Study Of TMDI In Aeolian Vibration Control Of Transmission Line

Transmission line is an important carrier of electric energy transmission and one of the main stress components in the process of energy transmission.The structural safety of transmission line is the key factor to ensure the stability of energy transmission.But the Aeolian vibration will lead to the transmission line broken,hanging metal wear and other accidents.Therefore,it is urgent to take effective anti-vibration measures to control the Aeolian vibration.It is of practical research value to use damper and other antivibration devices to control the Aeolian vibration of transmission lines.At present common structural damper mainly based on the theory of symmetric and asymmetric design,especially the damper hanging cumbersome in the transmission lines on the road,will cause the worn hanging on the transmission line and then developed into the break,based on the theory of the tuned mass damper inerter(TMDI)study also is little.Based on the theory of TMDI and the energy dissipation theory of damper,the governing equations of TMDI and damper are established respectively,and a new type of antivibration device is proposed.By means of vibration excitation test,numerical simulation and theoretical analysis,the broadband characteristics,inertial capacity amplification characteristics and energy dissipation control performance of the new vibration absorber in Aeolian vibration are systematically studied,mainly including the following aspects:(1)A new device,Tuned Mass Damper Inerter(TMDI),has been found on the basis of the traditional vibration damping device tuned mass damper(TMD)and an Inerter.The model analysis and parameter optimization of TMD are studied.Two kinds of parameter optimization research are mainly carried out.The first kind is to obtain the optimal damping and stiffness of the TMDI system by using the two fixed points of the amplitude equation curve and making the two fixed points’ amplitudes equal and the two fixed points’ amplitudes as the maximum value.The second type is to solve the variance value of the amplitude equation curve.When the variance value is the smallest,the corresponding damping value and stiffness value of the TMDI system are the optimal values at this time.In addition,the Runge-Kutta method was used to solve 20 numerical examples,and the validity of the two kinds of parameter optimization methods were verified and compared.The results show that the parameter optimization method of the variance method is in good agreement with the results of the calculation example,while the parameter optimization method of the fixed-point method is not in good agreement with the results of the calculation example.The reason is that the amplitude of the two fixed points is the maximum,and the amplitude of the two fixed points cannot be guaranteed to be the minimum value of the system.(2)According to the theory of TMDI and mechanical transmission,a kind of rack and pinion habitual vessel was designed and manufactured.The excitation test and inertial mass amplification characteristics were studied.Two kinds of excitation tests are carried out.The first one is to analyze the change of inertia mass of the inertial vessel under different excitation by changing the external excitation frequency and keeping the inertial mass of the inertial vessel unchanged.The second is to change the inertial mass of the inertial vessel under different masses by changing the mass of the inertial vessel with fixed external excitation frequency unchanged.In addition,the inertial mass value produced by the test is compared with the theoretical value of mechanical transmission.The results show that the inertial mass of the inertial vessels with the same mass is roughly the same under different excitation,and the inertial mass of the inertial vessels with different masses is in good agreement with the calculation results of mechanical transmission theory.(3)Combined with the structural characteristics of the inertial vessel and the power energy dissipation characteristics of the damper,a new type of anti-vibration device was proposed,and the power energy dissipation test results were compared with those of the traditional damper.The ANSYS model of the traditional damper is established,and the modal analysis of the traditional damper is carried out.The modal analysis results are compared with the test results of the traditional damper.Results show that the modal analysis results of ANSYS model are in good agreement with those obtained in the traditional damper test.The experimental energy dissipation power performance of the new vibration absorber at low frequency is better than that of the traditional damper.It is found that the energy dissipation response of the new vibration absorber is more effective in the low-order frequency resonance region,while the energy dissipation response of the new vibration absorber is reduced in the high-order frequency resonance region,because the spring of the new vibration absorber reduces the vibration coupling performance in the high-order frequency resonance region.(4)According to the structural characteristics of traditional anti-vibration hammer,the power dissipation impedance matrix is derived.The MATLAB finite element model was established to verify the test results.According to the structural characteristics of the new vibration absorber,the power dissipation impedance matrix is derived.The MATLAB finite element model was established to verify the test results.In addition,the influence of the parameters of the inertial vessel on the power and energy consumption of the new anti-vibration hammer is analyzed according to the established finite element model.The results show that the finite element model of the traditional damper is in good agreement with the experimental results,and the finite element model of the new antivibration device is in good agreement with the experimental results.Due to the variation of the structural parameters of the habitual vessel,the new vibration absorber has the characteristics of increasing the energy dissipation power of low order frequency and broadening the energy dissipation spectrum.Based on TMDI theory and anti-vibration hammer theory,this paper presents a new type of anti-vibration device to control the breeze vibration of transmission lines.The results of experiment,theory and numerical analysis on the power dissipation of the structure are helpful to understand the energy dissipation characteristics of the structure and the mechanism of broadening the energy dissipation spectrum.In particular,the combination of TMDI theory and the traditional FR-3 vibration damper can effectively reduce the vibration control of the transmission line,reduce the quality of the vibration damper,improve the low-order frequency energy dissipation characteristics,and achieve the integration of light weight,vibration damping and efficiency of the vibration damper.