Browse Publications Technical Papers 2004-01-0787

Topology Optimization of Solid-Compliant Torsional Spring: Maximization of Energy Dissipation for Reduction of Power Train Vibration 2004-01-0787

The topology optimization(1) made a great success in pure structural design in various industrial fields: Automobile, Air Craft, Military Vehicle and so on which made structure stiffer or increase of fundamental mode on the basis of limited resource or amount of materials. However, the optimization has been highly oriented in the filed of linear system and single objective function in itself though, in reality, it is necessary to introduce multi-disciplinary optimization due to higher needs of customers and better performance. However, since various factors interact each other in actual engineering fields in highly complicated manner, to the best of author's knowledge, it has not been achieved successfully so far. Furthermore, since it is likely that most of decision-makings have been made by management based on subjective knowledge and experience, it is not guaranteed that the system configuration or specific design have achieved most appropriate factors or global optimum in principle.
It is time to expand optimization technique to multi-disciplinary optimization to come up with more accurate decision-making. Nowadays, as the technology standard of most auto makers reach nearly same standard through worldwide and customer need higher comfort, Noise, Vibration and Harshness - NVH - become one of the most important factors to catalyze customer to purchase new vehicle with crashworthiness; it is less likely that conventional performances like engine horse power still essential in marketing. The most fundamental source of vibration in excitation of the whole vehicle is, needless to say that, the sequence of engine firing. Especially, in Korea, Japan and Europe where gasoline price is fairly higher than that of the United States, people prefer vehicle with smaller displacement engine.
In this dissertation, the power train excitation is regarded as the most crucial source of vibration and transferred to transmission through damper spring for the reduction of shock for ride and NVH. However, the damper spring dissipate energy through only axial deformation which constrained other possibilities to improve energy dissipation performance. The solid material with compliant system is come up with to achieve better way to dissipate energy with six degree of freedom more for NVH and light-weight design based on spatial constraints.
Based on stress-strain characteristic curve, the optimal material can be distributed throughout design domain and decided among commercial material through parametric study and analytical math and CAE model. The optimal topology can be achieved through mesh updating based on homogenization design method. Finally, the optimal topology is verified through LS-DYNA3D.


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