Research On Dynamics Of Aero-engine Electronic Controller

Aero-engine electronic controller is the core component of the engine,and it directly determinesthe reliability of the engine as well as the reliability of the aircraft. As an airborne electronicequipment, it need to withstand various vibration and shock loadings in the work process. It will bevery likely to fail and lead to a serious flight accident if its structure design is irrational. So it isnecessary to take out dynamic analysis of it. Finite element method provides a convenient andeffective way for the dynamic analysis of the electronic controller and the premise is to establishreasonable finite element model.In this paper,test data was used to update the PCB FEM and anti-vibration design method of the PCBwas studied on the basis of simulation.The main work and contributions of the paper are as follows:1. Modeling strategy and simplified modelling method of PCB were studied in this paper. Inorder to reduce the size of the model and ensure the accuracy of the simulation, the module board FEmodel was established using shell elements. The connection between components and module boardand the constraint of the installation were also established.2. Finished the modal test of the module boards using SLDV. Reasonable excitation method andresponse measuring method were determined for the structural characteristics of the module boards.Special analysis was carried out to assess the influence of transducer mass-loading effects to testresults. Modal test results provided reliable basis for model updating.3. Modified the parameters of the module board FE models using model updating method. ThePCB material parameter, components and installation boundary constraint parameters were obtainedusing the measured modal parameters.4. The anti-vibration design method of electronic equipment was studied and the anti-vibrationdesign of the module board was carried out. In this work, the response of the module board under agiven loading spectrum was calculated to disclose disadvantages of original design, which wereimproved through anti-vibration design and the effects of the improved design were verified bysimulation.