A hybrid numerical-experimental integrated approach is presented to obtain accurate predictions of the noise field emitted by an 8.5 cc/rev external gear pump. Vibration measurements provided FFT (Fast Fourier Transform) acceleration spectra (B&K Pulse system) in a few specific positions of the external gear pump casing for some working conditions. Structural harmonic analyses were performed in order to estimate the dynamic response of the finite element model. The noise field radiated by the gear pump was computed by means of finite element vibroacoustic simulations involving the structural dynamic response as excitation boundary condition. Acoustic numerical methods were investigated in the new commercial software Simcenter 3D, such as the classical FEM (Finite Element Method and the integrated fluid-structure coupling approach. Sound power calculations based on sound intensity measurements, as well as sound pressure measurements around the pump casing were performed for validation purposes. The comparisons between numerical and experimental results aimed at confirming the proposed hybrid approach to offer a good compromise between noise prediction accuracy and reduction of experimental modeling requirements. The accuracy and the efficiency of the aforementioned numerical methods are also assessed.
Efficient Finite Element Simulations to Compute Gear Pump Noise from Vibrational Experimental Measurements
G Miccoli;
2019
Abstract
A hybrid numerical-experimental integrated approach is presented to obtain accurate predictions of the noise field emitted by an 8.5 cc/rev external gear pump. Vibration measurements provided FFT (Fast Fourier Transform) acceleration spectra (B&K Pulse system) in a few specific positions of the external gear pump casing for some working conditions. Structural harmonic analyses were performed in order to estimate the dynamic response of the finite element model. The noise field radiated by the gear pump was computed by means of finite element vibroacoustic simulations involving the structural dynamic response as excitation boundary condition. Acoustic numerical methods were investigated in the new commercial software Simcenter 3D, such as the classical FEM (Finite Element Method and the integrated fluid-structure coupling approach. Sound power calculations based on sound intensity measurements, as well as sound pressure measurements around the pump casing were performed for validation purposes. The comparisons between numerical and experimental results aimed at confirming the proposed hybrid approach to offer a good compromise between noise prediction accuracy and reduction of experimental modeling requirements. The accuracy and the efficiency of the aforementioned numerical methods are also assessed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
