Study On Pulse Absorption Of Bi- Onic Hydraulic Pipeline Inner Wall Nanomaterials

Hydraulic transmission system of"high-speed and high-pressure"is one of the development trends in the future."High-speed and high-pressure"not only improves the power-weight ratio of the hydraulic transmission system,but also intensifies the vibration of the plumbing of the hydraulic system,which puts forward more stringent requirements for the vibration control of the hydraulic system.Plunger pump is an important component in the hydraulic system.Most of the flow pulsation and mechanical vibration generated by its operation are transmitted to the system through hydraulic pipelines.Therefore,it has become an important research direction of vibration control of hydraulic pipeline to suppress pipeline vibration by absorbing the flow pulsation at the pump outlet.In this paper,a bionic hydraulic pipeline was invented by referring to the biological mechanism of"animal heart outlet blood vessel can withstand high-frequency and high-pressure blood pulsation".The fluid-structure interaction vibration 14-equation model of bionic hydraulic pipeline was constructed,and the friction coupling effect was considered for the first time.In addition,the effects of parameters setting including different elastic layer material,different elastic layer thickness and different pipeline length on flow fluctuation and pipeline vibration at the outlet of plunger pump were compared.The main research work and contents are as follows:?1?On the basis of the traditional fluid-structure interaction vibration 14-equation of hydraulic pipeline and the elastic material constitutive model,a bionic fluid-structure in-teraction vibration 14-equation model of hydraulic pipeline was established.Also,the friction coupling was considered for the first time,which layed a theoretical foundation for subsequent numerical analysis.?2?Single-walled carbon nanotubes?SWCNTs?were modified by non-covalent bond modification,and dispersed in room temperature vulcanized?RTV?so as to prepare RTV-SWCNTs composite specimens with different carbon nanotube content.The specimens were tested by tensile test and SEM.It was found that when the content of SWCNTs was 0.5 vol%,the dispersion of SWCNTs is the best and the mechanical properties of RTV-SWCNTs composites were the best.The composite parameters C₁₀ and C₀₁ were obtained,which laid a parameter basis for the follow-up work.?3?The bionic fluid-structure interaction vibration 14-equation model of hydraulic pipeline was modal analyzed by the transfer matrix method.Then the influence of friction term on frequency domain of bionic hydraulic pipeline was studied.Finally,the correctness of the model was verified by hammering modal experiment.?4?Considering the effect of friction coupling,the bidirectional fluid-structure in-teraction analysis of bionic hydraulic pipeline was carried out with software of ANSYS Workbench.In addition,the effects of parameters concluded in the bionic hydraulic pipe-line on flow fluctuation and pipeline vibration at the outlet of plunger pump were studied.These parameters includded different elastic layer material,elastic layer thickness and pipeline length.?5?Moreover,the bionic hydraulic pipelines with 0 vol%and 0.5 vol%SWCNTs were prepared to further study effects of various bionic hydraulic pipeline which had different elastic layer material,elastic layer thickness and pipeline length on flow fluctuation and pipeline vibration at the outlet of plunger pump.