Pressure Pulsation Attenuator Mathematic Simulation And CFD Flow Resolution

With the demand of miniaturization and portability, hydraulic system must be developed to the trend of higher pressure. However, the vibration noise of high-pressure system restrains the application of the system seriously. Hence, to decrease the vibration noise of pump, not only improvement of pump construction, but also plenty of fixed miniature attenuator on the high-pressure outlet are used to restrain the affect of flow fluctuation to the system.This thesis overviews the development-history and research-circumstance of hydraulic-attenuation and fluctuation-damping devices, and summarizes the emphases on the devoted study of this thesis. The general model applied for all kinds of attenuator is derived using the method of lumped parameter. Moreover, on the base of the method of distributed parameter, the transfer function of attenuator-system is built by means of network analysis methods. So the resistances and the transfer functions about pressures at any point of the system can be obtained. The relations between the resistances and transfer functions are analyzed, and the main factors, which affect the performance of the system, are also analyzed.Firstly, by the analysis of vibration damping principles about attenuator system, a new experimental way of attenuator is presented. Then, using the software of STAR-CD fluid, the models and analyses of the attenuator are carried out. By the transient analysis using CFD technology, the velocity distribution and pressure distribution can be obtained, which offers the theory foundation for designing rational attenuator.Through the simulation of attenuator mathematics model and CFD fluid resolution, it proves that the attenuator, as a new type of hydraulic vibration damping device, has a good prospect for industrial applications.