Experimental Study on the Influence on Vibration Characteristics of Thin Cylindrical Shell with Hard Coating under Cantilever Boundary Condition

Abstract

This research has experimentally investigated the influence on vibration characteristics of thin cantilever cylindrical shell (TCS) with hard coating under cantilever boundary condition. Firstly, the theoretical model of TCS with hard coating is established to calculate its natural frequencies and modal shapes so as to roughly understand vibration characteristic of TCS when it is coated with hard coating material. Then, by considering its nonlinear stiffness and damping influences, an experiment system is established to accurately measure vibration parameters of the shell, and the corresponding test methods and identification techniques are also proposed. Finally, based on the measured data, the influences on natural frequencies, modal shapes, damping ratios, and vibration responses of TCS with hard coating are analyzed and discussed in detail. It can be found that hard coating can play an important role in vibration reduction of TCS, and for the most modes of TCS, hard coating will result in the decrease of natural frequencies, but the decreased level is not very big, and its damping effects on the higher frequency range of the shell are weak and ineffective. Therefore, in order to make better use of this coating material, we must carefully choose the concerned antivibration frequency range of the shell; otherwise it may lead to some negative effects.

Free vibration analysis of rotating thin-walled cylindrical shells with hard coating based on Rayleigh-Ritz method

“…In addition, circumferential variable stiffness springs were proposed to simulate actual elastic constraints. Li et al 16 built an experiment system to analyze the vibration behaviors of hard-coating cantilever cylindrical shells and presented the identification techniques of vibration parameters. Based on the classical laminated shell theory and Rayleigh-Ritz method, Li et al 17 established a theoretical model to investigate the effect of hard coating on the vibration behaviors of the non-rotating fiber-reinforced composite thin shell.…”

“…Li et al. 16 built an experiment system to analyze the vibration behaviors of hard-coating cantilever cylindrical shells and presented the identification techniques of vibration parameters. Based on the classical laminated shell theory and Rayleigh-Ritz method, Li et al.…”

Passive Vibration Reduction Analysis of the Mistuned Blisk Deposited Hard Coating Using Modified Reduced-Order Model

“…In recent years, the significant mechanical damping capacities of hard coating generated by the friction energy dissipation of internal particles of coating materials [22] have been found by a number of researchers. Subsequently, hard coating was used widely as the vibration dampers to reduce the resonant stress of vibrating structures for its nicer stability and high damping capacities in high temperature [23], such as the titanium plates [24][25][26][27], the cantilever beams [28,29], the cylindrical thin shells [30][31][32] and the individual blades [33][34][35], etc. Moreover, another great advantage of hard coating was that the resonant peaks of the forced response of vibrating structures can be suppressed remarkably without influencing the structural mass and stiffness significantly because of its thin thickness.…”

Identification of the Anisotropic Elastic Parameters of NiCrAlY Coating by Combining Nanoindentation and Finite Element Method

“…In recent years, hard coatings applied as functional coatings on thin plate have shown significant damping effects [1,2] and are being widely studied as a new type of passive damping method. In the hard coating damping system, the elastic modulus of the hard coating directly affects the stiffness and the damping effect of the coating structure.…”