Bump-Type Foil Bearing Structural Stiffness: Experiments and Predictions

Abstract

Bearing Nominal Dimensions) 30 Predicted Structural Stiffness of a Single Bump for Different Dry Friction Coefficients. Foil Bearing Nominal Dimensions 31 Predicted Structural Stiffness of a Single Bump for a ± 30% Range of the Nominal Bump Height. (µ f = 0.1; Foil Bearing Nominal Dimensions) 32 Predicted Structural Stiffness of a Single Bump for a ± 10% Range of the Nominal Half Bump Length. (µ f = 0.1; Foil Bearing Nominal Dimensions) 33 Coordinate Systems in the CFB for the Structural Stiffness Analysis 34 Predicted and Experimental Load versus Bearing Deflection Curves for Position 1-5 (0º-180º). (Shaft Diameter D 1 = 1.500 in; µ f = 0.1; lo = 0.08 in) 35 Predicted and Experimental Load versus Bearing Deflection Curves for Position 1-5 (0º-180º). (Shaft Diameter D 1 = 1.500 in; µ f = 0.1; lo = 0.085 in) 36 Predicted and Experimental Load versus Bearing Deflection Curves for Position 1-5 (0º-180º). (Shaft Diameter D 1 = 1.500 in; µ f = 0.1; lo = 0.07 in) 37 Predicted Load versus Bearing Deflection Curves for Different Values of Dry Friction Coefficients. (Positions 1-5; Shaft Diameter D1; lo = 0.08 in) 38 Predicted and Experimental Structural Stiffness versus the Shaft Deflection (Shaft Diameter D 1 =1.500in; µ f = 0.1; lo = 0.085 in; r = 0 in) 39 Predicted and Experimental Structural Stiffness versus the Shaft Deflection (Shaft Diameter D 2 =1.501 in; µ f = 0.1; lo = 0.085 in; r = 0.5 mil) 40 Predicted and Experimental Structural Stiffness versus the Shaft Deflection (Shaft Diameter D 3 =1.499 in; µ f = 0.1; lo = 0.085 in; r =-0.5 mil) 41 Predicted and Experimental Structural Stiffness with respect to the Static Load.

Numerical and experimental investigation of bump foil mechanical behaviour

“…Similar experiments were performed by Rubio and San Andres [9,10]. These authors compared the experimental results to the ones obtained using a simplified mathematical model, in which the bump foil contribution was represented by simple elastic springs.…”

“…Zywica [19,20] simulated the top foil structure using commercial FE programs and compared to results previously published in [10]. This structural model was applied in a complex model [21] taking into account the fluid film pressure by solving the Reynolds equation.…”

Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander

“…Among them, bump type foil bearing attracted considerable attention [10]. Besides, metal mesh [11] and viscoelastic [12,13] configurations and so on have been presented.…”

Gas Foil Bearing Analysis and the Effect of Bump Foil Thickness on its Performance Characteristics Using a Non-Linear Matrix Equation Solver

“…Through an optical track system, bump deflection images are captured indicating that the horizontal deflection of the segment between bumps is negligible compared to the transversal deflection of the bumps. Rubio and San Andrés [9] also presented an experimental and analytical procedure aimed to identify the structural stiffness for an entire bump-type foil bearing. Ruscitto et al [10] performed a series of load capacity tests of bump type GFBs.…”