Active load path adaption in a simple kinematic load-bearing structure due to stiffness change in the structure's supports

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Gehb, C.M.^1 ; Platz, R.^2 ; Melz, T.^1

System Reliability and Machine Acoustics SzM, Technische Universität Darmstadt, Magdalenenstrasse 4, Darmstadt

D-64289, Germany^1

Fraunhofer Institute for Structural Durability and System Reliability LBF, Bartningstrasse 47, Darmstadt

D-64289, Germany^2

关键词: Active adjustments;    Additional forces;    Engineering applications;    Load-bearing systems;    Loadbearing structure;    Relative movement;    Stiffness characteristics;    Structural support;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012168/pdf
DOI  :  10.1088/1742-6596/744/1/012168

来源: IOP

【 摘 要 】

Load-bearing structures with kinematic functions enable and disable degrees of freedom and are part of many mechanical engineering applications. The relative movement between a wheel and the body of a car or a landing gear and an aircraft fuselage are examples for load-bearing systems with defined kinematics. In most cases, the load is transmitted through a predetermined load path to the structural support interfaces. However, unexpected load peaks or varying health condition of the system's supports, which means for example varying damping and stiffness characteristics, may require an active adjustment of the load path. However, load paths transmitted through damaged or weakened supports can be the reason for reduced comfort or even failure. In this paper a simplified 2D two mass oscillator with two supports is used to numerically investigate the potential of controlled adaptive auxiliary kinematic guidance elements in a load-bearing structure to adapt the load path depending on the stiffness change, representing damage of the supports. The aim is to provide additional forces in the auxiliary kinematic guidance elements for two reasons. On the one hand, one of the two supports that may become weaker through stiffness change will be relieved from higher loading. On the other hand, tilting due to different compliance in the supports will be minimized. Therefore, shifting load between the supports during operation could be an effective option.