Study Of Energy Dissipation Performance Of The Self Feedback Controlled Friction Damper

Vibration phenomenon is inevitable in whether mechanical equipment or buildingstructure. Severe vibration can cause performance degradation even damage the mechanicalstructure, which can cause significant and irreparable damage. In order to control the vibration,energy damping device is usually installed in mechanical equipment or building structure toabsorb the vibration energy. In preliminary study, a self-feedback control friction damper isdesigned according to coulomb friction theory and control theory. The new dampers canadjust damping force automatically according to the amplitude. It can play a better role inenergy dissipation. Stiffness and strength of the key components is analyzed and itsmechanism of energy dissipation is described in the previous study. However, this kind ofdamper will generate heat in the actual work process. Heat accumulating in the damper makessome parameters of the damper change. The energy dissipation of damper becomes unstable.Temperature impacts the most critical factors, which is the initial pressure of dampers, mostprominently. But this factor is not fully considered in previous study. Therefore, this paperfocuses on the analysis of temperature rising phenomenon and its impact on the energydissipation performance. On this basis, the existing damper is improved further. Anadjustment device is added to eliminate the impact of temperature rising on energy dissipationperformance. The research work in the paper lays the structural foundation for this kind ofdampers in the usage of active control. Contents of this paper are as follows.First, analysis of damper structure improvement and energy dissipation mechanism baseson temperature effect are studied in this paper. Theoretical formula of damping force has beengot in the preliminary studies. Matlab program is written according to the theoretical formulato study effect of external load (load amplitude and frequency) on energy dissipationperformance of the damper. The hysteresis curve under different loading conditions areanalyzed and compared in the paper.Second, the impact of temperature on energy dissipation performance of the damper isstudied in the paper. Temperature rising mechanism and its impact on pressurized gaschamber pressure is analyzed. And the theoretical calculation formula of the relationshipbetween the temperature and the fluid pressure is deduced. According to the heat balance equation, this paper analyzes energy dissipation performance of the damper at its steady state,calculates the damper heat generating power and variety of heat dissipation power. Theequilibrium temperature and its impact factors are analyzed. The damper’s hystereticbehaviors at different temperatures are found out also.Third, this paper analyzes energy dissipation performance by the finite element analysis.Fluid and pressurized air chamber system is analyzed to obtain internal fluid pressure of thedamper. The result provides the boundary conditions for subsequent fluid-structure thermallycoupling analysis. The output of oil pressure is taken as boundary conditions to analyze theeffect of temperature changing on the energy performance of the damper.Fourth, this paper analyzes energy dissipation performance of the damper by simulationtest. An orthogonal table for factors which affects energy dissipation performance is designedfirstly. The various factors’ significant difference is analyzed by method of orthogonal test.The effect trend of most significant factors is also analyzed using the single factor test, whichcould help to provide the basis for future parameter optimization.