The Research On Vibration Energy Dissipation Properties Of The Novelty Viscoelastic Damping Material Cored Composite Laminate

The research on noise and vibration goes deeper and deeper with the development of techniques such as mechanical equipment,transportation vehicles and ultra-precision laboratory,where the reduction of vibration and noise is a hot spot that is focused on by many researchers.The project is based on the viscoelastic damping material composite laminate,explored it’s vibration abatement and noise reduction mechanism,the application and configuration of the periodical perforated composite laminated,the application in noise and vibration dissipation of the viscoelastic damping material composite laminate structure with heavy density material fillers and it’s coupled structures.Considering the limitation of the existing research on the viscoelastic damping material composite structures,the project taking account the frequency-and temperature-dependent properties of the viscoelastic damping material,based on the asymptotic theory,proposed the inversion asymptotic second-order expansion method.The structural loss factor of the composite laminate can be obtained quickly and exactly,and meanwhile,the computational efficiency is improved significantly.In order to validate the calculation accuracy of the inversion asymptotic second-order expansion method,the experiment and other calculation theories methods are applied,such as the Galerkin method and finite element method.Through the analysis and comparing,it is found that the calculation efficiency and accuracy of the research method prosed in the project is better than the traditional research method,such as the finite element method and Galerkin method,when the temperature-and frequency-dependent properties of the viscoelastic damping material is considered in the energy dissipation characteristic examine of composite structures.Meanwhile,comparing to the results obtained by Galerkin method and finite element method,the results obtained by the new method closer to the experiment value according to the mathematical statistical analysis on all the results.In the process of viscoelastic damping material composite structures designing and optimizing,the periodical perforated composite laminate is constructed based on the energy dissipation mechanism of the shear deformation in the viscoelastic damping material,and the structure can provide relative large structural loss factor in middle-and high-frequency,especially in 250～1000 Hz,and the structural loss factor is 3～5 times larger than the traditional viscoelastic damping material composite structure;Based on the locally resonant theory and mass-damping weighting effect,the project prosed the large density filled composite laminate,and the structure can obtain relative large structural loss factor in low-frequency zone,especially in 1～200 Hz,and the structural loss factor are 2-3 times larger than traditional composite structures;Fundamental on the former two research objects and results,the coupled viscoelastic damping material composite laminate is established,which can generate relative large structural loss factor in the considered frequency and temperature in the project.Therefore,the inversion asymptotic second-expansion method proposed in the project can be applied to research the noise reduction and vibration abatement properties of the viscoelastic damping material based composite structure in frequency zone and temperature zone,and meanwhile,the design and optimization of the viscoelastic damping material composite laminate can be performed to determine its working frequency range and temperature zone based the calculation method.The new composite structures proposed in the project can be applied in the engineering to abatement the vibration and noised in a wide frequency and temperature zone.