Research On Influencing Factors And Their Interaction Regulations Of Equivalent Damping Of Multilayer Bellows

Multilayer bellows has greater bit shift compensation capacity, vibration and noise reduction capacity. Multilayer bellows will have a perfect damping characteristic when appropriate metal and viscoelastic damping materials are adopted to process the metal multilayer and sandwich damping layer, thus attaining the purpose of vibration and noise reduction.This paper took multilayer bellows with sandwich damping as the research object, the influencing factors and their interaction regulations of equivalent damping of the multilayer bellows were researched by theoretical analysis, numerical simulation and experimental testing. Loss factor is one of main indices to measure the energy of vibration which damping material dissipates. The damping energy is more bigger,the loss factor is more bigger. Finite element model of multilayer bellows with sandwich damping was built by ANSYS finite element analysis software. This paper presented that the loss factor of multilayer bellows was solved by modal strain energy iterative method which was compiled by APDL programming language. In this paper, the influence and interaction regulations of the property of vescoelasic damping, the geometric parameter and configuration of multilayer bellows on the loss factor of the multilayer bellows were discussed and analyzed.The analyzed results showed that:the loss factor of multilayer bellows would increase firstly, and decrease gradually with increasing of the elastic modulus of viscoelastic damping wave height,it would decrease firstly, and increase gradually with increasing of the thickness of viscoelastic damping material, but the density of viscoelastic damping material had no influence on the loss factor. When other parameters were constant, the loss factor of multilayer bellows would increase with increasing wave height, wave number and number of layers of multilayer bellows, it would decrease firstly, and increase gradually with increasing of wall thickness, it also would decrease with increasing pitch of wave and diameter. In order to make the multilayer bellows have perfect vibration and noise reduction capacity, the property of the viscoelastic damping, the geometric parameter and configuration of multilayer bellows should be combined.The multilayer bellows was carried on experimental modal analysis, the loss factor of multilayer bellows was solved by parametric recognition. The test result compared with the simulation result, the error was only 6.25%. It verified that the simulation results were accuracy and the method which the loss factor of multilayer bellows were solved by modal strain energy iteration method was feasible.This paper provided definite reference for researching the best way of damping treatment of multilayer bellows with sandwich damping and provided definite reference price of the multilayer bellows with sandwich damping's design, manufacture and applications, it also was of far reaching importance for enhancing vibration and noise reduction capacity of our country's multilayer bellows.