Development Of Vibration Simulation Platform For Landing Gear Based On MR Damper

Damper puts an important roles in the buffer system of aircraft landing gear. Its performance is directly related to the quality control and control method, which can provide adjustable damping force and have the performance of semi-active control. With all of the points, the MR damper has a vast prospect in the field of aircraft landing gear application.If this new type of damper want to be applied into aircraft landing gear, it needs a large number of qualified performance and vibration tests, which cost a lot of time and money, and have terrible effect on the aircraft designing & manufacturing cycle. In the view of this situation, the project considers to establish a vibration simulation platform, suiting for MR damping gear, which could simulate the performance test of damper, the taxiing vibration test of landing gear and its drop vibration test. The new simulation platform is able to shorten development cycle of the aircraft machine and its landing gear, and to reduce the cost for researching a new type of damper.With the operating mode and dynamics model of damper, this paper uses the dynamic simulation software ADAMS to take on vibration simulation of MR damping gear, and establishes dynamics equations applying to MR damper. Data, what is experimented by predecessors, collection is used to carried out parameters analysis in the three aspects of damper magnetic structure design, oil & gas chambers structure design and vibration test conditions. Thereby, the main factors that make a significant difference on damper property and test conditions are determined.By analyzing design requirements of the simulation platform, the menus and interface for platform operating are customized in the environment of Visual Studio. The platform is divided into four modules, which includes inputting & saving parameters, performance testing of the damper, drop vibration testing and taxiing vibration testing, among which the parameters inputting module also includes two parts of magnetic structure design parameters and oil & gas chambers structure design parameters. The inputting parameters are not the same when the structure type are different. After selecting the corresponding conditions of the structure type, the appropriate parameters need to be entered and the simulation test is taken on under the specified test conditions. Finally, the simulation curves are drawn on the outputinterface. Simultaneously, the data calculated by simulation model can be stored into or called from ACCESS database, which is connected to the platform, with the data collected and collated from experiments. It indicates that the simulation results whether meets the requirements or not by means of comparative analysis with the experimental data which is under the same test conditions.The project takes on the damping characteristics experiments with the material MR damper designed by team members, and stores the experimental data, under all kinds of excitation conditions into the specified location of database, after jointly dealing with the previous drop experimental data. It makes the simulation results closer to experimental ones,which will improve reasonableness and accuracy of the simulation platform, by using the comparative analysis between simulations and experimental results to calibrate self-established simulation model. In the end of the paper, the characteristics and shortcomings, according to the established simulation platform and the related research work,are summarized, which propose some constructive opinions on simulation study of the MR damper.