Multi-domain unified modeling and simulation of semi-active suspension in magnerorheological damper
In order to build high-precision and highefficient MR damper system model, a multi-domain unified modeling method was proposed. Firstly, based on the analysis of a MR damper semi-active suspension system model, various fields of MR, such as structure, magnetic field, control and mechanics, were studied to find the main influencing parameters. And then for the multi-domain coupling characteristics of MR damper, a multi-domain unified modeling of MR damper system was established based on Modelica/MWorks platform. By adjusting the main influencing parameters, the relationship diagrams between the parameters and the performances were obtained. Finally, some performance results were compared with the traditional method used Matlab/simulink modeling and the method proposed. The results show that the model based on Modelica can preferably reflect the complex relationship between the MR damper coupling among the parameters within the system, and can get a better simulation result.
Modelling and Testing of Magnetorheological Damper
The working principle of a flow pattern magnetorheological(MR) damper is introduced. The fluid dynamic analysis is done based on Bingham plastic model and fluid motion differential equation, and then the mathematical model of MR damper is established. The charts of damping-displacement characteristic and damping-velocity characteristic are obtained during the experiment. The model coefficients are identified based on test results, and then the simplified mechanical model is established. Results show that the applied current has direct relation with MR Damper performance but it gives best results when applied current is less than 0.8 A. The difference between damping force experimental values and the calculated value is observed about 100 N, and the difference of 19% is observed. The simplified mechanical model can describe the basic mechanical properties of the MR damper.
Phenomenology and homeopathy.
There is a great overlap between the way of seeing the world in clinical homeopathy and in the technical philosophical system known as phenomenology. A knowledge of phenomenologic principles reveals Hahnemann to have been an unwitting phenomenologist. The ideas of phenomenology as applied to medicine show that homeopathy is the ideal medical system to fulfill the goals of coming ever closer to true patient concerns and experience of illness.