Development research of reflection-absorption compound type fluid pulsation attenuator
Based on the disadvantages analysis of the existing fluid pulsation attenuator, two reflection-absorption compound type of fluid pulsation attenuators which are both composed of a chamber and a mass-spring-damping system are developed: in-line reflection-absorption compound type of fluid pulsation attenuators (in-line RAFPA) and side-branch reflection-absorption compound type of fluid pulsation attenuators (side-branch RAFPA). The transfer matrix models of the two attenuators are established as well as expansion chamber attenuator and Helmholtz resonator. Based on the transfer matrix model, the transmission loss of the four attenuators is given out to evaluate their attenuation characteristic. The attenuation characteristic comparisons of in-line RAFPA with expansion chamber attenuator and side-branch RAFPA with Helmholtz resonator are carried out respectively. And the effect of the mass-spring-damping system to in-line RAFPA and side-branch RAFPA is investigated. The simulation reveals the two reflection-absorption compound type of fluid pulsation attenuators have better attenuation characteristic and are more compact than expansion chamber attenuator and Helmholtz resonator.
Investigation of the pulsation-reduction characteristics of an expansion chamber attenuator in a hydraulic system
This paper investigates the expansion chamber attenuator utilized in marine hydraulic systems to determine the pulsation-reduction characteristics in hydraulic deck machinery applications. First, the background is briefly introduced. Next, the advantages and disadvantages of investigation methods borrowed from the aerodynamic field are discussed with regard to hydraulic use. Insertion loss is eventually selected to evaluate the performance of the attenuator. Finally, attenuator prototypes and a test rig that simulates an actual marine hydraulic system in a vessel are manufactured, and the experimental conditions are introduced in detail to calculate and measure the insertion loss. As indicated by the investigation conclusion, mathematic computation generally fits the test results. A better choice of length–diameter ratio ranges and other characteristics are discussed. This paper provides theoretical and experimental evidence regarding design expansion chamber attenuator use in hydraulic systems.
Energy
Energy is often defined as the ability to do work. There are many forms of energy. A few examples include; Gravitational energy, Kinetic energy (energy of motion), Thermal energy (heat energy), Potential energy. Potential energy is the energy something has based on its position in the universe. A stretched elastic band has potential energy. A rock held up in the air has potential energy based on its position.