Constrained damping layer structure vibration calculation method

Abstract

The invention discloses a constrained damping layer structure vibration calculation method. Through starting from a constrained damping layer damping and noise reducing mechanism, utilizing damping loss factors in statistical energy analysis to reflect damping effects of constrained damping layers, combining a modal strain energy method and considering frequency-dependent shear modulus and material loss factors of frequency of the constrained damping layers, a vibration calculation method for large-scale constrained damping layer structures is established, so that the forecast evaluation and optimized analysis of the constrained damping layers applied to large-scale structure damping and noise reducing are realized. According to the method, the calculation efficiency is remarkably improved and the vibration simulated analysis of the large-scale constrained damping layer structures can be realized; and the frequency-dependent characteristics of material shear modulus and material loss factors of the damping layers are considered so that the precision of simulated analysis is improved. By utilizing the method, optimized analysis can be carried out on laying positions and structure parameters of the constrained damping layers, the damping and noise reducing effects of the constrained damping layers can be forecasted, and the constrained damping layers can be utilized to carry out vibration and noise control on engineering structures.

Description

technical field [0001] The invention belongs to the technical field of structural vibration control, and specifically relates to a new method for calculating structural vibration of constrained damping layers based on modal strain energy and statistical energy analysis principles, which can be applied to steel bridges or steel-concrete combined beam bridges for constrained damping layers. Theoretical calculation and optimal design of vibration and noise control of large structures. Background technique [0002] Engineering structures vibrate under dynamic loads (wind, vehicles, pedestrians, etc.). Excessive vibration will not only affect the normal use of the structure, but also cause vibration and noise pollution to the surrounding environment. Under the same dynamic load, the vibration and noise generated by the steel structure are often 10-20dB higher than that of the concrete structure, which greatly limits the application of steel structures in practical engineering, e...

AI Technical Summary

Problems solved by technology

The existing constrained damping layer calculation methods mostly only care about the first few modal loss factors of the structure, and cannot reflect the vibration and noise changes of the structure in the main frequency range

The actual engineering structure is large in scale, complex in structure, dense in modes, and has a wide range of vibration and noise frequencies. It is often difficult to calculate and analyze large constrained damping layer structures using existing methods.

Images