期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 165, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2021.108338
关键词
Strain dependence characteristics; Reduced order model; Coated blisks; Forced responses; Mistuning identification
资金
- National Natural Science Foundation of China [51775092]
- Fundamental Research Funds for the Central Universities of China [N180312012]
This paper explores the modelling methods of coated blisks and validates the linear and nonlinear ROMs through experimental tests. Additionally, it analyzes the impact of nonlinear strain dependence characteristics on the forced responses of coated blisks with different loss factor substrate.
Several papers have studied the modelling methods of coated blisks and proved the perfect damping performance of hard coatings. However, nonlinear strain dependence characteristics of the coatings have been rarely incorporated in opened studies of complicated coated blisks. In this paper, a linear reduced order model (ROM) of coated blisks is developed, where two reduction methods, Craig-Bampton (CB) method and the second modal analysis, are performed. By introducing the nonlinear strain dependence characteristics of the coatings in the linear ROM, a nonlinear ROM is presented and solved by an iteration method to obtain the forced responses of coated blisks with nonlinear strain dependence characteristics. Furthermore, the stiffness mistuning pattern and loss factor of uncoated blisks obtained by the developed experimental based identification process are introduced in the analysis model. The linear and nonlinear ROMs of coated blisks are validated by the experimental tests. Finally, the effect of nonlinear strain dependence characteristics on forced responses of coated blisks where the blisk substrate has different loss factors is analyzed.
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