Research of resonators based on elastic sheet/membrane elements for hydraulic system

• A class of resonators based on sheet/membrane elements is proposed.
• Attenuation characteristics of resonators are studied.
• Mathematical model of system is established by adopting frequency method.
• Results of simulation and experiment show good performance.

Based on the theory of dynamic vibration absorber, a class of structure resonators equipped with additional vibrators is put forward to suppress fluid pulsation which causes system unstable or reduces work performance. Working principle of resonators is explained from mechanics and three kinds of elements are used to work as additional vibrators, namely round metal sheet, rectangular metal sheet, round rubber membrane. Multiple vibrators are designed into one resonator to damp the pressure pulsation in system over a wide range of frequency. Mathematical models of resonators based on sheet elements are gained through analyzing the vibration characteristics of sheets in fluid. Lumped parameter method is used to study the attenuation characteristics which are based on matrix model of the entire hydraulic system. Simulations are conducted and results guide the determination of configuration parameters of experimental prototypes. Experimental tests are carried out on prototypes and results show good attenuation performance, especially near the resonant frequencies of sheet/membrane elements in fluid.