive load and the frequency spectrum was monitored. A MATLAB based code is used to calculate the dominant frequency values of the sound signals corresponding to each impact echo test. The graphs for frequency and compressive load are plotted for different samples. Findings: Interesting conclusions were obtained from the frequency plots under compressive load before failure and after failure. It was observed that loading decreases the frequency values. But at the point of initial major crack, frequency was increased due to length reduction. Applications/Improvements: A health monitoring criteria can be developed based on the frequency response trends by observing these increased value of frequency when tested on the wooden samples. The damaged and undamaged state were predicted successfully.
Compressive Load, Frequency Response Spectrum, Health Monitoring, Impact Echo Test, MATLAB.
- Gustafsson A, Pousette A. Health monitoring of timber bridges. International Conference on Timber Bridges (ITCB); 2010. p. 1–10.
- Sergio J, Sanabria S, Neuenschwander J, Niemz P, Sennhauser U. Structural health monitoring of glued laminated timber with a novel air-coupled ultrasound method. World Conference on Timber Engineering (WCTE); 2010. p. 1–10.
- Phares BM, Wipf TJ, Deza U, Wacker JP. Development of a smart timber bridge-a five-year plan. General Technical Report FPL-GTR-195. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory; 2011. p. 10.
- Bucur V. Delamination detection in wood-based composites - a methodological review. Proceedings of 20th International Congress on Acoustics, Sydney, Australia; 2010. p. 1–8.
- Fan W, Qiao P. Vibration-based damage identification methods: a review and comparative study. Structural Health Monitoring. 2010 Feb; 10(1):83–29.
- Nagatha S, Miyagawa Y, Kanazawa K. Reduction of natural frequency due to flexural cracks or shear cracks in reinforced concrete members. 15th World Conference on Earthquake Engineering (WCEE), Japan; 2012. p. 1–8.
- Hamad WI, Owen JS, Hussein MFM. Modeling the degradation of vibration characteristics of reinforced concrete beams due to flexural damage. Structural Control and Health Monitoring. 2015 Jun; 22(6):939–67,
- Sudhir K, Jain J, Murty CVR, Kamle S. Experimental study on natural frequency of prestressed concrete beams. 1997; 19(9):718–23.
- Kopac J, Sali S. The frequency response of differently machined wooden boards. Journal of Sound and Vibration. 1999; 227(2):259–69.
- Chung K, Cheung C, RaJik Y, Itani I, Polensek A. Characteristics of wood diaphragms: experimental and parametric studies. Wood and Fibre Science. 1988; 20(4):438–56.
- Arora SS. Study of vibration characteristics of cantilever beams of different materials. M. Tech Thesis, Department of Mechanical Engineering, Thapar University, Patiala; 2012 Jul. p. 1–104.
- Liu PL, Yeh PL. Imaging of internal cracks in concrete structures using the volume rendering technique. 17th World Conference on Non-destructive Testing; 2008 Oct. p. 1–8.
- Sharma SK, Shukla SR, Sujatha M, Shashikala S, Kumar P. IS 1708 (Part 8 and 9) Indian standard methods of testing of small clear specimens of timber, New Delhi. 1986; 9(2):165–9.
- Kumar Y. Damage detection of retrofitted beam using frequency response function. M. Tech Thesis, Department of Civil Engineering, Thapar University, Patial; 2011 Jul. p. 1–43.
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