Sheet Structure Of The Vibration Absorber Control Study

The structures excited in practice are mostly elastic structures, and the vibration and noise of those structures are sometimes disadvantageous to working environment and product capability, so the study of control of vibration and noise for them is very meaningful. The passive dynamic vibration absorber is a kind of very effective device for suppressing vibration, which is simple in structure, easy to fit, and not consuming power. The Suppression of vibration of elastic structures using dynamic vibration absorbers is studied in this paper, for providing the theory basis and design method for the vibration-absorption control of elastic structures.A simply supported rectangular thin plate is simulated as the main vibration system in this paper. The dynamic model of the main system with multiple dynamic vibration absorbers under multiple harmonic fixed force and force-coupling is studied by means of power flow method, and in order to make the results have general meaning, the structure mobility and power flow in the system are expressed in dimensionless fashion. Based on this, regarding the maximum of the net power flow input the main vibration system over the control frequency range as the objective function, discussed is the optimal design of dynamic vibration absorbers in multiple cases. Furthermore, by analyzing the influence of interrelated factors on the structure parameters and the control effect of dynamic vibration absorbers, some conclusions are attained as follows: the influence of the exciting form and main structure form on the parameters of dynamic vibration absorbers is not apparent when the mass ratio is small; increasing the mass ratio can enhance the control effect, but it is not economical when the mass ratio is biggish; the exact loss factor of the main vibration system is not necessary in practical engineering; dynamic vibration absorbers should be fit in the positions of large response to attain good control effect.Because random vibration is widespread in practice, the suppression of random vibration of a plate using a dynamic vibration absorber is also studied in this paper. The system transfer function is deduced by means of the theories of structure mobility. And based on this, the displacement response variance is integrated in the space field to attain the evaluation index of total response, which is named as the total displacement response variance. The results of the numerical simulation demonstrate that the dynamic vibration absorber is effective in suppressing random vibration in the whole broadband frequency region when it is tuned to the first resonance and has appropriate damping coefficient.A kind of broadband uniform beam-type dynamic vibration absorber for elastic structures is brought forward for the complexity of the traditional dynamic vibration absorber. Based on the power flow characteristic of the beam-plate coupled structure,...