Design And Performance Analysis Of The Damping Structure Of Pipeline Coated By Metal Rubber At High Temperature

Naval vessel is one of the most important weapon equipments in national defense,and its vibration of pipeline system will directly affect its service performance.The application environments of weapons and equipments are complex and diverse,and there are often harsh environments such as high and low temperatures,corrosion,irradiation,etc.In these environments,the demand for vibration reduction is stringent.Traditional polymer-based rubber is usually used as the vibration-absorbing material,but the vibration-reducing performance of rubber in complex environments is seriously limited.Based on this,the vibration-reducing problem of pipeline system at high temperature is highlighted.In this study,metal rubber instead of rubber is used as damping material,which can make up for the defects of rubber in complex environments.In this work,the problem of vibration reduction of pipeline system at high temperature in narrow space is studied in depth.The coated damping structure of pipeline as requested is designed,as well as the preparation of the sheet metal rubber for coating.The experimental test system is designed and the experimental study of the coated damping structure is carried out.The characterization of energy dissipation characteristics is proposed,and the energy dissipation factor and energy dissipation are used to characterize the energy dissipation characteristics of the coated damping structure.The effects of main parameters such as temperature,amplitude,frequency and density of metal rubber on the energy dissipation characteristics of the coated damping structure are analyzed.In this present study,based on the serviced environment of pipeline in practical engineering application,the physical model of pipeline coated damping system supported by two points is simplified.Based on impulse response matrix,the support structure and pipeline are described.At the same time,the corresponding dynamic analysis is performed.The model and dynamic equations of coated pipeline system at high temperature are established,and its dynamic characteristics are analyzed.It provides a reliable basis for the analysis of similar structures such as non-linear coated pipeline damping structure.The experiment of vibration reduction performance of pipeline coated damping structure is performed,and the experimental set-up is built.The coated damping structure is applied to pipeline coated system.The variable stiffness and damping performance of metal rubber are deduced theoretically,and the temperature dependence of metal rubber is studied by experiments.The influences(temperature,magnitude of excitation,density of metal rubber,number of cladding layers and installation pre-tightening)on the vibration absorption performance of metal rubber are studied.Based on the experimental test of the coated damping structure,the model of pipeline coated damping structure is established based on the exact decomposition method of hysteresis loop.The model parameters are identified by the method of parameter identification in time domain.The parameters such as nonlinear elastic restoring force coefficient,damping coefficient and damping component factor are obtained.Finally,the constitutive relationship of the coated damping structure is obtained.Compared with the test data,the rationality and accuracy of the model are verified,which provides a theory and experimental basis for the study of pipeline vibration reduction.