Design And Performance Of Single-ended Magnetorheological Damper With Gas Compensation

Magnetorheological damper as an energy dissipation element has characterssuch as fast response, continuous adjustability, and good controllability, whichmake it be widely concerned. It was used in civil Earthquake, mechanicalvibration control and even military fields more and more. In the field ofmechanical engineering double-ended magnetorheological damper existslimitations of stroke and installation space, limited its use from a certain extent.In this case, we need to use a single-ended magnetorheological damper. However,related researchs around the world is scarce at current. In view of this, this papermainly consists the research of the design of a single-ended magneto-rheologicaldamper with gas compensation, performance analysis, hysteresis betweendamping force and speed, parametric modeling and non-parametric modeling.Firstly, it is concluded from analysis that nitrogen is more suitable becompensation mechanism than spring and rubber. Deduced the damping forcecalculation formula of single-ended magnetorheological damper with gascompensation, the formula shows that the damping force of magnetorheologicaldamper with gas compensation has one more elastic force than the double-endenvalve one. So the design of the piston rod and magnetic circui can be directlyreferenced from the parameters of double-ended magnetorheological damper. Thedesign of the initial pressure, volume and height, stiffness and frequency of thenitrogen compensation mechanism was carried out. The results showed thatfrequency and stiffness of nitrogen chamber varies with travel, there will not beany negative influence of the resonance effect.Secondly, systematic test to the designed damper has been carried out.Based on the test results through the analysis and research, the trends and lawsof various factors affecting the performance of damper are obtained. The innermechanism of the produce of the hysteresis loop has been revealed; the intrinsicfactor and influence law that determine the shape change of hysteresis loop hasbeen found; calculation formula of width of hysteresis loop has been deduced.Then, parametric and non-parametric modeling for the magnetorheologicaldamper.has been done. Due to the current parametric model is difficult todescribe the designed magnetorheological damper. A new model was proposedand used to modeling. The results show that the new parametric model ca n meetnonlinear characteristics the designed magnetorheological damper with highprecision. a non-parametric neural network model and neural network inverse model was established by neural network. Results showed that the well trainedneural network can describe the Nonlinear characteristics of magneto-rheologicaldamper description with a high precision, and it is a lot easier for reversemodeling using neural network than using parametric model.