Abstract
This paper focuses on the contact characteristics of the blade root joints subjected to the dry friction damping under periodic excitation. The numerical method and experimental procedure are combined to trace the contact behavior in the nonlinear vibration conditions. In experimental procedure, a novel excitation method alongside the accurate measurements is used to determine the frequencies of the blade under different axial loads. In numerical simulations, local behavior of contact areas is investigated using the reduction method as a reliable and fast solver. Subsequently, by using both experimental measurements and numerical outcomes in a developed code, the global stiffness matrix is calculated. This leads to find the normal and tangential stiffness in the contact areas of a dovetail blade root joints. The results indicate that the proposed method can provide an accurate quantitative assessment for investigation the dynamic response of the joints with focusing the contact areas.
Highlights
Complex mechanical structures usually include several subassemblies, which may have contact surfaces in common
This paper focuses on the contact characteristics of the blade root joints subjected to the dry friction damping under periodic excitation
A novel excitation method alongside the accurate measurements is used to determine the frequencies of the blade under different axial loads
Summary
Complex mechanical structures usually include several subassemblies, which may have contact surfaces in common. A Parks–McClellan Finite Impulse Response (FIR filter wAifttheraorbiptpailne ionfg1·t1h0e–4v0edloBciintythseigpnaaslsbvantd afnodr eaarciphpaleppofli−e4d0dteBnisnilethfeorrecme,aiitniins ftroeqrueaenliczyebtahneddwepasenaddoepntceedo(sfeneoFnigliunreea7r).modal parameters, i.e., natural frequency damping η from the vibration amplitude To this purpose, the free decay of the e velocity signal v t from the excitation starting points until the detachment of th tip should be analyzed. The stiffening phenomenon (increase in frequency) is observed for further larger values of vibration amplitude, which can be attributed to the variation of normal force at the contact region caused by the bending of the blade simulacrum. Ratnhgeeof amxiaol trdacetilon fDorcOes Fin wihnich ccoommpletme adehrecsiioan lof tfhienite
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