Impact Series Shaker Excitation Approach for Structural Modal Testing in Thermal Environments
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Thermal modal testing plays an important role in the aerospace engineering. However, excitation approaches applied in tests at room temperature do not work well in thermal environments. This paper, to solve this problem, introduces the impact series excitation approach to excite the structures by the modal shaker. Two excitation configurations are presented for the tests under different temperature conditions. Compared with the conventional shaker excitation, this approach shows apparent advantages thanks to the avoidance of mechanical connection between the shaker and the test article. As both excitation configurations can yield high-quality test results in different temperature environments, the proposed approach is validated to be effective and convenient to modal testing.
KeywordsExcitation technique Thermal modal testing High-temperature environment Composite structure Impact series
This work is supported by the National Natural Science Foundation of China (Grant No. 11372084). This support is gratefully acknowledged.
- 2.Vosteen LF, Mcwithey RR, Thomson RG (1957) Effect of transient heating on vibration frequencies of some simple wing structures. NACA-TN-4054. https://ntrs.nasa.gov/search.jsp?R=19930084882
- 3.Glass DE (2008) Ceramic Matrix Composite (CMC) Thermal Protection Systems (TPS) and Hot Structures for Hypersonic Vehicles. Paper presented at the 15th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, Dayton, Ohio. https://doi.org/10.2514/6.2008-2682
- 6.Zhao R, Yu K, Cui N (2018) Vibration response analysis of a composite sandwich plate under a time-varying thermal environment. J Vib Eng 31(2):329–335. https://doi.org/10.16385/j.cnki.issn.1004-4523.2018.02.017 (in Chinese)Google Scholar
- 7.Zhao R, Yu K, Hulbert GM, Wu Y, Li X (2017) Piecewise shear deformation theory and finite element formulation for vibration analysis of laminated composite and sandwich plates in thermal environments. Compos Struct 160:1060–1083. https://doi.org/10.1016/j.compstruct.2016.10.103 CrossRefGoogle Scholar
- 13.Bai Y, Yu K, Zhao R, Zhao J, Zhou H, Yang Y, Ma Y (2018) Experimental investigation on the effects of the high temperature and debonding on the modal characteristics of a composite honeycomb structure. Acta Mat Compos Sin 35(4):40–50. https://doi.org/10.13801/j.cnki.fhclxb.20170628.002 (in Chinese)Google Scholar
- 18.Spivey ND (2010) High-temperature modal survey of a hot-structure control surface. Paper presented at the 27th Congress of International Council of the Aeronautical Sciences, Nice, FranceGoogle Scholar
- 21.Cloutier D, Avitabile P, Bono R, Peres M (2009) Shaker/stinger effects on measured frequency response functions. Paper presented at the Proceedings of the IMAC-XXVII, OrlandoGoogle Scholar
- 22.Warren C, Avitabile P (2011) Effects of Shaker Test Set Up on Measured Natural Frequencies and Mode Shapes the 28th International Modal Analysis Conference, IMAC-XXVIII. Springer New York, Jacksonville, pp: 1245–1250.Google Scholar
- 24.Sharma A, Brown DL, Allemang RJ, Phillips AW (2016) An alternative MIMO FRF estimation method using pneumatic exciters. In: Mains M (ed) Topics in modal analysis & testing, vol 10. Springer, Heidelberg, pp 361–379Google Scholar