Abstract
Noise in hydraulic power steering systems is mainly generated by the hydraulic pump due
to the cyclic pumping mechanism that creates pulsating flow transmitted by the fluid. This
flow ripple and pressure ripple, propagating through the hydraulic circuit, interacts in a
complex way with the other parts of the vehicle, generating audible noise inside the vehicle.
The present work shows two ways to reduce the flow ripple amplitude generated by a vane
pump through the redesigning of the pump rotating group. First, a nine-vane rotor pump is
proposed and, secondly, a pump with three discharge ports is proposed. To check their
results, a MatLab/Simulink based pump model was created according to the new
geometrical characteristics and the results are compared with the regular pump ones. Also,
a flow ripple experimental test was run using the Secondary Source Method to validate the
numerical model results of the regular pump. The new designs simulation results show
large flow ripple amplitude reduction (from 6dB to 16dB per harmonic) as well as
frequency displacement in the discharge flow ripple spectra in both designs. Also, the
simulations show perpendicular force on the pump shaft generated by the non-balanced
conditions created by the new designs.
| Original language | English |
|---|---|
| Pages | 187-200 |
| Number of pages | 14 |
| Publication status | Published - 15 Sept 2010 |
| Event | Fluid Power and Motion Control 2010 - Bath Duration: 15 Sept 2010 → 17 Sept 2010 |
Conference
| Conference | Fluid Power and Motion Control 2010 |
|---|---|
| City | Bath |
| Period | 15/09/10 → 17/09/10 |